00:00:06.450 all right 00:00:15.87000:00:15.880 all right we're going to go through some 00:00:17.13000:00:17.140 definitions first and go through the gas 00:00:19.89000:00:19.900 laws and then we will get into the basic 00:00:23.33900:00:23.349 refrigeration cycle and we'll see how 00:00:26.90900:00:26.919 that all relates I know modules 1 & 2 00:00:29.19000:00:29.200 are tough a lot of formulas a lot of 00:00:31.56000:00:31.570 talk about how many BTUs does it take to 00:00:35.43000:00:35.440 take a 10 pound block of ice at -10 00:00:37.95000:00:37.960 degrees and make it into 250 degrees 00:00:40.56000:00:40.570 steam but that's all for purpose we'll 00:00:43.07900:00:43.089 kind of get into that in just a bit 00:00:44.50900:00:44.519 okay the first definition heat now when 00:00:48.84000:00:48.850 you think of heat as a human being that 00:00:52.17000:00:52.180 is like your stove and it's hot and you 00:00:53.85000:00:53.860 get burnt but truly heat is just a form 00:00:56.54900:00:56.559 of energy and it's molecules in motion 00:00:58.26000:00:58.270 so even with an ice cube that's at 32 00:01:01.08000:01:01.090 degrees there are molecules in that ice 00:01:03.47900:01:03.489 that are moving and they're still heat 00:01:05.34000:01:05.350 there isn't until you get down to minus 00:01:09.12000:01:09.130 460 degrees and all molecular motion 00:01:11.76000:01:11.770 stops and that's never been reached yet 00:01:14.10000:01:14.110 that you can get down pretty close to 00:01:15.74900:01:15.759 that but so I want you to start thinking 00:01:18.48000:01:18.490 of heat as molecules in motion not so 00:01:22.02000:01:22.030 much as something that is hot to your 00:01:25.02000:01:25.030 touch and heat always flows from a 00:01:27.69000:01:27.700 substance that has more heat or more 00:01:29.78900:01:29.799 molecules and motions to one with less 00:01:31.98000:01:31.990 heat 00:01:34.64000:01:34.650 this will give you a quick example right 00:01:37.32000:01:37.330 here 00:01:41.21900:01:41.229 for example this block of ice at 32° 00:01:43.62000:01:43.630 does have molecules in motion but 00:01:45.78000:01:45.790 they're pretty much bonded together and 00:01:47.42900:01:47.439 they're not moving very much they're 00:01:49.08000:01:49.090 just sitting here pretty while they are 00:01:51.99000:01:52.000 moving they are not bouncing into each 00:01:54.66000:01:54.670 other too much are more or less bound 00:01:56.37000:01:56.380 together and that's why we that gives 00:01:58.59000:01:58.600 ice it's solid form and as we start to 00:02:01.88900:02:01.899 add heat to the the ice and it begins to 00:02:05.19000:02:05.200 melt those molecules begin to move a 00:02:07.62000:02:07.630 little bit faster so not only are they 00:02:09.27000:02:09.280 bound together they they start to cut 00:02:12.30000:02:12.310 loose their binds with each other and 00:02:15.02000:02:15.030 turn into a liquid and they start to 00:02:17.40000:02:17.410 exert some force in the downwards and 00:02:20.78900:02:20.799 outwards direction like in this 00:02:22.35000:02:22.360 container then as we add more and heat 00:02:25.11000:02:25.120 and we turn this water and liquid into 00:02:29.13000:02:29.140 vapour those molecules are bouncing 00:02:32.03900:02:32.049 around really fast and it exerts 00:02:34.80000:02:34.810 pressure in all directions and 00:02:38.32000:02:38.330 and that's the one thing you need to 00:02:39.91000:02:39.920 remember when we're talking about 00:02:41.41000:02:41.420 pressure that's where you get pressure 00:02:43.24000:02:43.250 that this example here that shows that 00:02:45.76000:02:45.770 blows the cork off the bottom you get so 00:02:47.62000:02:47.630 much energy and pressure in here that in 00:02:51.12000:02:51.130 the form of heat 00:02:59.40000:02:59.410 you 00:03:02.53000:03:02.540 okay heat flow 00:03:05.68000:03:05.690 when I talked about Heat earliest 00:03:08.35000:03:08.360 molecules in motion so this makes sense 00:03:11.34000:03:11.350 to us if we have a hundred degree 00:03:14.05000:03:14.060 fahrenheit block of lead here and set it 00:03:17.29000:03:17.300 next to a 75 degree Fahrenheit block of 00:03:20.62000:03:20.630 lead of course we we recognize that the 00:03:23.56000:03:23.570 heat will flow from the substance with 00:03:25.90000:03:25.910 more heat or molecules of motion to one 00:03:27.88000:03:27.890 with less but now we we don't usually 00:03:30.31000:03:30.320 think of minus 200 degree Fahrenheit and 00:03:33.28000:03:33.290 minus 350 degree Fahrenheit as having 00:03:36.01000:03:36.020 heat but it still does it has molecules 00:03:38.41000:03:38.420 in motion although not as much as these 00:03:40.81000:03:40.820 blocks up here they're armed there is 00:03:43.81000:03:43.820 heat energy contained in this block of 00:03:47.47000:03:47.480 lead and the molecular motion or heat 00:03:50.59000:03:50.600 energy will in fact flow from a 00:03:53.43000:03:53.440 substance that is minus 200 degrees to 00:03:56.41000:03:56.420 minus 350 degrees Fahrenheit and that's 00:03:59.08000:03:59.090 why I want you to think about heat again 00:04:00.82000:04:00.830 as molecules of motion not something 00:04:03.22000:04:03.230 that is hot or cold to the to our touch 00:04:12.08900:04:12.099 alright there's in air conditioning we 00:04:16.19900:04:16.209 have two forms of the types of heat that 00:04:18.65900:04:18.669 we like to talk about one is sensible 00:04:21.09000:04:21.10000:04:23.21000:04:23.220 and that is where if you add heat or 00:04:28.01000:04:28.020 molecules or heat energy in molecules in 00:04:31.16000:04:31.170 motion as to a substance it changes the 00:04:35.03000:04:35.040 temperature that you can measure with a 00:04:36.65000:04:36.660 thermometer and then we have latent heat 00:04:39.47000:04:39.480 and that latent means hidden and that's 00:04:42.23000:04:42.240 heat that cannot be measured by a 00:04:46.37000:04:46.380 thermometer and what it does is at a 00:04:49.46000:04:49.470 certain point and if we use water in the 00:04:51.77000:04:51.780 example in the textbook when you start 00:04:55.43000:04:55.440 with a 75 degree pan of water and put it 00:04:59.15000:04:59.160 on the 500 degrees stove it starts to 00:05:01.91000:05:01.920 increase the temperature and if you have 00:05:03.41000:05:03.420 a thermometer in there it's going to 00:05:05.51000:05:05.520 show that temperature increase that's 00:05:07.52000:05:07.530 the sensible heat at a certain point at 00:05:11.21000:05:11.220 if you're at sea level it's 212 degrees 00:05:13.52000:05:13.530 the water begins to boil and and that's 00:05:18.26000:05:18.270 changing of state from a liquid to vapor 00:05:20.84000:05:20.850 and it remains steady at 212 degrees and 00:05:25.28000:05:25.290 will not that water does not increase 00:05:27.68000:05:27.690 temperature because all of that heat 00:05:30.08000:05:30.090 energy that's being absorbed is changing 00:05:33.17000:05:33.180 the state of the water from liquid to 00:05:34.85000:05:34.860 vapor 00:05:35.33000:05:35.340 that's called latent heat because even 00:05:38.15000:05:38.160 though you're adding heat you can't 00:05:39.46900:05:39.479 measure with your thermometer 00:05:47.76000:05:47.770 okay saturation 00:05:51.50000:05:51.510 we'll talk about water first then we're 00:05:54.35000:05:54.360 going to talk about refrigerants because 00:05:55.73000:05:55.740 it's some they're very similar in their 00:05:57.50000:05:57.510 properties the saturation is when a 00:06:00.95000:06:00.960 substance is in the form of both liquid 00:06:03.71000:06:03.720 and vapor 00:06:07.90000:06:07.910 and if heat is added 00:06:11.77000:06:11.780 you'll begin to change state into vapor 00:06:14.50000:06:14.510 and if heat is removed 00:06:18.80000:06:18.810 it will change state back into liquid so 00:06:21.68000:06:21.690 the definition of saturation is when a 00:06:24.41000:06:24.42000:06:26.63000:06:26.640 and vapor when we add Heat 00:06:28.76000:06:28.770 it changes state begins to change state 00:06:31.40000:06:31.410 into vapor and when we remove heat it 00:06:34.34000:06:34.350 will begin to change state back into 00:06:36.14000:06:36.150 liquid 00:06:43.60000:06:43.610 and I just want to let everyone know if 00:06:45.39900:06:45.409 you do have audio problems please call 00:06:47.08000:06:47.090 in on the number up at top I just got a 00:06:49.36000:06:49.370 message 00:06:52.81000:06:52.820 from one of our viewers here 00:06:59.90900:06:59.919 okay changing state and this is very 00:07:03.11900:07:03.129 important when when we are changing 00:07:06.14900:07:06.159 state of a liquid to a vapor it takes a 00:07:10.01900:07:10.029 tremendous amount of heat energy and 00:07:12.83900:07:12.849 which is molecule which are molecules in 00:07:15.36000:07:15.370 motion to change that state from liquid 00:07:17.93900:07:17.949 to vapor and when that condenses back 00:07:19.92000:07:19.930 down from vapor to liquid all the energy 00:07:23.21900:07:23.229 the heat energy that's been absorbed is 00:07:25.73000:07:25.740 released so when you boil your water it 00:07:30.74900:07:30.759 all that heat energy when it hits your 00:07:32.76000:07:32.770 cool window and turns back into water 00:07:34.64900:07:34.659 releases all of that heat back into the 00:07:36.99000:07:37.000 atmosphere 00:07:41.22000:07:41.230 okay and from now on I want us to think 00:07:43.62000:07:43.630 about not to think about boiling anymore 00:07:46.17000:07:46.180 because that's just like heat for us 00:07:48.21000:07:48.220 boiling we equate to water and it's hot 00:07:50.25000:07:50.260 we want to think about changing state 00:07:54.69000:07:54.700 rather than boiling because it gets 00:07:57.69000:07:57.700 confusing with refrigerant again it 00:07:59.19000:07:59.200 makes sense when you have a beaker of 00:08:01.95000:08:01.960 water here and you're adding heat to it 00:08:03.81000:08:03.820 and it's boiling and you put your finger 00:08:05.46000:08:05.470 in there and you get burned but when we 00:08:09.93000:08:09.940 talk about refrigerate refrigerants they 00:08:12.00000:08:12.010 boil at much lower temperatures so we're 00:08:14.31000:08:14.320 going to we're going to erase boiling 00:08:16.08000:08:16.090 from our vocabulary and changing state 00:08:19.14000:08:19.150 is what we're going to talk about from 00:08:21.57000:08:21.580 here on out 00:08:30.64000:08:30.650 all right so here is the diagram from 00:08:33.32000:08:33.330 our textbook and it starts out at the 00:08:37.37000:08:37.380 bottom of the graph at with the zero 00:08:41.42000:08:41.430 Degree ice we're not going to worry 00:08:43.85000:08:43.860 about much about this zero Degree ice 00:08:46.55000:08:46.560 until we hit 32 degree water at this 00:08:50.51000:08:50.520 point right here let's talk about this 00:08:53.15000:08:53.160 water we have that water on the stove 00:08:55.01000:08:55.020 like we talked about earlier and as it 00:08:58.73000:08:58.740 is 00:09:00.60900:09:00.619 heated up on the stove the temperature 00:09:03.30900:09:03.319 begins to rise at this point we're at 00:09:05.51900:09:05.529 100 degrees over here now the as that 00:09:12.12900:09:12.139 heat that is being added raises the 00:09:13.92900:09:13.939 temperature that is the sensible heat 00:09:15.90900:09:15.919 remember sensible heat is heat they can 00:09:18.72900:09:18.739 be measured with a thermometer at 212 00:09:23.82900:09:23.839 degrees 00:09:26.54000:09:26.550 our water is that saturation is that a 00:09:29.63000:09:29.640 saturation point it is absorbed as much 00:09:32.23000:09:32.240 sensible heat as it can absorb and any 00:09:35.51000:09:35.520 heat that is added 00:09:40.39000:09:40.400 went on 00:09:42.51000:09:42.520 changes the state of the water from 00:09:45.95000:09:45.960 liquid to vapor and it doesn't matter 00:09:48.81000:09:48.820 how many how much heat we put on there 00:09:51.18000:09:51.190 as long as 00:09:53.84000:09:53.850 we have liquid in both liquid and vapor 00:09:56.09000:09:56.100 together it will absorb a tremendous 00:09:59.45000:09:59.460 amount of heat to change the state from 00:10:03.07000:10:03.080 liquid to vapor at a certain point when 00:10:06.74000:10:06.750 all of the liquid has been changed to 00:10:08.87000:10:08.880 vapor it will again start to pick up 00:10:10.96000:10:10.970 sensible heat here and it raises the 00:10:14.72000:10:14.730 temperature of the steam 00:10:17.16000:10:17.170 now once you take a look at this if we 00:10:19.67900:10:19.689 take 00:10:21.86000:10:21.870 32-degree water and we go back down here 00:10:24.29000:10:24.300 it is it is a hundred and sixty BTUs to 00:10:29.03000:10:29.040 get it to that point and then we raise 00:10:31.91000:10:31.920 the temperature to 212 degrees it only 00:10:36.62000:10:36.630 takes one hundred and eighty BTUs of 00:10:38.51000:10:38.520 heat to do that that's not a lot of 00:10:41.36000:10:41.370 energy in the form of molecules in 00:10:43.51900:10:43.529 motion so raising the temperature of 00:10:46.85000:10:46.860 something really doesn't absorb or 00:10:49.82000:10:49.830 release a lot of heat but when we hit 00:10:52.37000:10:52.380 this point right here where it's at its 00:10:54.07900:10:54.089 saturation point and we take that pan of 00:10:57.82900:10:57.839 water and we turn it from liquid into 00:11:00.32000:11:00.33000:11:00.80000:11:00.810 it takes 970 BTUs of latent heat to do 00:11:06.92000:11:06.930 that and this is with one pound of water 00:11:09.07000:11:09.080 so this is where the refrigeration 00:11:12.59000:11:12.600 process happens not with water but with 00:11:15.86000:11:15.870 refrigerant so I want you to remember 00:11:17.15000:11:17.160 that changing of state is requires a 00:11:21.44000:11:21.450 tremendous amount of heat in the form of 00:11:25.76000:11:25.770 molecules of motion and if we go 00:11:27.47000:11:27.480 backwards down this down this chart and 00:11:32.06000:11:32.070 we hit the saturation point where it is 00:11:35.11000:11:35.120 almost all steam and just starting to 00:11:38.09000:11:38.100 turn into liquid from vapor to liquid 00:11:40.04000:11:40.050 all of the heat that we gained as we 00:11:43.22000:11:43.230 travel back down from vapor to liquid 00:11:45.82000:11:45.830 that all that 970 BTUs is released from 00:11:50.66000:11:50.670 the water until it hits 211 degrees and 00:11:55.61000:11:55.620 then it's going to start losing its 00:11:57.65000:11:57.660 sensible heat again this is where the 00:11:59.93000:11:59.940 refrigeration process takes takes place 00:12:10.90000:12:10.910 all right superheat once that liquid and 00:12:16.27000:12:16.280 in this case water but refrigerant as 00:12:18.64000:12:18.650 well once that liquid has changed state 00:12:22.90000:12:22.910 completely in the vapor adding any more 00:12:25.03000:12:25.040 heat will increase the temperature now 00:12:31.02000:12:31.030 that's where we talked about right here 00:12:36.73000:12:36.740 we've changed we have changed the 00:12:42.85000:12:42.860 liquid-vapor combination into 100% vapor 00:12:46.60000:12:46.610 any heat that is added this is our super 00:12:49.69000:12:49.700 heat heat that is added is called super 00:12:52.69000:12:52.700 heat and this is where this happens so 00:12:55.48000:12:55.490 that is this part of the chart right 00:12:58.96000:12:58.970 here so when you think about super heat 00:13:02.56000:13:02.570 is heat that is added above the 00:13:06.37000:13:06.380 saturation point after it turns into 00:13:08.94900:13:08.959 100% vapor whether it be water or 00:13:13.13900:13:13.149 refrigerant 00:13:16.72000:13:16.730 so if you measure the temperature 00:13:20.75000:13:20.760 if you measure the temperature of your 00:13:22.42000:13:22.430 refrigerant or water 00:13:25.97000:13:25.980 and you subtract the saturation 00:13:28.06000:13:28.070 temperature from it what is remaining is 00:13:30.86000:13:30.870 the superheat and this is it this is 00:13:33.56000:13:33.570 when it's in the vapor form 00:13:40.43000:13:40.440 now this has a lot to do with 00:13:41.63000:13:41.640 refrigeration troubleshooting which 00:13:43.10000:13:43.110 we'll get into in another webinar but 00:13:46.40000:13:46.410 superheat and 00:13:49.61000:13:49.620 subcooling 00:13:53.96000:13:53.970 Orton so subcooling okay so once our 00:13:57.41000:13:57.420 vapors changed completely back into 00:14:00.31900:14:00.329 liquid or 100 percent liquid removing 00:14:03.76900:14:03.779 heat will decrease the temperature so 00:14:06.87900:14:06.889 we're removing sensible heat so if you 00:14:09.65000:14:09.660 take your saturation temperature and 00:14:11.32900:14:11.339 then you measure measure 00:14:15.44000:14:15.450 the temperature of the liquid the 00:14:18.17000:14:18.180 difference is sub cooling now on our 00:14:21.38000:14:21.390 chart 00:14:25.67000:14:25.680 that's what happens right down here so 00:14:28.45000:14:28.460 here we're at saturation point we're 00:14:30.95000:14:30.960 dumping all of the latent heat latent 00:14:33.17000:14:33.180 heat latent heat latent heat at this 00:14:35.30000:14:35.310 point from here 00:14:38.26000:14:38.270 from here downwards 00:14:42.23000:14:42.240 is our is our subcooling so 00:14:46.89000:14:46.900 we'll get into this again in more detail 00:14:48.75000:14:48.760 but they're actually the entire 00:14:51.30000:14:51.310 refrigeration cycle happens between sub 00:14:54.87000:14:54.880 cooled liquid through the saturation 00:14:57.39000:14:57.400 point up to superheated vapor and then 00:15:00.78000:15:00.790 back down again 00:15:01.92000:15:01.930 down to this chart and we'll get into 00:15:03.96000:15:03.970 the refrigeration cycle we will 00:15:07.52000:15:07.530 we will explore this chart a little bit 00:15:09.74000:15:09.750 further 00:15:14.26000:15:14.270 okay gas laws I know they had Boyle's 00:15:16.96000:15:16.970 law dalton's law the law of combined gas 00:15:19.94900:15:19.959 what you really need to know is if you 00:15:22.51000:15:22.520 compress a gas and reduce its volume 00:15:25.50000:15:25.510 both the temperature 00:15:29.02000:15:29.030 and pressure will increase so if you if 00:15:31.12000:15:31.130 you have a piston then you put air in 00:15:33.55000:15:33.560 that piston and you compress that piston 00:15:35.64000:15:35.650 you think about it heat is more heat and 00:15:38.44000:15:38.450 pressure are molecules in motions so if 00:15:40.69000:15:40.700 you reduce the amount of space those 00:15:42.19000:15:42.200 molecules have to bounce around that 00:15:45.01000:15:45.020 heat is increased and so is the 00:15:46.54000:15:46.550 temperature and conversely if you expand 00:15:48.91000:15:48.920 that gas and put and pull that piston 00:15:51.70000:15:51.710 back down both the temperature and the 00:15:54.58000:15:54.590 pressure will decrease because those 00:15:56.17000:15:56.180 molecules that are in motion aren't 00:15:58.83000:15:58.840 don't bounce as fast and and against 00:16:03.55000:16:03.560 each other to create that heat and 00:16:05.14000:16:05.150 pressure so that's the one thing you 00:16:06.88000:16:06.890 need to remember with with the gas law 00:16:10.21000:16:10.220 if you increase pressure you increase 00:16:13.42000:16:13.430 temperature if you increase temperature 00:16:14.98000:16:14.990 you increase pressure as well and the 00:16:18.58000:16:18.590 same thing if you decrease the pressure 00:16:21.70000:16:21.710 you decrease the temperature that they 00:16:24.58000:16:24.590 happen together 00:16:31.97000:16:31.98000:16:33.87000:16:33.880 okay and here's an example of that so 00:16:37.35000:16:37.360 here's our piston and we fill this 00:16:39.71000:16:39.720 piston with air and it's at atmospheric 00:16:43.55900:16:43.569 pressure which is 14 point 7 psi and we 00:16:47.81900:16:47.829 reduce this piston by half the size we 00:16:51.74900:16:51.759 compress this gas and we reduce the 00:16:54.44900:16:54.459 volume in half it doubles the pressure 00:16:56.93900:16:56.949 it's also going to increase the heat 00:17:00.96000:17:00.970 because these molecules are bouncing 00:17:02.79000:17:02.800 around in here at whatever rate they are 00:17:07.07900:17:07.089 but if we decrease the area and the 00:17:10.43900:17:10.449 volume of where these molecules bounce 00:17:12.84000:17:12.850 around they bounce around faster and 00:17:14.97000:17:14.980 when they bounce around faster that 00:17:16.74000:17:16.750 remember heat is our molecules in motion 00:17:18.77900:17:18.789 the more motion the more heat that's 00:17:20.76000:17:20.770 generated 00:17:27.25000:17:27.260 okay and this is just an illustration 00:17:29.28900:17:29.299 here of 00:17:32.53000:17:32.540 a bottle of liquid that's at its 00:17:35.44000:17:35.450 saturation point as refrigerant at 75 00:17:39.22000:17:39.230 degrees it's 132 psi and if we reduce 00:17:43.24000:17:43.250 the temperature 00:17:46.15000:17:46.160 it reduces the pressure as well and if 00:17:49.69000:17:49.700 we have this jug over here and we read 00:17:52.42000:17:52.430 we vent off some of this pressure it's 00:17:55.69000:17:55.700 and decrease the pressure is also going 00:17:58.45000:17:58.460 to decrease the temperature 00:18:01.60000:18:01.610 so remember pressure increase 00:18:03.43000:18:03.440 temperature increase 00:18:05.81000:18:05.820 pressure decrease temperature decrease 00:18:09.56000:18:09.570 make sense all right 00:18:16.46000:18:16.470 now we're still again talking about 00:18:19.10000:18:19.110 water the changing of state of water at 00:18:24.11000:18:24.120 atmospheric pressure happens at 212 00:18:27.98000:18:27.990 degrees Fahrenheit 00:18:34.77000:18:34.780 and we can see that right here this is a 00:18:38.04000:18:38.050 pressure temperature chart for water 00:18:42.77000:18:42.780 and the way 00:18:47.89000:18:47.900 when we're looking at any type of 00:18:49.09000:18:49.100 pressure 00:18:49.62900:18:49.639 temperature chart this is talking about 00:18:53.03900:18:53.049 saturation 00:18:56.97000:18:56.980 temperatures and pressures that's when 00:18:59.10000:18:59.110 we are both liquid and vapor 00:19:01.99000:19:02.000 and if we add any heat it's going to 00:19:04.54000:19:04.550 change state from liquid to vapor and if 00:19:07.27000:19:07.280 we remove heat is going to change state 00:19:09.04000:19:09.050 from vapor to liquid once we're 100% 00:19:11.44000:19:11.450 liquid or 100% vapor this chart right 00:19:14.32000:19:14.330 here has no bearing whatsoever on what's 00:19:17.92000:19:17.930 going on so there are this is a pressure 00:19:20.94000:19:20.950 temperature chart or Pt chart for water 00:19:23.62000:19:23.630 and we we have these charts for 00:19:27.37000:19:27.380 refrigerant as well but let's look at 00:19:29.71000:19:29.720 this this is atmospheric pressure down 00:19:31.90000:19:31.910 here at the bottom 14.7 PSI and 00:19:40.73000:19:40.740 at four at atmospheric pressure water 00:19:43.85000:19:43.860 will change state at 212 degrees now 00:19:47.21000:19:47.220 let's say we reduce that atmospheric 00:19:50.81000:19:50.820 pressure and we put the water into 00:19:55.12900:19:55.139 somewhat of a vacuum we can change the 00:19:57.59000:19:57.600 state of that water at 70 degrees 00:20:00.12900:20:00.139 Fahrenheit 00:20:03.04900:20:03.059 and the same thing happens if you 00:20:04.90900:20:04.919 increase the pressure and it increases 00:20:08.98900:20:08.999 the temperature that the water changes 00:20:10.66900:20:10.679 State and we'll get into this again when 00:20:12.71000:20:12.720 we get in the refrigeration cycle this 00:20:14.21000:20:14.220 will start to make some more sense 00:20:19.51000:20:19.520 so at 5115 psi and a pressure cooker 00:20:23.98000:20:23.990 water doesn't change state until you 00:20:26.47000:20:26.480 till it hits the 250 degree fahrenheit 00:20:30.42000:20:30.430 range and that's when I hit saturation 00:20:33.49000:20:33.500 where it's both liquid and vapor present 00:20:35.68000:20:35.690 and if we add Heat it's going to change 00:20:39.37000:20:39.380 state from liquid to vapor and if we 00:20:42.22000:20:42.230 remove heat it's going to change state 00:20:44.08000:20:44.090 from vapor to liquid 00:20:52.50000:20:52.51000:20:55.09000:20:55.100 okay and this is just an example if we 00:20:57.39900:20:57.409 have a bell jar and week and we have a 00:21:00.27900:21:00.289 vacuum pumping and back it out we can 00:21:03.43000:21:03.440 make water change state at 70 degrees 00:21:06.82000:21:06.83000:21:09.40900:21:09.419 all right so let's get into the basic 00:21:10.84900:21:10.859 refrigeration cycle step by step we're 00:21:12.64900:21:12.659 going to go we'll talk about saturation 00:21:14.94900:21:14.959 superheat sub cooling changing of state 00:21:17.83900:21:17.849 and energy that's required to do this 00:21:20.82900:21:20.839 the refrigeration process as we go along 00:21:25.12900:21:25.13900:21:27.78000:21:27.790 all right so let me clarify some things 00:21:29.70000:21:29.710 here to make a little bit more sense 00:21:31.40000:21:31.410 this 00:21:34.94000:21:34.950 signifies the wall in your home 00:21:39.76000:21:39.770 the wall is the indoor unit this is the 00:21:42.01000:21:42.020 blower where you change your filter 00:21:43.42000:21:43.430 here's our fan 00:21:45.99000:21:46.000 here's our cooling coil or evaporator 00:21:49.25900:21:49.269 coil right here 00:21:53.22000:21:53.230 these are the lines that connect the 00:21:55.35000:21:55.360 copper lines that connect the indoor 00:21:57.81000:21:57.820 unit now yours may be in a closet in an 00:22:00.29900:22:00.309 attic or garage crawlspace wherever it 00:22:02.39900:22:02.409 may be this this part is the indoor unit 00:22:10.23000:22:10.240 our copper lines they pass through the 00:22:12.60000:22:12.610 wall they go out to the outdoor unit 00:22:14.37000:22:14.380 which is the condenser and this is what 00:22:17.19000:22:17.200 sets outside your home here's the 00:22:19.23000:22:19.240 condenser fan 00:22:21.22000:22:21.230 here's the condenser coil everything 00:22:23.80000:22:23.810 else has been removed from this diagram 00:22:25.51000:22:25.520 to help us get a better idea of the 00:22:28.93000:22:28.940 refrigeration cycle 00:22:33.03900:22:33.049 our textbook starts the refrigeration 00:22:35.22900:22:35.239 cycle at the compressor I like to start 00:22:39.24900:22:39.259 it here at the metering device and right 00:22:42.22000:22:42.230 at the beginning of the metering device 00:22:43.95000:22:43.960 we're going to start so we will start 00:22:49.18000:22:49.190 and we'll get back to this point and 00:22:50.91900:22:50.929 we'll end up right here we are going to 00:22:52.98900:22:52.999 start with 100% liquid refrigerant 00:22:56.75900:22:56.769 entering the metering device and for the 00:22:59.97900:22:59.989 sake of this webinar we are going to 00:23:05.09900:23:05.109 just take a look think about our our 00:23:08.22900:23:08.239 metering device 00:23:10.82000:23:10.830 as 00:23:15.00000:23:15.010 a restriction in the in our line right 00:23:18.48000:23:18.490 here and what it does is it will 00:23:21.44000:23:21.450 whatever type of muting device it may be 00:23:24.59000:23:24.600 it will reduce the pressure 00:23:29.48000:23:29.490 as a refrigerant moves through the 00:23:32.51000:23:32.52000:23:33.44000:23:33.450 now the 00:23:37.32000:23:37.330 our gas laws tell us when we reduce 00:23:39.74900:23:39.759 pressure we also reduce temperature so 00:23:43.49900:23:43.509 at this point in the refrigeration 00:23:47.58000:23:47.590 process after the liquid refrigerant has 00:23:50.22000:23:50.230 passed through the metering device the 00:23:54.26900:23:54.279 refrigerant itself is 25 percent vapor 00:23:57.77900:23:57.789 and 75 percent liquid and remember that 00:24:02.94000:24:02.950 puts it right from liquid directly into 00:24:05.70000:24:05.710 the saturation point because saturation 00:24:07.97900:24:07.989 is when we have both liquid and vapor 00:24:10.39900:24:10.409 present so we now have saturated 00:24:13.48900:24:13.499 refrigerant at our indoor coil 00:24:19.06000:24:19.070 and 00:24:21.23000:24:21.240 we are we have our indoor fan that is 00:24:23.99000:24:24.000 blowing 75 degree room air 00:24:28.48000:24:28.490 across our evaporator coil with our 00:24:32.62000:24:32.630 saturated refrigerant in there and 00:24:34.66000:24:34.670 remember when refrigerant or anything 00:24:37.63000:24:37.640 else is at its saturation point if you 00:24:39.37000:24:39.380 add 00:24:41.81000:24:41.820 kind of heat it's going to change the 00:24:43.76000:24:43.770 state of the refrigerant so it's going 00:24:46.25000:24:46.260 to start it's already 75 percent liquid 00:24:48.35000:24:48.360 and 25 percent vapor and it is going to 00:24:51.64000:24:51.650 continue to change state as it passes 00:24:54.59000:24:54.600 through the evaporator coil and it's 00:24:58.34000:24:58.350 changing state from liquid to vapor and 00:25:00.62000:25:00.630 remember that when we are changing state 00:25:03.89000:25:03.900 that requires a tremendous amount of 00:25:06.32000:25:06.330 heat energy so all of the indoor 75 00:25:10.64000:25:10.650 degree air that's passing across this 00:25:13.31000:25:13.320 coil the heat energy in the form of 00:25:16.76000:25:16.770 molecules of motion are being removed 00:25:19.81000:25:19.820 from the air so as we remove the heat 00:25:23.60000:25:23.610 we're able to now blow out 00:25:26.24000:25:26.250 55 degree fahrenheit room air and and 00:25:31.22000:25:31.230 begin to cool the home so we really 00:25:33.74000:25:33.750 don't cool the house we remove the heat 00:25:36.89000:25:36.900 from the air which makes it feel cooler 00:25:39.88000:25:39.890 now let's take a look at something here 00:25:42.05000:25:42.060 so we're at 75 percent liquid 25 percent 00:25:45.65000:25:45.660 vapor as we exit the metering device and 00:25:52.32000:25:52.330 we are at sixteen 00:25:53.94000:25:53.950 PSIG 00:25:57.47000:25:57.480 which equates to 40 degrees Fahrenheit 00:26:07.21000:26:07.220 now this is the PT chart that we have in 00:26:09.98000:26:09.990 our book 00:26:11.61000:26:11.620 and let's just verify that now remember 00:26:13.71000:26:13.720 we talked about the PT chart this only 00:26:15.87000:26:15.880 has the it it only relates to our 00:26:22.44000:26:22.450 refrigerant when is that the saturation 00:26:24.45000:26:24.460 point so that's when we were at that 00:26:27.06000:26:27.070 saturation point right now at the coil 00:26:28.92000:26:28.930 now in this example we're using our 00:26:31.83000:26:31.840 twenty two refrigerant which happens to 00:26:34.20000:26:34.210 be this column right here and if we go 00:26:36.57000:26:36.580 back 00:26:42.80000:26:42.810 we're at 69 PSIG 00:26:47.05000:26:47.060 so let's take a look let's go down this 00:26:48.97000:26:48.980 let's go down this chart 00:26:53.77900:26:53.789 and this is our pressure column for our 00:26:58.34000:26:58.350 22 and at 69 psi G which is right about 00:27:02.47900:27:02.489 here if we read it over to our 00:27:05.23900:27:05.249 temperature column you can see that at 00:27:11.04900:27:11.059 when we have saturated refrigerant at 00:27:15.27900:27:15.289 for the sake of argument 69 psi G it is 00:27:19.94000:27:19.950 a it is 40 degrees 00:27:26.15900:27:26.169 and you can see here the gauge our gauge 00:27:29.03900:27:29.049 reads 69 psig 00:27:32.52000:27:32.530 and we have our thermometer on we can't 00:27:35.55000:27:35.560 really measure this in the coil but for 00:27:37.56000:27:37.570 the sake of our class we do if you could 00:27:41.49000:27:41.500 measure that coil we would read 40 00:27:43.26000:27:43.270 degrees and as this 00:27:46.55000:27:46.560 saturated refrigerant pass is passes 00:27:48.92000:27:48.930 through the evaporator coil it is 00:27:51.08000:27:51.090 starting to change state more and more 00:27:53.87000:27:53.880 and more and we're going from changing 00:27:56.36000:27:56.370 state from liquid to liquid to vapor 00:27:57.86000:27:57.870 picking up more 00:28:01.58000:28:01.590 heat in the form of latent heat again 00:28:04.10000:28:04.110 that's changing of state and 00:28:07.43000:28:07.440 at this point we're at about 50 50 50 00:28:10.63900:28:10.649 percent vapor 50% liquid and we are 00:28:15.37900:28:15.389 still at 69 PSIG and still at 40 degrees 00:28:18.74000:28:18.750 Fahrenheit because we're still at the 00:28:21.08000:28:21.090 saturation point remember any heat 00:28:23.21000:28:23.220 that's picked up is not measurable 00:28:25.26900:28:25.279 measurable when we're at the saturation 00:28:28.24900:28:28.259 point it changes the state of the 00:28:30.08000:28:30.090 refrigerant so it's changing state from 00:28:33.13900:28:33.149 liquid to vapor as we move through the 00:28:35.41900:28:35.429 evaporator coil and it's sucking the 00:28:36.98000:28:36.990 heat out of the indoor air 00:28:39.33000:28:39.340 now at a certain point that where it is 00:28:43.66900:28:43.679 where the engineers design this coil we 00:28:47.82000:28:47.830 are now going to change this refrigerant 00:28:50.24900:28:50.259 is now no longer going to be at a 00:28:52.35000:28:52.360 saturation point although it's still at 00:28:54.60000:28:54.610 69 psi G we are now at 00:28:59.90000:28:59.910 don't 100% vapor point and from here on 00:29:06.01000:29:06.020 we are no longer picking up sensible 00:29:09.13000:29:09.140 heat we are excuse me we're no longer 00:29:11.62000:29:11.630 picking up latent heat we're picking up 00:29:13.63000:29:13.640 sensible heat and if we put our 00:29:15.94000:29:15.950 thermometer on the line after we have 00:29:18.76000:29:18.770 changed the state of that refrigerant 00:29:21.57000:29:21.580 completely from liquid to vapor we can 00:29:25.41900:29:25.429 now start to measure the sensible heat 00:29:30.44000:29:30.450 of the refrigerant remember when we 00:29:32.69000:29:32.700 talked about our sensible heat let's 00:29:36.53000:29:36.540 take a look at that in this chart here 00:29:40.53900:29:40.549 so 00:29:44.34000:29:44.350 here's our here's the point where the 00:29:46.35000:29:46.360 refrigerant enters the evaporator coil 00:29:49.53000:29:49.540 it's it's at 75 percent liquid 25 00:29:54.90000:29:54.910 percent vapor and as it travels through 00:29:58.08000:29:58.090 the 00:29:59.66000:29:59.670 evaporator coil it's picking up all of 00:30:02.12000:30:02.130 the heat and changing state and that's 00:30:04.52000:30:04.530 where all the heat energy is absorbed 00:30:06.20000:30:06.210 into the refrigeration system and at 00:30:08.90000:30:08.910 this point in our evaporator coil that 00:30:11.24000:30:11.250 we just looked at we're now at a hundred 00:30:13.64000:30:13.650 percent vapor and any heat that's gained 00:30:17.54000:30:17.55000:30:19.47900:30:19.489 sensible heat and that is our 00:30:21.43000:30:21.440 superheating point right here 00:30:23.79900:30:23.809 there is really no cooling that happens 00:30:26.16900:30:26.179 with the super heat 00:30:28.50000:30:28.510 we have super heat 00:30:33.39000:30:33.400 to make sure that we have 100% vapor 00:30:37.52000:30:37.530 going back to the compressor so we're 00:30:40.65000:30:40.660 going to go through this quickly again 00:30:43.38000:30:43.390 so we have 00:30:48.03000:30:48.040 solid column of sub cooled refrigerant 00:30:51.29900:30:51.309 hits our metering device metering device 00:30:53.22000:30:53.230 drops the pressure which drops the 00:30:55.20000:30:55.210 temperature it changes us into the 00:30:57.00000:30:57.010 saturation state where we have 75% 00:31:00.15000:31:00.160 liquid and 25% vapor that refrigerant is 00:31:03.41900:31:03.429 flowing through the evaporator coil and 00:31:07.43000:31:07.440 the heat energy from the indoor room 00:31:11.46000:31:11.470 again to 75 degrees in the room we're at 00:31:14.25000:31:14.260 40 degrees Fahrenheit here heat travels 00:31:16.28900:31:16.299 from the sub substance with more heat to 00:31:19.28900:31:19.299 a substance with less heat and those 00:31:22.11000:31:22.120 molecules of motion and all that heat 00:31:24.24000:31:24.250 energy is used to change the state of 00:31:27.40900:31:27.419 from liquid to vapor in the evaporator 00:31:30.21000:31:30.220 at a certain point designed by the 00:31:32.73000:31:32.740 engineers we hit 100% vapor and any heat 00:31:37.77000:31:37.780 that's gained is the form is in the form 00:31:41.01000:31:41.020 of sensible heat which is our super heat 00:31:43.86000:31:43.870 and that makes sure that we have 100% 00:31:47.10000:31:47.110 vapor going back to the outdoor unit to 00:31:49.79900:31:49.809 the compressor because we all know you 00:31:51.00000:31:51.010 can't compress liquid 00:31:54.98000:31:54.990 all right so we hit we hit the 00:31:58.03900:31:58.049 evaporator we hit the compressor with 00:32:05.42000:32:05.430 100% vapor that has 20 degrees of 00:32:08.60000:32:08.610 superheat 00:32:10.90000:32:10.910 added to its 100% vapor now remember our 00:32:13.84000:32:13.850 gas laws so when you come when this 00:32:16.06000:32:16.070 compressor compresses the refrigerant 00:32:20.06000:32:20.070 it increases the pressure which 00:32:22.70000:32:22.710 increases the temperature now we we have 00:32:27.32000:32:27.330 20 degrees of superheat in this vapor 00:32:29.63000:32:29.640 and after it comes out of the out of the 00:32:32.75000:32:32.760 compressor it is still it still contains 00:32:36.32000:32:36.330 that 20 degrees of superheat 00:32:41.78900:32:41.799 and as that refrigerant travels out of 00:32:44.31000:32:44.320 the compressor it is beginning to cool 00:32:47.54900:32:47.559 down and it's D super heating and it is 00:32:50.99900:32:51.009 just letting off the sensible heat as it 00:32:54.72000:32:54.730 enters in the into the condenser coil so 00:32:58.49900:32:58.509 we're at 278 psi G and at a certain 00:33:02.46000:33:02.470 point in the condenser coil we are going 00:33:04.64900:33:04.659 to hit the saturation point of this 00:33:08.60000:33:08.610 refrigerant and if we take a look 00:33:17.00000:33:17.010 right here 278 PSIG here's our r22 00:33:22.37000:33:22.380 column here's our temperature column 00:33:25.46000:33:25.470 this is such the saturation point 278 00:33:29.04900:33:29.059 psig for r22 means it's at 125 degree 00:33:35.77000:33:35.780 temperature 00:33:38.84000:33:38.850 now 00:33:41.00000:33:41.010 we know that 00:33:45.27000:33:45.280 heat travels from a substance with more 00:33:47.94000:33:47.950 heat more molecules emotion to us to one 00:33:51.18000:33:51.190 with less molecules of motion so our 00:33:53.76000:33:53.770 outdoor air is 95 degrees Fahrenheit our 00:33:58.52000:33:58.530 saturated refrigerant 00:34:02.72000:34:02.730 at 125 degrees Fahrenheit so that heat 00:34:06.91900:34:06.929 is traveling and leaving the 125 degree 00:34:12.40900:34:12.419 condenser and is being dumped into the 00:34:15.95000:34:15.960 95 degree air so we're from this point 00:34:20.48000:34:20.490 on we are now 00:34:23.51000:34:23.520 condensing back from vapor 100% vapor 00:34:28.63900:34:28.649 and then we start to travel through the 00:34:30.88900:34:30.899 evaporator coil and we are condensing 00:34:33.10900:34:33.119 back down into liquid so all the heat 00:34:35.51000:34:35.520 that we picked up over here has been 00:34:37.60900:34:37.619 carried outside and we're dumping it 00:34:41.18000:34:41.190 outside remember that all that heat 00:34:45.20000:34:45.210 energy in this evaporator coil is now 00:34:49.24900:34:49.259 being released outside so now we're 00:34:53.05900:34:53.069 condensing back from 00:34:58.12000:34:58.130 from vapor to liquid and as it travels 00:35:02.28900:35:02.299 through the evaporate or the condensing 00:35:03.99900:35:04.009 coil all that tremendous amount of heat 00:35:06.78900:35:06.799 energy is being released and and again 00:35:09.40000:35:09.410 if we have a thermometer at any point in 00:35:11.79900:35:11.809 the condensing coil as long as we're at 00:35:13.80900:35:13.819 the saturation point it's 125 degree 00:35:17.22900:35:17.239 fahrenheit now I just saw a question pop 00:35:20.46900:35:20.479 up there let me let me take a look at 00:35:23.38000:35:23.390 that here and I'll answer that question 00:35:32.07000:35:32.08000:35:38.33000:35:38.340 okay Andrew I'll get back with you on 00:35:40.64000:35:40.650 that on that question okay so we have 00:35:48.09000:35:48.100 we are at the saturation point through 00:35:50.82000:35:50.830 the condensing coil we're dumping the 00:35:53.73000:35:53.740 heat to the outside air and at a certain 00:35:56.46000:35:56.470 point we are now back to 100% liquid 00:36:02.83000:36:02.840 now any oh now the heat that is being 00:36:06.10000:36:06.110 released from this liquid is in the form 00:36:10.81000:36:10.820 of sub cooled liquid and let's take a 00:36:12.97000:36:12.980 look at that take a look at our chart 00:36:16.42000:36:16.430 here real quick 00:36:20.83000:36:20.840 all right so let's take a look what we 00:36:22.42000:36:22.430 what we just talked about 00:36:25.77000:36:25.780 so here's our sensible heat remember 00:36:28.62000:36:28.630 this is our superheated vapor point 00:36:32.07000:36:32.080 right here 00:36:34.95000:36:34.960 it enters the condensing coil and we are 00:36:38.94000:36:38.950 changing from 100% vapor back down to 00:36:42.08900:36:42.099 100% liquid at the point where it's 100% 00:36:46.01000:36:46.020 liquid we start to pick up sensible heat 00:36:50.76000:36:50.770 so this is our sub cooling 00:36:54.18000:36:54.190 point so if we took our refrigeration 00:36:56.73000:36:56.740 cycle and we started 00:36:59.42000:36:59.430 right here at the 00:37:04.51000:37:04.520 well we're going to start right here 00:37:08.83900:37:08.849 we'll start right here with subcooled 00:37:10.40000:37:10.410 liquid that hits our 00:37:13.31000:37:13.320 metering device it goes immediately from 00:37:17.69000:37:17.700 sub-cooled liquid to a saturation point 00:37:22.45000:37:22.460 to the evaporator 00:37:24.91000:37:24.920 boils off the refrigerant which is 00:37:27.37000:37:27.380 changing state it takes tons of heat to 00:37:30.43000:37:30.440 do that absorbs all that heat till is 00:37:33.37000:37:33.380 100% vapor and then it goes into the 00:37:37.80900:37:37.819 super heating part where it's picking up 00:37:39.60900:37:39.619 sensible heat at that point it hits the 00:37:42.03900:37:42.049 compressor it gets compressed 00:37:46.19000:37:46.200 and the first part of the condensing 00:37:49.46000:37:49.470 coil D superheats removes the heat we 00:37:52.25000:37:52.260 hit the saturation point it comes back 00:37:54.77000:37:54.780 down as it condenses back down from the 00:37:58.46000:37:58.470 saturation point in two hundred percent 00:38:00.07900:38:00.089 liquid goes through the evaporator by 00:38:02.90000:38:02.910 the condenser excuse me and it becomes 00:38:05.72000:38:05.730 sub cooled liquid again then it hits the 00:38:08.27000:38:08.280 metering device goes back through the 00:38:11.34900:38:11.359 evaporator coil and that is our 00:38:13.46000:38:13.470 refrigeration cycle so 00:38:20.10000:38:20.110 what we do is we take actually in 00:38:24.33000:38:24.340 refrigeration as we take 00:38:28.21000:38:28.220 heat from a place where it's not needed 00:38:30.91000:38:30.920 which is the your home 00:38:34.57900:38:34.589 and we take it and release it to a place 00:38:39.44000:38:39.450 where it really doesn't matter which is 00:38:42.06900:38:42.079 outside and it's all done through 00:38:47.36000:38:47.370 do the refrigeration process so let's go 00:38:49.88000:38:49.890 through this one more time then we'll 00:38:53.21000:38:53.220 get we'll have about 10 or 15 minutes 00:38:56.84000:38:56.850 for questions and to wrap this up 00:38:59.91000:38:59.920 all right so we're going to start we 00:39:02.88000:39:02.890 hate we hit our metering device with a 00:39:05.66000:39:05.670 solid column of sub cold refrigerant the 00:39:09.59900:39:09.609 metering device immediately drops the 00:39:13.97000:39:13.980 refrigerant from sub cooled into the 00:39:17.30900:39:17.319 saturation point where it's 25% vapor 00:39:20.51900:39:20.529 and 75 percent liquid travels through 00:39:23.03900:39:23.049 the evaporator coil where the indoor 00:39:25.89000:39:25.900 room air is blown across the evaporator 00:39:29.88000:39:29.890 coil and the heat is from the indoor 00:39:33.08900:39:33.099 room air is transferred from the room 00:39:36.05900:39:36.069 air and is used to change the state of 00:39:38.46000:39:38.470 that refrigerant and that requires tons 00:39:41.54900:39:41.559 and tons of heat energy to do that so we 00:39:45.00000:39:45.010 are changing state changing state 00:39:46.68000:39:46.690 changing state all the way through the 00:39:48.90000:39:48.910 evaporator coil till we hit the certain 00:39:51.63000:39:51.640 point where we have is designed by the 00:39:53.91000:39:53.920 engineers all over all of the 00:39:56.46000:39:56.470 refrigerant is boiled off and we are now 00:39:59.70000:39:59.710 100% vapor and any heat that is picked 00:40:02.70000:40:02.710 up doesn't really cool anything but it 00:40:05.81900:40:05.829 does ensure that we have 100 percent 00:40:07.91000:40:07.920 vapor heading back to the compressor so 00:40:11.19000:40:11.200 we have superheated vapor coming back to 00:40:14.33900:40:14.349 the compressor the compressor uses the 00:40:17.51900:40:17.529 compression cycle to increase the 00:40:19.74000:40:19.750 pressure which in turns increase the 00:40:22.25900:40:22.269 temperature and we have superheated 00:40:25.04900:40:25.059 vapor leaving the compressor as it 00:40:28.34900:40:28.359 travels through the evaporator coil it 00:40:31.20000:40:31.210 is shedding all of the superheat that's 00:40:32.84900:40:32.859 called de-superheating until we hit the 00:40:35.19000:40:35.200 saturation point again of the 00:40:37.41000:40:37.420 refrigerant and we're changing state 00:40:38.91000:40:38.920 back from liquid to vapor as it travels 00:40:43.58900:40:43.599 through the evaporator coil all of that 00:40:46.01900:40:46.029 heat that is picked up inside the house 00:40:48.77900:40:48.789 is now released outside as it changes 00:40:51.56900:40:51.579 state at a certain point in the 00:40:53.46000:40:53.470 condensing coil we have now changed all 00:40:56.81900:40:56.829 of the refrigerant back into liquid and 00:40:59.88000:40:59.890 we have sub cooled liquid we have the 00:41:03.35900:41:03.369 sub cooling process which makes sure 00:41:05.46000:41:05.470 that we have 100% liquid 00:41:08.67000:41:08.680 coming back to the evaporator coil now 00:41:12.18000:41:12.190 that is and that is our refrigeration 00:41:14.33000:41:14.340 process that's the basic refrigeration 00:41:17.25000:41:17.260 process now if we're it if you're in one 00:41:20.55000:41:20.560 of my students in the HVAC class we're 00:41:23.13000:41:23.140 going to go through this again using a 00:41:26.42000:41:26.430 txp will talk about overcharging and 00:41:28.98000:41:28.990 undercharged systems and how that 00:41:30.90000:41:30.910 affects the the refrigeration cycle and 00:41:35.22000:41:35.230 system performance as well so I saw we 00:41:38.73000:41:38.740 had a couple of questions so let's see 00:41:45.46000:41:45.470 if we have any 00:41:51.77000:41:51.780 in Andrew if you just want to hang on 00:41:53.45000:41:53.460 there let me know but and then I'll chat 00:41:57.29000:41:57.300 with here in just a bit 00:42:04.77000:42:04.78000:42:08.28000:42:08.290 okay I I just had a question about how 00:42:13.08000:42:13.090 can I get involved in the class I do 00:42:17.49000:42:17.500 have if you go to HVAC training 00:42:20.64000:42:20.650 solutions net I do have an HVAC 00:42:24.09000:42:24.100 technician class commercial 00:42:26.46000:42:26.470 refrigeration for HVAC technician 00:42:28.29000:42:28.300 classes and Nate test prep courses and 00:42:35.63000:42:35.640 if you're really if you're interested in 00:42:37.37000:42:37.380 doing that you can reach me at H vac 00:42:39.35000:42:39.360 training solutions at gmail.com thanks 00:42:41.21000:42:41.220 for that question that wasn't a plug 00:42:42.53000:42:42.540 that was real that was really a question 00:42:46.76000:42:46.770 question if is it applicable to 00:42:48.89000:42:48.900 Canadians as well this HVAC class that I 00:42:51.85900:42:51.869 have gives you the basic knowledge and 00:42:55.21000:42:55.220 understanding of the refrigeration 00:42:57.02000:42:57.030 process as well as electronics and the 00:42:59.93000:42:59.940 reading schematic diagrams safety tubing 00:43:03.20000:43:03.210 and piping and so forth this prepares 00:43:05.39000:43:05.400 you to take an HVAC exam should your 00:43:09.92000:43:09.930 state or country require that and and 00:43:12.58900:43:12.599 gives you the basic knowledge needed to 00:43:14.39000:43:14.400 get it an entry-level position as an 00:43:16.31000:43:16.320 HVAC technician 00:43:20.85900:43:20.869 okay last chance for questions 00:43:26.57000:43:26.580 I'd like to thank everyone for coming if 00:43:31.55000:43:31.560 you go to HVAC training solutions net we 00:43:34.82000:43:34.830 do have our online training calendar and 00:43:38.75000:43:38.760 you can check out our training there and 00:43:42.32000:43:42.330 Joe I'll ask if you want to if you have 00:43:44.78000:43:44.790 if you want to stay late and have any 00:43:48.14000:43:48.150 questions answered please feel free to 00:43:50.00000:43:50.010 do so the rest of you thank you very 00:43:51.71000:43:51.720 very much
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