Plate heat exchangers

WEBVTT
Kind: captions
Language: en

00:00:00.060
good morning guys John Wilson um I'm
00:00:04.039 00:00:04.049 back again I just wanted to do a video
00:00:07.550 00:00:07.560 on removal of plenty text changes or
00:00:11.299 00:00:11.309 basically the unnecessary removal at
00:00:13.580 00:00:13.590 plate heat exchangers and one of the
00:00:16.540 00:00:16.550 major call-outs that you guys get is
00:00:20.330 00:00:20.340 fluctuating hot water weather basically
00:00:22.670 00:00:22.680 the waters were in hot and cold and your
00:00:25.009 00:00:25.019 customer can be jumping into the shower
00:00:26.960 00:00:26.970 like a rabbit's nose in and out in and
00:00:29.060 00:00:29.070 out hot cold hot cold well obviously not
00:00:32.540 00:00:32.550 teaching just soaked eggs in any shape
00:00:33.950 00:00:33.960 or form but that's usually down to a
00:00:36.110 00:00:36.120 block plate heat exchanger and that
00:00:37.880 00:00:37.890 block block floaty texture is not a
00:00:39.650 00:00:39.660 boiler fault it's deadly that's within
00:00:41.360 00:00:41.370 the heat exchanger I've done some some
00:00:46.100 00:00:46.110 drawings here a flaky test you know I've
00:00:48.200 00:00:48.210 got a cook down heat exchanger for you
00:00:50.779 00:00:50.789 guys just to look at now here we've got
00:00:54.200 00:00:54.210 a plate heat exchanger of 82 degrees
00:00:56.450 00:00:56.460 coming in and let's say for instance lo
00:01:00.260 00:01:00.270 86 coming out really that can't happen
00:01:03.799 00:01:03.809 but we'll address that slowly here we've
00:01:06.530 00:01:06.540 got a heat exchanger would have 80
00:01:07.760 00:01:07.770 degrees C coming in and 70 degrees C
00:01:10.280 00:01:10.290 coming out here we've got 81 degrees C
00:01:13.429 00:01:13.439 coming in and 45 degrees C coming out
00:01:16.719 00:01:16.729 now these two differential clumps here
00:01:21.020 00:01:21.030 guys
00:01:21.560 00:01:21.570 these are clumped on to a piece of
00:01:23.630 00:01:23.640 copper pipe so basically the
00:01:26.120 00:01:26.130 differential between these two the the
00:01:28.370 00:01:28.380 instrumentation that we carry is not
00:01:29.929 00:01:29.939 accurate enough to get a readable for
00:01:31.760 00:01:31.770 the differential because it's a pipe so
00:01:33.800 00:01:33.810 the temperature is the same across that
00:01:35.480 00:01:35.490 pipe when we're doing a differential
00:01:37.340 00:01:37.350 reading when we come to a heat exchanger
00:01:40.160 00:01:40.170 heat exchanger in its own definition it
00:01:42.679 00:01:42.689 exchanges heat that's what it does okay
00:01:45.410 00:01:45.420 now the reason for this Follette will
00:01:48.889 00:01:48.899 you when you've got a boil that's final
00:01:50.240 00:01:50.250 drop it out going hot and cold always
00:01:52.490 00:01:52.500 make sure that the burner is actually
00:01:53.990 00:01:54.000 dropping out guys this 82 degrees C is
00:01:57.709 00:01:57.719 very very important and if we looked at
00:01:59.929 00:01:59.939 these heat exchangers this one is one
00:02:02.149 00:02:02.159 that's working there is a level of
00:02:03.859 00:02:03.869 debris in this one but this one is
00:02:05.990 00:02:06.000 working pretty decent because we've got
00:02:07.670 00:02:07.680 81 degrees C coming in and 45 degrees C
00:02:11.059 00:02:11.069 coming out this
00:02:12.290 00:02:12.300 one is way off because we've only got a
00:02:14.270 00:02:14.280 10 degree differential so basically it's
00:02:16.790 00:02:16.800 not becoming a heat exchangers becoming
00:02:18.620 00:02:18.630 a pipe and this one is very involved
00:02:20.840 00:02:20.850 with a steel degree C coming in and a
00:02:22.610 00:02:22.620 hotter temperature coming out now we
00:02:26.000 00:02:26.010 exchange the water the cold water comes
00:02:27.980 00:02:27.990 into the heat exchanger the flow from
00:02:30.350 00:02:30.360 the space heating as the diverter valve
00:02:32.930 00:02:32.940 moves across obviously we're getting the
00:02:34.880 00:02:34.890 transfer of heat okay now as the level
00:02:38.780 00:02:38.790 of debris comes more severe in this heat
00:02:41.300 00:02:41.310 exchanger the differential temperature
00:02:43.220 00:02:43.230 gets less and less and less and just
00:02:46.400 00:02:46.410 just to put it in simple terms basically
00:02:48.350 00:02:48.360 all we're doing guys we're changing the
00:02:50.660 00:02:50.670 heat exchanger into a pipe and why we
00:02:53.180 00:02:53.190 turn it into a fight because we just
00:02:54.680 00:02:54.690 will get to the stage where one single
00:02:56.390 00:02:56.400 track through the heat exchanger so it's
00:02:58.430 00:02:58.440 no longer an exchange in heat so the
00:03:00.560 00:03:00.570 course of action there's to the heat
00:03:02.300 00:03:02.310 exchange it out and give it a good
00:03:03.590 00:03:03.600 cleanse
00:03:04.130 00:03:04.140 now the reason for the video guys is
00:03:07.270 00:03:07.280 there is so many plate exchanges that
00:03:10.040 00:03:10.050 take now unnecessary and how many times
00:03:12.560 00:03:12.570 have you done it where you've been with
00:03:14.300 00:03:14.310 your customer you value booking they're
00:03:16.220 00:03:16.230 ready to show the custom of the debris
00:03:17.870 00:03:17.880 and surprise surprise you look a clown
00:03:20.000 00:03:20.010 because there's no debris in there well
00:03:22.040 00:03:22.050 there's a couple of checks that you need
00:03:23.840 00:03:23.850 to do before you start dragging platy
00:03:26.270 00:03:26.280 textures out the boilers and it will
00:03:27.860 00:03:27.870 save you a lot of time if you if you
00:03:29.390 00:03:29.400 heed what I'm saying now on a boiler we
00:03:32.960 00:03:32.970 have the space heating thermistor the
00:03:34.580 00:03:34.590 primary thermistor what you'll call and
00:03:36.410 00:03:36.420 this is on the the central heating floor
00:03:38.810 00:03:38.820 when the diverter valves in the heating
00:03:41.090 00:03:41.100 mode this pipe supplies this space
00:03:42.770 00:03:42.780 heating when we're in domestic hot water
00:03:44.300 00:03:44.310 the diverter valve mechanism moves
00:03:46.670 00:03:46.680 across and we move it to supply the
00:03:49.040 00:03:49.050 plate now the sense rating thermistor
00:03:51.680 00:03:51.690 has three functions the first function
00:03:54.740 00:03:54.750 is for temperature modulation of the
00:03:56.420 00:03:56.430 heating the second function is built-in
00:03:59.780 00:03:59.790 frost protection at 10 degrees the pump
00:04:01.880 00:04:01.890 energizes at 5 degrees of the Bertha
00:04:04.190 00:04:04.200 burner will fire and raise it to 25
00:04:06.500 00:04:06.510 degrees C so it spikes that frost on one
00:04:09.080 00:04:09.090 and that's across most vile as these
00:04:10.850 00:04:10.860 days now the third function is very
00:04:13.790 00:04:13.800 important its high limit and high limit
00:04:16.880 00:04:16.890 is rated between 82 and 85 degrees and
00:04:20.210 00:04:20.220 that's pretty much a standard in the
00:04:21.890 00:04:21.900 industry
00:04:22.480 00:04:22.490 so the high-limit is what kicks in when
00:04:25.420 00:04:25.430 the burner actually drops out so that's
00:04:27.129 00:04:27.139 why the customer gets hot and cold water
00:04:28.840 00:04:28.850 because it's the high limit staff that's
00:04:31.540 00:04:31.550 reaching 82 because why is this getting
00:04:33.640 00:04:33.650 so hot it can't dissipate the heat
00:04:35.770 00:04:35.780 because the plate heat exchangers bundle
00:04:37.809 00:04:37.819 with debris so that's the reason for it
00:04:39.670 00:04:39.680 drop in now it's the higher limits that
00:04:41.080 00:04:41.090 that dictates that okay now one thing
00:04:44.980 00:04:44.990 the couple of things that you must do
00:04:47.050 00:04:47.060 are I mean I'm not saying most I
00:04:49.360 00:04:49.370 recommend that you do okay
00:04:51.870 00:04:51.880 this isn't all that mascara compliance
00:04:54.370 00:04:54.380 and this is a standard Honeywell gas
00:04:57.249 00:04:57.259 valve along this gas valve we have a
00:04:59.740 00:04:59.750 plastic note and we have a brass nut
00:05:01.990 00:05:02.000 okay the plastic that the blast note is
00:05:04.749 00:05:04.759 the low burner pressure the plastic
00:05:06.370 00:05:06.380 notice the high burner pressure now with
00:05:10.360 00:05:10.370 a gas valve the high burner pressure is
00:05:12.939 00:05:12.949 controlled by the per mr and the setting
00:05:15.820 00:05:15.830 the low burner pressure on Iran all
00:05:17.800 00:05:17.810 atmospheric boilers guys is purely a
00:05:19.899 00:05:19.909 manual setting so let's say this
00:05:21.790 00:05:21.800 particular boiler the low burner presses
00:05:23.920 00:05:23.930 to millibar on domestic hot water and
00:05:25.749 00:05:25.759 heating and the high is 11.2 now let's
00:05:30.339 00:05:30.349 say for instance that somebody has set
00:05:32.800 00:05:32.810 that low burner pressure far too high if
00:05:35.050 00:05:35.060 the set that far too high we've got a
00:05:37.270 00:05:37.280 big problem there because basically it
00:05:40.060 00:05:40.070 won't modulate so when the customers
00:05:42.430 00:05:42.440 running hot water that's why they're
00:05:44.320 00:05:44.330 having problems with it going hot and
00:05:45.490 00:05:45.500 cold it's not the plant that's bong nope
00:05:47.529 00:05:47.539 it's the low burner pressure that's too
00:05:49.360 00:05:49.370 high so you've wiped out the modulation
00:05:51.249 00:05:51.259 and basically the pipe with the prime
00:05:53.290 00:05:53.300 minister mister will get hot and it
00:05:55.120 00:05:55.130 would mimic the plate heat exchanger
00:05:56.770 00:05:56.780 being blocked the other thing that you
00:05:59.080 00:05:59.090 must check so that's one point to try
00:06:01.510 00:06:01.520 and remember this will save you hours in
00:06:03.010 00:06:03.020 your career the other thing to remember
00:06:04.749 00:06:04.759 here I've got at the mister sheet if you
00:06:08.230 00:06:08.240 just pan down onto the shade if you can
00:06:10.180 00:06:10.190 if you can't get this then out the we'll
00:06:12.850 00:06:12.860 gladly send you on this the mr. shake
00:06:15.279 00:06:15.289 here I've got a clip-on thermistor
00:06:17.939 00:06:17.949 the multimeter here
00:06:23.749 00:06:23.759 one thing with multimeters I suggest if
00:06:28.170 00:06:28.180 you don't fully understand the operation
00:06:30.270 00:06:30.280 of a multimeter don't buy an expensive
00:06:32.730 00:06:32.740 automatic one to start off with start
00:06:35.310 00:06:35.320 off with a cheaper one if you actually
00:06:36.930 00:06:36.940 set the range and if you physically have
00:06:39.420 00:06:39.430 to set the raise guys it's like
00:06:41.249 00:06:41.259 train-the-trainer so when you set in the
00:06:43.379 00:06:43.389 range you understand what the ranges are
00:06:45.150 00:06:45.160 so give yourself six month with a
00:06:46.650 00:06:46.660 cheaper multimeter get to know the range
00:06:48.870 00:06:48.880 settings and then by all these move on
00:06:51.330 00:06:51.340 to your all-singing all-dancing fancy
00:06:52.950 00:06:52.960 one that's automatic when you lose touch
00:06:55.110 00:06:55.120 of what the range settings are by all
00:06:57.150 00:06:57.160 means then go back to your cheaper one
00:06:58.980 00:06:58.990 but train-the-trainer that's what life
00:07:00.719 00:07:00.729 is all about train yourself okay right
00:07:03.360 00:07:03.370 so if I take a reason on this the mr.
00:07:07.590 00:07:07.600 okay I am looking there about ten point
00:07:11.189 00:07:11.199 nine two I'll just do that again no I'm
00:07:16.650 00:07:16.660 not I'm looking at eleven point five
00:07:18.360 00:07:18.370 okay so if I come down which are two
00:07:20.760 00:07:20.770 twenty degrees because that's going to
00:07:22.860 00:07:22.870 be the range and look somewhere near to
00:07:25.589 00:07:25.599 it there we're looking at eleven point
00:07:27.930 00:07:27.940 four two okay always ignore the last
00:07:30.210 00:07:30.220 digit I'll explain this more in depth if
00:07:32.010 00:07:32.020 you wish so eleven point four two if I
00:07:35.400 00:07:35.410 look there at twenty degrees come up at
00:07:37.920 00:07:37.930 22 degrees so this the mister here guys
00:07:40.500 00:07:40.510 is reading look roughly 22 degrees now
00:07:44.040 00:07:44.050 we've already said that the high limit
00:07:46.529 00:07:46.539 is 82 to 85
00:07:48.990 00:07:49.000 so let's come to 82 at 82 degrees the
00:07:52.379 00:07:52.389 thermistor the negative temperature
00:07:54.000 00:07:54.010 coefficient will read one point one
00:07:56.370 00:07:56.380 seven now it's possible for this the
00:07:59.580 00:07:59.590 mister to be knocking off premature so
00:08:02.490 00:08:02.500 that the mister could be going to if you
00:08:05.010 00:08:05.020 like high limit at the 60 so it could be
00:08:07.740 00:08:07.750 going to high limit it at let's say two
00:08:10.080 00:08:10.090 point four nine now if that's the case
00:08:13.110 00:08:13.120 then obviously the on domestic hot water
00:08:14.909 00:08:14.919 also until eating the burner will drop
00:08:16.830 00:08:16.840 in and out again so it would simulate it
00:08:19.350 00:08:19.360 again that the plate heat exchange is
00:08:21.060 00:08:21.070 full of debris so what you must do guys
00:08:23.640 00:08:23.650 is checking low burner pressure and if
00:08:25.920 00:08:25.930 it's an apt if it's a premix applies
00:08:27.450 00:08:27.460 check the low the low fan speed is
00:08:29.969 00:08:29.979 because of the long fan speed to our
00:08:31.469 00:08:31.479 you're going to simulate exactly the
00:08:33.000 00:08:33.010 same on a premix but go back to
00:08:36.719 00:08:36.729 or they're always check that this visit
00:08:39.480 00:08:39.490 the primary semester because if that is
00:08:41.279 00:08:41.289 out orig it will simulate that place
00:08:43.800 00:08:43.810 full of debris and trust me guys some of
00:08:46.110 00:08:46.120 them are not the easiest jobs in the
00:08:47.280 00:08:47.290 world to get out so you know it will
00:08:49.530 00:08:49.540 save you a lot of time so that's just a
00:08:53.790 00:08:53.800 brief video about unnecessary taking out
00:08:56.280 00:08:56.290 plate heat exchangers okay I would say
00:08:59.879 00:08:59.889 if I am born into death I'll hop back in
00:09:01.800 00:09:01.810 but just trying to help out thank you
00:09:04.139 00:09:04.149 very much for your time thank you
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