00:00:07.970 what we're gonna do today is I've got 00:00:10.53900:00:10.549 this old 80% furnace now this is from 00:00:14.35000:00:14.360 the middle 80s it was kind of the old 00:00:19.26900:00:19.279 standard furnace what they call the 80% 00:00:21.49000:00:21.500 it was a steady-state 80 but we are 00:00:25.72000:00:25.730 going to check the heat exchanger on the 00:00:28.87000:00:28.880 side this has actually got three heat 00:00:30.46000:00:30.470 exchangers and we're gonna check on the 00:00:33.85000:00:33.860 side of it the temperature and see how 00:00:36.46000:00:36.470 much temperature drop we have as we move 00:00:40.06000:00:40.070 up this heat exchanger as we go up you 00:00:45.73000:00:45.740 can see there's a top I just cut all 00:00:49.72000:00:49.730 that away and we're gonna do some 00:00:53.08000:00:53.090 temperature checks on this thing and see 00:00:55.84000:00:55.850 what temperature this heat exchanger is 00:01:00.28000:01:00.290 at different portions I remember the 00:01:02.91000:01:02.920 burner is right down here 00:01:05.96900:01:05.979 these are ribbon burners and salt they 00:01:09.76000:01:09.770 call way back like this and the flame 00:01:12.43000:01:12.440 goes up so let's see what the 00:01:15.10000:01:15.110 temperature is down here to start with 00:01:19.26000:01:19.270 now pretty much at the bottom you can 00:01:21.70000:01:21.710 see it's not very warm let's go up a 00:01:25.54000:01:25.550 couple inches now that's a lot warmer 00:01:42.99000:01:43.000 see now we're over 700 the highest 00:01:46.65000:01:46.660 temperature I'm reading is right there 00:01:50.03000:01:50.040 where that first indentation comes in 00:01:54.08000:01:54.090 about 840 you can notice this first 00:01:58.43000:01:58.440 indentation runs about 600 let's go up 00:02:03.30000:02:03.310 to the next one 00:02:05.98000:02:05.990 the second indentation looks like we're 00:02:10.35900:02:10.369 about 470 something like that 480 move 00:02:18.37000:02:18.380 up to the next one 00:02:25.30900:02:25.319 looks like we're about 340 00:02:33.71000:02:33.720 and to the next one not it's quite as 00:02:38.00000:02:38.010 much a drop kind depends on where you 00:02:39.77000:02:39.780 put the temperature probe now when we 00:02:43.79000:02:43.800 get to the top up here this last one 00:02:47.80000:02:47.810 it's actually gone down quite a bit to 00:02:51.53000:02:51.540 50 which is actually pretty low it's 00:02:54.61000:02:54.620 surprisingly low 00:03:00.12000:03:00.130 so those are the different temperatures 00:03:02.37000:03:02.380 as you go through this heat exchanger 00:03:04.44000:03:04.450 okay down here below that's actually 00:03:07.74000:03:07.750 blow the burners down there so it wasn't 00:03:09.99000:03:10.000 very hot and the gas was still burning 00:03:14.52000:03:14.530 there and still producing Heat now 00:03:17.31000:03:17.320 remember we're at 800 on the bottom and 00:03:19.68000:03:19.690 we're at about 300 on the top so as we 00:03:23.67000:03:23.680 went up there was a considerable drop 00:03:27.62000:03:27.630 you've got three of those indentations 00:03:31.64000:03:31.650 and more or less a hundred degrees per 00:03:34.80000:03:34.810 drop Plus that last one up here that 00:03:37.80000:03:37.810 dropped it quite a bit so that pretty 00:03:41.52000:03:41.530 much tells you what happens how fast the 00:03:44.73000:03:44.740 heat moves through these things now this 00:03:47.85000:03:47.860 is by far not the most efficient heat 00:03:49.83000:03:49.840 exchanger out there this was built 00:03:51.48000:03:51.490 before they have the requirements for 00:03:54.83000:03:54.840 efficiency it was called the 80% furnace 00:03:57.84000:03:57.850 it wasn't really a highly efficient 00:04:00.57000:04:00.580 furnace anyway that just kind of gives 00:04:02.64000:04:02.650 you an idea where the how the heat goes 00:04:04.77000:04:04.780 through these can't remember we're 00:04:07.11000:04:07.120 checking the outside of the heat 00:04:08.61000:04:08.620 exchanger on these things so we're 00:04:10.80000:04:10.810 really not checking what the gas 00:04:12.87000:04:12.880 temperatures are inside I'm gonna do 00:04:15.54000:04:15.550 another one on these a little later or 00:04:18.15000:04:18.160 with a higher efficiency furnace and 00:04:20.49000:04:20.500 we'll see what happens there
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