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Heat Exchanger and Types of Heat Exchanger HMT Tutorial- 19

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00:00:00.120
all right my dear so this is a very
00:00:02.629 00:00:02.639 close well total if you wanted to learn
00:00:04.789 00:00:04.799 about heat exchanger I'm sure it is
00:00:08.089 00:00:08.099 known as as II hate exchanger so I was
00:00:12.049 00:00:12.059 thinking why not to provide you some
00:00:13.700 00:00:13.710 basic information about fixed heat
00:00:18.050 00:00:18.060 exchanger well I have already said we do
00:00:20.599 00:00:20.609 couple of videos related to heat and
00:00:23.750 00:00:23.760 mass transfer so one of my student
00:00:26.060 00:00:26.070 already asked me sir provide some basic
00:00:28.790 00:00:28.800 approach to topic so I have a started
00:00:32.150 00:00:32.160 providing basic approach that's why this
00:00:34.610 00:00:34.620 video is for you okay so as you know
00:00:38.930 00:00:38.940 what is basically heat exchanger so if
00:00:41.840 00:00:41.850 you will say technically then it is a
00:00:43.940 00:00:43.950 steady flow open system device you can
00:00:46.610 00:00:46.620 say write steady flow open system yeah I
00:00:50.510 00:00:50.520 need to share with you because based on
00:00:52.850 00:00:52.860 this concept we have a very good
00:00:55.250 00:00:55.260 numerical approach steady flow open
00:01:00.200 00:01:00.210 system so basically what is the main
00:01:04.189 00:01:04.199 purpose or objective of redux led to
00:01:06.320 00:01:06.330 transfer heat from one body or one place
00:01:10.609 00:01:10.619 to another place that is the main
00:01:12.620 00:01:12.630 purpose purpose and we utilize heat in
00:01:16.520 00:01:16.530 that way
00:01:17.420 00:01:17.430 suppose that we use heat exchanger in
00:01:19.730 00:01:19.740 water cooler air created super heater
00:01:22.460 00:01:22.470 and even economizer
00:01:24.859 00:01:24.869 and we use economizer too - too hot or
00:01:30.740 00:01:30.750 must say - in case a temp out - you must
00:01:34.609 00:01:34.619 say tempest the word is the temperature
00:01:36.410 00:01:36.420 of water that's why it would have to use
00:01:39.710 00:01:39.720 a flue gases for increase the
00:01:43.940 00:01:43.950 temperature of water it would increase
00:01:45.830 00:01:45.840 the efficiency of the power plant even
00:01:49.020 00:01:49.030 okay so this is all about heat heat
00:01:52.680 00:01:52.690 exchanger okay now most important if
00:01:56.130 00:01:56.140 I'll talk about classification then
00:01:58.590 00:01:58.600 there are many ways to classify heat
00:02:01.290 00:02:01.300 exchanger many ways just like direct
00:02:05.280 00:02:05.290 contact with Accenture target contact
00:02:10.010 00:02:10.020 heat Accenture and it will ask example
00:02:15.870 00:02:15.880 of direct contact with exchanger then I
00:02:18.720 00:02:18.730 must say cooling tower so basically what
00:02:23.340 00:02:23.350 happens in case of direct contact with
00:02:25.380 00:02:25.390 Accenture we we allow hot fluid hot
00:02:30.840 00:02:30.850 fluid and cold fluid both mix of we
00:02:37.830 00:02:37.840 allow it that hot food and cold fluid
00:02:40.410 00:02:40.420 can be mix and then and then exchange
00:02:44.070 00:02:44.080 heat because of temperature difference
00:02:46.140 00:02:46.150 because heat exchange only can take
00:02:49.650 00:02:49.660 place if there is temperature difference
00:02:53.310 00:02:53.320 between two bodies or two places
00:02:56.820 00:02:56.830 all right now next one is direct contact
00:03:01.440 00:03:01.450 with extension is direct contact with
00:03:06.500 00:03:06.510 exchanger so what is it in direct
00:03:10.110 00:03:10.120 contact with exchanger that means it
00:03:13.080 00:03:13.090 will not allow to contact hot fluid and
00:03:18.120 00:03:18.130 core fluid the way till then we mix up
00:03:21.360 00:03:21.370 their easy care
00:03:24.150 00:03:24.160 suppose that hot fluid is flowing to it
00:03:26.340 00:03:26.350 and must be cold fever and there would
00:03:29.280 00:03:29.290 be a separating wall that's why both the
00:03:33.210 00:03:33.220 fluid will not mix up this is known as
00:03:35.910 00:03:35.920 indirect contact heat exchanger now
00:03:38.940 00:03:38.950 another example which is most important
00:03:41.610 00:03:41.620 as well as crucible that is the
00:03:44.970 00:03:44.980 regenerative type or maybe storage type
00:03:48.240 00:03:48.250 somebody said storage type storage type
00:03:52.949 00:03:52.959 or three generative
00:03:59.740 00:03:59.750 heat exchanger let me share with you a
00:04:02.870 00:04:02.880 diagram that's why you can understand
00:04:04.580 00:04:04.590 about it proper properly for health
00:04:08.300 00:04:08.310 codes suppose that hot fluid entering
00:04:10.190 00:04:10.200 here and cold fluid is entering here and
00:04:14.020 00:04:14.030 cold flavors is cold fluid is out in
00:04:17.539 00:04:17.549 here and our fluid is out of here
00:04:21.460 00:04:21.470 what happened in this type of heat
00:04:25.220 00:04:25.230 exchanger we xnz it first we have flowed
00:04:29.090 00:04:29.100 one of the one of the few at a time and
00:04:31.640 00:04:31.650 then we we float them the field that is
00:04:35.510 00:04:35.520 why what will happen this in this way is
00:04:39.200 00:04:39.210 way we exchange heat from hot for you
00:04:41.719 00:04:41.729 too cold field and you know what
00:04:44.060 00:04:44.070 happened here this this is the all these
00:04:47.330 00:04:47.340 and matrixes and this matrix is our of
00:04:49.969 00:04:49.979 salaries cellulose cellulose matrix this
00:04:57.560 00:04:57.570 is salvos matrix and this is how it
00:05:01.310 00:05:01.320 exchange it other than this we have also
00:05:04.790 00:05:04.800 rotating matrix type of regenerative
00:05:07.909 00:05:07.919 heat exchanger but I am NOT going to
00:05:10.100 00:05:10.110 share with that because I have few more
00:05:12.620 00:05:12.630 types of heat exchanger those are most
00:05:15.200 00:05:15.210 important for competitive examination
00:05:17.480 00:05:17.490 that's why I will share with you all
00:05:19.279 00:05:19.289 those types according to flow according
00:05:24.740 00:05:24.750 to flow there are three types of heat
00:05:27.590 00:05:27.600 exchanger a one is first one is parallel
00:05:31.370 00:05:31.380 flow second is counter flow and third
00:05:38.450 00:05:38.460 one is parallel flow counter flow and
00:05:40.550 00:05:40.560 third one is you know that cross flow
00:05:44.150 00:05:44.160 and let me share with you my dear if
00:05:47.779 00:05:47.789 you'll be paying for complete
00:05:49.310 00:05:49.320 examination it will ask question from
00:05:51.980 00:05:51.990 here they will ask all the application
00:05:54.320 00:05:54.330 pushed over time we have seen this but
00:05:57.200 00:05:57.210 if they will ask numerical then they
00:05:59.840 00:05:59.850 will ask from these two on this parallel
00:06:01.700 00:06:01.710 flow and counter flow
00:06:03.570 00:06:03.580 and most of our time they asked question
00:06:05.399 00:06:05.409 lmpd you need to find out LM telling you
00:06:09.020 00:06:09.030 once you will come to know all these
00:06:11.189 00:06:11.199 things you can do much better in the
00:06:13.379 00:06:13.389 complete examination well one of the
00:06:15.779 00:06:15.789 most one of the most basic quotient is
00:06:19.920 00:06:19.930 quotient they asked this which right now
00:06:23.670 00:06:23.680 I am going to share hope you will
00:06:26.640 00:06:26.650 understand and not hope you will
00:06:28.770 00:06:28.780 definitely understand I will share with
00:06:30.779 00:06:30.789 you in that way that's why you can
00:06:32.939 00:06:32.949 understand about the question right now
00:06:36.559 00:06:36.569 let's go for that
00:06:38.990 00:06:39.000 have you ever think what will happen if
00:06:41.790 00:06:41.800 first law of thermodynamics applied to
00:06:44.459 00:06:44.469 heat exchanger because as I have already
00:06:48.360 00:06:48.370 shared with you this the steady flow
00:06:50.159 00:06:50.169 open system then what will happen you
00:06:53.790 00:06:53.800 will apply first law of thermodynamics
00:06:56.519 00:06:56.529 to two heat exchanger them changing
00:07:01.409 00:07:01.419 enthalpy is equal to zero and because
00:07:05.519 00:07:05.529 net change in enthalpy of headaches and
00:07:09.029 00:07:09.039 regio then we can say enthalpy change of
00:07:12.499 00:07:12.509 hot fluid or fluid plus enthalpy change
00:07:17.459 00:07:17.469 of cold fluid cold fluid is equal to you
00:07:24.409 00:07:24.419 simple and as we can also say these
00:07:27.839 00:07:27.849 Delta hot fluid is equal to cold fluid
00:07:32.390 00:07:32.400 we can also write this right now rate of
00:07:36.329 00:07:36.339 enthalpy decrees of hot fluid and rate
00:07:39.300 00:07:39.310 of enthalpy increase of cold fluid based
00:07:42.869 00:07:42.879 on these we use Vedic eight a question
00:07:45.749 00:07:45.759 in the complete domination I hope you
00:07:48.869 00:07:48.879 wanted to know that right so basically
00:07:51.180 00:07:51.190 what happens what happened suppose that
00:07:54.540 00:07:54.550 we have even a question okay we have
00:07:56.640 00:07:56.650 space here I can share with you some
00:07:59.189 00:07:59.199 interesting fact suppose that we have
00:08:01.680 00:08:01.690 given a question that there is a part
00:08:03.930 00:08:03.940 and this four temperature water is 20
00:08:06.689 00:08:06.699 degrees in
00:08:07.290 00:08:07.300 it okay and here we have a rod this is a
00:08:11.339 00:08:11.349 steel rod and this temperature is 120
00:08:13.920 00:08:13.930 degree centigrade okay if we will put
00:08:16.830 00:08:16.840 this rod into this water then what will
00:08:22.680 00:08:22.690 happen what will happen I mean what
00:08:25.740 00:08:25.750 would be temperature temperature of
00:08:28.290 00:08:28.300 water after after sometime two minutes
00:08:32.670 00:08:32.680 three minutes five minutes that would be
00:08:34.500 00:08:34.510 depend on the quotient so if you will
00:08:37.259 00:08:37.269 see this type of question then remember
00:08:41.339 00:08:41.349 this is just a gift for you because I am
00:08:43.620 00:08:43.630 going to share with you a that's why you
00:08:46.079 00:08:46.089 can solve this type of question quite
00:08:48.180 00:08:48.190 easy suppose that if they will change
00:08:50.579 00:08:50.589 they will sell with you rate of heat
00:08:52.350 00:08:52.360 transfer is two Joule per seconds okay Q
00:08:57.120 00:08:57.130 Joule per second that means in what and
00:08:59.840 00:08:59.850 they ask you what will happen after two
00:09:02.790 00:09:02.800 minutes then you must multiple this Q
00:09:05.340 00:09:05.350 into two minutes to find out to find out
00:09:07.829 00:09:07.839 into June Joule per second okay you have
00:09:11.460 00:09:11.470 to convert into per second first second
00:09:15.030 00:09:15.040 second second thing which from blah you
00:09:18.870 00:09:18.880 need to use the simple formula Q is
00:09:21.120 00:09:21.130 equal to MC delta T from here
00:09:24.240 00:09:24.250 MC already is equal to MC delta T this
00:09:28.260 00:09:28.270 is for a steel and this is for water use
00:09:32.280 00:09:32.290 both the formula they will definitely
00:09:34.170 00:09:34.180 give you mass mass specificity
00:09:36.510 00:09:36.520 specificity change in temperature change
00:09:38.970 00:09:38.980 in
00:09:39.620 00:09:39.630 so you need to find out you need to find
00:09:42.559 00:09:42.569 out its changing temperature okay you
00:09:45.350 00:09:45.360 change in temperature and definitely you
00:09:48.620 00:09:48.630 can find out it okay so this is how we
00:09:51.860 00:09:51.870 can find out and one more thing I have
00:09:53.840 00:09:53.850 an already share with you this minus
00:09:55.730 00:09:55.740 sign will work here will work here this
00:09:59.300 00:09:59.310 minus sign will work here for a steal we
00:10:02.660 00:10:02.670 have to multiple the minus sign then
00:10:04.639 00:10:04.649 what will happen T 1 minus T 2 1 here T
00:10:07.220 00:10:07.230 2 minus T 1 this is how we can find out
00:10:10.100 00:10:10.110 temperature the I mean what will be the
00:10:12.410 00:10:12.420 temperature of this water after 2
00:10:14.990 00:10:15.000 minutes or 5 minutes that would be
00:10:16.610 00:10:16.620 different question I hope you understand
00:10:18.949 00:10:18.959 the most basic concept of heat exchanger
00:10:21.379 00:10:21.389 and some numerical approach I mean
00:10:24.259 00:10:24.269 numerical approach to solve numerical
00:10:26.809 00:10:26.819 problems practical approach I must say
00:10:28.759 00:10:28.769 that ok thanks for watching see you soon
00:10:31.309 00:10:31.319 in my next video bye bye

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