00:00:00.260 basic principle of refrigeration is 00:00:02.96000:00:02.970 simple just pass a colder liquid 00:00:05.39000:00:05.400 continuously around the object which is 00:00:07.76000:00:07.770 to be cooled 00:00:09.61000:00:09.620 this will take heat out from the object 00:00:12.87900:00:12.889 the whole refrigeration technology is 00:00:15.89000:00:15.900 after this how to produce cold liquid 00:00:18.89000:00:18.900 continuously we will see how this is 00:00:21.76900:00:21.779 achieved in this video this is what 00:00:26.45000:00:26.460 inside a refrigerator 00:00:30.18000:00:30.190 at the heart of the system is a simple 00:00:33.15000:00:33.160 device called throttling device 00:00:36.83000:00:36.840 cold liquid is produced with help of 00:00:39.45000:00:39.460 this phenomenon in this case throttling 00:00:42.78000:00:42.790 device is a capillary tube for effective 00:00:46.68000:00:46.690 throttling at Inlet refrigerant should 00:00:49.04900:00:49.059 be high pressure liquid 00:00:53.65000:00:53.660 throttling device is an obstruction to 00:00:56.18000:00:56.190 the flow which causes tremendous 00:00:57.97900:00:57.989 pressure drop due to drop in pressure 00:01:01.09900:01:01.109 boiling point of refrigerant comes down 00:01:03.61900:01:03.629 and it starts evaporating heat required 00:01:07.21900:01:07.229 for evaporation comes within the 00:01:09.46900:01:09.479 refrigerant so it's temperature drops 00:01:17.25000:01:17.260 if you check temperature across 00:01:19.60000:01:19.610 throttling device you can notice this 00:01:22.09000:01:22.100 drop 00:01:26.86000:01:26.870 next phase is simple just pass this cold 00:01:30.56000:01:30.570 liquid over the body where you have to 00:01:32.54000:01:32.550 absorb heat 00:01:38.76000:01:38.770 during heat absorption process 00:01:41.14000:01:41.150 refrigerant further evaporates and 00:01:43.48000:01:43.490 transforms into pure vapor so we have 00:01:47.95000:01:47.960 produced a required refrigeration effect 00:01:50.05000:01:50.060 if we can take this low-pressure vapor 00:01:53.11000:01:53.120 refrigerant to state before throttling 00:01:55.27000:01:55.280 process that is high-pressure liquid 00:01:57.82000:01:57.830 state we will be able to repeat this 00:02:00.19000:02:00.200 process so first step let's raise the 00:02:04.27000:02:04.280 pressure a compressor is introduced for 00:02:09.37000:02:09.380 this purpose compressor will raise the 00:02:12.97000:02:12.980 pressure back to its initial value 00:02:18.47000:02:18.480 but since it is compressing gas along 00:02:21.63000:02:21.640 with pressure temperature will also 00:02:23.55000:02:23.560 raise it is unavoidable 00:02:28.14000:02:28.150 now the refrigerant is high-pressure 00:02:30.91000:02:30.920 vapor to convert it to liquid state we 00:02:34.05900:02:34.069 are introducing another heat exchanger 00:02:37.08000:02:37.090 this heat exchanger is fitted outside 00:02:40.17900:02:40.189 refrigerator so it will liberate heat to 00:02:43.60000:02:43.610 the surroundings vapor will get 00:02:45.78900:02:45.799 convinced to liquid and temperature will 00:02:48.00900:02:48.019 come down to normal level so the 00:02:51.10000:02:51.110 refrigerant is back to its initial state 00:02:53.05000:02:53.060 again high-pressure liquid 00:02:57.82000:02:57.830 we can repeat this cycle over and over 00:03:00.52000:03:00.530 for continuous refrigeration this cycle 00:03:04.72000:03:04.730 is known as vapour compression cycle you 00:03:09.40000:03:09.410 can note more details of refrigerator 00:03:11.35000:03:11.360 components here to enhance heat transfer 00:03:15.46000:03:15.470 both evaporator and condenser are having 00:03:18.07000:03:18.080 fins attached to it since evaporator is 00:03:21.70000:03:21.710 cooling the surrounding air it is common 00:03:24.19000:03:24.200 that water will get condensed over it 00:03:25.99000:03:26.000 forming frost frequent removal of Frost 00:03:29.32000:03:29.330 is required to enhance heat transfer 00:03:31.86000:03:31.870 apart from raising pressure compressor 00:03:34.84000:03:34.850 also helps maintain flow in the 00:03:36.67000:03:36.680 refrigerant circuit usually hermetically 00:03:39.82000:03:39.830 sealed reciprocating type with proper 00:03:42.16000:03:42.170 sealing is used for this purpose since 00:03:45.31000:03:45.320 it is compressing gas huge amount of 00:03:47.68000:03:47.690 input power is required for this 00:03:49.66000:03:49.670 operation 00:03:52.44000:03:52.450 a simple energy balance of the system 00:03:55.26000:03:55.270 yields this relation 00:04:01.05000:04:01.060 performance of a refrigeration system 00:04:03.34000:04:03.350 can be defined as follows 00:04:09.10000:04:09.110 hope you had a good overview of working 00:04:11.63000:04:11.640 of a refrigerator thank you
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