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# 2300_les14 - V The Second Law of Thermodynamics C...

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1 lesson 14 V. The Second Law of Thermodynamics C. Refrigerators and Heat Pumps 1. Introduction a. Cyclic devises that maintain a room or container at a roughly constant temperature. An air conditioner is a refrigerator. b. Simple schematic of refrigerator or heat pump. W net,in Refrig. or heat pump Q in Q out High-T sink Low-T source System boundary lesson 14 V. The Second Law of Thermodynamics 2. The coefficient of performance a. Refrigerator b. Heat pump in in R net,in out in in R out in QQ COP WQ Q Q or COP == = ± ±± out out HP net,in out in out HP out in COP Q Q or COP = ± W net,in Refrig. or heat pump Q in Q out High-T sink Low-T source (6-7, 6-9) (6-10, 6-11)

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2 lesson 14 V. The Second Law of Thermodynamics 3. A closer look at refrigeration equipment a. Schematic of equipment Compressor Throttle comp W ± in Q ± out Q ± Boundary of system Condenser Evaporator (from cold region) 1 2 3 4 lesson 14 V. The Second Law of Thermodynamics 3. A closer look at refrigeration equipment b. Schematic and sketch on Pv diagram Compressor Throttle comp W ± in Q ± out Q ± Condenser Evaporator 1 2 3 4 P v 1 exiting evaporator 2 exiting compressor 3 exiting condenser 4 exiting throttle
3 lesson 14 V. The Second Law of Thermodynamics 4. Example. The ice- making plant sketched at right makes 500 kg/h of ice. Determine the

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2300_les14 - V The Second Law of Thermodynamics C...

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