Consider step 2 of the refrigeration cycle. Which of the following statements is the correct description of the physical processes at work? Question 3 options: An increase in pressure causes the refrigerant gas to evaporate. An increase in volume causes the refrigerant gas to evaporate. A decrease in volume causes the refrigerant liquid to evaporate. A decrease in pressure causes the refrigerant liquid to evaporate.

Consider step 2 of the refrigeration cycle. Which of the following statements is the correct description of the physical processes at work? Question 3 options: An increase in pressure causes the refrigerant gas to evaporate. An increase in volume causes the refrigerant gas to evaporate. A decrease in volume causes the refrigerant liquid to evaporate. A decrease in pressure causes the refrigerant liquid to evaporate.

Refrigeration and Air Conditioning Technology (MindTap Course List)

8th Edition

ISBN:9781305578296

Author:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson

Publisher:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson

Chapter22: Condensers

Section: Chapter Questions

Problem 7RQ: When a standard-efficiency air-cooled condenser is used, the condensing refrigerant will normally be...

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Define net refrigeration effect as it applies to the refrigeration cycle.
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The events of a cascade, split-stage, low temperature refrigerating cycle are as follows; A Freon 12 vapor compression system operates between 0˚F and 100˚F with saturated liquid on the high side of the expansion valve and saturated vapor entering the compressor whose volumetric efficiency is 90 %. An ammonia compression system operates between -60 ˚F and 12 ˚F with saturated liquid entering the expansion valve and saturated vapor entering the compressor whose volumetric efficiency is 88 %. The Freon 12 evaporator serves as the condenser for the ammonia for the ideal cycle and 2 tons of refrigeration. Find a) the displacement of each compressor. b) the total horsepower required for compressor efficiency of 80 %.
An ideal vapor-compression refrigeration cycle that uses refrigerant-134a as its working fluid maintains a condenser at 800 kPa and the evaporator at 15 kPa. Given 300 kW of cooling load, determine the following: 1. Construct didactic sketches, showing the operating principles of a refrigeration system.2. When you select a refrigerant for a certain application, what qualities would you look for in the refrigerant?3. Estimate the reversible COP values, if the low and high medium temperature are as for the evaporator and condenser.
3. When subcooling the liquid refrigerant:a. the refrigerating effect per unit mass increases. b. the mass rate of flow per unit capacity decreases. c. the volume flow rate per unit capacity decreases. d. the work of compression per unit mass remain the same. e. the COP increases. f. the theoretical power per unit capacity decreases. A simple saturated refrigeration cycle for R-12 system operates at an evaporating temperature of - 5oC and condensing temperature of 40oC. Show the effect from a to f if the liquid refrigerant is subcooled to 30 oC.

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	An increase in pressure causes the refrigerant gas to evaporate.
	An increase in volume causes the refrigerant gas to evaporate.
	A decrease in volume causes the refrigerant liquid to evaporate.
	A decrease in pressure causes the refrigerant liquid to evaporate.