Refrigeration and Air Conditioning Technology (MindTap Course List)
8th Edition
ISBN: 9781305578296
Author: John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson
Publisher: Cengage Learning
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Textbook Question
Chapter 28, Problem 16RQ
An R-404A system is operating with a -50°F evaporator and the condenser is operating at 115°F. What is the compression ratio of this system?
A. 16.9 to 1
B. 17.8 to 1
C. 19.1 to 1
D. 21.33 to 1
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Chapter 28 Solutions
Refrigeration and Air Conditioning Technology (MindTap Course List)
Ch. 28 - List the evaporating temperatures for liquid...Ch. 28 - Prob. 2RQCh. 28 - Prob. 3RQCh. 28 - Prob. 4RQCh. 28 - Prob. 5RQCh. 28 - Prob. 6RQCh. 28 - Prob. 7RQCh. 28 - Which are power supplies used for truck...Ch. 28 - What type of reserve capacity does truck...Ch. 28 - Why is truck refrigeration designed to provide...
Ch. 28 - How is the air distributed over the cargo in truck...Ch. 28 - Name two types of engines used for truck...Ch. 28 - Prob. 13RQCh. 28 - Truck trailers with their own refrigeration...Ch. 28 - Why is two-stage compression popular for...Ch. 28 - An R-404A system is operating with a -50F...Ch. 28 - Describe cascade refrigeration and tell why more...Ch. 28 - Why is a circulating brine system more attractive...Ch. 28 - Two methods used to power refrigeration...
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- A typical temperature relationship between a high-efficiency condenser and the ambient temperature is A. 10F. B. 20F. C. 30F. D. 40F.arrow_forwardWhen a standard-efficiency air-cooled condenser is used, the condensing refrigerant will normally be higher in temperature than the entering air temperature.arrow_forwardThe condensing pressure is 260 psig and the condenser outlet temperature is 108F for R-22. By how many degrees is the liquid subcooled in the condenser? A. 12F B. 42F C. 7F D. 14Farrow_forward
- The approach temperature for the evaporator is A. the difference between the suction and head pressures converted to temperature. B. the difference between the refrigerant boiling temperature and the suction-line temperature. C. the difference between the refrigerant boiling temperature and the inlet water temperature. D. the difference between the refrigerant boiling temperature and the leaving-water temperature.arrow_forwardThe design boiling point for most evaporator coils in residential air-conditioning is_______F.arrow_forwardIf the evaporating pressure was 76 psig for R-22 and the compressor inlet temperature was 65F, what would be the total superheat entering the compressor? A. 11F B. 21F C. 10F D. 20Farrow_forward
- The typical temperature relationship between a standard-efficiency air-cooled condenser and the ambient temperature is A. 50F. B. 40F C. 30F. D. 20F.arrow_forwardMost condensers will subcool the refrigerant to between ____F below the condensing temperature of the refrigerant. A. 0 and 5 B. 5 and 10 C. 10 and 20 D. 20 and 30arrow_forwardWhat is the common refrigerant used in absorption refrigeration machines?arrow_forward
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