and indicate, with arrows, the directions of working fluid flow. b. Determine the required operating pressures of the boiler and condenser (in kPa). (Answers: 1191.9 kPa and 421.3 kPa, respectively) c. Determine the quality of the R-22 at the entrance and exit of the condenser. (Answers: 0.9394 and 0.1878 respectively)

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
Chapter28: Special Refrigeration Applications
Section: Chapter Questions
Problem 15RQ: Why is two-stage compression popular for extra-low-temperature refrigeration systems?
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4. Consider a top secret military power supply for arctic environment operations that will produce
electrical power from the soldier's body heat. Model this power supply as a Carnot-cycle heat ENGINE
that uses R-22 as its working fluid. The boiler operates at 30°C and converts saturated liquid into
saturated vapor. The condenser operates at -5ºC.
a. Show the cycle on a T-S (temperature vs. specific entropy) diagram relative to the 2-phase region
and indicate, with arrows, the directions of working fluid flow.
b.
Determine the required operating pressures of the boiler and condenser (in kPa). (Answers:
1191.9 kPa and 421.3 kPa, respectively)
c.
Determine the quality of the R-22 at the entrance and exit of the condenser. (Answers: 0.9394
and 0.1878, respectively)
Transcribed Image Text:4. Consider a top secret military power supply for arctic environment operations that will produce electrical power from the soldier's body heat. Model this power supply as a Carnot-cycle heat ENGINE that uses R-22 as its working fluid. The boiler operates at 30°C and converts saturated liquid into saturated vapor. The condenser operates at -5ºC. a. Show the cycle on a T-S (temperature vs. specific entropy) diagram relative to the 2-phase region and indicate, with arrows, the directions of working fluid flow. b. Determine the required operating pressures of the boiler and condenser (in kPa). (Answers: 1191.9 kPa and 421.3 kPa, respectively) c. Determine the quality of the R-22 at the entrance and exit of the condenser. (Answers: 0.9394 and 0.1878, respectively)
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