A 75-kW refrigeration load is to be carried by an air refrigerating system with a discharge pressure of 1,370 kPa and a refrigerator pressure of 345 kPa. Compression and expansion processes are polytropic with n = 1.37. The pressure at the start of expansion is 1344 kPa and the temperature is 32OC. Air temperature leaving the refrigerator is 0OC and entering the compressor is 5OC. Clearance for both compressor and expander is 5%. Draw the (a) Schematic diagram, (b) the P-V diagram and (c) the T-S diagram. Determine (d) the piston displacement of the compressor, (e) the piston displacement of the expand
A 75-kW refrigeration load is to be carried by an air refrigerating system with a discharge pressure of 1,370 kPa and a refrigerator pressure of 345 kPa. Compression and expansion processes are polytropic with n = 1.37. The pressure at the start of expansion is 1344 kPa and the temperature is 32OC. Air temperature leaving the refrigerator is 0OC and entering the compressor is 5OC. Clearance for both compressor and expander is 5%. Draw the (a) Schematic diagram, (b) the P-V diagram and (c) the T-S diagram. Determine (d) the piston displacement of the compressor, (e) the piston displacement of the expand
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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Question
A 75-kW refrigeration load is to be carried by an air refrigerating system with a discharge
pressure of 1,370 kPa and a refrigerator pressure of 345 kPa. Compression and expansion
processes are polytropic with n = 1.37. The pressure at the start of expansion is 1344 kPa
and the temperature is 32OC. Air temperature leaving the refrigerator is 0OC and entering
the compressor is 5OC. Clearance for both compressor and expander is 5%. Draw the
(a) Schematic diagram, (b) the P-V diagram and (c) the T-S diagram. Determine (d) the
piston displacement of the compressor, (e) the piston displacement of the expander,
(f) the net work and (g) the COP
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