7. A gas refrigeration system as shown in Fig.??, using air as the working fluid has a pressure ratio of 5. Air enters the compressor at 0 °C. The high pressure air is cooled to 35 °C by rejecting heat to the surroundings. The refrigerant leaves the turbine at -80 °C and then it absorbs heat from the refrigerated space before entering the regenerator. The mass flow rate of air is 0.4 kg/s. Assuming isentropic efficiencies of 80 % for the compressor and 85 % for the turbine and using constant specific heats at room temperature, determine 0.434] 21.4 kW 0.48 (a) the effectiveness of the regenerator, (b) the rate of heat removal from the refrigerated space, (c) the COP of the cycle, and (d) the refrigeration load and the COP if this system operated on the simple gas refrigeration cycle Use the same compressor inlet temp. as given, the same turbine inlet temperature as calculated, 27.7 kW, 0.599 and the same compressor and turbine efficiencies.
7. A gas refrigeration system as shown in Fig.??, using air as the working fluid has a pressure ratio of 5. Air enters the compressor at 0 °C. The high pressure air is cooled to 35 °C by rejecting heat to the surroundings. The refrigerant leaves the turbine at -80 °C and then it absorbs heat from the refrigerated space before entering the regenerator. The mass flow rate of air is 0.4 kg/s. Assuming isentropic efficiencies of 80 % for the compressor and 85 % for the turbine and using constant specific heats at room temperature, determine 0.434] 21.4 kW 0.48 (a) the effectiveness of the regenerator, (b) the rate of heat removal from the refrigerated space, (c) the COP of the cycle, and (d) the refrigeration load and the COP if this system operated on the simple gas refrigeration cycle Use the same compressor inlet temp. as given, the same turbine inlet temperature as calculated, 27.7 kW, 0.599 and the same compressor and turbine efficiencies.
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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![7. A gas refrigeration system as shown in Fig.??, using air as the working fluid has a pressure ratio
of 5. Air enters the compressor at 0 °C. The high pressure air is cooled to 35 °C by rejecting
heat to the surroundings. The refrigerant leaves the turbine at -80 °C and then it absorbs heat
from the refrigerated space before entering the regenerator. The mass flow rate of air is 0.4 kg/s.
Assuming isentropic efficiencies of 80 % for the compressor and 85 % for the turbine and using
constant specific heats at room temperature, determine
0.434]
21.4 kW
0.48
(a) the effectiveness of the regenerator,
(b) the rate of heat removal from the refrigerated space,
(c) the COP of the cycle, and
(d) the refrigeration load and the COP if this system operated on the simple gas refrigeration cycle
Use the same compressor inlet temp. as given, the same turbine inlet temperature as calculated,
27.7 kW, 0.599
and the same compressor and turbine efficiencies.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fb48e8361-f16e-48d9-835d-d8c07ab9a62d%2Fe443cbe0-bafc-480c-9bc4-3a26184c48fe%2F21s26cw.png&w=3840&q=75)
Transcribed Image Text:7. A gas refrigeration system as shown in Fig.??, using air as the working fluid has a pressure ratio
of 5. Air enters the compressor at 0 °C. The high pressure air is cooled to 35 °C by rejecting
heat to the surroundings. The refrigerant leaves the turbine at -80 °C and then it absorbs heat
from the refrigerated space before entering the regenerator. The mass flow rate of air is 0.4 kg/s.
Assuming isentropic efficiencies of 80 % for the compressor and 85 % for the turbine and using
constant specific heats at room temperature, determine
0.434]
21.4 kW
0.48
(a) the effectiveness of the regenerator,
(b) the rate of heat removal from the refrigerated space,
(c) the COP of the cycle, and
(d) the refrigeration load and the COP if this system operated on the simple gas refrigeration cycle
Use the same compressor inlet temp. as given, the same turbine inlet temperature as calculated,
27.7 kW, 0.599
and the same compressor and turbine efficiencies.
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