Consider a two-stage cascade refrigeration system operating between the pressure limits of 1.2 MPa and 200 kPa with refrigerant-134a as the working fluid. The refrigerant leaves the condenser as a saturated liquid and is throttled to a flash chamber operating at 0.32 MPa. Part of the refrigerant evaporates during this flashing process, and this vapor is mixed with the refrigerant leaving the low-pressure compressor. The mixture is then compressed to the condenser pressure by the high-pressure compressor. The liquid in the flash chamber is throttled to the evaporator pressure and cools the refrigerated space as it vaporizes in the evaporator. The mass flow rate of the refrigerant through the low-pressure compressor is 0.11 kg/s. Assuming the refrigerant leaves the evaporator as a saturated vapor and the isentropic efficiency is 85 percent for both compressors, determine (a) the mass flow rate of the refrigerant through the high-pressure compressor, (b) the rate of heat removal from the refrigerated space, and (c) the COP of this refrigerator.
Consider a two-stage cascade refrigeration system operating between the pressure limits of 1.2 MPa and 200 kPa with refrigerant-134a as the working fluid. The refrigerant leaves the condenser as a saturated liquid and is throttled to a flash chamber operating at 0.32 MPa. Part of the refrigerant evaporates during this flashing process, and this vapor is mixed with the refrigerant leaving the low-pressure compressor. The mixture is then compressed to the condenser pressure by the high-pressure compressor. The liquid in the flash chamber is throttled to the evaporator pressure and cools the refrigerated space as it vaporizes in the evaporator. The mass flow rate of the refrigerant through the low-pressure compressor is 0.11 kg/s. Assuming the refrigerant leaves the evaporator as a saturated vapor and the isentropic efficiency is 85 percent for both compressors, determine (a) the mass flow rate of the refrigerant through the high-pressure compressor, (b) the rate of heat removal from the refrigerated space, and (c) the COP of this refrigerator.
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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Transcribed Image Text:Consider a two-stage cascade refrigeration system operating between the pressure limits of
1.2 MPa and 200 kPa with refrigerant-134a as the working fluid. The refrigerant leaves the
condenser as a saturated liquid and is throttled to a flash chamber operating at 0.32 MPa. Part of the
refrigerant evaporates during this flashing process, and this vapor is mixed with the refrigerant
leaving the low-pressure compressor. The mixture is then compressed to the condenser pressure by
the high-pressure compressor. The liquid in the flash chamber is throttled to the evaporator pressure
and cools the refrigerated space as it vaporizes in the evaporator. The mass flow rate of the
refrigerant through the low-pressure compressor is 0.11 kg/s. Assuming the refrigerant leaves the
evaporator as a saturated vapor and the isentropic efficiency is 85 percent for both compressors,
determine (a) the mass flow rate of the refrigerant through the high-pressure compressor, (b) the
rate of heat removal from the refrigerated space, and (c) the COP of this refrigerator.
Condenser
5
Expansion
High-press.
Compressor
valve
6
Flash
chamber
3
Expansion
Low-press.
Compressor
valve
Evaporator
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