A two-stage cascade refrigeration system operates between the condenser pressure of 440 psia and evaporator pressure of 120 psia with R-410a as the working fluid. Heat rejection from the lower cycle to the upper cycle takes place in an adiabatic counter-flow heat exchanger where the pressure in the upper and lower cycles are 220 psia and 230 psia, respectively. In both cycles, the refrigerant is a saturated liquid at the condenser exit and a saturated vapor at the compressor inlet, and the isentropic efficiency of the compressor is 80%. If the mass flow rate of the refrigerant through the lower cycle is 0.3 lb/s, determine: a. the mass flow rate of the refrigerant through the upper cycle Ib/s b. the rate of heat removal from the refrigerated space TR c. the rate of heat removal from the refrigeration system BTU/hr d. the actual total compressor power input, Hp e. the actual COP of this system
A two-stage cascade refrigeration system operates between the condenser pressure of 440 psia and evaporator pressure of 120 psia with R-410a as the working fluid. Heat rejection from the lower cycle to the upper cycle takes place in an adiabatic counter-flow heat exchanger where the pressure in the upper and lower cycles are 220 psia and 230 psia, respectively. In both cycles, the refrigerant is a saturated liquid at the condenser exit and a saturated vapor at the compressor inlet, and the isentropic efficiency of the compressor is 80%. If the mass flow rate of the refrigerant through the lower cycle is 0.3 lb/s, determine: a. the mass flow rate of the refrigerant through the upper cycle Ib/s b. the rate of heat removal from the refrigerated space TR c. the rate of heat removal from the refrigeration system BTU/hr d. the actual total compressor power input, Hp e. the actual COP of this system
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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A two-stage cascade refrigeration system operates between the condenser pressure of 440 psia and evaporator pressure of 120 psia
with R-410a as the working fluid. Heat rejection from the lower cycle to the upper cycle takes place in an adiabatic counter-flow heat
exchanger where the pressure in the upper and lower cycles are 220 psia and 230 psia, respectively In both cycles, the refrigerant is a
saturated liquid at the condenser exit and a saturated vapor at the compressor inlet, and the isentropic efficiency of the compressor
is 80%. If the mass flow rate of the refrigerant through the lower cycle is 0.3 lb/s, determine:
a. the mass flow rate of the refrigerant through the upper cycle
Ib/s
b. the rate of heat removal from the refrigerated space
TR
c. the rate of heat removal from the refrigeration system
BTU/hr
d. the actual total compressor power input,
Hp
e. the actual COP of this system
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