A two-evaporator compression refrigeration system as shown in the figure uses refrigerant-134a as the working fluid. The system operates evaporator 1 at 0°C, evaporator 2 at -26.4°C, and the condenser at 800 kPa. The refrigerant is circulated through the compressor at a rate of 0.1 kg/s, and the low-temperature evaporator serves a cooling load of 8 kW. Determine the cooling rate of the high-temperature evaporator, the power required by the compressor, and the COP of the system. The refrigerant is a saturated liquid at the exit of the condenser and a saturated vapor at the exit of each evaporator, and the compressor is isentropic. The pressure reducing valve drops the pressure of the evaporator 1 discharge to evaporator 2 discharge pressure. (Take the required values from saturated refrigerant-134a tables.)

A two-evaporator compression refrigeration system as shown in the figure uses refrigerant-134a as the working fluid. The system operates evaporator 1 at 0°C, evaporator 2 at -26.4°C, and the condenser at 800 kPa. The refrigerant is circulated through the compressor at a rate of 0.1 kg/s, and the low-temperature evaporator serves a cooling load of 8 kW. Determine the cooling rate of the high-temperature evaporator, the power required by the compressor, and the COP of the system. The refrigerant is a saturated liquid at the exit of the condenser and a saturated vapor at the exit of each evaporator, and the compressor is isentropic. The pressure reducing valve drops the pressure of the evaporator 1 discharge to evaporator 2 discharge pressure. (Take the required values from saturated refrigerant-134a tables.)

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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Question

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A two-evaporator compression refrigeration system as shown in the figure uses refrigerant-134a as the working fluid. The system
operates evaporator 1 at 0°C, evaporator 2 at -26.4°C, and the condenser at 800 kPa. The refrigerant is circulated through the
compressor at a rate of 0.1 kg/s, and the low-temperature evaporator serves a cooling load of 8 kW. Determine the cooling rate of the
high-temperature evaporator, the power required by the compressor, and the COP of the system. The refrigerant is a saturated liquid
at the exit of the condenser and a saturated vapor at the exit of each evaporator, and the compressor is isentropic. The pressure
reducing valve drops the pressure of the evaporator 1 discharge to evaporator 2 discharge pressure.
(Take the required values from saturated refrigerant-134a tables.)
1
↑
7
Pressure
reducing
valve
m₁ + m₂
Condenser
m₁
Evaporator 1
Evaporator 2
m₂
S
The cooling rate of the high-temperature evaporator is
of the system is
3
kW, the power required by the compressor is
kW, and the COP

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