A vapor-compression refrigeration system which utilizes refrigerant 134a as the working fluid comprises the two-stage compression configuration seen in the schematic below, with intercooling between the stages. 5 Condenser Expansion valve High-pressure compressor 3 Flash chamber 2 7 Expansion valve Low-pressure compressor Evaporator 1 The direct contact heat exchanger and the flash drum operate at 4 MPa, and the condenser pressure is 1.2 MPa. Saturated vapor at -30 °C enters the first compressor stage. Saturated liquid streams at 0.4 MPa and 1.2 MPa enter the low- and high-pressure expansion valves, respectively. The refrigeration capacity of the system is estimated to be 35.2 kW and each compressor is assumed to operate isentropically. Evaluate each compressor power input and the overall coefficient of performance of the system.

A vapor-compression refrigeration system which utilizes refrigerant 134a as the working fluid comprises the two-stage compression configuration seen in the schematic below, with intercooling between the stages. 5 Condenser Expansion valve High-pressure compressor 3 Flash chamber 2 7 Expansion valve Low-pressure compressor Evaporator 1 The direct contact heat exchanger and the flash drum operate at 4 MPa, and the condenser pressure is 1.2 MPa. Saturated vapor at -30 °C enters the first compressor stage. Saturated liquid streams at 0.4 MPa and 1.2 MPa enter the low- and high-pressure expansion valves, respectively. The refrigeration capacity of the system is estimated to be 35.2 kW and each compressor is assumed to operate isentropically. Evaluate each compressor power input and the overall coefficient of performance of the system.

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

A vapor-compression refrigeration system which utilizes refrigerant 134a as the working fluid
comprises the two-stage compression configuration seen in the schematic below, with
intercooling between the stages.
5
Condenser
Expansion
valve
High-pressure
compressor
6
3
Flash
chamber
9
2
7
Expansion
valve
Low-pressure
compressor
Evaporator
1
The direct contact heat exchanger and the flash drum operate at 4 MPa, and the condenser
pressure is 1.2 MPa. Saturated vapor at -30 °C enters the first compressor stage. Saturated liquid
streams at 0.4 MPa and 1.2 MPa enter the low- and high-pressure expansion valves,
respectively. The refrigeration capacity of the system is estimated to be 35.2 kW and each
compressor is assumed to operate isentropically. Evaluate each compressor power input and
the overall coefficient of performance of the system.

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A two stage cascade refrigeration system uses R-12 in the high pressure loop with a condenser temperature of 300C and -100C in the cascade condenser, and R-22 in the low pressure loop with a temperature in the cascade condenser of 00C and an evaporator temperature of -30 0C. The refrigeration load is 28 tons. h6 = 366 kJ/kg; h2= 421 kJ/kg Determine the ff:a.) the mass flow rate in the low pressure loop,ANSWER: 0.5097287949549 kg/s b.) the mass flow rate in the high pressure loop,ANSWER: 0.94987995754451 kg/s c.) total power requirementANSWER: 32.1224 KW
Working fluid is Refrigerant 134a. Vapor-compression refrigeration system has refrigerating capacity = 1650 Btu/hour. Refrigerant enters evaporator at -10F and leaves at 15F. Isentropic compressor efficiency = 74%. Refrigerant condenses at 140F and leaves condenser subcooled at 100F. No large pressure drops through evaporator and condenser. DETERMINE: 1. Pressure of evaporator in lbf/in^2 2. Pressure of condenser in lbf/in^2 3. Mass flow rate in lb/s of refrigerant 134a. 4. Power input in horsepower of compressor. 5. Coefficient of performance.
A two-stage vapor compression refrigeration system similar to the system in Fig. 10.10 of the textbook employs R134a as the working fluid. The intermediate system pressure is 6 bar, and the condenser operates at 12 bar. The high- and low- pressure expansion valves receive saturated liquid at 12 and 6 bars of pressure respectively. The first stage compressor receives saturated vapor at 10℃. Assume that the refrigeration capacity is 10 tons, and the compressors operate isentropically. Find: the coefficient of performance. the compressor power input, in kW.
MODULE: THERMODYNAMIC QUESTION 5 Consider a two-stage cascade refrigeration cycle with a flash chamber as shown in the figure with refrigerant-134a as the working fluid. The evaporator temperature is −10.09°C and the condenser pressure is 1600 kPa. The refrigerant leaves the condenser as a saturated liquid and is throttled to a flash chamber operating at 0.4 MPa. Part of the refrigerant evaporates during this flashing process, and this vapour 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. Assuming the refrigerant leaves the evaporator as a saturated vapour determine the COP of this refrigerator. NOTE: Your answer should be in 2 decimal places.