10-stage cascade refrigeration system operating between the pressure limits of 0.8 and 0.14 MPa. Each stage operates on the ideal vapour-compression refrigeration cycle with refrigerant-134a as the working fluid. Heat rejection from the lower cycle to the upper cycle takes place in an adiabaticcounter flow heat exchanger where both streams enter at about 0.4 MPa. If the mass flow rate of the refrigerant through the upper cycle is 0.24 kg/s, determinethe coefficient of performance of this cascade refrigerator.

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Answered: IWU-stage casčade retrigeration 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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19. 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 at an intermediate pressure. 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% at the lower cycle and 85% at the upper cycle. If the mass flow rate of the refrigerant through the lower cycle is 0.3 lb/s, determine: ib/s a. the mass flow rate of the refrigerant through the upper cycle b. the rate of heat removal from the refrigerated space TR c. BTU/hr the rate of heat removal from the refrigeration system d. the actual total compressor power input, Hp e. the actual COP of this system
The cold storage room is maintained at T; = -70 °C by two stage vapor-compression refrigeration unit. In the low temperature cycle, R170 (ethane) is used as the working fluid. In the high temperature cycle, R134a is used as the working fluid. After selecting reasonable pressures for all heat exchangers, calculate evaporator capacity, COP of the system, and compressor powers. Show refrigeration cycles on P-h diagrams uploaded with the midterm exam question sheet. Draw the T-s diagrams of R134a and R170 cycles as well. Draw schematic of refrigeration system with its components. Notes UL 1) Isentropic efficiency of compressors are 0.75. 2) Refrigerants leave the condensers as saturated liquid and exit from the evaporators as saturated vapor. 3) When determining the cooling requirement, only the wall conduction load will be taken into account. (consider 5 walls, neglect heat loss through the floor) 4) The inner and outer walls are normally covered with steel sheets, but their conduction…
x = 4 and y = 9, Consider a two-stage cascade refrigeration system operating between the pressure limits of 0.8 and 0.1x MPa. Each stage operates on the ideal vapor-compression refrigeration cycle with refrigerant-134a as the working fluid. Heat rejection from the lower cycle to the upper cycle takes place in an adiabatic counterflow heat exchanger where both streams enter at about 0.4y MPa. If the mass flow rate of the refrigerant through the upper cycle is 0.24 kg/s, determine: (a) Sketch T-s diagram by listing all the entry and exit points to each refrigeration equipment as well as labelling the pressure lines, (b) the mass flow rate of the refrigerant through the lower cycle, (c) the rate of heat removal from the refrigerated space and the power input to the compressor, (d) the coefficient of performance of this cascade refrigerator. Calculate the work done by a single compressor if it is to deliver the cooling load as above by compressing refrigerant-134a from 0.1x MPa to 0.8 MPa.…
1. An ideal vapor-compression refrigeration cycle that uses refrigerant-134a as its working fluid maintains a condenser at 800 kPa and the evaporator at -12°C. Determine this system's COP and the amount of power required to service a 150 kW cooling load. Answers: 4.87, 30.8 kW
The figure below shows a two-stage vapor-compression refrigeration system with ammonia as the working fluid. The system uses a direct-contact heat exchanger to achieve intercooling. The evaporator has a refrigerating capacity of 40 tons and produces -30°F saturated vapor at its exit. In the first compressor stage, the refrigerant is compressed adiabatically to 140 lbf/in.², which is the pressure in the direct contact heat exchanger. Saturated vapor at 140 lbf/in.² enters the second compressor stage and is compressed adiabatically to 250 lbf/in.² Each compressor stage has an isentropic efficiency of 85%. There are no significant pressure drops as the refrigerant passes through the heat exchangers. Saturated liquid enters each expansion valve. Determine: Expansion valve 6- Condenser Direct contact heat exchanger Expansion valve (a) the ratio of mass flow rates, m3/my. (b) the power input to each compressor stage, in horsepower. (c) the coefficient of performance Comp Comp Evaporator
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.
An ideal vapor-compression refrigeration cycle with refrigerant-134a as the working fluid is maintains a condenser at 1000 Kpa and the evaporator 40C. Determine the COP and the amount of power required to service a 400 KW cooling load.
please include Ps and Th diagram
ai 10roh 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…
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An ideal vapor-compression refrigeration cycle with refrigerant-134a as the working fluid operates between pressure limits of 40 and 300 psia. Determine (a) the heat absorptionin the evaporator, (b) the heat rejection in the condenser, (c) the work input, and (d) the COP.

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