Consider a two-stage cascade refrigeration system operating between thepressure limits of 1.4 MPa and 280 kPa using refrigerant-134a as the workingfluid. The heat rejection from the lower cycle to the upper cycle occurs in anadiabatic counterflow heat exchanger where the pressures in the upper andlower cycles are 0.5 MPa and 600 kPa, respectively. In both cycles, therefrigerant exits the condenser as a saturated liquid and enters the compressoras a saturated vapor. The isentropic efficiency of the compressors is 85 percent.Given the mass flow rate of the refrigerant through the lower cycle is 0.18 kg/s,calculate:(a) The mass flow rate of the refrigerant through the upper cycle.(b) The rate of heat extraction from the cooling area.(c) The Coefficient of Performance (COP) of this refrigeration system.

Two stage cascade refrigeration systemto determine the mass flow rate, rate of heat extraction from…

Answered: a) The mass flow rate of the…

a) The mass flow rate of the refrigerant through the upper cycle. 5) The rate of heat extraction from the cooling area. =) The Coefficient of Performance (COP) of this refrigeration 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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Applied Fluid Mechanics

A fluid is a substance that is continuously deformed by the application of shear stress. The rate of deformation of a fluid depends on its viscosity. The fluid tries to flow when it interacts with some other system.

Question

Consider a two-stage cascade refrigeration system operating between the
pressure limits of 1.4 MPa and 280 kPa using refrigerant-134a as the working
fluid. The heat rejection from the lower cycle to the upper cycle occurs in an
adiabatic counterflow heat exchanger where the pressures in the upper and
lower cycles are 0.5 MPa and 600 kPa, respectively. In both cycles, the
refrigerant exits the condenser as a saturated liquid and enters the compressor
as a saturated vapor. The isentropic efficiency of the compressors is 85 percent.
Given the mass flow rate of the refrigerant through the lower cycle is 0.18 kg/s,
calculate:
(a) The mass flow rate of the refrigerant through the upper cycle.
(b) The rate of heat extraction from the cooling area.
(c) The Coefficient of Performance (COP) of this refrigeration system.

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Step 2: calculation of enthalpy and temperature from steam table

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Step 3: mass flow rate

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Step 4: Total heat extraction

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Step 5: COP of the refrigeration

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