The refrigerant leaves the condenser as a saturated liquid and is throttled to a flash chamber operating at 0.6 MPa in a two-stage cascade refrigeration system operating between the pressure limits of 1.6 MPa and 240 kPa with refrigerant-134a as the working fluid. 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 0.25 kg/s. Assuming the refrigerant leaves the evaporator as a saturated vapor and the isentropic efficiency is 90 percent for both compressors. i) determine the mass flow rate of the refrigerant through the high-pressure compressor, ii) calculate the rate of heat removal from the refrigerated space, iii) find the COP of this refrigerator, and iv) Develop a refrigerator operated on a single-stage cycle between the same pressure limits with the same compressor efficiency and the same flow rate as in part (a).

The refrigerant leaves the condenser as a saturated liquid and is throttled to a flash chamber operating at 0.6 MPa in a two-stage cascade refrigeration system operating between the pressure limits of 1.6 MPa and 240 kPa with refrigerant-134a as the working fluid. 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 0.25 kg/s. Assuming the refrigerant leaves the evaporator as a saturated vapor and the isentropic efficiency is 90 percent for both compressors. i) determine the mass flow rate of the refrigerant through the high-pressure compressor, ii) calculate the rate of heat removal from the refrigerated space, iii) find the COP of this refrigerator, and iv) Develop a refrigerator operated on a single-stage cycle between the same pressure limits with the same compressor efficiency and the same flow rate as in part (a).

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

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Concept explainers

Basic Thermodynamic Processes

The word 'thermodynamics' can be divided into two words, 'thermo' and 'dynamics'. The word thermo deals with the heat and thermal phenomenon, whereas dynamics deals with forces or external agent that drives the heat flow or aids in the motion of heat.

Question

Thermodynamics

The refrigerant leaves the condenser as a saturated liquid and is throttled to a flash chamber
operating at 0.6 MPa in a two-stage cascade refrigeration system operating between the
pressure limits of 1.6 MPa and 240 kPa with refrigerant-134a as the working fluid. 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 0.25 kg/s. Assuming the refrigerant
leaves the evaporator as a saturated vapor and the isentropic efficiency is 90 percent for both
compressors.
i)
determine the mass flow rate of the refrigerant through the high-pressure compressor,
ii) calculate the rate of heat removal from the refrigerated space,
iii) find the COP of this refrigerator, and
iv) Develop a refrigerator operated on a single-stage cycle between the same pressure limits
with the same compressor efficiency and the same flow rate as in part (a).

Science that deals with the amount of energy transferred from one equilibrium state to another equilibrium state.

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