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The refrigerant R-134a enters the compressor of a refrigeration machine at a pressure of 140kPa and a temperature of -10°C, and exits at a pressure of 1MPa. The volumetric flow rate of the refrigerant entering the compressor is 0.23m3/minute. The refrigerant enters the throttling valve at 0.95MPa pressure and 30 °C, and exits the evaporator as saturated steam at -18 °C. The adiabatic efficiency of the compressor is 78%. Show the cycle in the T-s diagram. a) The power required to operate the compressor, b) Calculate the heat withdrawn from the cooled environment in unit time, COPsm=? c) Calculate how much the pressure of the refrigerant drops between the evaporator and the compressor and how much the heat gain is

The refrigerant R-134a enters the compressor of a refrigeration machine at a pressure of 140kPa and a temperature of -10°C, and exits at a pressure of 1MPa. The volumetric flow rate of the refrigerant entering the compressor is 0.23m3/minute. The refrigerant enters the throttling valve at 0.95MPa pressure and 30 °C, and exits the evaporator as saturated steam at -18 °C. The adiabatic efficiency of the compressor is 78%. Show the cycle in the T-s diagram. a) The power required to operate the compressor, b) Calculate the heat withdrawn from the cooled environment in unit time, COPsm=? c) Calculate how much the pressure of the refrigerant drops between the evaporator and the compressor and how much the heat gain is

Elements Of Electromagnetics
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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The refrigerant R-134a enters the compressor of a refrigeration machine at a pressure of 140kPa and a temperature of -10°C, and exits at a pressure of 1MPa. The volumetric flow rate of the refrigerant entering the compressor is 0.23m3/minute. The refrigerant enters the throttling valve at 0.95MPa pressure and 30 °C, and exits the evaporator as saturated steam at -18 °C. The adiabatic efficiency of the compressor is 78%. Show the cycle in the T-s diagram.

a) The power required to operate the compressor,

b) Calculate the heat withdrawn from the cooled environment in unit time, COPsm=?

c) Calculate how much the pressure of the refrigerant drops between the evaporator and the compressor and how much the heat gain is

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