Refrigerant R-134a enters to the compressor of a refrigeration machine at a pressure of 140 kPa and a temperature of -10 °C, then comes out at a pressure of 1 MPa . Volumetric flow of the refrigerant entering the compressor 0.23 m3 /minute. Refrigerant enters throttling valve at 0.95 MPa pressure and 30 °C, and comes out the evaporator at -18 °C as saturated steam. Adiabatic efficiency of the compressor It is 78%. Show the cycle in the T-s diagram. Then calculate: a) Power required to run the compressor b) The heat withdrawn from the cooled environment in unit time, COPsm=? c)Between the evaporator and the compressor, pressure drop of the refrigerant and its heat gain.
Refrigerant R-134a enters to the compressor of a refrigeration machine at a pressure of 140 kPa and a temperature of -10 °C, then comes out at a pressure of 1 MPa . Volumetric flow of the refrigerant entering the compressor 0.23 m3 /minute. Refrigerant enters throttling valve at 0.95 MPa pressure and 30 °C, and comes out the evaporator at -18 °C as saturated steam. Adiabatic efficiency of the compressor It is 78%. Show the cycle in the T-s diagram. Then calculate: a) Power required to run the compressor b) The heat withdrawn from the cooled environment in unit time, COPsm=? c)Between the evaporator and the compressor, pressure drop of the refrigerant and its heat gain.
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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Refrigerant R-134a enters to the compressor of a refrigeration machine at a pressure of 140 kPa and a temperature of -10 °C, then comes out at a pressure of 1 MPa . Volumetric flow of the refrigerant entering the compressor 0.23 m3 /minute. Refrigerant enters throttling valve at 0.95 MPa pressure and 30 °C, and comes out the evaporator at -18 °C as saturated steam. Adiabatic efficiency of the compressor It is 78%. Show the cycle in the T-s diagram. Then calculate:
a) Power required to run the compressor
b) The heat withdrawn from the cooled environment in unit time, COPsm=?
c)Between the evaporator and the compressor, pressure drop of the refrigerant and its heat gain.
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