A refrigerated room is kept at -35°C by a vapor-compression cycle with R-134a as the refrigerant. Heat is rejecte to cooling water that enters the condenser at 16°C at a rate of 0.45 kg/s and leaves 26°C. The refrigerant enter the condenser at 1.2 MPa and 50°C and leaves at the same pressure sub-cooled by 5°C. If the compresso consumes 74 kW of power, determine (a) the mass flow rate of the refrigerant, (b) the refrigerant load, (c) the coefficient of performance and, (d) the minimum power input to the compressor for the same refrigerant load.
A refrigerated room is kept at -35°C by a vapor-compression cycle with R-134a as the refrigerant. Heat is rejecte to cooling water that enters the condenser at 16°C at a rate of 0.45 kg/s and leaves 26°C. The refrigerant enter the condenser at 1.2 MPa and 50°C and leaves at the same pressure sub-cooled by 5°C. If the compresso consumes 74 kW of power, determine (a) the mass flow rate of the refrigerant, (b) the refrigerant load, (c) the coefficient of performance and, (d) the minimum power input to the compressor for the same refrigerant load.
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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REFRIGERATION ENGINEERING (!)
USE SHAPIRO AND MORAN TABLE
Transcribed Image Text:3. A refrigerated room is kept at -35°C by a vapor-compression cycle with R-134a as the refrigerant. Heat is rejected
to cooling water that enters the condenser at 16°C at a rate of 0.45 kg/s and leaves 26°C. The refrigerant enters
the condenser at 1.2 MPa and 50°C and leaves at the same pressure sub-cooled by 5°C. If the compressor
consumes 74 kW of power, determine (a) the mass flow rate of the refrigerant, (b) the refrigerant load, (c) the
coefficient of performance and, (d) the minimum power input to the compressor for the same refrigerant load.
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