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A heat pump based on the vapor-compression refrigeration cycle uses R-134a as the working fluid. The heat pump is used to heat a 1000 SCFM stream of air from 40°F to 90°F. The condenser pressure is 160 psia, the evaporator pressure is 30 psia, and the isentropic efficiency of the compressor is 85%. a) Find the enthalpy of the R-134a exiting the compressor (answer: 122.98 Btu/lbm). b) Find the coefficient of performance of the heat pump (answer: 4.22). c) Find the power input required to drive the compressor (answer: 5.05 hp). A volumetric flow rate in SCFM (standard cubic feet per minute) is converted into a mass flow rate by assuming a density of air at 68°F and 14.696 psia. Use Cengel's R-134a tables posted on Canvas to model the refrigerant. TIN = 40°F Expansion Valve 3 1000 SCFM QCONDENSER 2 Condenser 160 psia Evaporator 30 psia EVAPORATOR TOUT = 90°F Compressor W COMPRESSOR

A heat pump based on the vapor-compression refrigeration cycle uses R-134a as the working fluid. The heat pump is used to heat a 1000 SCFM stream of air from 40°F to 90°F. The condenser pressure is 160 psia, the evaporator pressure is 30 psia, and the isentropic efficiency of the compressor is 85%. a) Find the enthalpy of the R-134a exiting the compressor (answer: 122.98 Btu/lbm). b) Find the coefficient of performance of the heat pump (answer: 4.22). c) Find the power input required to drive the compressor (answer: 5.05 hp). A volumetric flow rate in SCFM (standard cubic feet per minute) is converted into a mass flow rate by assuming a density of air at 68°F and 14.696 psia. Use Cengel's R-134a tables posted on Canvas to model the refrigerant. TIN = 40°F Expansion Valve 3 1000 SCFM QCONDENSER 2 Condenser 160 psia Evaporator 30 psia EVAPORATOR TOUT = 90°F Compressor W COMPRESSOR

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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A heat pump based on the vapor-compression refrigeration cycle uses R-134a as the working fluid. The heat pump is used to heat a 1000 SCFM stream of air from 40°F to 90°F. The condenser pressure is 160 psia, the evaporator pressure is 30 psia, and the isentropic efficiency of the compressor is 85%. a) Find the enthalpy of the R-134a exiting the compressor (answer: 122.98 Btu/lbm). b) Find the coefficient of performance of the heat pump (answer: 4.22). c) Find the power input required to drive the compressor (answer: 5.05 hp). A volumetric flow rate in SCFM (standard cubic feet per minute) is converted into a mass flow rate by assuming a density of air at 68°F and 14.696 psia. Use Cengel's R-134a tables posted on Canvas to model the refrigerant. TIN = 40°F Expansion Valve 3 1000 SCFM QCONDENSER Condenser 160 psia Evaporator 30 psia QEVAPORATOR TOUT = 90°F Compressor W COMPRESSOR
Transcribed Image Text:A heat pump based on the vapor-compression refrigeration cycle uses R-134a as the working fluid. The heat pump is used to heat a 1000 SCFM stream of air from 40°F to 90°F. The condenser pressure is 160 psia, the evaporator pressure is 30 psia, and the isentropic efficiency of the compressor is 85%. a) Find the enthalpy of the R-134a exiting the compressor (answer: 122.98 Btu/lbm). b) Find the coefficient of performance of the heat pump (answer: 4.22). c) Find the power input required to drive the compressor (answer: 5.05 hp). A volumetric flow rate in SCFM (standard cubic feet per minute) is converted into a mass flow rate by assuming a density of air at 68°F and 14.696 psia. Use Cengel's R-134a tables posted on Canvas to model the refrigerant. TIN = 40°F Expansion Valve 3 1000 SCFM QCONDENSER Condenser 160 psia Evaporator 30 psia QEVAPORATOR TOUT = 90°F Compressor W COMPRESSOR
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