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A heat pump based on the vapor-compression refrigeration cycle uses R-134a as the working fluid. The heat pump operates in 5°C surroundings, and the heat pump is used to heat a 0.6 kg/s stream of air from 5°C to 35°C. The condenser pressure is 1.2 MPa, the evaporator pressure is 200 kPa, and the isentropic compressor efficiency is 85%. a) Find the actual enthalpy and temperature of the R-134a exiting the compressor (answers: 288.49 kJ/kg and 59.0°C). b) Find the coefficient of performance of the heat pump (answer: 3.88). c) Find the power input required to drive the compressor (answer: 4.67 kW). Use Cengel's R-134a tables posted on Canvas to model the refrigerant. TIN = 5°C Expansion Valve MAIR = 0.6 kg/s→→→→→→ QCONDENSER Condenser 1.2 MPa Evaporator 200 kPa QEVAPORATOR 5°C Surroundings TOUT = 35°C Compressor W COMPRESSOR

A heat pump based on the vapor-compression refrigeration cycle uses R-134a as the working fluid. The heat pump operates in 5°C surroundings, and the heat pump is used to heat a 0.6 kg/s stream of air from 5°C to 35°C. The condenser pressure is 1.2 MPa, the evaporator pressure is 200 kPa, and the isentropic compressor efficiency is 85%. a) Find the actual enthalpy and temperature of the R-134a exiting the compressor (answers: 288.49 kJ/kg and 59.0°C). b) Find the coefficient of performance of the heat pump (answer: 3.88). c) Find the power input required to drive the compressor (answer: 4.67 kW). Use Cengel's R-134a tables posted on Canvas to model the refrigerant. TIN = 5°C Expansion Valve MAIR = 0.6 kg/s→→→→→→ QCONDENSER Condenser 1.2 MPa Evaporator 200 kPa QEVAPORATOR 5°C Surroundings TOUT = 35°C 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 operates in 5°C surroundings, and the heat pump is used to heat a 0.6 kg/s stream of air from 5°C to 35°C. The condenser pressure is 1.2 MPa, the evaporator pressure is 200 kPa, and the isentropic compressor efficiency is 85%. a) Find the actual enthalpy and temperature of the R-134a exiting the compressor (answers: 288.49 kJ/kg and 59.0°C). b) Find the coefficient of performance of the heat pump (answer: 3.88). c) Find the power input required to drive the compressor (answer: 4.67 kW). Use Cengel's R-134a tables posted on Canvas to model the refrigerant. TIN = 5°C Expansion Valve MAIR = 0.6 kg/s→→→→→ QCONDENSER Condenser 1.2 MPa Evaporator 200 kPa 5°C Surroundings 1 EVAPORATOR TOUT = 35°C Compressor COMPRESSOR
Transcribed Image Text:A heat pump based on the vapor-compression refrigeration cycle uses R-134a as the working fluid. The heat pump operates in 5°C surroundings, and the heat pump is used to heat a 0.6 kg/s stream of air from 5°C to 35°C. The condenser pressure is 1.2 MPa, the evaporator pressure is 200 kPa, and the isentropic compressor efficiency is 85%. a) Find the actual enthalpy and temperature of the R-134a exiting the compressor (answers: 288.49 kJ/kg and 59.0°C). b) Find the coefficient of performance of the heat pump (answer: 3.88). c) Find the power input required to drive the compressor (answer: 4.67 kW). Use Cengel's R-134a tables posted on Canvas to model the refrigerant. TIN = 5°C Expansion Valve MAIR = 0.6 kg/s→→→→→ QCONDENSER Condenser 1.2 MPa Evaporator 200 kPa 5°C Surroundings 1 EVAPORATOR TOUT = 35°C Compressor COMPRESSOR
Expert Solution
Step 1

Given that, working fluid of the heat pump cycle is R134a.

Condenser pressure is 1.2 MPa and evaporator pressure is 200 kPa.

Isentropic efficiency of the compressor is 85 %.

Mass flow rate of air is 0.6 kg/s. Air enters at 5 oC and 35 oC.

It is required to determine:

(a) Actual specific enthalpy and temperature at the end of compression process.

(b) The coefficient of performance of the heat pump cycle.

(c) The power output required to drive the compressor.

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