An ideal vapor-compression cycle uses R-134a as the working fluid. Recall that the compressor receives refrigerant from the evaporator at Pevap then delivers refrigerant to the condenser at some higher pressure, Pcond. It is also important to know that the condenser and evaporator operate isobarically. For the refrigeration system of interest here, the evaporator and condenser operate at 1.4 bar and 9 bar, respectively. The refrigerant enters the compressor at -10°C (state 1) and exits the condenser (state 3) at 32°C. The compressor operates adiabatically and steadily consumes 4.8 kW of power. The mass flow rate of the refrigerant through the cycle is 7 kg/min. a) What is the exit temperature of the refrigerant out of the compressor? b) The expansion valve is a throttling device. The outlet pressure of the throttling valve is the same as the inlet pressure of the evaporator. What is the quality of the refrigerant at the exit of the expansion valve (state 4)? c) What is the rate of heat transfer into the refrigerant as it flows through the evaporator?

An ideal vapor-compression cycle uses R-134a as the working fluid. Recall that the compressor receives refrigerant from the evaporator at Pevap then delivers refrigerant to the condenser at some higher pressure, Pcond. It is also important to know that the condenser and evaporator operate isobarically. For the refrigeration system of interest here, the evaporator and condenser operate at 1.4 bar and 9 bar, respectively. The refrigerant enters the compressor at -10°C (state 1) and exits the condenser (state 3) at 32°C. The compressor operates adiabatically and steadily consumes 4.8 kW of power. The mass flow rate of the refrigerant through the cycle is 7 kg/min. a) What is the exit temperature of the refrigerant out of the compressor? b) The expansion valve is a throttling device. The outlet pressure of the throttling valve is the same as the inlet pressure of the evaporator. What is the quality of the refrigerant at the exit of the expansion valve (state 4)? c) What is the rate of heat transfer into the refrigerant as it flows through the evaporator?

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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An ideal vapor-compression cycle uses R-134a as the working fluid. Recall that the compressor receives
refrigerant from the evaporator at Pevap then delivers refrigerant to the condenser at some higher
pressure, Pcond. It is also important to know that the condenser and evaporator operate isobarically. For
the refrigeration system of interest here, the evaporator and condenser operate at 1.4 bar and 9 bar,
respectively. The refrigerant enters the compressor at −10°C (state 1) and exits the condenser (state 3) at
32°C. The compressor operates adiabatically and steadily consumes 4.8 kW of power.
The mass flow rate of the refrigerant through the cycle is 7 kg/min.
a) What is the exit temperature of the refrigerant out of the compressor?
b)
The expansion valve is a throttling device. The outlet pressure of the throttling valve is the same
as the inlet pressure of the evaporator. What is the quality of the refrigerant at the exit of the
expansion valve (state 4)?
c) What is the rate of heat transfer into the refrigerant as it flows through the evaporator?

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The figure below shows a two-stage vapor-compression refrigeration system with ammonia as the working fluid. The system uses a direct-contact heat exchanger to achieve intercooling. The evaporator has a refrigerating capacity of 40 tons and produces -30°F saturated vapor at its exit. In the first compressor stage, the refrigerant is compressed adiabatically to 140 lbf/in.², which is the pressure in the direct contact heat exchanger. Saturated vapor at 140 lbf/in.² enters the second compressor stage and is compressed adiabatically to 250 lbf/in.² Each compressor stage has an isentropic efficiency of 85%. There are no significant pressure drops as the refrigerant passes through the heat exchangers. Saturated liquid enters each expansion valve. Determine: Expansion valve 6- Condenser Direct contact heat exchanger Expansion valve (a) the ratio of mass flow rates, m3/my. (b) the power input to each compressor stage, in horsepower. (c) the coefficient of performance Comp Comp Evaporator
Cold storage uses R134a, the evaporator temperature is -7C and the condenser temperature is 32C. The cooling load is 5.3103 kJ/min. The cycle is ideal. Determine: 1. Mass flowrate of the refrigerant. 2. Coefficient of Performance (COP). - If the water condenser is used that enter at 24C and exit at 30C. determine the water flowrate.
Complete work
Working fluid is Refrigerant 134a. Vapor-compression refrigeration system has refrigerating capacity = 1650 Btu/hour. Refrigerant enters evaporator at -10F and leaves at 15F. Isentropic compressor efficiency = 74%. Refrigerant condenses at 140F and leaves condenser subcooled at 100F. No large pressure drops through evaporator and condenser. DETERMINE: 1. Pressure of evaporator in lbf/in^2 2. Pressure of condenser in lbf/in^2 3. Mass flow rate in lb/s of refrigerant 134a. 4. Power input in horsepower of compressor. 5. Coefficient of performance.