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.

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Question

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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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