A vapor-compression refrigeration system circulates R-134a at a rate (m_dot) of 10 kg/min . The refrigerant enters the compressor at -10 ∘C∘C, 1.2 bar and exits at 7 bar. The isentropic compressor efficiency is 68%. There are no significant pressure drops as the refrigerant flows through the condenser and evaporator. The refrigerant leaves the condenser at 7 bar and 24 ∘C. Ignore the heat transfer between the compressor and its surroundings. (Figure 1) Part A. Determine the coefficient of performance (COPR) Part B. Determine the refrigerating capacity Part C. a. Determine the irreversibility rates of the compressor for an ambient temperature of 20 ∘C b. Determine the irreversibility rates of the expansion valve for an ambient temperature of 20 ∘C
A vapor-compression refrigeration system circulates R-134a at a rate (m_dot) of 10 kg/min . The refrigerant enters the compressor at -10 ∘C∘C, 1.2 bar and exits at 7 bar. The isentropic compressor efficiency is 68%. There are no significant pressure drops as the refrigerant flows through the condenser and evaporator. The refrigerant leaves the condenser at 7 bar and 24 ∘C. Ignore the heat transfer between the compressor and its surroundings.
(Figure 1)
Part A. Determine the coefficient of performance (COPR)
Part B. Determine the refrigerating capacity
Part C.
a. Determine the irreversibility rates of the compressor for an ambient temperature of 20 ∘C
b. Determine the irreversibility rates of the expansion valve for an ambient temperature of 20 ∘C
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