Determine the mass flow rate of the refrigerant

Reference no: EM131348241

A small, two-stage, vapor-compression refrigeration unit using R-134a produces 15.0 tons of refrigeration with an evaporator pressure of 100. kPa and a condenser pressure of 1200. kPa. The intermediate flash chamber operates at 400. kPa and the isentropic efficiencies of the compressors in each loop are both 89.0%. The following operating specifications have been developed for the stages (loops):

Stage (Loop) A

Station 1A Compressor A inlet	Station 2sA Compressor A outlet	Station 3A Condenser A outlet	Station 4hA Expansion valve A outlet
P_1A = 400.kPa	P_2sA = 1200.kPa	X_3A = 0.00	H_4hA = h_3A
	S_2sA = S_1A	P_3A = 1200.kPa

Stage (Loop) B

Station 1B Compressor B inlet	Station 2sB Compressor B outlet	Station 3B Condenser B outlet	Station 4hB Expansion valve B outlet
X_1B = 1.00	P_2sB = 400.kPa	X_3B = 0.00	H_4hB = h_3B
P1B = 100.0kPa	S_2sB = S_1B	P_3B = 400.kPa

For this design, determine

a. The mass flow rate of the refrigerant.

b. The system's coefficient of performance.

c. The total power required by the compressor.

Reference no: EM131348241

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