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Air enters the compressor of a Brayton refrigeration cycle at 1 atm, 480°R, with a volumetric flow rate of 50 ft³/s. The compressor and turbine each have an isentropic efficiency of 80%. The air is modeled as an ideal gas. If the compressor pressure ratio is 3 and the turbine inlet temperature is 540°R, determine (a) the net power input, in Btu/min, (b) the refrigeration capacity, in Btu/min, (c) the coefficient of performance. 540 R Turbine Heat exchanger Heat exchanger lin 2s Compressor (AV)₁ = 50 ft³/s T₁ = 480°R P₁ = 1 atm cycle 4s p=3 atm 7₁ = 540°R p=1 atm 4 28 11 T₁ = 480°R
1. Refrigerant 134a is the working fluid in a vapor-compression refrigeration cycle that communicates thermally with a cold region at 0°C and a warm region at 26°C. Saturated vapor enters the compressor at -10°C and saturated liquid leaves the condenser at 30°C and a pressure of 9 bar. The compressor operates adiabatically with an isentropic efficiency of 80%. The mass flow rate of the refrigerant is 0.08 kg/s. Determine for the modified cycle (a) the compressor power, in kW, (b) the refrigeration capacity, in tons, (c) the coefficient of performance, and (d) the rates of exergy destruction within the compressor and expansion valve, in kW, for To = 299 K (26°C). Warm region TH-26°C - 299 K Expansion valve Condenser Compressor Evaporator Cold region Te=0°C = 273 K 30°C -10°C 2 P₂ = 9 bar I -To-26°C-299 K
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