What would the answer in part (b) and (c) be if the mass flow rate were doubled?. Input to the compressor, (d) the rate of heat rejection to the environment and Determine (b) the rate of heat removal from The massįlow rate of the refrigerant is 0.04 kg/s. Vapor-compression refrigeration cycle between 0.15 MPa and 0.8 MPa. For a cooling capacity of 20 kW, determine (a) the mass flow rate, (b) theĬompressor power in kW and (c) the coefficientĪnswers: (a) 0.1397 kg/s, (b) 4.31 kW, (c) 4.64Ī refrigerator uses R-12 as the working fluid and operates on an ideal Refrigerant R-134a enters the compressor of an ideal vapor-compression refrigeration systemĪs saturated vapor at -10 oC and leaves the condenser as saturated liquid at 35 oC. For a cooling load of 10 kW, determine the mass flow rate of the refrigerant through the evaporator. Vapor-compression refrigeration cycle between 0.15 MPa and 1 MPa. What would the COP be if R-12 were replaced with R-134a, a moreĪnswers: (a) 1.165 tons, (b) 1.36 kW, (c) 3.01, (d) 3.33Ī refrigerator uses R-134a as the working fluid and operates on an ideal If the mass flow rate isĠ.04 kg/s, determine (a) the tonnage of the system, (b) compressor power and Performance, (c) the quality at the beginning of the heat-absorption process andĪnswers: (b) 7.42, (c) 0.22, (d) 20.99 kW,Ī refrigerator uses R-12 as the working fluid operates on an ideal vaporĬompression refrigeration cycle between 0.15 MPa and 1 MPa. (a) Show the cycle onĪ T-s diagram relative to saturation lines, determine (b) the coefficient of The heat absorptionįrom the refrigerated space takes place at a pressure of 30 psia and the mass flow rate is 1 kg/s. Saturated vapor at 100 psia, and it leaves as saturated liquid. Refrigerant R-134a enters the condenser of a steady-flow Carnot refrigerator as a Performance, (c) the amount of heat absorbed from the refrigerated space and (d) the On T-s diagram relative to saturation lines, determine (b) the coefficient of The refrigerant changes from saturated vapor to saturated liquid at 30 oC Calculate (a) the compressor and turbine power, in Btu/minĪnswers: (a) 9993.44 btu/min 1679.28 btu/min, (b) 5.59Ī steady-flow Carnot refrigeration cycle uses refrigerant-134a as the working fluid. Refrigerant R-134a enters the condenserĪs saturated vapor at 100 lbf/in 2 and leaves as saturated liquid at the For (a) R-12, (b) R-134a, (c) water, (d) R-22Īnd (e) ammonia as the working fluid, determine the operating pressures in the condenserĪnd evaporator, in lbf/in 2, and the coefficient of performance.Īnswers: (a) 131.83 lbf/in 2 51.64 lbf/in 2 8.3, (b) 138.87 lbf/in 2 49.87 lbf/in 2 8.3, (c) 0.95 lbf/in 2 0.12 lbf/in 2 8.3 (d) 210.54 lbf/in 2 83.15 lbf/in 2 8.3 (e) 211.86 lbf/in 2 73.28 lbf/in 2 8.3Ī Carnot vapor refrigeration cycle is used to maintain a cold region at 0 oF
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What would the answer in part (a) be if the mass flow rate were 1 kg/min?Īnswers: (a) 9.70 kW, (b) 1.42 kW, (c) 6.83, (d) 2.43 kWĪ Carnot vapor refrigeration cycle operates between thermal reservoirs at 40 oFĪnd 100 oF. Passing through the evaporator, (b) the net power input to the cycle in kW and
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Determine (a) the rate of heat transfer to the refrigerant
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Saturated vapor enters the condenser atĤ0 oC, and saturated liquid exits at the same temperature. Refrigerant R-22 is the working fluid in a Carnot vapor refrigeration cycle for which theĮvaporator temperature is 0 oC. Refrigerant passing through the evaporator and (d) the coefficient of performance of the cycle? (e) What-if-scenario: The evaporator operates at a temperature of -5 oC.ĭetermine, in kJ per kg of refrigerant flow, (a) the work input to theĬompressor, (b) the work developed by the turbine, (c) the heat transfer to the Refrigerant enters the condenser as saturated vapor at 30 oC and leaves as Section-1: Basic and Modified Vapor Compression CyclesĪ Carnot vapor refrigeration cycle uses R-134a as the working fluid.