A cold storage plant is used to cool 9000 liters of milk per hour from 27...
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A cold storage plant is used to cool 9000 liters of milk per hour from 27 °C to 4 °C, and the heat leakage into the plant is estimated to be 60 kW. The refrigerant used is R134a and the temperature required in the evaporator is -6 °C. The compressor delivery pressure is six times the evaporator pressure. The condenser liquid is undercooled to 40 °C before throttling. The condenser is cooled using water for which the temperature difference is limited to 7 °C. Assuming that the vapor is saturated when leaving the evaporator and that the compression process is isentropic, evaluate: a. The mass flow rate of the refrigerant in kg/s b. The power input required taking the mechanical efficiency of the compressor as 90%. c. The COP of the cycle and that of the plant. d. The rate at which the water should be circulated in liters per hour. N.B. Take the enthalpy of the refrigerant at the evaporator exit and the compressor outlet as h1 = 246.9 and h2= 284.3 kj/kg respectively. Consider that the specific heat and density of milk are 3.77 kJ/kg K and 1030 kg/m³. A cold storage plant is used to cool 9000 liters of milk per hour from 27 °C to 4 °C, and the heat leakage into the plant is estimated to be 60 kW. The refrigerant used is R134a and the temperature required in the evaporator is -6 °C. The compressor delivery pressure is six times the evaporator pressure. The condenser liquid is undercooled to 40 °C before throttling. The condenser is cooled using water for which the temperature difference is limited to 7 °C. Assuming that the vapor is saturated when leaving the evaporator and that the compression process is isentropic, evaluate: a. The mass flow rate of the refrigerant in kg/s b. The power input required taking the mechanical efficiency of the compressor as 90%. c. The COP of the cycle and that of the plant. d. The rate at which the water should be circulated in liters per hour. N.B. Take the enthalpy of the refrigerant at the evaporator exit and the compressor outlet as h1 = 246.9 and h2= 284.3 kj/kg respectively. Consider that the specific heat and density of milk are 3.77 kJ/kg K and 1030 kg/m³.
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Milk is cooled from 27C to 4C So temperature difference 27 4 23C Mass of milk cooled per hour 9000 l... View the full answer
Related Book For
Thermodynamics for Engineers
ISBN: ?978-1133112860
1st edition
Authors: Kenneth A. Kroos, Merle C. Potter
Posted Date:
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