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PROBLEM 4. (20 POINTS) A cold storage plant is used to cool 9000 liters of milk per hour from 27Â°C to 4Â°C. The heat gain of the plant is estimated at 3600 kJ/min. The refrigerant is ammonia and the temperature required in the evaporator is -6Â°C. The compressor delivery pressure is 10.34 bar and the condenser liquid is undercooled to 24Â°C before throttling. The plant has a brine circulating system and the rise in temperature of the brine is to be limited to 3Â°C. The vapor is dry saturated at the evaporator outlet, and the compression process is isentropic. a) Sketch the system. b) Draw the refrigeration cycle on the p-h diagram provided. c) Calculate: - The power input required in kW, taking the mechanical efficiency of the compressor as 90%. - The swept volume of each cylinder of the twin-cylinder, single-acting compressor, with a volumetric efficiency of 85% and a rotational speed of 200 rpm. - The rate of brine circulation in liters/sec. Milk: specific heat 3.77 kJ/kgÂ·K Brine: specific heat 2.93 kJ/kgÂ·K Density: 1030 kg/mÂ³ (milk), 1190 kg/mÂ³ (brine)

          PROBLEM 4. (20 POINTS)

A cold storage plant is used to cool 9000 liters of milk per hour from 27Â°C to 4Â°C. The heat gain of the plant is estimated at 3600 kJ/min. The refrigerant is ammonia and the temperature required in the evaporator is -6Â°C. The compressor delivery pressure is 10.34 bar and the condenser liquid is undercooled to 24Â°C before throttling. The plant has a brine circulating system and the rise in temperature of the brine is to be limited to 3Â°C. The vapor is dry saturated at the evaporator outlet, and the compression process is isentropic.

a) Sketch the system.
b) Draw the refrigeration cycle on the p-h diagram provided.
c) Calculate:
   - The power input required in kW, taking the mechanical efficiency of the compressor as 90%.
   - The swept volume of each cylinder of the twin-cylinder, single-acting compressor, with a volumetric efficiency of 85% and a rotational speed of 200 rpm.
   - The rate of brine circulation in liters/sec.

Milk: specific heat 3.77 kJ/kgÂ·K
Brine: specific heat 2.93 kJ/kgÂ·K
Density: 1030 kg/mÂ³ (milk), 1190 kg/mÂ³ (brine)

problem 4 20 points a cold storage plant is used to cool 9000 litres of milk per hour from 27c to 4cthe heat gain of the plant is estimated at 3600kjmin the refrigerant is ammonia and the te 51102

Added by Victoria B.

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