two-stage cascade refrigeration system uses ammonia as the working substance. The evaporator is at -35°C and the high-pressure condenser is at 1514.2 kPa. The cascade condenser is a direct-contract type. The refrigeration load is 90 tons. Determine (a) the mass flow rate in the low-pressure loop, (b) the mass flow rate in the high-pressure loop, (c) the power required, (d) the COP, and (e) the quantity of the fluid entering the evaporator. Ans. (a) 0.2572 kg/s, (b) 0.341 kg/s,

Elements Of Electromagnetics
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a two-stage cascade refrigeration system uses ammonia as the working substance. The evaporator is at -35°C and the high-pressure condenser is at 1514.2 kPa. The cascade condenser is a direct-contract type. The refrigeration load is 90 tons. Determine (a) the mass flow rate in the low-pressure loop, (b) the mass flow rate in the high-pressure loop, (c) the power required, (d) the COP, and (e) the quantity of the fluid entering the evaporator. Ans. (a) 0.2572 kg/s, (b) 0.341 kg/s,- (c) 116.08 kW, (d) 2.73, (e) 10.37%

show also how all enthalpy and pressure get. please

 

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