A two stage cascade refrigeration system uses R-12 in the high pressure loop with a condenser temperature of 300C and -100C in the cascade condenser, and R-22 in the low pressure loop with a temperature in the cascade condenser of 00C and an evaporator temperature of -30 0C. The refrigeration load is 28 tons. Given : h6 = 366 kJ/kg; h2= 421 kJ/kg Determine: 1) the mass flow rate in the low pressure loop in kg/s 2) mass flow rate in the high pressure loop, in kg/s 3) total power requirement in KW
A two stage cascade refrigeration system uses R-12 in the high pressure loop with a condenser temperature of 300C and -100C in the cascade condenser, and R-22 in the low pressure loop with a temperature in the cascade condenser of 00C and an evaporator temperature of -30 0C. The refrigeration load is 28 tons. Given : h6 = 366 kJ/kg; h2= 421 kJ/kg
Determine:
1) the mass flow rate in the low pressure loop in kg/s
2) mass flow rate in the high pressure loop, in kg/s
3) total power requirement in KW
4.) COP
5.) heat rejected in the condenser, KW
6.) amount of cooling water needed for a temp rise of 140C. in kg/s
7.) amount of ice (kg)for a 10 hrs operation if the initial temp of water is 31 0C to ice at -80C. Answe in kg.
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