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.h6 = 366 kJ/kg; h2= 421 kJ/kgDetermine the ff:a.) COPANSWER: 3.0647b.) heat rejected in the condenser,ANSWER: 130.5704 kwc.) amount of cooling water needed for a temp rise of 140C.ANSWER: 2.2258 kg/s

High Pressure loop uses R−12 with following properties Condenser temperature = 30°C Evaporator…

Answered: two stage cascade refrigeration system…

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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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.

h6 = 366 kJ/kg; h2= 421 kJ/kg

Determine the ff:
a.) COP
ANSWER: 3.0647

b.) heat rejected in the condenser,
ANSWER: 130.5704 kw

c.) amount of cooling water needed for a temp rise of 14⁰C.

ANSWER: 2.2258 kg/s

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