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 24 tons. Given : h6 = 368 kJ/kg; h2= 420 kJ/kgFind : A) COP?B) heat rejected in the condenser, in KW?C) amount of cooling water needed for a temp rise of 120C. in kg/sD) amount of ice (kg)for a 10 hrs operation if the initial temp of water is 31 0C to ice at --40C. in Kg?

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Answered: A two stage cascade refrigeration…

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 24 tons. Given : h6 = 368 kJ/kg; h2= 420 kJ/kg

Find :

A) COP?

B) heat rejected in the condenser, in KW?

C) amount of cooling water needed for a temp rise of 12⁰C. in kg/s

D) amount of ice (kg)for a 10 hrs operation if the initial temp of water is 31 ⁰C to ice at --4⁰C. in Kg?

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