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. Given that, h6 = 366 kJ/kg; h2= 421 kJ/kg. Determine the amount of ice (kg)for a 10 hrs operation if the initial temp of water is 31 0C to ice at --80C. ANSWER: 7358.9169 kgA two stage cascade refrigeration system uses R-11 as the working substance. The evaporator is at -30 0C and the high pressure condenser is at 300C. The cascade condenser is a direct contact type. The refrigeration load is 24 tons. Given that, h2 = 393 kJ/kg; h6 = 408 kJ/kg. Determine the ff: a.) amount ofwater for a 10 hrs operation if the initial temp of water is 34 0C to 20C. ANSWER: 22656.8019kg b.) amount of cooling water needed for a temp rise of 130C. ANSWER: 1.9446 c.) heat rejected in the condenser. ANSWER: 105.9228 kw

Solution: Given Data: h6 = 366 kJ/kg; h2= 421 kJ/kg Note: Dear Student! Since you have asked…

Answered: A two stage cascade refrigeration…

Refrigeration and Air Conditioning Technology (MindTap Course List)

8th Edition

ISBN:9781305578296

Author:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson

Publisher:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson

Chapter22: Condensers

Section: Chapter Questions

Problem 7RQ: When a standard-efficiency air-cooled condenser is used, the condensing refrigerant will normally be...

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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. Given that, h6 = 366 kJ/kg; h2= 421 kJ/kg. Determine the amount of ice (kg)for a 10 hrs operation if the initial temp of water is 31 ⁰C to ice at --8⁰C. ANSWER: 7358.9169 kg
A two stage cascade refrigeration system uses R-11 as the working substance. The evaporator is at -30 ⁰C and the high pressure condenser is at 30⁰C. The cascade condenser is a direct contact type. The refrigeration load is 24 tons. Given that, h2 = 393 kJ/kg; h6 = 408 kJ/kg. Determine the ff:

a.) amount ofwater for a 10 hrs operation if the initial temp of water is 34 ⁰C to 2⁰C.

ANSWER: 22656.8019kg

b.) amount of cooling water needed for a temp rise of 13⁰C.

ANSWER: 1.9446

c.) heat rejected in the condenser. ANSWER: 105.9228 kw

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