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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 28 tons. Given that, h2 = 391 kJ/kg; h6 = 407 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-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 28 tons. Given that, h2 = 391 kJ/kg; h6 = 407 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

Refrigeration and Air Conditioning Technology (MindTap Course List)
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-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 28 tons. Given that, h2 = 391 kJ/kg; h6 = 407 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 130C. in kg/s

7.) amount of ice (kg)for a 10 hrs operation if the initial temp of water is 34 0C to ice at 40C. Answer in kg.

 

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