A 9.5 tonnes capacity of ammonia refrigerator operates between evaporator and condenser temperature of -13°C and 28°C is needed in a food storage locker. The refrigerant is sub-cooled by 4°C before entering the expansion valve. The vapour is 0.90 dry as it leaves the evaporator coil. The compression in the compressor is adiabatic type.

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
Chapter48: Cooling Towers And Pumps
Section: Chapter Questions
Problem 2RQ: The typical difference in temperature between the cooling tower water supplied to the condenser and...
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9. A 9.5 tonnes capacity of ammonia refrigerator operates between evaporator and
condenser temperature of -13°C and 28°C is needed in a food storage locker. The
refrigerant is sub-cooled by 4°C before entering the expansion valve. The vapour is
0.90 dry as it leaves the evaporator coil. The compression in the compressor is
adiabatic type.
Using p-h chart find
(i)
Condition of vapour at outlet of the compressor
(ii)
Condition of vapour at entrance to evaporator
(iii)
С.О.Р.
(iv)
Power required in kW
Neglect valve throttling and clearance effect.
Transcribed Image Text:9. A 9.5 tonnes capacity of ammonia refrigerator operates between evaporator and condenser temperature of -13°C and 28°C is needed in a food storage locker. The refrigerant is sub-cooled by 4°C before entering the expansion valve. The vapour is 0.90 dry as it leaves the evaporator coil. The compression in the compressor is adiabatic type. Using p-h chart find (i) Condition of vapour at outlet of the compressor (ii) Condition of vapour at entrance to evaporator (iii) С.О.Р. (iv) Power required in kW Neglect valve throttling and clearance effect.
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