Question 12.26: A refrigeration system of 10.5 tonnes capacity at an evapora...
A refrigeration system of 10.5 tonnes capacity at an evaporator temperature of – 12°C and a condenser temperature of 27°C is needed in a food storage locker. The refrigerant ammonia is sub-cooled by 6°C before entering the expansion valve. The vapour is 0.95 dry as it leaves the evaporator coil. The compression in the compressor is of adiabatic type.
Using p-h chart find :
(i) Condition of volume at outlet of the compressor
(ii) Condition of vapour at entrance to evaporator
(iii) C.O.P.
(iv) Power required, in kW.
Neglect valve throttling and clearance effect.
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