Answer to Question #310561 in Mechanical Engineering for Jhonny

Question

12. A 120 tons refrigeration system with COP of 5 has a condenser which is to be cooled by means of a cooling tower. Air enters the tower at 25oC db and 50% RH and leaves at 35oC db and 80% RH. Find the volume of air needed m3/hr. At 25oC and 50% RH: h = 50 KJ/kg, v = 0.86 m3/kg At 350C db and 80% RH: h = 108

Answer 1

Volume of air

The refrigerant enters the condenser as gas and leaves as liquid and the opposite occurs in the evaporator. But if you want the mass flow rate it is around 12.8 - 13.5 lbm/hr for an 18 cu ft refrigerator.