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
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