The ducts of an air heating system pass through an unheated area. as a result of heat losses, the temperature of the air in the duct drops by 3 c. if the mass flow rate of air is 90 kg/min, determine

The ducts of an air heating system pass through an unheated area. as a result of heat losses, the temperature of the air in the duct drops by 3

c. if the mass flow rate of air is 90 kg/min, determine the rate of heat loss from the air to the cold environment. cp =1.007 kj/kg·k and cv= 0.720 kj/kg.k