Experimental study and CFD analysis of heat recovery system for Window air conditioning

The heat recovery duct of Window air-conditioning unit is simulate to recover the waste heat from the condenser and uses the same for drying the kitchen food waste. The combination of convergent and square duct is used for heat recovery. The artificial roughness is created on the heat transfer surface to enhance the heat transfer. The ribs were attached to the wall perpendicular to the direction of flow. The local heat transfer and pressure drop characteristics of hot air through plain and ribbed duct have been investigated by experimentally as well as numerically for Reynolds number of 42,305. The numerical thermal performance of heat recovery system for plain and ribbed duct has been compared with that of the experimental. The comparison shows that, because of the ribs the thermal performance of the system is increases by 28%.