Wire-on-tube heat exchangers are more often used by refrigerator manufacturers as ondensers mainly due to their simple construction, ruggedness, and low cost. This type of heat exchanger consists of a single steel tube, bent into serpentine parallel passes carrying the 5uid, mainly refrigerant and solid steel wires are attached to the tube to increase the surface area. The solid wires are spot welded on to diametrically opposite sides of the tubes as shown in Fig. 1. The refrigerant enters the tube in a vapour state and leaves the condenser in a liquid state undergoing a phase change. The heat transfer takes place from the outer surfaces of the wires and tubes

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