Air heat Exchangers for Pre-cooling the Ventilation Air

These heat exchangers uses a series of thin Aluminium plates to transfer heat between two air streams.

Heat Pipes

Heat Pipes (Fig. 3.6) usually consist of a sealed finned tubes with a wick lining on the inside. The tube contains a working liquid that evaporates from the hot end of the tube and condenses on the cold end, so the heat transfer. The working fluid is returned to the hot end by capillary action to the wick. Alternative heat pipe design (no match), working on the lines re boiler is used as well.

Heat Wheels

Heat wheel (Fig. 3.7) is a rotary heat exchangers Packed with aluminium honey comb fill. One half of the wheel is in contact with the warm air, and the other half with cold air. Sensible heat incoming warm air is half fill; as he slowly rotates and moves in the cold half fill it transfers heat in the cold stream. Desiccant coated heat drives are also available; here, in addition to sensible heat transfer, latent heat transfer occurs also as a dehumidifier absorbs moisture..