stream b the first heat exchanger d pre cools the outdoor air b utilising reclaimed energy reducing the dry bulb temperature and commencing the dehumidifying process the second heat exchanger e dehumidifies the outdoor air b to an absolute humidity level that will achieve the desired relative humidity level within the conditioned space the third heat exchanger f reclaims sensible heat that is not required to satisfy the conditioned space sensible cooling load the result of the third stage of heat exchange is a separation of the outdoor air stream b from the saturation curve the amount of separation is regulated by a heat transfer pump i connecting the first heat exchanger d and the third heat exchanger f the principal heat exchange medium in this case again being chilled water is again used to maximize heat exchanger efficiency thus the cold entering flow is used to provide the driving potential for the second heat exchanger e the outdoor air dehumidification heat exchanger and the subsequently warmer water then passes to the heat exchanger h of the return air stream a namely the return air sensible cooling heat exchanger when the outdoor conditions are themselves suitable to provide sensible cooling and dehumidification a return air u201c bypass u201d damper cc can be modulated closed to introduce additional outdoor air.