Abstract: A desiccant dehumidifier is provided in which a desiccant material is applied to a first end of a heat pipe heat exchanger. During the sorption phase, a supply air stream is exposed to the desiccant material on the first end of the heat pipe heat exchanger and a second air stream, which could be ambient atmosphere, is exposed to the second end of the heat pipe heat exchanger. The moisture from the supply air stream is transferred to the desiccant material. However, the heat pipe heat exchanger acts as a heat sink and adsorbs the heat generated by the moisture transfer and transfers it to the second end of the heat pipe heat exchanger. At the second end of the heat pipe heat exchanger, the heat is transferred to the second air stream. As a result, both the supply air stream and the desiccant material remain at a substantially constant temperature during the sorption phase.

Abstract: A double cross counterflow heat exchanger of the continuous plate type is formed of a continuous sheet of heat conductive material folded upon itself on fold regions in opposite directions alternately to define a plurality of substantially parallel, mutually spaced sheet portion, substantially each sheet portion thereby being located between first and second adjacent sheet portions with the fold regions being located at the lengthwise ends of each sheet. Each sheet portion has a pair of edge sections perpendicular to the fold which joins two sheets, the portions of which edge sections, of the two sheets, most distant from the joining fold are sealed together to define a fluid flow channel, each of the channels having first and second fluid transmitting openings located at the sides of each channel, and a third fluid transmitting opening located at the end of each channel opposed to the fold sealing the opposite end of each channel.

Abstract: Packaging systems for gas to gas counter-flow heat exchangers include locating individual heat exchanger modules adjacent to each other within a housing and providing a plurality of plenum chambers partially defined by suitably arranged baffles. The arrangements disclosed provide heat exchanger assemblies wherein the length of fluid flow path is significantly larger than at least one of the width dimensions of the flow stream thus minimizing entrance effects which tend to reduce the efficiency of the system.