How do desiccant dehumidifiers use waste heat in a CHP system?
Desiccant materials can be heated to remove water vapor from them. This is done in a practical application by building the desiccant into a wheel that rotates through the building supply and exhaust air. For example, supply air being brought into a building is passed through the left side of the wheel where it absorbs water vapor. Exhaust air is heated and blown through the right side of the wheel and then vented outdoors removing water vapor from the desiccant. The wheel is rotated slowly so the desiccant passes through both supply and exhaust air flows. Steam or hot water from a HRSG can be used to provide the heat needed to heat the exhaust air and regenerate the desiccant.
