| 摘要 |
The hot, saturated air is moved from a drying oven chamber through a substantially closed circuit first in a heat extraction path through a series of cooling stages to condense the solvent from the air, and then in a heat collection path in a cross-flow heat exchange relationship through some of the cooling stages to recover some of the heat, and the dried air is moved back into the drying oven. The heat extraction path extends generally in a downward sloped direction toward a solvent storage tank, and the solvent is condensed as it reaches the lower end of the path. A compound, multiple stage refrigeration system moves a first refrigerant fluid through a condenser coil in the heat collection path to impart heat to the air and then through an expansion valve and through a refrigerant-to-refrigerant heat exchanger to absorb heat, and moves a second refrigerant fluid through the refrigerant-to-refrigerant heat exchanger to give up its heat and then through an expansion valve and through an evaporator in the heat extraction path to absorb heat from the air. Makeup air to the substantially closed system can be provided and moves through a cooling coil and a desiccant dehumidifier in the heat collection path.
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