Low temperature cooling and dehumidification device with reversing airflow defrost for dehumidification and water generation applications where cooling coil inlet air is above freezing

摘要

A low temperature cooling and dehumidification system uses a reverse airflow arrangement to defrost a frosted cooling coil while not interrupting operation. Automatic air dampers are used to reverse the airflow at the proper time to initiate defrost of that section of frosted cooling coil. This system is useful for low temperature cooling and dehumidification in situations where the inlet air is above freezing, however exiting air below freezing can be supplied if desired. It is advantageous for operation if the coolant flow and temperature internal to the cooling coil are regulated to create the conditions for frost formation to begin closer to the air leaving side of the active cooling coil. The dehumidified generated condensate can be collected and used as grey water and/or potable water.

主权项

1. A low temperature cooling and dehumidification system comprising:
a containment containing a cooling coil array comprising a coil through which flows a coolant; an air flow system for directing air through said array for cooling of said air whereby a condensate is formed on an outside surface of said coil; means for removal of a frost formation on said coil by reversing direction of air flow through said array without interrupting cooling and dehumidification or changing direction of flow into and out of said containment; whereby air flow continues during defrosting; and whereby cooling coil airflow is reversed, and the coldest section of the cooling coil becomes the warmest, thereby promoting defrost, while also keeping the energy, given up by melting frost, in the airstream, thereby providing an energy efficient means for defrosting while not interrupting operation; and a plenum under said array for collection of generated condensate.