HVAC Design - Pool Dehumidification

A pool enclosure, by definition, contains a large reservoir of water that acts as a humidifier for the air in the space.  For each pound of water that evaporates from the pool, approximately 1047 Btu is required to vaporize the water.  This heat comes primarily from the pool water and from the air directly above the pool surface, effectively cooling both.   In order to maintain pool temperature and space temperature and humidity at the recommended levels, the air must be constantly dehumidified and heated, and the pool water must also be heated.  A dehumidifier, which works by condensing moisture out of the pool space air, is an efficient and effective way to transfer the heat recovered from the condensation of water vapor (dehumidifying) back into the pool water and the air in the pool space.  Due to the mechanical work of compression in the heat pump compressor, somewhat more heat is delivered back to the pool air and water than is recovered in the dehumidification process. During times (summer) when this additional heat is not needed, an auxiliary outdoor condenser is required to remove the heat from the building but still requiring the compressor to operate. An alternative strategy employs the TBS patent pending E-Max Solar / Geothermal technology that only operates a compressor when heating or cooling is actually required and using outdoor air for dehumidification is an energy conserving alternative that works very well in the northern united states.

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