Outside Air Units with Energy Recovery
The DES/DX with energy recovery ventilation (ERV) includes an energy recovery wheel to exchange enthalpy between the exhaust and the outside air prior to the pre-cooling coil. Incorporating the ERV into the DES/DX system tempers the outside air, eliminating significant compressor tonnage and thereby reducing the overall energy consumption considerably. Make-up air is then efficiently dehumidified prior to entering the space.
Outside air is cooled and dehumidified through one or more refrigeration circuits prior to entering the desiccant wheel. The desiccant wheel provides additional dehumidification while returning the air temperature back to space neutral conditions (but much lower %RH). Waste condenser heat is used to reactivate the desiccant wheel.