A reversible air-cooling and dehumidification system operating without refrigerant gases developed by Dais Analytic and undergoing beta testing is projected to reduce energy use and CO2 emissions by over 50%, to have Seasonal Energy Efficiency Ratings (SEER) of over 30.
NanoAir manages this by separating the management of the moisture content in air from that of its temperature thanks to separate sections using special nanotechnological membrane that is air-proof but water-permeable. The first sections, actually a dehumidifier made of such a membrane fitted on an air vacuum, draws the moisture out of the air. The air is then sent to a metal chilled water coil where it is cooled to proper temperature before entering the building. The chiller, connected to the cooling coil via a water loop, operates with a similar membrane, separating a tray full of water, from a vacuum plenum which acts as a heat exchanger via a set of tubes extending into the water. The vacuum draws the warm water molecules from the chiller, through the membrane, allowing the vacuum and tubes to lower the temperature of the water which is then sent back to the coil. The system’s compressor uses a blower in order to draw the water molecules from the chiller and dehumidifier at a higher pressure, to an outdoor enthalpy exchanger where the water vapour evaporates through the nanotechnology, thus rejecting the heat and humidity originally pulled from the inside air.
The system allows for complete decoupling and independent regulation of the air cooler and dehumidifier. It is also entirely reversible as the blower-compressor can also draw moisture into the system, thus causing the dehumidifier to operate as a humidifier and/or the chiller to operate as a heater.