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This leads to distinct optimization advantages, including cheaper desiccant materials and a small cooling core. The novel design uses membrane technology to contain liquid desiccant and water. When used to contain liquid desiccant, it eliminates desiccant entrainment into the airstream. When used to contain water, it eliminates wet surfaces, prevents bacterial growth and mineral buildup, and avoids cooling core degradation. DEVap’s thermodynamic potential overcomes many shortcomings of standard refrigeration- based direct expansion cooling. DEVap decouples cooling and dehumidification performance, which results in independent temperature and humidity control. The energy input is largely switched away from electricity to low-grade thermal energy that can be sourced from fossil fuels such as natural gas, waste heat, solar, or biofuels. Thermal energy consumption correlates directly to the humidity level in the operating environment. Modeling at NREL has shown that the yearly combined source energy for the thermal and electrical energy required to operate DEVap is expected to be 30% – 90% less than state-of the-art direct expansion cooling (depending on whether it is applied in a humid or a dry climate). Furthermore, desiccant technology is a new science with unpracticed technology improvements that can reduce energy consumption an additional 50%. And unlike most HVAC systems, DEVap uses no environmentally harmful fluids, HFCs, or chlorofluorocarbons; instead, it uses water and concentrated salt water. Applicable DOD Market: All commercial DOD buildings in humid climates with significant dehumidification requirements. This cooling strategy has the potential to drastically reduce cooling energy use in humid climates. Energy Savings Potential: Modeling at NREL has shown that the yearly combined source energy for the thermal and electrical energy required to operate DEVap is expected to be 30% – 90% less than state- of-the-art direct expansion cooling (depending on whether it is applied in a humid or a dry climate). Potential Commercialization Date: 1-Ton Prototype – 2011, full commercialization occurring in 2012 or beyond Contact information: Eric Kozubol, 303-384-6155, eric.kozubal@nrel.gov Demonstration Potential: 5 The demonstration potential for this technology was ranked high based on the revolutionary approach to space cooling and the need for field testing to prove the commercial validity of the product. 164PDF Image | 4th Annual Chena Renewable Energy Fair
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