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Opportunity #2 – Advanced Rooftop Air-Conditioning Units NREL is tasked, through funding from the DOE Office of Building Technology, to evaluate the performance of advanced cooling concepts that meet or exceed the performance criteria developed by the Western Cooling Efficiency Center (WCEC) (http://wcec.ucdavis.edu/). The WCEC has developed a set of criteria for test conditions, minimum energy, and water use performance for prototype cooling equipment. The WCEC has identified these conditions as indicative of western state climates. These criteria, named the Western Cooling Challenge (WCC), have been set forth as a challenge to manufacturers to improve the state-of-the-art space cooling products. NREL is to verify these criteria through laboratory testing at its HVAC test facility (www.nrel.gov/dtet/lab_capabilities.html) in Golden, Colorado, which is uniquely suited to accurately measure the cooling performance, energy, and water use of advanced cooling systems. The facility provides flexibility to test prototype equipment and develop subsequent test methodology. Data are analyzed and reported to reflect performance at sea level elevation. NREL tested a prototype rooftop unit manufactured by the Coolerado Corporation. The unit, an advanced ultra-cooler that uses the patented “M-cycle” process, is a hybrid indirect evaporative cooling and refrigeration direct expansion system. An airflow schematic of the rooftop unit is shown in Figure 65. Return air and outdoor air are brought into the unit and cooled by an indirect evaporative medium. Between 43% and 46% of this air is used as an indirect evaporative cooling stream. The balance is then passed through a refrigerant evaporator coil and supplied to the space by a high-efficiency fan. The exhaust air from the evaporative process is generally cooler than the ambient air and is therefore used for the heat sink air flow going through the refrigerant condenser coil. Outdoor air and exhaust air flow rates were matched during testing. The return air and supply air flow rates are also equal, thus there is no make-up air to the space supplied by the unit. The mode of operation can be described as recirculation and ventilation air cooling with no makeup air. 165PDF Image | 4th Annual Chena Renewable Energy Fair
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