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Federal Technology Alert Fig. 12. Heat recovery by the HRU at a water flow rate of 4.3 m3/h (19 gpm). (Source: “Integration of Distributed Energy Resources and Thermally-Activated Technologies,” DistribuTech Conference, Miami Beach, FL, February 2002.) unit and an indirect-fired (hot water) desiccant unit. Both configurations used the 30-kW microturbine as the DG source. These tests investigated the performance of the desiccant dehumidi fication units as one of the components of an IES. The desiccant unit perfor mance parameters of most interest were the latent capacity (LC) and the latent coefficient of performance (LCOP). The LCOP is a measure of the desiccant dehumidification unit’s efficiency and is calculated as the ratio of the LC to the total energy input (thermal + electrical), including the gas input, which is based on HHV of the gas and electrical parasitics (desiccant wheel motor, fans, electronics, etc.). Both configurations are discussed in the following sections. 5.2.1 Direct-Fired Desiccant Dehumidification4,5 A commercially available direct-fired desiccant dehumidification unit was used in this series of tests. Test condi tions for the process and regenera tive inlet dry bulb temperatures were maintained by 10- and 30-kW heaters, and the dew-point temperatures were maintained by injecting steam into the inlet sections of the process and regenerative air streams. Tests were performed for the baseline configuration, with regeneration air heated by direct burning of natural gas, and an IES configuration, where the exhaust gas from the microturbine was used as the regeneration energy source. In the IES configuration, the gas burner was deactivated. The exhaust gas was passed through the HRU to produce hot water prior to entering the desiccant unit regeneration inlet plenum. Fig. 13. IES system and microturbine: heat recovery efficiencies. (Source: “Integration of Distributed Energy Resources and Thermally-Activated Technologies,” DistribuTech Conference, Miami Beach, FL, February 2002.) 14 –– FEDERAL ENERGY MANAGEMENT PROGRAM .PDF Image | Summary of Results from Testing a 30-kW-Microturbine and Combined Heat and Power (CHP) System
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