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Federal Technology Alert Table 3. Capstone 30-kW microturbine with damper 3/8 open (Ref. 3) Table 4. Microturbine performance at constant speed and varying back-pressure (Ref. 3) component and overall IES performance. The following sections discuss results of tests performed at the ORNL IES Laboratory for configurations of a 30-kW microturbine DG source, an HRU, and various thermally activated technologies. 5.1 AIR-TO-WATER HEAT EXCHANGER (e.g., HRU)1,2 Since all of the thermally activated technologies were tested with the HRU as a part of the IES, the first tests to be discussed are for the MTG and exhaust- gas-driven, air-to-water heat exchanger HRU. These tests were performed to determine the quantity of MTG waste heat that could be recovered to gener ate hot water for space heating or use with other thermally activated technolo gies and to determine the IES (MTG + HRU) efficiency, both as a function of microturbine output power. The HRU water flow rate for this series of tests was 4.3 m3/h (19 gpm), and the power output of the turbine was varied from 10 to 30 kW in increments of 5 kW. The resulting recoverable waste heat was found to be ~23 kW (~75,000 Btu/h) with the microturbine at one-third power up to ~ 44 kW (or~150,000 Btu/h) with the unit at full power as shown in Fig. 12. The measured exhaust flue gas temperature rejected to the atmosphere (leaving the heat exchanger) was ~127oC (260oF) at full power; however, at one-third power the exhaust temperature was ~93oC (200oF). Figure 13 shows a relatively constant measured IES system (measured CHP) efficiency of ~55% based on a higher heating value (HHV) for the natural gas over the microturbine’s power output range. For comparison purposes, the microturbine efficiency without heat recovery (microturbine), which ranges from approximately 18 to 24%, and the manufacturer’s data are also shown in Fig. 13. The test efficiency agreed well with the published performance data. 5.2 DESICCANT DEHUMIDIFICATION4,5 Tests were conducted at the ORNL IES Laboratory Facility for IES configura tions employing a commercially available direct-fired desiccant dehumidification FEDERAL ENERGY MANAGEMENT PROGRAM ––13PDF Image | Summary of Results from Testing a 30-kW-Microturbine and Combined Heat and Power (CHP) System
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