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Federal Technology Alert Based on the increased heat available for input to the ABSC unit with increased ambient temperature, the ABSC unit cooling capacity (Qchw) increase was observed to be nearly linear with ambient temperature from ~19 kW (65,000 Btu/h) at 17.2oC (63oF) to over 26 kW (90,000 Btu/h) at 30oC (86oF) for a Gchw of 19 gpm. At a Gchw of 34 gpm the cooling capac ity (Qchw) increase was from ~21 kW (71,000 Btu/h) at 17.2oC (63oF) to ~27 kW (92,000 Btu/h) at 30oC (86oF). General observations that can be drawn from the test results are that cooling capacity increases with ambient temper ature at rates of 1.24% per degree F at a chilled water flow rate of 0.07 m3/min (19 gpm) and 1.6% per degree F at a chilled water flow rate of 0.13 m3/min (34 gpm), and cooling capacity increase ranges from 0.77 %/gpm to 2.11%/ gpm when the Gchw increases from 19 gpm to 34 gpm. The COP of the ABSC was defined as the ratio of ABSC cooling capacity, Qchw, to QHRU (AC), the heat supplied by the HRU at the ABSC inlet. Use of the heat supplied at the ABSC inlet takes into account the losses in the hot water loop from the HRU to the AC. The effect of ambient temperature on the coefficient of performance (COP) of the ABSC is shown in Fig. 18. The COP increased with ambient tem perature from ~57 to ~72% (~0.65% per degree F) at the chilled water flow rate of 0.07 m3/min (19 gpm) and from ~62 to ~75% (~0.57% per degree F) at the chilled water flow rate of 0.13 m3/min (34 gpm). Increasing the chilled Fig. 17. Effect of ambient temperature on cooling capacity. (Source: “Labo ratory R&D on Integrated Energy Systems (IES),” Proceedings of the 2003 International Congress of Refrigeration, ICR2003,Washington, DC, August 2003.) water flow rate from 0.07 to 0.13 m3/ min (19 to 34 gpm) resulted in COP increases ranging from 2 to 5% (0.133 to 0.33% per gpm). The increased COP with increased chilled water flow rate was calculated without consideration of the increased parasitics required to achieve the higher water flow rate. 5.3.2 Effect of Ambient Temperature on IES Configuration Efficiency6 The effect of ambient temperature on the efficiency of IES MTG + HRU + ABSC configuration is shown in Fig. 19. Also shown in Fig. 19, for comparison, are the efficiencies of various combinations of the MTG, HRU, and ABSC components. The combinations include MTG (producing electric power only), MTG + HRU Fig. 18. Effect of ambient temperature on the COP of the absorption chiller. (Source: “Laboratory R&D on Integrated Energy Systems (IES),” Proceedings of the 2003 Inter national Congress of Refrigeration, ICR2003,Washington, DC, August 2003.) (producing electric power and heating), and MTG + HRU + ABSC (producing electric power and cooling). All of the efficiencies, defined as the ratio of the energy output to the energy input, presented in Fig. 19 are based on the HHV of natural gas. When calculating the MTG efficiency, the energy output consisted of the net electric power generated by the MTG, and the energy input was the natural gas input. The energy input and output for the IES configuration of the MTG and HRU were the net electric power generated by the MTG plus the heat recovered by the HRU and natural gas input plus the electric power consumed by the HRU including the booster pump. For the overall IES configuration of the MTG, HRU, and AC, the energy output consisted of the net electric FEDERAL ENERGY MANAGEMENT PROGRAM ––19PDF Image | Summary of Results from Testing a 30-kW-Microturbine and Combined Heat and Power (CHP) System
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