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Federal Technology Alert unit LC at the maximum and minimum conditions with a microturbine power output of 25 kW is only 58 and 35% of the baseline direct-fired capacity. A microturbine with a minimum exhaust flow rate of at least 25.5 m3/min (900 scfm) would not require mixing of exhaust gas with outside air and should yield better results from the desiccant dehumidification unit. To show the improvement in IES efficiency with utilization of the waste heat, the efficiencies of the MTG only, the MTG and HRU, and the total IES (MTG, HRU, and DFDD) at various power levels are shown in Fig. 14. The efficiencies for each configuration were determined by the ratio of the total energy output to the total energy input. For the IES configuration, the total energy output consisted of the electric power output generated by the MTG, the heat recovered by the HRU, and the LC of the desiccant dehumidifica tion unit. The energy input included the gas input (based on the HHV of the gas) to the MTG and the electrical parasitics (all the power used by the fans, pumps, and electronics of the MTG, desiccant, and HRU units). Addition of the DFDD to the MTG and HRU configuration resulted in increased overall IES efficiency at all power levels with higher IES efficiencies and efficiency increments at higher kW output. Specifically, the IES efficiency increased by 7% from approximately 53% to 60% with addition of the DFDD (based on the HHV of the natural gas) at 25 kW (85,361 Btu/h) MTG power output.5 5.2.2 Indirect-Fired Desiccant Dehumidification System4 An IES configuration consisting of the MTG, HRU, and the IFDD was tested at the IES laboratory facility to deter mine the effects of power output of the MTG on the LC and latent LCOP of the IFDD, as well as on the overall IES efficiency. In this configuration, the regeneration heat source was a hot water loop interfacing with a heating coil in the IFDD. Heat is transferred to the water loop from the MTG exhaust through the HRU. The maximum water loop flow rate through the HRU was ~5.8 m3/h (~26 gpm) with a maximum hot water temperature of ~91oC (~196oF). The actual temperature depends on several parameters such as MTG output, Table 6. Latent capacity test results (IES-based operation) (Ref. 5) 16 –– 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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