Cost-Effectiveness of Distributed Generation Technologies

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Cost-Effectiveness of Distributed Generation Technologies ( cost-effectiveness-distributed-generation-technologies )

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Cost-Effectiveness of Distributed Generation Technologies 11,500 Btu/kWh (LHV). As such, electrical efficiencies for the Capstone C65 and Ingersoll- Rand IR75 are rated at 29% and 30% (LHV), respectively. In contrast, measured data for microturbines installed under the SGIP showed electrical efficiencies of approximately 22%.34 Many factors can affect the efficiencies of microturbine systems. Ambient temperatures have a noticeable effect on both the power output and efficiency of these units. Decreased air mass flow rates will result in a power decrease, while efficiency decreases because the compressor requires more power to compress air of higher temperature. The same effect goes for altitude changes. It takes more work for the microturbine to compress the higher-altitude, less dense air, reducing the efficiency of the units. Figure A-31 from Capstone shows how its C65 model performs with changes in ambient air temperature. For the purposes of this study, microturbines were assumed to have an electrical efficiency of approximately 22-24% (LHV). Figure A-31: C65 Net Power & Efficiency vs. Ambient Temperature at Sea Level Source: Capstone Turbines, Specification Sheet for C65 System. 34 Itron, CPUC Self-Generation Incentive Program: Eighth-Year Impact Evaluation Report, June 2009, pg.5-39. Itron, Inc. Appendix A-57 DG Technologies

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