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 Table A-7 is a summary of the 2008 and 2009 electric conversion efficiencies for fuel cell systems installed under the SGIP. The average electrical efficiencies of 39.3% and 40.6% compare well to the UTC specification sheet numbers but are significantly lower than the electrical efficiencies shown for Bloom or FCE. Several points need to be remembered when comparing the SGIP measured efficiencies against values taken from specification sheets: 1) the SGIP values represent averages of fuel cell technologies from several generations while the specifications represent a single generation of technology; 2) the SGIP values represent annual averages while the vendor specification sheets may represent a single, maximum efficiency level; and 3) the measured SGIP electrical conversion efficiency values are limited in their sample size (i.e., five data points). Table A-7: Measured Fuel Cell Electric Conversion Efficiencies (SGIP: 2008-09) 2008 8 40.6 ± 4.1 2009 5 39.3 ± 2.0 Source: Itron, 2008 and 2009 SGIP Impact Evaluation Reports. Waste Heat Recovery Due to their relatively high operating temperatures, fuel cells are good candidates for waste heat recovery. Few fuel cells were installed in the early program years of the SGIP and there is limited waste heat recovery information. However, Table A-8 provides a summary of the measured waste heat recovery from fuel cells operating in the SGIP during calendar year 2009. The values represent the observed useful waste heat recovery in units of thousands of Btu per kilowatt-hour of generated electricity (kBtu/kWh). The CPUC has indicated that in a reconfigured SGIP, CHP systems must achieve at least 60% system efficiency. Assuming that fuel cells will operate at 46% electrical efficiency, this will require them to have a least a 14% thermal efficiency. Consequently, for the purposes of this study, fuel cells were assumed to have the ability to recover 1.84 kBtu of useful waste heat per kW of generated electricity. Table A-8: Waste Heat Recovery from SGIP Fuel Cells (2009) 2009 7 0.01 1.98 0.81 0.78 Metered Systems Electric Efficiency Program Year n (%, LHV) Metered Sites Waste Heat Recovery (kBtu/kWh) Year n min max mean Capacity Weighted Average Itron, Inc. Appendix A-17 DG Technologies

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