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CPUC Self-Generation Incentives Program – Thermal Analysis Report Table ES-1: CPUC Program Goals versus Actual Performance Measure of Performance 218.5(a) % Useful Thermal 218.5(b) Plant Efficiency CPUC Goals Actual Program Overall Performance ICEs Microturbines 5.0% 42.5% 43.4% 36.8% 40.2% 37.9% 48.9% 34.2% Itron identified several contributing factors to poor performance. In general, these factors can be placed in two distinct groups: system/component design problems and equipment problems. Design problems involve all decisions and analyses through system startup. Equipment problems include equipment failures occurring after system startup. Design Approach Issues Hoursofoperationareroutinelyoverstated(i.e.,plannedversusactualannual hours). TheWasteHeatUtilizationWorksheet(WHUW)doesnotquantifythecoincidence of electrical demand with thermal demand. As a result, some applications assumed coincident power generation and thermal energy recovery and use. This results in a mismatch and possibly over-sizing of equipment, ThegeneratorratingusedintheWHUWoftendoesnotaccountforparasiticloads, thereby overstating electrical output. Electricalconversionefficienciesareroutinelyoverstated. FuelmaybereportedinHigherHeatingValue(HHV)ratherthanLowerHeating Value (LHV) Technical Operating Issues Heatexchangerfailuresoccurduetounexpectedreactionswithworkingfluids. EnginecylinderheadfailureishigherthanexpectedforICEs. Absorption chiller failures cause reduced useful waste heat recovery. Recuperatorfailurescausepoorelectricalpoweroutputformicroturbines,thereby reducing overall system efficiencies. Gascompressorfailureformicroturbinescauseslossofpowerandreduced electrical and system efficiencies. Operatingtemperaturefluctuationshaveaneffectonsystemelectricalefficiency (this can be both a design and operating issue). Irregularmaintenanceleadstoreducedoperationandlowerwasteheatrecovery and system efficiency. Executive Summary ES-3PDF Image | In-Depth Analysis of Useful Waste Heat Recovery and Performance of Level 3/3N Systems
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