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SRI/USEPA-GHG-VR-27 September 2003 piping from the Unifin is directly connected to hot PG fluid coils in the Munters unit. The microturbine skid, which includes the Capstone turbine, Unifin heat exchanger, and natural gas compressor module, is installed on the roof adjacent to the Munters air-handling unit (approximately 35 feet apart). 1.4. PERFORMANCE VERIFICATION OVERVIEW This verification test design was developed to evaluate only the performance of the CHP system—not the overall building integration or specific management strategy. The Test Plan specified a series of controlled test periods in which the GHG Center intentionally modulated the unit to produce electricity at nominal power output commands of 15, 30, 45, and 60 kW. Demand for space heating and desiccant regeneration was low during the testing period due to the mild weather. The PG was, therefore, manually directed to the Munter's space-heating coil during each of the controlled test periods (the store was heated for short periods of time). This was done in an attempt to maximize the heat demand on the CHP system and demonstrate CHP performance under periods of high heat demand. These tests are identified herein as controlled test periods with heat recovery maximized. The Test Plan also specified that controlled tests at the 30 and 60 kW power command points be repeated with the Unifin heat exchanger damper open (heat recovery bypass mode) to evaluate the impact of heat exchanger back-pressure on microturbine performance. However, problems with the Unifin control panel precluded the GHG Center from manually locking open the damper. Instead, these tests were conducted under normal CHP and Munters system operations such that the Unifin damper was automatically opened in response to the low heat demand of the store during the test periods. This allowed these tests to be conducted with operations similar to those planned because the Unifin would go into heat-recovery mode (that is, with the damper closed) only long enough to maintain PG temperatures above 170 oF under these conditions. The heat exchanger damper was open for approximately 25 minutes and then closed to heat recovery mode for the remainder of time during each of the 30-minute test replicates conducted under these conditions. These tests are identified herein as controlled test periods under normal conditions. The controlled test periods were followed by a period of extended monitoring to evaluate power and heat production and power quality over a range of ambient conditions and store operations. The microturbine was allowed to operate continuously at full load during the extended monitoring period. The specific verification factors associated with the test are listed below. Brief discussions of each verification factor and its method of determination are presented in Sections 1.4.1 through 1.4.5. Detailed descriptions of testing and analysis methods are not provided here but can be found in the Test Plan. Heat and Power Production Performance • Electrical power output and heat recovery rate at full load • Electrical, thermal, and total system efficiency at full load • Combined heat and power efficiency (total efficiency) Power Quality Performance • Electrical frequency • Voltage output • Power factor • Voltage and current total harmonic distortion Emissions Performance • Nitrogen oxides (NOX) concentrations and emission rates 1-7PDF Image | Environmental Technology Verification Report
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