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Capstone Turbine Corporation • 21211 Nordhoff Street • Chatsworth • CA 91311 • USA Technical Reference: Heat Recovery Module for Model C200 Microturbine 300 280 260 240 220 200 180 160 140 120 100 Hot Water and Electric Output full electric power with 60C (140F) inlet and 9.5 l/s (150 gpm) water flow Net Electric Pow er Hot Water Output -10 0 10 20 30 40 50 60 70 80 90 100 110 120 130 Ambient [F] Figure 2. Electric and Thermal Output Vs Ambient Temperature at Full Electric Power and Sea Level Elevation For example, at 60 °F (16 °C) ambient, the predicted thermal output is 246 kW. To convert the output to BTU/hr, multiply the value in kilowatts by 3,413 BTU/kWh: BTU/hr = kW x 3413 BTU/kWh For the 60 °F (16 °C) example, 246 kW ≅ 840,000 BTU/hr. At 40 °F (4 °C) ambient, the predicted thermal output is 218 kW (744,000 BTU/hr). At 90 °F (32 °C), predicted thermal output is 266 kW (908,000 BTU/hr), and electric output is 183 kW. Elevation above sea level has the effect of de-rating the maximum power output, both electric and thermal. Elevation de-rating curves for electric power output are provided in the C200 Technical Reference 410066. For example, using the 90 °F (32 °C) ambient example above and elevation of 1,500 feet (457 meters), the electrical output of a C200 becomes 172 kW. The thermal output stays in proportion to the electric output, with a slight additional reduction for elevation of 0.5% per 1,000 ft. Use the following equation to convert the thermal kW output (termed “kWt”, versus the electrical output “kWe”): kWt (elevation) = kWt (sea level) x kWe (elevation) x 1 - 0.005 x Elevation [ft] kWe (sea level) 1000 For this example, the thermal output is calculated to be 248 kW (846,000 Btu/hr). For ambient temperatures where power output is limited by the ambient temperature (above about 70 °F, or 21 °C, at sea level), the electric power output will be reduced about 0.25% for each inch water column backpressure. Thermal output will not change 410070 Rev. A (July 2008) Page 4 of 15 Capstone reserves the right to change or modify, without notice, the design, specifications, and/or contents of this document without incurring any obligation either with respect to equipment previously sold or in the process of construction. kW OutputPDF Image | Technical Reference Model C200 Heat Recovery Module
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