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Capstone Turbine Corporation • 21211 Nordhoff Street • Chatsworth • CA 91311 • USA Technical Reference: Heat Recovery Module for Model C200 Microturbine significantly. Since maximum allowable backpressure is only 6 inches water column at the outlet of the heat recovery module, the maximum change in electric power output is only 1.5%, with no change in thermal output. Therefore, correcting output values due to system backpressure may not provide significant improvement in accuracy of the calculated outputs. If a correction for backpressure is desired, the method described here can be used. For the 90 °F (32 °C) and 1,500 feet (457 meters) elevation example above with 4 inches of water column backpressure, the 172 kW electric output is reduced by 4 times 0.25% (or 1 percent) to become about 170 kW. The 248 kW (846,000 Btu/hr) thermal output remains the same. The thermal output at different inlet water temperatures is essentially a linear relationship, and can be approximated using the following correction factor: Inlet Water Temp Correction Factor = 1 – (Temp [°F] – 140) x 0.00295 where “Temp” is the inlet water temperature in degrees Fahrenheit. Using the 90 °F (32 °C) ambient example above at 1,500 ft (457 meter) elevation, if the inlet water temperature is 165 °F (74 °C), the correction factor is 0.926, and thermal output would be 230 kW (785,000 BTU/hr). There is a small variation in the predicted thermal output depending on water flow rate. Figure 3 shows this correction factor graphically, and provides a curve fit equation as well. For example, to convert the 150 gpm thermal output numbers above to thermal output at 200 gpm (12.6 l/s), the correction factor is about 1.013 (or 1.3% higher than predicted for 150 gpm). Therefore, the predicted thermal output at 90 °F (32 °C) ambient with 165 °F (74 °C) inlet water temperature and 200 gpm (12.6 l/s) water flow becomes 233 kW (or 795,000 BTU/hr). 1.03 1.02 1.01 1.00 0.99 0.98 0.97 0.96 kWt Correction Factor vs Water Flow Rate = .923+.00069*(Flow)-1.2E-6*(Flow)2 50 100 150 200 250 300 Water Flow Rate [gpm] Figure 3 – Correction Factor for Thermal Output vs Water Flow Once the net thermal output has been calculated for the selected ambient temperature, elevation, inlet water temperatures, and water flow rate, the water outlet temperature can be easily calculated using the equation below. The specific heat capacity and density of water are both relatively constant over the allowable temperature range, and their product is within ±0.7% using a 160 °F (71 °C) nominal inlet water reference 410070 Rev. A (July 2008) Page 5 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. Correction FactorPDF Image | Technical Reference Model C200 Heat Recovery Module
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