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Capstone Turbine Corporation • 21211 Nordhoff Street • Chatsworth • CA 91311 • USA Technical Reference: Heat Recovery Module for Model C200 Microturbine temperature. Therefore, the following equation estimates the temperature rise for any water-based heat recovery system when the thermal output is known: Temperature Rise [°F] = 6.9 x Thermal Output [kW] Water Flow [gpm] Using the 90 °F (32 °C) ambient temperature example above for 1,500 foot (457 meter) elevation, 140 °F (60 °C) inlet water temperature, and 150 gpm (9.5 l/s) water flow, the thermal output of 248 kW provides a temperature rise of 9 °F (5 °C). For the 165 °F (74 °C) inlet water temperature and 200 gpm (12.6 l/s) water flow, the thermal output of 233 kW provides a temperature rise of 8 °F (4.4 °C), with an outlet temperature of 173 °F (78 °C). While the previous calculations are based on the full power output from Figure 2, the effect of partial load operation can also be estimated if necessary. The operating scheme for the microturbine is to try to maintain turbine exhaust outlet temperature by varying turbine speed (and therefore exhaust mass flow) as electrical power requirements change. If turbine efficiency remained constant as power output decreased, a linear relationship for thermal output would follow; that is, if the microturbine were operating at half power, the thermal output would likewise be half its full power output. This is almost the case down to about 50% power output. For less that 50% electric power output, the ratio of thermal output to electrical output will increase. However, a conservative thermal output can be estimated by using the same thermal to electric output ratio for all power levels. The above analysis is for water. The system can accept up to 50% water glycol mix, with slight change in the captured heat and water temperature rise. The exhaust diverter is not able to completely bypass exhaust energy due to both a small amount of exhaust leakage as well as conduction from the exhaust duct. Minimum heat recovery is 6 kW (20,000 BTU/hr). Table 1 provides a guide process and example for calculating maximum thermal and electric power output and associated water temperature rise for a given application. 410070 Rev. A (July 2008) Page 6 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.PDF Image | Technical Reference Model C200 Heat Recovery Module
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