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Capstone Turbine Corporation • 21211 Nordhoff Street • Chatsworth • CA 91311 • USA Application Guide: Model C60 Integrated CHP Thermal Performance Curves Thermal power output depends on several factors: Electric Power Output – The higher the electric output, the more thermal energy available in the exhaust gas, both in terms of temperature and mass flow rate, Ambient Temperature – For a given electric power output, higher ambient temperature also results in higher available exhaust energy, Water Inlet Temperature – As the water inlet temperature to the heat recovery system is lowered, more energy can be extracted from the MicroTurbine exhaust gas, Water Flow Rate – Within the allowable water flow rates, there is only a small variation in captured thermal energy due to changes in water flow rate. Slower flow rates mean higher water outlet temperatures, and thus slightly less captured thermal energy, Elevation –Thermal output de-rating is in proportion to the electric power de-rating at all ambient temperatures. Exhaust Backpressure – Increasing backpressure due to exhaust ducting results in minimal thermal output change. The information in this section provides a means to calculate the expected thermal output under various conditions. While the expected tolerance range for thermal output at any given point is rather large (at most ±10%), the total system efficiency will have less variation since lower electrical efficiency means higher available exhaust energy, and vice versa. There is also a strong variation in expected thermal output depending on ambient temperatures and electric power output. Therefore, it is suggested that the thermal output be calculated as simply as possible for estimating performance and making economic projections. A procedure for estimating the electric and thermal output is given below. Table 4 at the end of this section summarizes the steps described below, and can be referred to as needed. The starting point for estimating typical thermal output is to select the ambient temperature(s) at which the system is expected to operate. The Capstone product specifications are based on ISO conditions of 15 °C (59 °F) and sea level elevation, since this is the basis of electrical rating for the MicroTurbine. However, the system may be most needed at other temperatures. For example; for building heating an ambient of 35 to 40 °F may be most meaningful, while for application with an absorption chiller a 95 °F ambient may be a better basis for rating. Second, the typical inlet water temperature needs to be selected for the specific application. Figure 3 shows the electric output and thermal outputs for several inlet water temperatures for a single C60 Integrated CHP system operating at full power and sea level elevation. For example: using inlet water temperature of 140 °F at 60 °F ambient, the typical thermal output is 110kW. To convert to BTU/hr, multiplying by 3,413 BTU/kWh (i.e. 110kW ≅ 375,000 BTU/hr). At 40 °F ambient, the typical thermal output is 99kW (338,000 BTU/hr). At 90 °F, typical thermal output is 120kW (410,000 BTU/hr), and electric output is 56kW. 480007-001 Rev D (June 2005) Page 11 of 21 This information is proprietary to Capstone Turbine Corporation. Neither this document nor the information contained herein shall be copied, disclosed to others, or used for any purposes other than the specific purpose for which this document was delivered. Capstone reserves the right to change or modify without notice, the design, the equipment ratings, and/or the contents of this document without incurring any obligation either with respect to equipment previously sold or in the process of construction.PDF Image | Application Guide - Model C60 Integrated CHP (ICHP)
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