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Capstone Turbine Corporation • 21211 Nordhoff Street • Chatsworth • CA 91311 • USA Application Guide: Model C60 Integrated CHP The C60 ICHP system package has been designed for indoor or outdoor application. An outdoor exhaust flapper is included as standard, so for most outdoor applications no additional exhaust ducting will be required. For indoor application, or outdoor applications requiring duct extensions, suitable insulated exhaust ducting will be required. Several factors must be considered when designing suitable exhaust ducting: 1. Backpressure – Exhaust ducting must be pressure rated, and properly sealed to avoid buildup of toxic exhaust fumes. The C60 ICHP system’s MicroTurbine will provide positive exhaust flow under normal operation. However, the exhaust system must limit backpressure to no more than 5 inches of water column under all operating conditions. Nominal exhaust flow rate at full power is 425 l/s or 900 standard cubic feet per minute (scfm). This is roughly 1,700 cfm when adjusted for temperature. The exhaust outlet of the C60 ICHP system is 10-inch diameter. Guidance for backpressure calculations is available from ducting manufacturers. If the system design includes a backflow damper (ref item 5 below), use 0.7 inches of water column as the estimated forward pressure drop across the damper. 2. Temperature Rating – At full power and without heat recovery, the nominal exhaust temperature of the C60 ICHP is less than 600 °F. However, during transient conditions and/or high ambient temperature operation, the exhaust can reach 700 °F. Therefore, exhaust ducting must be rated for at least 700 °F. In addition, sufficient thermal insulation should be provided to avoid hazards to personnel or buildings due to contact with high temperature exhaust ducting. As a reference, double wall stainless steel ducting with 2 to 4 inch ceramic fiber insulation is a general-purpose solution. However, specifics of the application must be considered when designing a proper installation. 3. Condensation – While the exhaust system needs to be capable of the maximum temperature noted above, normal heat recovery operation reduces the exhaust temperature considerably. Therefore, the potential for condensation of moisture in the exhaust must be considered in any ducting system. For short runs to direct exhaust outside (for example through a single story roof or to elevate slightly the point of exhaust in an outdoor installation), and when the ICHP system is not switched on and off frequently, it may not necessary to make any accommodation for condensation. However for any other application, it is suggested that the exhaust ducting include means to capture any condensation and direct it away from the top of the ICHP system exhaust. Figure 7 shows a typical exhaust arrangement using an offset with drain. 4. Weight – The C60 Integrated CHP System can accept a maximum load on the 10-inch exhaust outlet of 25 lbs. When designing any exhaust ducting arrangement, suitable supporting means must be included to avoid damage to the heat exchanger structure of the C60 ICHP. Using an offset, as shown in Figure 7, is one way to avoid high loading. 480007-001 Rev D (June 2005) Page 16 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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