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Capstone Turbine Corporation • 21211 Nordhoff Street • Chatsworth • CA 91311 • USA Application Guide: Model C60 Integrated CHP 5. Common Exhaust Ducting – Exhaust from several MicroTurbines cannot be brought to a common duct system without considering the impact of reverse exhaust flow. If one MicroTurbine is not operating, exhaust from the common duct will flow back into the non- operating unit. This condition will elevate temperatures in the non-operating unit, causing potentially expensive equipment damage. If the non-operating unit is located indoors (or other area with restricted ventilation), toxic exhaust fumes can build up, causing a safety hazard for anyone in the area. Therefore, means to prevent backflow must be provided for in the exhaust ducting system design. One method to avoid reverse flow is to add an exhaust fan so that the common exhaust duct is always at negative gauge pressure. High temperature induction type exhaust fans are suitable for the potentially high exhaust temperatures, and must be interlocked with the MicroTurbines to assure that no MicroTurbine is operating if the fan is not. An alternative is to use a suitable exhaust backflow damper. Capstone offers backflow dampers with a maximum reverse flow of 0.1%, which are designed to prevent over-temperature damage to a non-operating MicroTurbine. The total system design must still consider the impact that even this small amount of reverse flow exhaust may have on any enclosed location. Currently, the largest backflow damper offered by Capstone has an 8 inch diameter. The exhaust duct can be reduced to 8 inches for the damper as well as downstream ducting, provided exhaust pressure calculations are performed to ensure compliance with the maximum allowable 5 inches water column backpressure at the C60 ICHP exhaust. (Complete Ducting and Support Structure not shown) Exhaust Ducting ICHP Figure 7 – Exhaust Ducting with Offset for Condensation 480007-001 Rev D (June 2005) Page 17 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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