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Capstone Turbine Corporation • 21211 Nordhoff Street • Chatsworth • CA 91311 • USA Technical Reference: Capstone MicroTurbine Installation and Permitting Guidelines Exhaust System The exhaust from the MicroTurbine is hot, about 300 °C (500-600°F). As such, proper care should be taken in the rejection of this heat, whether that rejection is in the form of heat recovery in a heat exchanger or simple exhaust to the ambient air. In either case, the main objective is to transfer the hot exhaust to an acceptable area with minimal pressure drop or flow restriction. Items to Think About • Note that the exhaust flow is in "standard" cfm, so it must be corrected for temperature. The real flow is almost twice the value and must be used for duct sizing and backpressure calculations. Ducting multiple units’ exhaust requires backflow dampers. If one unit is down while others are operating, one must prevent hot gasses from being expelled through the non-operational unit. In some instances, MicroTurbines feeding a common exhaust manifold may require an interlock to prevent exhaust backflow into non-operating systems. Theexhaustductingmustberemovedforserviceandmaintenanceworksothe ducting must be installed in such a way that is supported and separable. The duct cannot be welded to the engine or upper stack. If interlocking ducting, such as Metalbestos, is used make sure to use a collar at the base that when removed can allow the upper stack coming out of the top of the MicroTurbine package to raise up 2 inches. Duct diameter and length must be designed such that backpressure at the MicroTurbine is less than 15 mm Hg, 0.289 psi (8 inches of water column). Ducting needs to be supported and designed to allow for removal and servicing of the MicroTurbine. The insulation may need to be removed near the coupling with the MicroTurbine exhaust pipe. As a “medium heat” device, be aware of requirements regarding penetration through roofs and walls of combustible and non-combustible material. Double walled chimneys may be required. If these penetrations are designed and stamped by an engineer, the building departments are usually satisfied, allowing wall penetrations in multistory buildings. Ensurethatchimneymaterialandthicknessmeetslocalcodes. Allow for condensation drainage if burning fuel or air containing H2S, per Fuel Gas codes. Ducting may need to be sloped, especially if burning fuel or air containing H2S. Silencers or baffles may be used, but consideration must be made for pressure drop and temperature rise. Pressure should be checked by placing a pressure sensor in a sampling port in the exhaust pipe above the MicroTurbine. Measure actual pressure to ensure that it is below the specified maximum. If the MicroTurbines are located in a closed room, several items must be considered. 410034 Rev E (December 2005) Page 10 of 16 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 product specifications, and/or the contents of this document without incurring any obligation either with respecttoequipmentpreviouslysoldorintheprocessofconstruction. PleasenotethatCapstoneisonlyresponsiblefortheMicroturbineandotherCapstoneproductsitsells,asprovidedforinCapstone’sProduct Specifications and warranties. Information provided in this document that relates to the system, as opposed to the Microturbine or other Capstone products, is not an indication that Capstone is taking responsibility for the systeminanywayandisprovidedonlyasgeneralguidance. CalculationsandtestingmustbeperformedtoverifythatdesignsolutionscomplywithalloftherequirementsofCapstone'sProductSpecification. All informationcontainedinthisdocumentisprovidedonan“asis”basis,anddoesnotaffectorchangeCapstone'sProductSpecificationsorwarranties. InnoeventwillCapstonebeliablefordamagesarisingdirectlyor indirectly from any use of the information contained in this document.PDF Image | Technical Reference Capstone MicroTurbine Installation and Permitting Guidelines
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