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Capstone Turbine Corporation • 21211 Nordhoff Street • Chatsworth • CA 91311 • USA Technical Reference: Capstone MicroTurbine Installation and Permitting Guidelines Inlet Air In the process of producing power, the MicroTurbine produces heat, both in the engine and the electronics. In general, the electronics produce more heat as the generator produces more power. The generator produces more power, as the compressor inlet air gets cooler. Even though the increased power creates more heat in the electronics, this is balanced by the fact that the cooler air will keep the electronics from overheating. The key factors are to provide air that is the same temperature to the engine and electronics and to not restrict that air flow. Items to Think About Engineaircannotbemorethan2°Ccoolerthantheelectronicscoolingairtoprevent the electronics from overheating. For example, do not air condition the engine inlet and have the electronics draw on ambient air. It is not recommended to supply electronics and engine air via the same duct. If air is coming from a common area, divide the electronics and engine air all the way to the ambient free air. There are ways of common ducting but they require forced air systems and properly sized and located ducting to prevent the engine from pulling air away from the electronics causing overheating. Note the max pressure drop requirements in the table above. Silencingofinletaircanbedonebutpressuredroptoelectronicsmustbeminimal, less than 0.1 inch of water. Using ducts that are lined with foam and a length over diameter (L/d) ratio over 8 can provide good silencing with lower pressure drop. Make sure to follow above guidelines regarding no common ducting. Air can come from either inside a building or from outside as long as temperature and pressure drop requirements are met. InletairductmayneedtobeslopedperMechanicalCodes. If the MicroTurbines are located in a closed room, several items must be considered. o Thebestlocationtoprovidethecoolingairislowintheenclosureinfrontof the MicroTurbine. This helps push the hot air up and out of the enclosure, eliminating areas of stagnant, hot air and keeps the units from ingesting hot air. o Itisusuallybettertocoolaroombypullingtheairoutoftheroomand discharging it to the outside. Fresh air is drawn in via vents. The fresh air can come from either the outside or interior air. Keep in mind that the MicroTurbines have an upper temperature limit. If the outside air can reach 100° F on a hot day, it leaves very little margin to the upper limit. Therefore it may be advantageous to use cooler interior air as long as it is provided to both the engine and electronics. o Air feeding the room may need to be provided using a fan. By using a thermostatically controlled fan for the room, one may be able to reduce the room temperature and hence the engine inlet temperature thus increasing engine power output. 410034 Rev E (December 2005) Page 6 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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