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Capstone Turbine Corporation • 21211 Nordhoff Street • Chatsworth • CA 91311 • USA Application Guide: C30 and C60 Hybrid Electric Vehicle (HEV) Application Information for Capstone Noise Attenuation Methods As pointed out earlier in this document, the Capstone noise attenuation goal (which has been continuously met) has been 65 dBA at 10 meters. Additional noise reduction opportunities exist for the OEM/Integrator, and may add value to a particular application. Noise attenuation efforts are close-coupled to pressure drop, maintenance, inlet heating, and environmental requirements. Efforts have been made to achieve lower overall noise, including the following methodologies: • Tuned Cavity • Extruded Metal • Bulk Attenuator Tuned Cavity The tuned cavity approach to noise reduction is relatively ineffective for the MicroTurbine. This is based upon the fact that a tuned cavity must be placed at different locations and must function at different frequencies and times during MicroTurbine operation. Extruded Metal Typical extruded metal and/or felt-type metal enclosure materials can be effective. However, they may not be very cost effective. Bulk Attenuator The bulk attenuator method of noise reduction is recommended by Capstone. This method may be employed for both the MicroTurbine inlet air stream and the exhaust pathway. Bulk attenuation materials consist of perforated metal sheeting with greater than 30% open area, screen-type materials, and/or fiberglass or foam sheeting items. These materials should be temperature appropriate and resistant to damage that may be caused by various weather conditions. WARNING It should be pointed out that fiberglass materials may pose a significant problem if the fibers were to be ingested by the MicroTurbine. Capstone currently uses a foam-type material for noise attenuation instead of fiberglass. If the foam-type material under consideration attenuates noise at 2 kHz, then it should also be adequate for the higher band of frequencies. Sources of composite foam currently in use at Capstone include the following: • The Soundcoat Company, Inc., 16901 Armstrong Avenue, Irvine, CA 92606. Phone: (949) 955-9202; Fax: (949 )222-0834; E-mail: http://www.soundcoat.com • E.A.R. Speciality Composites, 7911 Vionsville Road, Indianapolis, IN 46268. Phone: (877) 327-4332; Fax: (317) 692-3111; E-mail: http://www.soundcoat.com 480009-001 Rev B (October 2004) Page 37 of 54 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 respect to equipment previously sold or in the process of construction.PDF Image | Application Guide Model C30 and C60 HEV Application Information
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