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Capstone Turbine Corporation • 21211 Nordhoff Street • Chatsworth • CA 91311 • USA Technical Reference: Heat Recovery Module for Model C200 Microturbine 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 microturbine and HRM 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 HRM system exhaust. 4. 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), exhaust fumes can build up, causing a safety hazard for anyone in the area. Therefore, a 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 prevention scheme. 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, or on a non-operating microturbine, including long-term damage from condensation. Currently, the largest backflow damper offered by Capstone has a 12 inch diameter, with a forward flow drop of 0.6 inches water column at full power operation. Liquid Connections Liquid connections are done using the 4 inch 150 lb flanges on the HRM, as shown in O&I drawing 523646. Liquid connections should include shutoff and bypass valve piping in the event that the HRM has to be isolated. Liquid piping to and from the HRM should allow the HRM to be filled at all times, especially when the flow could stop. Make sure that liquid connections do not restrict access doors or panels from being opened. Pay particular attention to thermal expansion from liquid piping. Apply expansion joints as required to ensure that there is no unnecessary pressure from thermal expansion on the liquid piping. Drain and vent connections must also be considered in the installation design, using appropriate connections on the HRM as shown in the O&I drawing 523646. The customer should make provision to connect and regulate flow from the condensate drain at the bottom of the HRM. 410070 Rev. A (July 2008) Page 12 of 15 Capstone reserves the right to change or modify, without notice, the design, specifications, and/or contents of this document without incurring any obligation either with respect to equipment previously sold or in the process of construction.PDF Image | Technical Reference Model C200 Heat Recovery Module
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