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Capstone Turbine Corporationn21211 Nordhoff StreetnChatsworthnCA 91311 Application Guide: Hot Water CHP Use with the Capstone MicroTurbine operating microturbine. This can result in excessive temperatures inside the non- operating microturbine that can cause physical damage to the engine and generator. This includes demagnetization of the generator permanent magnet, damage to the coatings on the air bearings, and/or stress failure of the compressor section. The problem can be corrected in one of several ways, for example: 1. Assurethatallmicroturbinesexhaustingintoacommonductarecontrolledsuch that they operate at the same power level settings when they are on, and cannot operate if one or more microturbines turn off. 2. Insertexhaustbackflowdampervalvesbetweeneachmicroturbineandthe common ducting or heat recovery device to prevent the hot exhaust gases of the operating microturbines from flowing back into the engines of non-operating microturbines. Backflow damper valves must be designed to work with the given application such that backpressure on any microturbine does not exceed 8 inches of water column, and exhaust backflow leakage does not exceed 1%. 3. Addanpurgingsystem,suchasanexhaustblower,tomaintainexhaust pressure less than the ambient microturbine inlet pressure. Plumbing – Water Piping & Pressure Drop It is essential to understand water flow restrictions to the extent that heat recovery is achieved. A lower than expected flow could mean that a system’s pump is working against substantial friction and will prevent full rated heat recovery. The pump must therefore be sized according to the calculated system pressure drop. Unifin inlet water piping is generally 1-1⁄2 inch FNPT if a pump is not supplied with the system. Outlet piping is 2 inch copper victaulic. Unifin inlet water piping is 2 inch copper victaulic fittings if a pump is supplied. Outlet piping is 2 inch copper victaulic. It is to user discretion whether to use 1-1⁄2 or 2 inch copper piping to the water source. Trying both diameters in the pressure drop equations below can help make the determination of diameter and length. The equation to calculate pressure drop is the Darcy equation – ∆p= fLρV2 D 2gc The friction factor, f, is read from a Moody chart in Figure 4, after calculating Reynolds number – Applications Guide - Hot Water.doc Page 10 of 16 April 19, 2002 where: Average flow velocity,V = QA Fluid flowrate, Q Flow cross-sectional area, APDF Image | Capstone App Guide CHP
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