PURECYCLE POWER SYSTEM MODEL 280 Application Guide

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PURECYCLE POWER SYSTEM MODEL 280 Application Guide ( purecycle-power-system-model-280-application-guide )

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SYSTEM OPERATION Hot Liquid Resource 195oF – 300oF (90oC – 149oC) Figure 1 – PureCycle Power System Schematic During system start up, the working fluid flows through the bypass valve around the turbine until sufficient heat is supplied to the system to enable proper operation. The bypass valve is open during start up while a valve upstream of the turbine, the turbine stop valve, is closed. Once sufficient vapor pressure is available upstream of the turbine, the controller opens the turbine stop valve and closes the bypass valve. The turbine/generator assembly has an integral oil cooling and lubrication system for the bearings and rotating equipment. The oil system and generator are cooled by the working fluid in a fully enclosed, hermetically sealed system, minimizing leaks and eliminating the need for an additional cooling system interface with the customer. Electrical System The turbine drives a two-pole induction generator that transmits three-phase AC power at 480V/60 Hz (or optionally at 380/400/415V/50 Hz) to the utility grid. The induction generator is started as a motor using a solid-state, phase-controlled starter and must always be synchronized to the grid. This reduces the amount of inrush current required by the motor during start up. Working Fluid The working fluid, R245fa, a hydrofluorocarbon with the chemical composition of pentafluoropropane, is commonly used as a foam-blowing agent for the insulation industry, and is a new refrigerant for centrifugal chillers. R245fa has zero ozone depletion potential because it contains no chlorine. With no flash point, the fluid is completely nonflammable. It is not federally regulated with respect to the Resource Conservation and Recovery Act (RCRA) or by the Department of Transportation for shipment. Codes and Safety The PureCycle power system is designed to minimize external leaks to the environment. The evaporator and condenser are stamped with the ASME Boiler and Pressure Vessel Code, and all piping complies with the standards of ASME B31.1, Power Piping, commonly used for steam systems. SYSTEM OPERATION Revision B – 09/23/2009 – Page 6 HTE66510

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