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Capstone Turbine Corporationn21211 Nordhoff StreetnChatsworthnCA 91311 Application Guide: Hot Water CHP Use with the Capstone MicroTurbine Electrical System Power Source Unifin needs power for its controller and internal water circulation pump. Unifin requires 110V power for almost every model except where an 80 gpm pump is installed. This pump requires 480V power. In either case, its onboard power transformer allows it to receive 480V power from the same circuit that the microturbine is connected to. Control Integration Table 3 below lists possible operating scenarios and the control interface needed to make the operation a reality. Table 3 – Control scenarios Operating scenario Customer requirement Integration Scheme Full exhaust recovery with maximum electrical output Total system efficiency is highest priority Pre-programmed time of use, interlock with process to shutdown if power or heat not needed Full exhaust recovery with thermal load following Thermal and total system efficiency needs outweigh electrical needs RS-232 or Modbus translator communication with process control system Divert exhaust with maximum electrical output Electrical needs outweigh thermal needs RS-232 or Modbus translator communication with process control system Typical Design Diagrams Mechanical The simplest implementation of hot water heat recovery is in a “boiler economizer” mode, where water is pre-heated to offset or supplant the use of a traditional water boiler. This is show in Figure 5 below. Other possible configurations might include installing the heat exchanger in parallel with the existing boiler. This will work when the heat exchanger water pump is relatively close in capacity with the boiler feedwater pump. Otherwise, the high pressure at the heat exchanger outlet will prevent recovered hot water from flowing as intended and dropping heat recovery in the process. Applications Guide - Hot Water.doc Page 13 of 16 April 19, 2002PDF Image | Capstone App Guide CHP
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