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Heat Source Loop: Again the heat source loop can be sub divided into two loops; they are steam loop and hot water loop. Steam to hot water heat exchanger is the component which connects both of the loops. This heat exchanger is used to transfer heat from steam to hot water. 1. The main installed components of the steam loop are steam/water heat exchanger, steam flow control valve, steam trap, condensate piping. 2. The main installed components in the hot water loop are hot water VFD pump, air separator, pressure relief valve, expansion tanks, BTU meter, temperature mixer, ON/OFF solenoid valves 3. The steam/water heat exchanger, VFD pump, and temperature control valves are used to control hot water temperature and flow rate flowing into the ORC system to simulate heat source conditions obtained from different diesel engine loads. Temperature mixers are used for maintaining uniform temperature throughout the cross-section of the pipe for more accurate heat input measurements. The ON/OFF solenoid valves are used when there is emergency shutdown of the power unit so that the hot water by-passes and flows back to the heat source instead of power unit. The BTU meter is used for measuring the flow rate and amount of heat released by the hot water to the evaporator and pre-heater of the power unit. Heat Sink Loop: 1. The main installed components of the heat sink loop include the hose from fire hydrant to power unit, pump (not VFD), BTU meters, check valve, two 3-way flow and temperature control butterfly valves, bypass loop, temperature mixer, hose from power unit to a ditch. 2. The fire hydrant valve, 3-way butterfly valves, pump, and bypass loop are used for flow rate control and the water inlet temperature of the GM cooling side. 3. The BTU meter is used for measuring the flow rate and amount of heat released by the working fluid to the cooling water in the condenser of the power unit. The check valve is to prevent the water flow back into the fire hydrant. Electrical system: 1. The electrical system installation is basically the electrical wiring required for various components (ORC power unit, VFD pump, cold water pump etc.) in the whole test system and for safety concerns. The wiring diagram is given in Appendix IVB. 2. Electrical wiring has been successfully completed for uploading the power generated by the GM to UAF grid. Electrical wiring has also been completed for powering the VFD pump on hot water loop, pump on cold water loop, steam control valve, two 3-way bypass valves in cold water loop. 3. A Grid protection relay is used to protect the grid and the ORC system. Instrumentation: Performance characteristics of the ORC system and its components are obtained from measured data through data analysis. Performance characteristics are defined in terms of various input conditions of the heat source and heat sink. The performance characteristics can then be used for selecting appropriate rural Alaska diesel gen sets for this ORC system and planning waste heat distributions for optimal returns from waste heat applications. Operation and performance parameters to be detected and collected for this test are summarized into five groups and listed in Table 2. Besides the measurement devices originally equipped with 22PDF Image | Optimizing Heat Recovery Systems for Power Generation in Rural AK
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