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Optimizing Heat Recovery Systems for Power Generation in Rural AK

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Optimizing Heat Recovery Systems for Power Generation in Rural AK ( optimizing-heat-recovery-systems-power-generation-rural-ak )

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2. Check the pump rotation direction by turning on the pump for very short period of time (2 seconds). 3. Check the flow meter; make sure the direction and orientation of flow meter and flow meter gets the flow reading. 4. Check the operation of bypass valves, bypass loop for the direction of cold water flow for cold water temperature control. OPERATION PROCEDURE: Operation procedure explains the sequential steps in starting the GM, the main steps involved in this process are explained below. 1. Check the cold water is flowing through the GM condenser. This can be checked by looking at the GM HMI screen, which shows the “CW FL SW” (cold water flow switch) is “ON” with green tab color indicating the cold water flow. 2. On the GM HMI screen, if “MCR” is shown “OFF” with gray tab color, then press the “ENABLE” button on the GM front panel (not on HMI screen) to bring master control relay (MCR) into “ON” position with green tab color. 3. With the cold water flow switch and MCR in “ON” position the GM HMI screen should show “START” button. 4. GM cannot be started directly at hot water temperature of 225oF as it will stop abruptly due to over speed. For reliability test first set the hot water flow rate at 160gpm (by adjusting the VFD frequency) and 200oF (by operating steam valve using the LABVIEW). 5. For reliability test set the cold water flow rate at 160gpm. 6. Now the GM should be ready for start and hit the “START” button on the GM HMI screen. 7. After running the GM for 15minutes at 200oF of hot water supply temperature, increase the hot water temperature to 225oF for continuing with the reliability test. CHECK LIST: Check list is the sensors, gauges, joints etc., located on the Green machine itself, hot water loop piping and cold water loop piping, which needs monitoring from time to time while the GM is in operation. GM itself does not require any special inspection every day, as observed from reliability test. Following table (Table 7) gives the list of sensors and there location which could be monitored from time-to-time (weekly basis). Table 7: Check list green machine, hot water and cold water loop Sensor or Gauge Hot water and cold water flow rates GM evaporator and condenser pressure drop on hot water and Location Respective flow meters Across GM Evaporator and Condenser Hot water supply temperature Data acquisition system (if manualthermometer is installed, than at hot water inlet to GM) 39

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