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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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Due to the lack of performance data of the 250kW ORC system, the available performance information of ORC system is only for the 50kW system. It may not be appropriate to use this data to develop guidelines for large diesel gensets used in rural Alaska. Guidelines for ORC system selection will be provided after the performance data of the 250kW ORC system become available. Operations: Most of the operations procedures for GM are described in the manufacturer’s manual and the manual is up-to-date. No additional suggestions required for operation. Some of the most important one are given below a. During working on GM, if the hot water loop does not have a bypass, then do not start the hot water or cold water supply to GM (until ready to start the GM) as it may pressurize the working fluid and rotate the expander and generator. b. During regular check-list, check the expander high pressure value and hot water inlet temperature. The hot water inlet temperature greater than 245oF may result in over pressurizing the system which in-turn may lift the working fluid pressure relief valves causing lose in working fluid and may cause damage to components. c. In case if a need arrives for emergency shutdown of GM, adjacent to the HMI screen there is “Emergency Stop Button” on the front panel of GM. This will shutdown the GM immediately. Maintenance: Similar to operations most of the maintenance procedures for GM are described in the manufacturer’s manual and the manual is up-to-date. No additional suggestions required for maintenance. Some of the important ones are listed below. a. Check for non-condensable gases in the system (procedure given in manual). Purge the non-condensable gases from the system following the procedure given in GM manual. b. Visually inspect all the joints and connections for oil/water leak. c. Visually check the electrical wiring frequently for any damaged connections due to excess heat or loose connections (by tug test). Evaluation of Potential Impact on Rural Alaska Economy, Fuel Consumption, and Emissions and Greenhouse Gas Reductions: To evaluate all the effects listed above for rural Alaska, the number of villages, which have the best match to the GM, is needed. Due to the lack of performance data of the 250kW ORC system, it is difficult to make decision about how many villages have the better match with the 50kW ORC system or the 250kW system. This information will be provided after the performance data of the 250kW ORC system become available. 59

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