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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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GM Hot Water Inlet Temp Steam Inlet Pressure Steam Condensate Pressure Steam Valve Position Hot water flow rate Hot water heat supply to GM in MWH Cold water flow rate GM Evaporator Outlet or Expander inlet Temp (sensor on pipe surface) GM Pump Inlet Temp (sensor on pipe surface) GM Pump Outlet Temp (sensor on pipe surface) GM Refrigerant Tank Temp (sensor on tank surface) GM Condenser Inlet Pressure GM Evaporator Inlet Pressure GM Pump Inlet Pressure GM Pump Outlet Pressure Refrigerant Tank Pressure GM Hot Water Bypass Temp (sensor on pipe surface) GM Hot Water out of PH before bypass (sensor on pipe surface) Expander Low Pressure (PSIG) Bearing Temp (F) CW Supply Temp (F) (sensor on pipe surface) CW outlet Temp (F) (sensor on pipe surface) HW Supply Temp (F) (sensor on pipe surface) HW outlet Temp (F) (sensor on pipe surface) Generator runtime hours Lube oil pressure (PSIG) Generator RPM GM pump Power (kW) Total GM kWH from starting GM Hot water outlet Temp Heat rejected to cold water in GM condenser in MWH GM Expander Outlet Temp (sensor on pipe surface) Expander Rear Temp (F) (sensor on pipe surface) GM Net Power (kW) Table 3 Selected Components for Heating and Cooling Loops Component Size Reason for selection Green machine (GM) Power output: Max 50kW, Min 5kW Hot water supply: 180oF to 250oF. Cold water supply: 40oF to 110oF The only commercial unit available in market at that time which can recover heat to power from diesel engine jacket water temperatures (200oF) Steam to Hot water heat exchanger i. Heat exchange rate: 4000MBTU/hr ii. Area = 111.00ft2 i. Based on heat source requirement for GM. At 5.5% efficiency (worst case scenario), the GM would need 4000MBTU/hr for upgraded GM of 65kW. ii. Area of HX was selected with communication with heat exchanger manufacturer Steam flow rate control valve with actuator i. Valve Spec.: Valve flow coefficient (Cv): 160; ii. 4” Normally closed Siemens valve iii. Actuator: SKC62U i. The reason for using steam flow control valve with actuator is to manipulate hot water supply temperature to GM from 155oF to 250oF. ii. The valve flow coefficient (Cv) was calculated from standard manufacturer’s handbooks. The calculated Cv obtained was about 135. 24

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