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Home My WebLink AboutCity of Unalaska Waste Heat to Energy Part 2 - 2012 REF Grant 2195449The project assessment program contains default input values intended for internal system use. Input values will vary depending on technology, geographic location, and site dependent variables e.g.: water temperature and flow. The following reports serve as a guide only. Due to volatility of incentive policies/availability, electric prices and technology some of projected values may be out of date or inaccurate. Before submitting for a report, review data and verify that they are correct for your analysis. Dutch Harbor Power Plant Waste Heat to Energy Electric Power Systems, Inc Groundwater Project Evaluation 8/20/2012 Engine Jacket Water (JW) Project Name: Dutch Harbor Power Plant Waste Heat to Energy Project Company: Electric Power Systems, Inc Heating Source: Engine Jacket Water (JW) Cooling Source: Groundwater Annual Runtime: 8000 Hours Project Service Lifetime: 20 Years Pump Parasitic Load: 0 kW Price per kWh: 0.42 U.S.D. Hot Water Temperature: 200°F Hot Water Flow: 217 GPM Avg. Ambient Temperature: 45°F Approach Temperature: 0°F Available Thermal Power: 3.08 MMBTU/hr Green Machine Size: 30-50 kWe Green Machine Generator Frequency: 60 Hz Average GM Gross Power Output: 45.3 kWe Average Total Net Power Output: 42.3 kWe Avg. Total Internal & External Parasitic Load: 3 kWe Average GM Internal Parasitic Load: 3 kWe Average External to GM Fan Parasitic Load: 0 kWe Average External to GM Pump Parasitic Load: 0 kWe Annual Gross Energy Output: 362 MWh Annual Net Energy Output: 338 MWh Average Heat Consumed: 2.08 MMBTU/hr Maximum Heat Consumed: 2.08 MMBTU/hr Average Heat Rejected: 1.78 MMBTU/hr Maximum Heat Rejected: 1.78 MMBTU/hr Hot Water Inlet Temperature: 200°F Hot Water Outlet Temperature: 179°F 45.3 kWe 47.1 kWe Project Input Electrical Output* Thermal Balance* Hot Water Temperature Comparison 42.3 kWe 45.3 kWe Net Power 200°F 42.3 kWe Temperature Gross Power *consumed heat, rejected heat, and electrical output values are based on measured ElectraTherm test data. Small errors in measuring temperature and flow due to instrumentation tolerances can induce a noticeable error in thermal measurement. This document is a guideline only, and the thermal error on heat rejected and heat consumed can be up to +/- 80kW 43.3 kWe 240°F 47 kWe 42.4 kWe 200°F 220°F 1. 2. 3. 4. 5. 6. 7. 30% water/glycol mix assumed in this evaluation. Green Machine electrical output limted by hot water inlet temperature. It should be noted that there is additional kW of heat available in the exhaust gas flow. There is the potential for increased power output by utilizing an exhaust gas to liquid heat exchanger. This would increase the incoming hot Zero external parasitic loads were taken into account for this evaluation. Parasitic loads include additional kWe use from condensing water pumps, hot water pumps, etc. are based on information available in the PEF. Re-evaluation of the project will be necessary if heat inputs/assumed inputs differs from actual. Engineer's Notes A 30-50 kWe Green Machine will be suitable for this project. water stream to the Green Machine, as well as increase the total amount of thermal power available. ElectraTherm does not provide exhaust gas heat exchangers; however, we can help you contact an exhaust gas heat exchanger manufacturer for this project. Estimated temperatures, heats, and flows used in analysis 30,584 27,624 30,584 29,597 30,584 29,597 30,584 30,584 29,597 30,584 29,597 30,584 42.3 42.3 42.3 42.3 42.3 42.3 42.3 42.3 42.3 42.3 42.3 42.3 26000 kWh 26500 kWh 27000 kWh 27500 kWh 28000 kWh 28500 kWh 29000 kWh 29500 kWh 30000 kWh 30500 kWh 31000 kWh 0 kWe 5 kWe 10 kWe 15 kWe 20 kWe 25 kWe 30 kWe 35 kWe 40 kWe 45 kWe Jan. Feb. Mar. Apr. May Jun. Jul. Aug. Sept. Oct. Nov. Dec.Estimated Net Energy Output Estimated Net Power Output Month Estimated Net Annual Energy Production 0 5 10 15 20 25 30 35 40 45 50 0 kWe 5 kWe 10 kWe 15 kWe 20 kWe 25 kWe 30 kWe 35 kWe 40 kWe 45 kWe 50 kWe Jan. Feb. Mar. Apr. May Jun. Jul. Aug. Sept. Oct. Nov. Dec.Ambient Weather Temperature (°F) Estimated kWe Power Output Month Estimated Annual Power Output Ambient Temperature Gross kWe Output Net kWe Output Parasitic Load (kWe) Available Heat: 902 kWth Hot Water Temperature: 200°F Hot Water Flow: 217 GPM Average Gross Output: 45.3 kWe Average Net Output: 42.3 kWe Average Ambient Temperature: 45°F 8000 Annual Runtime Hours 362268 Total Annual kWh One Line Heat Balance Diagram 200°F, 93°C 217 GPM, 13.7 l/s 179°F, 81°C 217 GPM, 13.7 l/s -610 kWth -2.08 MMBTU/hr Heat Rejected to Cooling Water Heat Consumed by Green Machine Feed Pump Twin Screw Expander Induction Generator Pre-Heater Evaporator Groundwater Average Gross Output: 45.3 kWe Average Net Output: 42.3 kWe 223 GPM, 14.1 l/s 200°F, 93°C 440 GPM, 27.8 l/s 189°F, 87°C -292 kWth -1 MMBTU/hr 440 GPM, 27.8 l/s 184°F, 85°C 45°F, 7°C 220 GPM, 13.9 l/s 62°F, 16°C 220 GPM, 13.9 l/s 520 kWth 1.78 MMBTU/hr Condensing Water Pump 1 Andrew Durham From:ElectraTherm <sales@electratherm.com> Sent:Thursday, August 16, 2012 5:04 PM To:398-4676 Sales Subject:[electratherm.com] Project Evaluation Form ElectraTherm Project Evaluation Form The following Project Evaluation Form was submitted on 8/16/2012 Units: standard Other Contact Info Customer Type: Other (Consulting Engineer) Company:Electric Power Systems, Inc Contact:Robert Whealy Address: 3305 Arctic Blvd. Suite 201 City: Anchorage State / Province: Alaska Zip: 99503 Country:United States Phone: 907-646-5132 Email: bwhealy@epsinc.com Project Details Project Name: Dutch Harbor Power Plant Waste Heat to Energy Project Description: Convert diesel engine jacket cooling water heat to electricity. Justification: green, costs, roi Hours Of Available Heat & Condensing Flow: 8000 HRS PER YEAR End User Electrical Cost: $0.42 (US) per average kWh Project Location City: City of Unalaska State / Province: Alaska Country:USA Heat Sources: liquid Liquid Heat Details Temp: 200 F Flow: 440 GPM Type: glycol ( 30%, Ethylene Glycol ) Source: engine 2 Average Engine Load: 70 Rate: 3080000 (BTU/hr) Other Heat Source Users: No Cooling Source: water Temp: 45 F Flow: 1000 GPM Source: other (Sea Water) Type: Ocean sea water Status:existing Other Cooling Source Users: No Verified: Robert W. Whealy, P.E. Notes: