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Kotzebue Electric Association Waste Heat Recovery & Power 4.4.6.2.4. Challenges KEA doesn’t expect any major obstacles. However, any newer technology will have issues to resolve. VRB’s history of proactive O & M with the University of Alaska, Fairbanks Arctic Energy Technology and Development Laboratory enables KEA to be confident in VRB’s commitment to a project in Kotzebue. Communication lines are very open between project partners and this will continue as construction proceeds. 4.4.6.3. Waste Heat Recovery and Power 4.4.6.3.1. Objective The installation of a stack heat recovery unit and an ammonia absorption cycle waste heat power plant will allow KEA to fully utilize diesel fuel whenever the diesel turbines are in operation. Only one third of a fuel’s energy content is used for electricity generation. The remaining two thirds are turned into thermal energy or ‘waste heat’. KEA currently utilizes one third in its district heating system, water heating for the city’s water line, and in the absorption chiller which generates ice for the commercial fishing industry. The remaining third exits the exhaust stack. A heat exchanger can be installed in the stack heat to capture this thermal energy. Energy Concepts has designed a turbine which will generate 150kW from that ‘waste heat’. 4.4.6.3.2. Benefits The capital cost of this equipment is low relative to the benefits it provides. The simple payback for a waste heat project of this scope is under 2 years. This technology could be of great benefit to any village using diesel turbines. 4.4.6.4. Scope of Work Only one third of a fuel’s energy content is used for electricity generation. The remaining two thirds are turned into thermal energy or ‘waste heat’. KEA currently utilizes one third of that ‘waste heat’ in its district heating system, water heating for the city’s water line, and in an absorption chiller (designed by Energy Concepts) which generates ice for the commercial fishing industry. The remaining third exits the exhaust stack. A heat exchanger can be installed in the stack heat to capture this thermal energy. Energy Concepts has designed a turbine which will generate 162 kW from that ‘waste heat’. This turbine will be installed in the summer of 2009. The existing Absorption Chiller consists of outdated technology. Renewable Energy Fund Grant November 10th 2008 Page 42 of 48PDF Image | Alaska Energy Grant Renewable Energy
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