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Kotzebue Electric Association Waste Heat Recovery & Power Renewable Energy Fund Grant November 10th 2008 4. Project Description and Tasks 4.1. Proposed Energy Resource Due to the high cost of thermal energy ($43/MMBtu), Kotzebue Electric Association already has an extensive waste heat recovery system in place. KEA utilizes two engine jacket cooling systems. The primary engine jacket water system from each engine is tied to a common loop system where the heat is captured in plate-fin heat exchangers. When any of the EMDs is running glycol circulates at roughly 1100 gpm. When a Caterpillar Gen Set is running an additional 350 gpm is being circulated. The entire system consists of approximately 25,000 gallons of a 50/50 glycol mix. Air box heat is dissipated by a four pass after-cooler system for the three EMD 710s. The heat is tied into a common radiator loop system. This is a low temperature system used to reduce NOx emissions on the EMDs. The jacket water system supplies heat to the KEA power plant, shops and office buildings, the city water lines, and to an absorption chiller designed by Energy Concept’s. KEA’s absorption chiller is powered by 165F jacket water from the diesel generators. The system utilizes a three pressure ammonia water absorption cycle. This system is capable of producing 10 tons of flake ice a day. The average daily thermal load is 15,000 kWh/Day. This is broken down into daily average as follows: District Heating Office Building: Power Plant: Warm Storage: Linemen Shop: Absorption Chiller: City Water System: 977 kWh/day 4088 kWh/day 2064 kWh/day 444 kWh/day 34 kWh/day 7307 kWh/day The diesel generators produce roughly over 19,000,000 kWh/yr of thermal energy while KEA consumes 5,500,000 kWh/yr. This leaves 13,500,000 kWh/yr of available thermal energy from engine jacket water alone. Utilizing the stack heat will provide an additional 15,000,000 kWh/yr of thermal energy. To summarize KEA currently utilizes 5,500,000 kWh/yr and has a remaining 28,500,000 kWh/yr to generate electricity or expand the district heating system. Page 21 of 48PDF Image | Alaska Energy Grant Renewable Energy
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