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STUDY OF LOW-GRADE WASTE HEAT RECOVERY

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TUDY OF LOW-GRADE WASTE HEAT RECOVERY ( tudy-low-grade-waste-heat-recovery )

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away from the tube surfaces by a slight negative pressure which comes from the shell side of the condenser. This water can be reclaimed into a boiler as warm feed water or if a system other than a boiler is used, this energy can be recovered through a separate liquid to gas or liquid to liquid heat exchanger to be used for various applications [3]. The transport membrane condenser also possesses enhanced heat transfer attributes. The first major advantage is the introduction of convection heat transfer which tends to be a much larger factor in overall heat transfer than conduction. The second major advantage of the transport membrane condenser is that the condensed water is sent directly into the unit where less heat energy is lost to the ambient. Finally the transport membrane condenser always exhausts the stack gasses at a temperature below their dew point, less than 125°F, with basically no water vapor present. This characteristic prevents the stack from corroding and reduces the risk of water vapor condensing in the stack [40]. This technology is a relatively new concept for waste heat recovery and is currently only manufactured by one company who has gained exclusive rights to the technology [8]. This lack of competition and new technology aspect will inevitably increase the implementation cost. Although analysis conducted by Liu [40] claims that based on their economic analysis a simple payback period of less than one year is achievable. This product is currently available for sale in the 200 to 400 boiler horsepower range and sizes are expected to be available for 400 to 800 boiler horsepower sometime within the year 2011 [7]. Heat Pumps Heat pumps can be used in heat recovery applications to increase the temperature of the recovered fluid by adding additional work input. This increased temperature can be 41

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