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Waste Heat to Energy Tech Opportunities in US Industry

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Waste Heat to Energy Tech Opportunities in US Industry ( waste-heat-energy-tech-opportunities-us-industry )

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where Q is the useful heat output from heat pump, and W is the work input. ­ 0.72 million Btu (fuel to power plant) 0.78 million Btu Low T waste heat input 0.25 0.22 million million Btu Btu Power Plant Generation (Efficiency 0.343) Electricity Transmission (Efficiency 0.9) Heat Pump COP 4.5 1 million Btu Heat to process units Boiler using fossil fuels 1.25 million Btu 1 million Btu (fuel to boiler) Heat to Process units Boiler (Efficiency 0.8) Figure 16 ­ Energy Losses from a Boiler versus a Heat Pump. Note: The heat pump receives heat from a low­temperature source and rejects it at a higher temperature. The heat pump uses waste heat plus an additional 0.22 million Btu of electrical energy to provide 1 million Btu of useful heat, while the boiler requires an input of 1.25 million Btu to provide 1 million Btu of steam heat. An important consideration in determining the feasibility of heat pumps is the waste heat temperature and the desired “temperature lift.” The type of cycle used and the type of working fluid chosen will influence the temperatures at which the heat pump can receive or reject heat, as well as determine the maximum temperature lift achievable. The efficiency of a heat pump decreases as the desired temperature lift increase. An overview of different heat pump types, their operating parameters and associated costs is provided in Table 6. Research to develop advanced cycles and novel fluids to increase heat pump performance and flexibility in different temperature ranges could enhance the use of heat pumps for waste heat recovery. 22 ­

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