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TA 6M: Waste Heat Recovery Waste Heat Recovery: Technology and Opportunities in U.S. Industry4 The Waste Heat Recovery: Technology and Opportunities in U.S. Industry report provides information on waste heat sources in major industrial sectors. The report details the nature of waste heat; available WHR equipment currently used by the industry; and research, development, and demonstration (RD&D) needs. The report classifies waste heat sources in three categories: high temperature (>1,200°F), medium temperature (450°F – 1,200°F), and low temperature (<450°F). The study investigated a range of industrial processes, consuming a total of ~8,400 TBtu/yr, as a basis to estimate WHR opportunities. Estimates of total unrecovered waste heat are shown in Figure 6.M.3, which indicates that the majority of waste heat losses (based on a 77°F [25°C] reference) are in the low temperature range. Though low temperature waste heat is lower quality, it is present in sufficiently large magnitudes that its work potential exceeds that of other waste heat sources. For the sectors and uses examined, this study also identified unrecovered waste heat in different temperature ranges, concluding that the amount of heat wasted in U.S. industry above a 300°F reference temperature is 276 TBtu per year, whereas 1,478 TBtu per year is lost if the reference temperature is lowered to 77°F.13 This indicates significant heat recovery opportunities in the 77°F - 300°F temperature range, which represents more than 80% of the total estimated waste heat. Cost-effective technologies need to be advanced in order to access the energy savings from low temperature waste heat. Figure 6.M.3 Unrecovered Waste Heat in Different Temperature Groups (2002).4 The temperature groups are defined as: High – 1200°F [650°C] and higher; Medium - 450°F [230°C] to 1,200°F [650°C]; and Low - 450°F [230°C] and lower. Comments on the report Waste Heat Recovery: Technology and Opportunities in U.S. Industry4 for the purposes of this Technology Assessment: Analysis of waste heat sources and recovery is greatly affected by the waste heat temperature. Therefore it is necessary to clearly identify the temperature regimes for waste heat related discussions. While this study identifies three temperature ranges to classify waste heat sources and opportunities, there is no general agreement on or basis for this definition of the temperature ranges. The report identified a range of key unit operations across industrial sectors from which WHR estimates were based (see Figure 6.M.4). 6 QuadrennialTechnologyReview2015PDF Image | Innovating Clean Energy Technologies in Advanced Manufacturing
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