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TA 6M: Waste Heat Recovery Findings from Previous Reports Analysis of these previous studies along with direct contact with industry and equipment suppliers have shown that a significant amount of waste heat is not currently recovered across all temperature ranges, and there is an expanded need for R&D in two temperature ranges: ultra-low (<250°F) and ultra-high (>1,600°F). The lack of wide-scale heat recovery in these two temperature ranges appears to be primarily due to issues associated with technology, materials, and economics, such as the lack of economically justifiable measures and equipment to recover the low-grade heat, as well as heat contained in very high temperature and contaminated waste heat streams. In addition, for many existing WHR systems, especially in the medium-temperature range (600° – 1,200°F), there is an opportunity to further optimize these systems to improve the recovery rate and make the systems more cost-effective. For example, heat recovery opportunities are still available in the cement and glass industries, where exhaust gases from cement preheater kilns and recuperative glass furnaces are in the medium- to-high temperature range. Technology Assessment and Potential Commonly Used Waste Heat Recovery Systems Industry uses a wide variety of WHR equipment offered by a number of suppliers in United States and from other countries. Much of this equipment is designed for specific industrial applications. There is no standard method to classify this equipment; in many cases the manufacturers offer application-specific designs. The commonly used systems listed in this table are available from several suppliers to capture waste heat from a variety of industrial waste heat sources. While in most cases the systems are proven, the systems are continuously being improved in the following areas to offer better performance: Design changes to offer higher thermal efficiency and smaller footprint or size System cost reduction through improved design and manufacturing techniques Improved seals to reduce maintenance requirements and/or extend seal lifetimes Use of alternative materials to improve heat transfer performance or reduce maintenance costs Design changes to meet customer demands for different or previously untested applications A summary of conventional or commonly used WHR technologies for various temperature ranges is found in Table 6.M.6. 16 QuadrennialTechnologyReview2015PDF Image | Innovating Clean Energy Technologies in Advanced Manufacturing
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