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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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The following report has been compiled to provide a guideline for designing a waste heat recovery and transportation system in an industrial facility. The overwhelming availability of waste heat in the United States demonstrates the inefficiencies and the wasteful practices currently used in the industrial sector. These inefficiencies are estimated to be anywhere between 20% and 50% of the total energy purchased. This wasted energy does not only cost the manufacturer extra money to operate, it also adds an additional environmental impact. This impact is not just from excess CO2 production but from a steady source of high temperature exhaust gas flowing into the atmosphere. To assist in recovering and determining the possible uses for this recovered energy, background information and recommended uses for waste heat recovery equipment are given. Additionally, thermal heating fluids and phase change materials which can be used to transport and store this recovered energy are discussed. A sample design of this energy transport system, along with end uses is provided to demonstrate the method required to determine the possible energy and cost savings impact. This design system includes recovering the energy from 485°F exhaust air flowing at 4,050 cfm and distributing this energy throughout the plant to perform several different tasks. These tasks include heating of occupied spaces, domestic hot water production, maintaining a minimum temperature in 14 glue baths, powering an absorption chiller to provide year round cooling and preheating boiler feed water. The remaining energy is then stored in two thermal storage tanks, one for the sensible heat exchanger loop and one for the condensing economizer loop. The design shows a rough implementation cost based on the material and labor cost to demonstrate a typical payback period. The information provided throughout the report is intended to inform the reader of the overall impacts of wasted heat energy while providing options and methods for recovering this wasted energy. 2

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