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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Discussion of System Design This particular type of system design was selected to separate the higher temperature energy recovered from the lower temperature energy. This design combines both the second and third concepts which were discussed earlier. This separation is accomplished by creating two entirely separate loops, one with the energy flowing directly into the thermal storage tank and the other delivering energy first into the process before returning through a thermal storage tank at the end. The first heat exchanger recovers energy from the stack gas and delivers the fluid at a temperature of 400 °F to the tank. This energy is transferred into the thermal storage tank and changes the phase of the enclosed materials at a temperature of 327°F while continuing to add additional energy into the system up to the fluid supply temperature. The second heat exchanger (condensing) sensible energy, used for the absorption chiller loop, is setup to supply energy to the process equipment first and, when the appropriate temperatures are available in the return line, the heating fluid is delivered through a second thermal storage tank. This type of system was selected for the condensing heat exchanger loop because there is a demand for the recovered energy fluid temperature and to separate the lower temperature fluid from the higher grade energy delivered from the initial heat exchanger. By separating the fluid streams into a high temperature loop and a low temperature loop, higher temperature end-use applications are possible and provide more overall opportunities for energy savings. Energy and Monetary Savings The energy savings that can be expected from implementing a system similar to this one described is found by determining the total amount of energy which can be offset by the recovered energy. This can be estimated by considering the approximate hours each year each 110

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