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 remaining capacity for each loop can be stored in an energy storage tank and used to supply intermittent, high demand systems. For the higher temperature energy recovered, the process that will receive the additional, stored capacity operates for two hours at a time, once at noon and again at midnight. This system requires a high demand of hot water and will be supplemented by the storage tank while the remaining demand will be met by an additional natural gas fired hot water heater. The excess energy stored from the lower temperature, condensing economizer storage tank will be used to offset costs of the cleaning process of equipment at the end of each shift where the use of hot water is required. The previous analysis has shown that it is possible to operate the absorption chiller for the bead room on only the sensible energy recovered from the condensing economizer. This energy recovered will provide the minimum supply temperature of 266°F to the chiller and allow for sufficient energy to achieve nominal ratings. This fact leads the design to add an additional loop in the system for solely the condensing heat exchanger energy recovered. This separate system will lead to a lower implementation cost for each energy storage tank and less total flow rate through the other system. This type of design will also allow for a higher operating temperature to be achieved by the first heat exchanger loop because the two streams will not become thermally mixed. This will accommodate a wider range of possible end uses by supplying higher grade energy to systems that require this type of energy while still providing sufficient energy and temperature to other processes. On this separate loop, the sensible energy will be directed from the condensing economizer into the heat transfer fluid which will be pumped to the absorption chiller where the required energy will be used in this process. The remaining energy content in the heat transfer fluid will be sent through a plate-and-frame heat exchanger to preheat the incoming feed-water to the boiler and then through the heat storage tank to recover any 97

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