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Different Design Scenarios It is simply not true that all heat recovery applications will be able to use the previous design. Some facilities will have a variable demand while others will have a much larger source of waste heat and are able to effectively produce electricity. In the case that the system does not operate in the same manner as the previous design applies to, a few design tips for different operating points are discussed below. The first variation that is considered is a furnace operation that has a changing energy input rate. This variable energy input rate will ultimately change the amount of recoverable energy in the exhaust stack by not only changing the temperature of the gas but also the volumetric flow rate. This change will not necessarily be directly proportional to the amount of energy input because furnaces tend to become less efficiently controlled as the firing rate is reduced, leading to more volume of flow but also a lower temperature. While the furnace will be exhausting gas at a lower temperature, the end uses of the system will still require a minimum temperature to operate. The previous analysis assumed a constant exhaust temperature and also a constant flow of heating fluid throughout the system. This simplifies the design of the pumps to only having one operating flow rate and a constant speed motor is all that is needed. In the situation where the exhaust temperature is not constant, a variable speed drive is recommended to be added to the pumps to vary the flow rate of the fluid to maintain the minimum temperature required. This type of system also increases the importance of the thermal storage tanks because the supply and demand will not be constant. By adding a thermal storage tank to the loop, this energy can still be recovered when it is available, stored in the latent heat of the phase change materials in the storage tank and then used by the processes as needed. 118PDF Image | TUDY OF LOW-GRADE WASTE HEAT RECOVERY
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