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longer effective the section of the heat exchanger can be disposed of and cheaply replaced. Another typical construction is to have a standard heat exchanger with stainless steel tubes or plates that are able to withstand the corrosive elements. This heat exchanger, with carbon steel tubes for the majority of the heat exchanger and stainless steel tubes for the cold end, contains this stainless steel end would take the place of the throwaway section described earlier. Finally using nonmetallic tubes in a heat exchanger can be used. This material can be glass or Teflon but both have large limitations in feasibility [24]. The shell-and-tube condensing heat exchanger is typically configured to route the condensing, low temperature fluid, in the tubes with the hot gas flowing through the shell [71]. Transport Membrane Condenser Because of the relatively low temperatures that are required to condense the water vapor from the exhaust gas, large surface areas are required for typical condensing heat exchangers to be effective. The transport membrane condenser has been developed as a more compact alternative. The transport membrane condenser operates by removing the water vapor from the exhaust gas by selectively extracting the low pressure water vapor into small pores in the nanoporous ceramic membrane, in liquid form, through pore capillary condensation and also through the cooling effect of cold water on the shell side of the condenser. Because the water is recovered by transport through a membrane, the water recovered is pure and does not contain many of the impurities that can be found in condensed water from a traditional condensing heat exchanger. This property makes this system a perfect candidate to be used when preheating feed water in a boiler system or to replace a hot water generator. The following figure shows this basic process when configured into a boiler system [40]. This system is not limited to only boiler systems and can be used for any type of combustion process where the latent heat from water vapor is desired 39PDF Image | TUDY OF LOW-GRADE WASTE HEAT RECOVERY
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