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Figure 7 (a) Rotary Regenerator (Source: PG&E, 1997), (b) Rotary Regenerator on a Melting Furnace (Source: Jasper GmbH, 2007) One advantage of the heat wheel is that it can be designed to recover moisture as well as heat from clean gas streams. When designed with hygroscopic materials, moisture can be transferred from one duct to the other. This makes heat wheels particularly useful in air conditioning applications, where incoming hot humid air transfers heat and moisture to cold outgoing air. Besides its main application in space heating and air conditioning systems, heat wheels are also used to a limited extent in mediumtemperature applications. They have also been developed for hightemperature furnace applications such as aluminum furnaces, though they are not widely implemented in the United States due to cost.15 They are also occasionally used for recovery from boiler exhausts, but more economical recuperators and economizers are usually preferred. 3.1.3 Passive Air Preheaters Passive air preheaters are gastogas heat recovery devices for low to mediumtemperature applications where crosscontamination between gas streams must be prevented. Applications include ovens, steam boilers, gas turbine exhaust, secondary recovery from furnaces, and recovery from conditioned air. Passive preheaters can be of two types – the plate type and heat pipe. The platetype exchanger (Figure 8) consists of multiple parallel plates that create separate channels for hot and cold gas streams. Hot and cold flows alternate between the plates and allow significant areas for heat transfer. These systems are less susceptible to contamination compared to heat wheels, but they are often bulkier, more costly, and more susceptible to fouling problems. The heat pipe heat exchanger consists of several pipes with sealed ends. Each pipe contains a capillary wick structure that facilitates movement of the working fluid between the hot and cold ends of the pipe. As shown in Figure 9 below, hot gases pass over one end of the heat pipe, causing the working fluid 15 Figure 8 Passive Gas to Gas Air Preheater (Source, PG & E, 1997)PDF Image | Waste Heat to Energy Tech Opportunities in US Industry
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