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Cleanliness of exhaust gases– they should not be used when the gases contain large amounts of particles or condensable vapors They cannot be used if there is no need for steam in the plant They are not recommended when the gas mass flows vary over a period of time – use of auxiliary heat can be expensive and economically unjustifiable Low- to Medium-Temperature Heat Recovery Equipment Heat Wheels A heat wheel is finding increasing applications in low- to medium-temperature waste heat recovery systems, usually limited to about 600°F (315°C). The wheel itself is a sizable porous disk, fabricated with material having a fairly high heat capacity that rotates between two side-by-side ducts: one is a cold gas duct, the other a hot gas duct. The axis of the disk is located parallel and on the partition between the two ducts. Exhibit A-7: Typical Heat Wheel Type Waste Heat Recovery Unit As the disk slowly rotates, hot air transfers sensible heat (moisture that contains latent heat) to the disk by the hot air and from the disk to the cold air. The overall efficiency of sensible heat transfer for this kind of regenerator can be as high as 85%. A variation of the heat wheel is the rotary regenerator where the matrix is in a cylinder rotating across the waste gas and air streams. The heat or energy recovery wheel is a rotary gas heat regenerator, which can transfer heat from exhaust to incoming gases. Its main area of application is where heat is exchanged between large masses of air having small temperature differences. The heat wheel system requires good seals between the higher pressure air being heated and the lower pressure exhaust gases. Reliability of seals and plugging up of the gas passages have been the major draw backs of a heat wheel. These systems are most commonly used for preheating combustion air for boiler. Their use is very limited for industrial furnaces other than low temperature ovens. Heat Pipe Industrial Waste Heat Recovery Page 49PDF Image | Industrial Waste Heat Recovery: Potential
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