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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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with current electricity prices. The final piece of equipment critical to the success of a waste heat recovery system is the pump. The pump allows the energy recovered from the hot exhaust gas which has been transferred into a fluid to be transported throughout the facility and to be consumed for useful applications. A centrifugal style pump is recommended in most applications and can provide adequate flow and efficiency for most types of heat recovery systems. Another major contributor in the recovery of waste heat is the energy transportation fluid. The selection of this fluid will determine the amount of energy allowable that can not only be recovered but how much can be delivered to the end use. There are many different types of fluid available for this transportation however certain types have better characteristics under certain situations. The most common and abundant type of transportation fluid is water because it contains a high density and specific heat, but this fluid has certain limitations when a single phase flow is desired. Water contains a low boiling point and is limited in application by this. Additives have been developed to increase this boiling temperature but do not substantially increase it until large concentrations are seen. This fact decreases the benefit of using water as the heat transportation fluid because the additives contain much lower heat storage characteristics. Alternatives are available that contain much higher boiling points however the same energy transportation characteristics cannot be seen. These types of thermal heating fluids include DOWTHERM G, UCON HTF 500 and Therminol XP. DOWTHERM G contains the highest operating temperature of 675°F but UCON HTF 500 possesses greater lower temperature characteristics. A waste heat recovery system was designed that takes into account the different types of considerations discussed. This system provides the opportunity to recover energy from a 400 hp 122

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