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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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1.2 1.1 1.0 0.9 0.8 0.7 0.6 0.5 0.4 20% 40% 60% 80% 90% 100% Water 0 100 200 300 Temperature (F) 400 500 Figure 23. Specific Heat at Different Temperatures for Different Concentrations Based on Weight over its Corresponding Temperature Range [59]. DOWTHERM DOWTHERM is an organic fluid developed by The Dow Chemical Company and is used as a heat transfer fluid in heat recovery applications. The fluid comes in different mixtures and can be used for temperatures of up to 700°F. DOWTHERM G is a blend of di- and tri-aryl compounds and offers the most attractive heat transfer and temperature range characteristics of the available mixtures of the DOWTHERM line of products. It is recommended for temperatures from 20°F to 675°F and remains in a liquid state a pressure of 48.8 psig at this temperature. However, DOWTHERM G is a flammable material and has an autoignition temperature of 810°F therefore the material should not be used if the process temperature is ever to reach above the recommended temperature range to avoid ignition of the fluid. The fluid is noncorrosive with common metals even when operated at high temperatures and most corrosion issues arise from chemicals infiltrating the system through cleaning or process leaks. The fluid 59 Specific Heat (Btu/lbm‐F)

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