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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has a density of 56.5 lb/ft3, a specific heat of 0.524 Btu/lbm-°F and a dynamic viscosity of 0.004 lbm/ft-s at 400°F. The following charts show these values at different temperatures in the fluid’s operating range [14]. 0.7 0.65 0.6 0.55 0.5 0.45 0.4 0.35 0.3 0 70 65 60 55 50 45 40 Specific Heat Density 100 200 300 400 500 600 700 Temperature (F) Figure 24. DOWTHERM G Specific Heats and Density at Different Temperatures [14]. UCON HTF 500 UCON HTF 500 is another heat transfer fluid manufactured by the Dow Chemical Company which is suitable for temperatures up to 500°F and is a polyalkylene glycol based fluid. This heat transfer fluid offers high initial heat transfer efficiency and does not produce a large amount of buildup in the pipes compared to petroleum based products which would prohibit heat transfer throughout the life of the system. The fluid is fully compatible and noncorrosive with most common metals that are used for piping and fittings such as steel and copper. It does, however, require the distribution system to contain a continuous vent to minimize the risk of system over pressurization and/or pump cavitation. The important physical properties of this fluid are quite 60 Specific Heat (Btu/lbm‐F) Density (lbm/ft^3)

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