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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 22. Specific Heat at Different Temperatures for Different Concentrations Based on Weight Over its Corresponding Temperature Range [60]. Tetraethylene Glycol Tetraethylene glycol is also an odorless, transparent fluid made up of a large strand of hydrogen, oxygen and carbon which can be simplified to C8H18O5. This fluid has very similar physical and thermal properties to the triethylene glycol but it has a higher boiling point and is denser. Although the boiling point is high, the maximum temperature range for the fluid is set by the decomposition temperature which is known to be at 464°F. The same problems arise as with TEG because of water’s boiling temperature’s slow increase and rapid decrease in overall specific heat as this concentration is raised. The following figure shows the specific heat at different concentrations when mixed with water throughout their operational temperature range [59]. This figure is based on an operating pressure of 1 atmosphere and does not take into account the increased temperature range of water seen by increasing the pressure to 60 psig. 58 Cp (Btu/lbm‐F)PDF Image | TUDY OF LOW-GRADE WASTE HEAT RECOVERY
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