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The first major parameter that should be considered is the maximum operating temperature of the fluid and the minimum value should be based on the expected temperature of the waste heat which is being recovered. For the following comparisons, both triethylene glycol and tetraethylene glycol are taken to be at 100% concentration and not mixed with water. The following figure shows a plot of each fluid discussed maximum operating temperature. Figure 27. Maximum Operating Temperatures for Heat Transfer Fluids. Another major parameter that becomes important in the design of the entire system is the fluid’s viscosity. The viscosity of a fluid is basically how much resistance a fluid has to shear or tensile stress and directly relates to the ease of the fluid to be pumped through a network. So the higher the viscosity of the fluid, the more difficult it is for a pump to move the fluid throughout the system which leads to increased pumping horsepower and more energy usage. The following 700 600 500 400 300 200 100 0 Water Triethylene Glycol Tetraethylene DOWTHERM Glycol G UCON HTF 500 Therminol XP 65 Maximum Temperature at 1 atm (F)PDF Image | TUDY OF LOW-GRADE WASTE HEAT RECOVERY
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