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viscosity, low volatility, high boiling point and is soluble in water and is also able to mix with other organic fluids. This property of the fluid can be used to enhance the heat transfer characteristics of certain fluids when needed. The boiling point of the fluid at atmospheric pressure is 550°F setting an upper limit on the usage of this fluid as an enhancement to an organic fluid. The fluid is considered chemically stable and will not decompose under normal circumstances. It is also non-corrosive to materials used in a typical distribution system. However, the boiling point of water is not greatly increased until the concentration becomes about 80% to 90% of the total weight and really doesn’t increase substantially until all the water is removed. This becomes an issue because the specific heat of the triethylene glycol is much smaller than that of the water, taking away the advantage of using water as the heat transporter. The following figure describes this by showing different concentrations of triethylene glycol with water, based on weight, over its working temperature range [60]. 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. As can be seen in Figure 21, the specific heat of the mixture continuously decreases as more and more triethylene glycol is added. The only possible advantage that the TEG contains is when no water is present and even though the specific heat of the fluid is still smaller, the temperature range is greatly increased to the boiling point of 550°F. 57PDF Image | TUDY OF LOW-GRADE WASTE HEAT RECOVERY
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