Progress of experimental study on additive drag reduction in air conditioning chilled water system

Chilled water transport energy consumption occupies a large proportion of the air conditioning system energy consumption. The rational utilization of the additive can reduce the flow resistance drastically, and achieve the purpose of energy saving. According to the lack of research on additive drag reduction in low temperature system, designs a low-temperature additive drag reduction experiment rig ranging from 5 ℃ to 15 ℃, for the additive selecting and drag reduction effect study. Takes drag reduction experiments for the mixed additive of cetyl trimethyl ammonium chloride (CTAC) and dodecyltrimethyl ammonium methyl sulfate（BTMS）. The results show that the drag reduction effect of the mixed additive is much better in the range of 5 ℃ to 15 ℃. The maximum drag reduction percentage is up to 68%, when the mass friction of the additive is 400×10-6, the fluid temperature is 15 ℃, and the diameter of pipe is 15.66 mm.