Experimental Investigation On Thermophysical Properties And Heat Transfer Characteristics Of LiBr Solution Adding Nano-Particles

With the development of Nanotechnology, nanofluids became one research focus of academic circles.Adding proper nano-particles in inorganic salt solution, influence were made on thermal characteristics and Transfer Property.Based on research on stability adding proper nano-particles in LiBr solution, with gravity sedimentation and spectrophotometer method. Optimum proportion of nano-particles and dispersant were determined through experiment. Putting up experimental table measuring generating temperature of LiBr Solution,Generating temperature of LiBr Solution adding nano-particles were measured under atmospheric pressure, The influencing factors of nanoparticles and dispersant influence were adjusted, the result showed it decreased obviously.As the lower generating temperature, energy utilization efficiency of the whole unit was improved, the heating temperature of the heat source decreased, made the application of low-level heat source on absorption refrigeration system more feasible, such as heat of wastewater, waste gas and solar energy. And reduced the auxiliary heat source, so the application field on energy-saving and emission reduction of lithium bromide absorption refrigeration system was extended. The surface tension of lithium bromide solution adding nano-particles was tested, the reasonable explanation was given.Viscosity influenced the flow of fluids obviously, viscosity of LiBr Solution adding nano-particles was measured under different temperatures, newtonian fluid was verified with Nano-Particles under low concentration。Putting up heat transfer experimental table of LiBr solution under atmospheric pressure,through contrast experiment with and without Nano-Particles in LiBr solution of 58% concentration, variation of heat transfer coefficient with Nano-Particles was mearsured. Heat transfer coefficient of solution were analyzed in the same Re and velocity. The result showed: in the same Re, heat transfer coefficient increased a lot ,in the same velocity,effect was not obvious,changed the base fluid temperature,the same research was done.With the coefficient of convective heat transfer of LiBr Solution increased,it is meaningful to deduce the heat exchange area of absorber and generator ,to reduce the cost of equipment,to increase heat and mass transfer efficiency.