Study On Absorption Refrigeration Performance Of Ionic Liquid Solution [EMIM][DEP]/H₂O

Absorption refrigeration or heat pump is a kind of device which is more and mo re widely used in refrigeration or heating. The performance of the equipment is deter mined by the working fluid system of the heat pump. At the present, The common w orking fluid used in heat pump has more or less limitation. For example, Although th e LiBr/H2O have the excellent advantage in aspect of the Absorption properties and pr ice. Its application is restricted by the defect of crystallization and corrsion. NH3/H2O is environment-friendly. however it is a dangerous, Poisonous and explosive material. accordingly, looking for a new type of solultion which is highly absorbent, drug-free and pollution-free and not corrode metal fittings have become the development trend o f absorption refrigeration technology.As an environmentally friendly new material, Ionic liquid have a huge advantage in absorption properties, no crystallization and no corrosion comparing with the traditi onal working fluid. In this article, the main research is the Imidazole-based [EMIM][D EP] whose full name is 1-ehtyl-3-methylimidazolium diethylphosphate. Basing on the k nown thermodynamic properties. This paper mainly finish the following several aspects of the work.Firstly, We set up the experimental device of the first absorption refrigeration and synthesize Ionic liquid. The solution of Ionic liquid is prepared in proportion. then ad d the ionic liquid to the device and debug the temperature and pressure.Secondly, caculate various COPc by changing the regenerator temperature, evapora tion temperature and cooling water temperature respectively and doing several sets of experiment, research the influence of operating conditions on the performance of heat pump. Calculate the total heat transfer coefficient K and COPc of the absorber tube b ased on the experimental data. The experimental results show that the performance coe fficient COPc decreases with the increase of the regeneration temperature, and increase s with the decrease of the temperature of the cooling water. the total heat transfer coe fficient K increases with the increase of the regeneration temperature and the evaporati on temperature, and decreases with the increase of the cooling water temperature.Finally, enhance heat pump's cooling effect by adding the Multi walled carbon n anotubes to the Ionic liquid and caculate the COPc and the total heat transfer coeffici ent K again. compare with the condition without nanoparticles. The experimental result s show that the addition of multi walled carbon nanotubes can significantly improve t he performance coefficient COPc and total heat transfer coefficient K of absorption r efrigeration.