The Preparation Of Microencapsulated Paraffin And Research Of The Effected Factor

In recent years, people attach more and more importance to phase-change energy storage, as the exacerbating of energy crisis. Phase-change energy storage is one of efficient ways of storing energy. It can solve the problem of the disagreement of energy supply and demand in time or space. It can improve the efficiency of energy utilizing. Paraffin is a kind of phase change materials and has a lot of merits being widely used in industry. But it has the disadvantage of volume changed greatly when changing phase, low efficiency of heat transfer as well as leakage. Microencapsulated paraffin can solve problems hereinbefore be widely researched in recent years.In this thesis, certain paraffin is chosen by the DSC test for core material, which is adapted to solar energy utilizing and the other thermal storage system; urea-formaldehyde polymer is used as wall material. Urea-formaldehyde microencapsulated paraffin by means of situ polymerization. It is hoped to be added into heat transfer fluid of solar energy utilizing and other thermal storage system, to increase the specific heat of fluid. Experiments are done to study the effect of these factors, such as emulsifier, Nad, core/wall ratio, on the performance of microencapsualtion. The results of experiment are analyzed, and the guidance is brought up to develop industrial production and new thermal storage material.