The Application Of Phase Change Materials In The Blood Vaccine Developed As Well As Phase Change Energy Storage Technology In The Transformation Of Forces Cold Storage Container

Phase Change Materials(PCMs)is the hot topic of international material research in the latest years. Phase Change Energy Storage Technology can solve that the energy supply do not match the contradictions in time and space.So it is an effective means of improving energy efficiency. Phase change energy storage technology apply to the biological, pharmaceutical, food refrigerated transport,and is rising as a running mode for cold chain logistics industry. It has changed refrigerated cars in the past which based high-energy way of cold chain logistics, become an exploration of economic growth which transform to the energy saving direction for cold chain logistics. However, the existing refrigerator car equipped with phase change materials are mainly for water storage matrix and eutectic salt mixture,exist Phase transition temperature limitations (can only reach below 0℃), poor thermal conductivity, uniform interpretation of such defects can not meet the blood (3℃～6℃) and vaccines (2℃~ 8℃) for storage and transportation needs.Through analyzing the shortcomings that exist on the current force refrigerated transport equipment for blood and vaccines, such as field storage and transportation of blood containers, field medical refrigerator, field blood car,cold storage containers and so on,this article put forward to let phase change energy storage technology apply to the cold storage containers upgrading and solve the problems of current force blood, vaccines storage and transportation equipment effectively. At first,this paper studied and selected the main cold storage agent, anti-cold agents of CTESM that apply to blood, vaccine storage and transportation and aimed to develope a sort of phase change thermal storage material which have suitable phase transition temperature, high latent heat, low cold cost, non-toxic, harmless and can be widely used in blood,vaccine storage and transport equipments; then in order to improve the thermal conductivity of phase change materials,this paper designed a new type of phase change energy storage device which combined with foam copper and its thermal properties were analyzed; Finally, by using the numerical simulation method to calculate and analyze flow and temperature field in the main air duct temperature zone of cold storage container which have assembled phase change energy storage devices, a reform program structural map was proposed.According to the literature data and phase-change material selection criteria, the 14 carbon paraffin was thinked as the main candidate materials for energy storage agent. By using of DSC thermal analyzer measure the latent heat and phase transition temperature of 14 carbon paraffin, the basic conclusion is 14 C paraffin meet blood, vaccine storage and transportation requirements.By adding nucleating agents such as NaCI,NH4Cl,C2H2O4,Fe2 (SO4) 3,Na2B4O7·10H2O,Diatomite,SiO2,AgI and so on,to the solution and prodeeding DSC measure, founded that AgI is the best improvement to water phase change characteristics,that can better improve the phenomenon of cold water solution, and could be used as a artificial nucleu of storage agent.Different porosity foam copper composited with phase change materials will form the composite phase change materials,which have different thermal conductivity. Integrated temperature region of thermal conductivity with the main overall storage requirements, this storage device set the porosity of the foam is 95%. Because phase change materials have large volume expansion during solidification, in order to prevent the device burst, water was selected to replace the used phase change material,due to close density to the phase change material ,and 90%, 87%, 85% of perfusion applied to freezing - melting loop experiment.The results showed that 90% and 87% of the perfusion test samples, respectively, exist varying degrees of damage, while 85% of the perfusion experiment sample is relatively normal.Therefore, the optimal perfusion volume for the phase change materials to the device was determined with the 85% of effective interior space. Carried out charging experiment and the cold temperature test under power comparison experiment for sample, obtained the temperature profile and then discussed its heat transfer test performance.The results show that the phase change energy storage devices filled with foam copper have uniform internal temperature, and good thermal insulation properties and meet insulation requirements.The transformation of the cold storage containers mainly focus on the air duct in the main temperature zones. Using CFD software modeling tool GAMBIT and FLUENT, according to the interior of air duct, three cases were proposed and numerical simulated respectively ,which is without energy storage tubes and return air ducts, possession of storage tubes and without return air ducts, possession of storage tubes and return air ducts. In installation of return air duct,the number and arrangement of storage tubes were corresponding optimal designed. Then aiming at that the energy storage device without return air ducts can not proceed the full charge of cold,a experiment of numerical simulation was conducted by the installation of air return ducts.The results show that the case that there are return air ducts and storage tubes meet the storage needs for blood and vaccines, but the fans need to step up the pressure. According to the above study ,the air duct modification chart in the main temperature region was proposed.