Preparation And Performance Study Of Organic Phase Change Coolant Used In Cold Chain

Phase change energy storage is an important branch of energy science and technology.In the process of energy conversion and utilization,there are often contradictions between supply and demand in terms of time and space,such as the peak-valley difference of electrical load,the gap between solar energy,wind energy and ocean energy,and the interruption of industrial kilns Run and so on.Energy storage technology is currently an effective means to solve the contradiction between energy supply and demand in time and space and improve energy efficiency.In this paper,by comparing the advantages and disadvantages of different cold storage methods,we found that the cold storage technology of organic phase change materials has broad prospects,and selected decanoic acid,methyl laurate,decan-l-ol,lauric acid,and tetradecane as substrates.Binary compounding is carried out to prepare binary mixed phase change materials suitable for cold storage and cold chain transportation.The main work of this article:(1)Thermodynamic analysis of five single organic compounds,decanoic acid,decan-l-ol,methyl laurate,lauric acid,and tetradecane,was performed by two instruments,differential scanning calorimeter and Fourier infrared spectrometer.The results show that these five substances have suitable phase transition temperature and higher latent heat of phase transition,and can be applied to prepare binary organic compounds.(2)According to the phase change enthalpy of a single substance,the minimum melting temperature of the binary organic compound and the corresponding molar ratio of the components can be calculated by the thermodynamic formula.The calculation results show that:decanoic acid/methyl laurate,decanoic acid/decan-1-ol and lauric acid/tetradecane,the theoretical phase transition temperature of these three binary organic compounds are around 0?.The differential scanning calorimeter was used to measure the phase transition temperature and phase change enthalpy of these three binary organic compounds.It was found that there was no deviation from the theoretical calculation results.The experimental results temperature of these three binary compounds is 0?8?,the latent heat Between 160?200J/g(3)Since the binary organic compound is a solid-liquid phase change during the phase transition process,in order to prevent it from leaking in the actual application process,it is adsorbed with poly-N-Isopropylacrylamide gel.A series of poly-N-Isopropylacrylamide gels were synthesized by using Poly(ethylene glycol)with different molecular weights as pore-forming agents.The molecular weight and quantity of pore-forming agents were investigated The effect of compound adsorption.The experimental results show that when Poly(ethylene glycol)is used as a gel pore-forming agent,it does not participate in the chemical reaction of gel formation;the larger the molecular weight of Poly(ethylene glycol),the larger the pore size of the resulting poly-N-Isopropylacrylamide gel;When Poly(ethylene glycol)1000 is used as a pore agent,poly-N-Isopropylacrylamide gel has the highest adsorption rate for binary organic compounds.The experimental results of this paper show that gel compounding can improve the cold storage performance of binary organic phase change materials and solve the leakage problem;the addition of polyethylene glycol is beneficial to improve the swelling degree of the gel in phase change materials.