摘要
从十四烷、月桂酸、月桂酸甲酯、正癸醇、正癸酸、水杨酸乙酯6种有机物中初步筛选复配物质,通过热力学公式计算二元复配物的理论配比和相变潜热,选取合适温度且相变潜热较高的复配物质,以DSC进行相变特性评价和稳定性测试。结果表明,正癸酸/月桂酸甲酯、正癸酸/正癸醇、月桂酸/十四烷、月桂酸甲酯/月桂酸等组合的Onset温度范围为0~4℃,相变潜热在150~210 J/g之间,符合目标Onset温度0~6℃并具有较高相变潜热的要求;相变潜热最大且共融性和稳定性最好的二元复配物是月桂酸/十四烷(质量比3.12∶96.88),Onset温度4.03℃,相变潜热207.05 J/g;热物性性能较好且成本较低的是月桂酸/十四烷(质量比6.17∶93.83)和正癸酸/十四烷(质量比22.68∶77.32),Onset温度分别为3.89℃和3.19℃,相变潜热分别为192.61 J/g和189.21 J/g;相变可调规律性良好的二元复配物是正癸酸/正癸醇,正癸酸质量分数在34.51%~47.24%之间变化时,Onset温度为0.96~3.60℃,相变潜热为155~171 J/g。
Phase change materials（ PCMs） have been a main topic in research in recent years,but although the information is quantitatively enormous,it is widely spread in the literature. The storage of latent heat in organic matters could provide a great density of energy storage with a small temperature difference between storing and releasing heat. Six kinds of organic matters,including tetradecane,lauric acid,methyl laurate,decanoi,decanoic acid and ethyl salicylate were selected as experimental materials for development of phase-change coolant for non-freezing cold chain. The thermodynamic formula was used to calculate the onset temperature and latent heat of designed compounds. DSC and stability tests were used for the selected compounds with the appropriate onset temperature and high latent heat. DSC was used commonly and it was the most authoritative method of determining phase change properties until now. The results showed that decanoic acid/methyl laurate, decanoic acid/decanoic, lauric acid/tetradecane,methyl laurate/lauric acid had onset temperature range of 0 ~ 4℃,latent heat of 150 ~210 J/g,which met the requirement of non-freezing cold chain at low temperature. In these PCMs,lauric acid/tetradecane（ mass ratio 3. 12 ∶ 96. 88） had the optimal performance,with onset temperature of 4. 03℃ and phase change latent heat of 207. 05 J/g; lauric acid/tetradecane（ mass ratio of 6. 17∶ 93. 83）and decanoic acid/tetradecane had a good performance in thermal properties and cost, with onset temperature of 3. 89℃ and 3. 19℃ and phase change latent heat of 192. 61 J/g and 189. 21 J/g,respectively; decanoic acid/decanoic（ mass fraction of decanoic acid was 34. 51% ~ 47. 24%） was selected for its relatively wide range of adjustable onset temperature. The above PCMs owned broad application prospects.
出处
《农业机械学报》
EI
CAS
CSCD
北大核心
2017年第8期309-314,共6页
Transactions of the Chinese Society for Agricultural Machinery
基金
国家高技术研究发展计划(863计划)项目(2012AA101704)
关键词
相变蓄冷剂
复合有机物
非冷冻低温区
冷链
phase change materials
compound organics
non-freezing low temperature zone
cold chain
