【摘要】 相变储热系统（LTES）可用于太阳能利用、建筑物调温、余热回收及电能错峰调节。本文将正三十烷(C₃₀)吸附到有纳米孔的多孔材料（可控孔径玻璃CPGs、硅胶SGs）中,制成定型纳米相变储热材料(nano-PCMs,C₃₀/CPG,C₃₀/SG)。用差示扫描量热法（DSC）测量其相变温度（储热温度）及储热密度,显示两者均与孔径成反比关系。通过调节多孔材料的孔径,C₃₀/CPG复合材料的储热温度最大可在6℃范围内调节,C₃₀/SG材料最大在近9℃范围内调节。该类材料过冷度与纯C₃₀比没有明显增加,熔化过程储热密度没有明显降低,使用过程形状固定、不会出现泄漏。实验结果,为石蜡类可调温度纳米储热材料的使用,提供理论依据。更多还原

【Abstract】 Latent heat storage system（LTES）can be used for collecting solar energy,temperature regulation for buildings,residue heat recovery and electric energy peak load shifting.In this paper,normal alkane triacontane(C₃₀)was loaded in the nanopores of porous materials,controlled pore glasses（CPGs）and silica gels（SGs）,and obtained form-stable heat storage materials(C₃₀/CPG,C₃₀/SG).The phase change temperatures（regulation temperatures）and heat storage capacities of the C₃₀/CPG and C₃₀/SG showed linear dependence on the reverse pore diameter.In the series of the nanopores,C₃₀/CPG displayed a regulation temperature window of about 6 ℃,and C₃₀/SG was around 9 ℃.These materials exhibited slightly increased degree of supercooling and decreased heat storage capacities,which had form-stable features and an advantage of free of leakage during thermal cycling.The above results can provide information for preparation of nanosized heat storage materials of paraffin with tunable regulation temperatures.更多还原