Abstract In this study, the heat of dissociation of tetra-n-butyl ammonium bromide (TBAB) semi-clathrate hydrates (SCH) together with thermal conductivity and specific heat of both TBAB aqueous solution (AQS) and solidified AQS (SAQS) was measured for various weight fractions of AQS ( w TBAB ) ranging from (0.050 to 0.400). AQS and SAQS properties were measured by varying temperature from (283.2 to 308.2) K and (243.2 to 283.2) K, respectively. Thermal properties of AQS, SAQS, SCH, and clathrate hydrates slurry (CHS) have been reported. Subsequently charging and discharging characteristics of 0.400 w TBAB was studied in (42, 51, and 64) mm diameter spherical enclosures. Effect of diameter and wall temperature on charging characteristics were investigated, and the effect of diameter on discharging characteristics was explored. All the properties of AQS along with thermal conductivity of SAQS are influenced more by a change in w TBAB than by a change in temperature whereas, the reverse trend is observed for specific heat of SAQS. Thermal conductivity of SAQS and specific heat of AQS showed minimal variation while changing temperature, whereas specific heat of SAQS showed minimal variation while altering the w TBAB . Supercooling property of SCH had a significant effect on charging performance, and supercooling degree of SCH depend on wall temperature. Change in diameter does not affect the supercooling degree of SCH. In a spherical enclosure, SCH melts eccentrically. Charging and discharging rate of SCH increases with an increase in diameter. Based on this, it is found that a higher diameter capsule provides better charging and discharging performance.

中文翻译：

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热性能、充放电特性符合国际惯例。四正丁基溴化铵半笼形水合物用于空调冷库和二次制冷剂的特性研究

摘要 本研究测量了四正丁基溴化铵 (TBAB) 半笼形水合物 (SCH) 的解离热以及 TBAB 水溶液 (AQS) 和固化 AQS (SAQS) 的热导率和比热。对于 AQS 的各种重量分数 (w TBAB)，范围从 (0.050 到 0.400)。AQS 和 SAQS 特性分别通过将温度从 (283.2 至 308.2) K 和 (243.2 至 283.2) K 变化来测量。已经报道了 AQS、SAQS、SCH 和笼形水合物浆液 (CHS) 的热性能。随后在（42、51 和 64）mm 直径的球形外壳中研究了 0.400 w TBAB 的充电和放电特性。研究了直径和壁温对充电特性的影响，并探索了直径对放电特性的影响。AQS 的所有特性以及 SAQS 的热导率受 w TBAB 变化的影响比受温度变化的影响更大，而 SAQS 的比热则观察到相反的趋势。SAQS 的热导率和 AQS 的比热随着温度的变化表现出最小的变化，而 SAQS 的比热在改变 w TBAB 时表现出最小的变化。SCH的过冷特性对充电性能有显着影响，SCH的过冷度取决于壁温。直径的变化不影响SCH的过冷度。在球形外壳中，SCH 偏心熔化。SCH的充放电速率随着直径的增加而增加。基于此，发现更大直径的胶囊提供更好的充电和放电性能。