Experimental Study of Semiclathrate Hydrates Formation TBAOH, TBAF, and TBAC in the Presence of SDS and Tween Surfactants as a Cold Thermal Energy Storage System for Air Conditioning Applications

Over the past decades, the increasing use of air conditioning systems has been one of the main drivers for reducing the peak of electricity consumption. PCMs (phase change materials) for cold thermal energy storage (CTES) allow us to achieve a heat capacity for future use. Hence, CTES has been suggested to reduce power demand problems. In this study, to obtain the phase change temperature and formation temperature of TBAF, TBAC, and TBAOH semiclathrate salts as CTES for air conditioning applications, the experiments were performed from 10 to 50 wt %. Also, the effect of two additives, Tween 80 and SDS, at three weight percentages (0.1, 0.3, and 0.5 wt %) on formation temperature and phase change temperature was investigated. Furthermore, the effects of SDS and Tween mixtures using Design Expert software and Analysis of Variance (ANOVA) were analyzed and optimized. The results showed that, in general, TBAF hydrate solution had a higher phase change temperature . and formation temperature than TBAC and TBAOH salt semiclathrate. The highest phase change temperature for all salts TBAF, TBAC, and TBOAH occurred at approximately 35 wt %, and their temperatures were 24.6 degrees C, 14.1 degrees C, and 12.8 degrees C, respectively. Using SDS and Tween additives, the phase change temperature and hydrate deflection time of TBAC, TBAF, and TBAOH were 21.73 degrees C, 26.08 degrees C, and 28.84 degrees C and 32.31 min, 25.92 min, and 20.20 min, respectively. With the Design Expert software, a model for the phase change temperature and deflection time of each hydrate was obtained. In the optimization section, a condition of the optimal hydrate formation was proposed.

Automated summary

In this study, experiments were conducted to determine the phase change temperature and formation temperature of TBAF, TBAC, and TBAOH semiclathrate salts as cold thermal energy storage for air conditioning applications, as well as the effect of Tween 80 and SDS additives. The results showed that TBAF had the highest phase change temperature and formation temperature compared to TBAC and TBAOH.