Inorganic Salt Solution As A Phase Change Material And Its Application In Thermal Storage System

Thermal storage is widely accepted as an important measure for electricity shift from peak period to off-peak period. Inorganic salt solution as PCMs is promising for cool thermal storage use because of it's excellent characteristic. The Supercooling and heat transfer of salt solution in process of phase change were studied.The supercooling relex of inorganic salt solution as phase change materials (PCMs) under vibration condition was experimentally studied. In this work, 10% sodium carbonate solution and 10% ammonium chloride were used as PCMs. The input power was varied from 0 to 20 watts. The cooling curves with and without vibration were measured, while the cooling media temperature was set to -6.7,-7.2 and -18℃. Experimental results indicated that both cooling time and supercooling of PCMs during thermal energy storage process were reduced by vibration. With the increase of vibration power, the supercooling was much more obviously reduced, especially when the power was high. A Supercooling reduction of 2.0℃was achieved with an input vibration power of 20 W.Cool charging characteristics of a spherical enclosure system were experimentally investigated. The well known software ( King-View ) was used to manage the energy of this system. The results showed that the operation was convenient and steady. Also, the complex compute work and strong robustness could be achieved and exhibited in this system. The efficiency of the whole system is about 70%.Mathematical model was used to analysis the economical-technical of the system in this experiment. It was found that the system could reduce cost by optimization control. It would take about 2 years to cover the cost. It is hopeful to apply in the field of some chemical industry.