Experimental Study On Technology Of Electricity Thermal Storage

In order to make use of off-peak electricity availably and alleviate the pressure of using electricity in city. This paper presents a technology of off-peak electricity thermal storage in face of the country policy of electric power. The electricity energy is stored in thermal energy during off-peak time and the thermal energy is used to generate hot water for production and life when needed during peak time, which urges the use of off-peak electricity.The subject of the technology of off-peak electricity thermal storage is discussed and investigated: the status in quo of electricity thermal storage studied in the world; the selection of thermal storage medium; the design and manufacture of electricity thermal storage device; the operating and testing of electricity thermal storage device; the analysis of experimental result; the technical and economic comparison between electricity thermal storage and electricity direct calefaction.The experimental results indicate that the electricity thermal device operates steadily and continuously. The systemic thermal efficiency is up to 55%, the FIRR(fmancial internal ratio of return) is 40.8%, which accords with requirement of design. Three salt that is used as thermal storage medium brings phase-change at 143℃ through calefaction, and the electricity is stored as thermal energy for heating water, whose maximum temperature is 100℃. This technology of off-peak electricity thermalstorage is feasible in technology. If the policy of electric power is applied, off-peak electricity thermal storage is compared with electricity direct calefaction, its expense of energy consumption is the lower. It can bring profit. But electricity thermal storage has some problems in some ways and needs further improvements.