500 MJ급 열에너지 저장 장치의 축열 및 방열 특성

The domestic industrial sector accounts for more than 60% of the nation’s total energy consumption. However, approximately 10% of the energy used in the industrial sector is wasted as unused heat. The utilization of the waste heat can not only improve the energy efficiency in both target and linked processes but also reduce greenhouse gas emissions. In this regard, herein the focus has been placed on thermal energy storage (TES) technologies to store the waste heat and a heat delivery system incorporating mobile-TES. In particular, a 500 MJ-scale TES module based on the latent heat storage of phase change material (PCM) was developed for the application of a heat delivery system. The TES module consisted of 48 PCM units with an internal and external finned tube. Docosanol-a type of organic fatty alcohol-was used as the thermal storage material, and steam and air were used as heat transfer fluids. The results showed that a heat of >700 MJ can be charged at a rate of 160 kW, and a hot air equivalent of approximately 550 MJ could be produced at an 85% thermal efficiency. Each unit could store the heat of 30 MJ and release the heat of 23 MJ.