태양열난방 축열조의 효율향상에 관한 연구

Abstract

This study was conducted to improve efficiency of a heat storage tank for heating equipment with solar collector. Most of solar energy systems are used for water heating application with simple heat storage structures in Korea. However, by the solar energy application is extended to panel heating purposes, there is limitation in efficiency improvement with conventional heat storage tank. It is necessary that the system operates at low temperature condition to increase the efficiency of the system in solar assisted heating equipment. When the conventional heat storage tank used in solar assisted heating system, the water in the storage tank was heated in advance of heating operation by the solar heat, it makes reduction of utilization efficiency in the solar energy. In this study, through analyzing flow characteristics and figuring problems out of a conventional heat storage tank, it is found that the system performance could be improved by optimization of the structure of the storage tank. The experiments are conducted with real scale bases. Therefore, it is possible to note that the experimental results are reflection of actual operating situation. Because of in-situ experiments are time consuming and need lots of expenses, two initial conditions are fixed in this study. As results, solar energy utilization performance of the heat storage tank is improved with vertically installed distributor for return water compare to conventional horizontal type distributor's performance. It is found that the conventional heat storage tank is not suitable for heat storage tank for panel heating equipment and it is possible more improvement by modification of the heat storage tank.