저온 공조용 성층 축열 시스템에서의 열저장특성에 관한 실험적 연구

초록

This paper describes the results of an experimental study. The study focuses on the effects that inlet distributor shapes and inlet flow rate variations have an influence on the stratification in thermal storage tank. A rectangular stainless steel storage tank in discharging process is used. The parameters varied are distributor types and inlet flow rates. Experiments were carried out under the following conditions. The flow rate of working fluid are 20ℓ/min., 10ℓ/min. and 5ℓ/min. In the discharge cycle, the storage tank is initially filled with chilled water of 1℃, and is extracted through the bottom at the same rate as the return warm water from load is entered through the distributor at the top of the tank. After a few minutes, the thermocline forms at the top of the storage tank as the warm water enters the tank from the load through the distributor at the top of the tank. The thermocline thickness increases with time. Emphasis is given to the effects of mixing at the inlet that increases the thermocline decay.