Experimental investigation of a stratified chilled-water thermal storage system
Experimental investigation of a stratified chilled-water thermal storage system
复制标题
DOI：
10.1016/j.applthermaleng.2010.12.019
复制
发表时间：
2011-08
期刊：
影响因子：
--
通讯作者：
A. Karim
中科院分区：
文献类型：
--
作者：
A. Karim
空调在年度高峰电力需求中占很大比例，需要扩建发电厂以满足高峰需求，而这在大多数时间都没有得到利用。使用设计良好的冷蓄热可以在很大程度上抵消高峰需求。在本研究中，设计、建造并测试了一个具有自然分层储水箱的空调系统。设计了一种新型的扩散器，并将其用于本研究。对影响冷冻水储罐性能的因素进行了研究。结果表明，分层储罐在没有任何物理屏障的情况下，分层效果良好。研究还表明，由于增加了温水和冷水的混合，随着流量的增加，存储效率下降。扩散器的设计和布局主要影响入口扩散器附近的混合，这种混合的程度主要影响温跃层的形状。通过罐壁和温跃层的热传导引起混合体积的扩大。分层储罐的热效率高达90%，这表明分层储罐可以有效地用作负荷管理技术。
Air-conditioning forms a large proportion of annual peak electrical demand, requiring expansion of power plants to meet the peak demand, which goes unused most of the time. Use of well-designed cool thermal storage can offset the peak demand to a large extent. In this study, an air-conditioning system with naturally stratified storage tank was designed, constructed and tested. A new type of diffuser was designed and used in this study. Factors that influenced the performance of chilled-water storage tanks were investigated. The results indicated that stratified storage tank consistently stratified well without any physical barrier. Investigation also showed that storage efficiency decreased with increasing flow rate due to increased mixing of warm and chilled water. Diffuser design and layout primarily affected the mixing near the inlet diffuser and the extent of this mixing had primary influence on the shape of the thermocline. The heat conduction through tank walls and through the thermocline caused widening of mixed volume. Thermal efficiency of stratified storage tanks was as high as 90%, which indicates that stratified tanks can effectively be used as a load management technique.