储热水箱分层性能指标的研究进展

Research Status on Stratification Performance indices of Hot Water Storage Tanks

许多研究者分别提出了不同的表征储热水箱分层性能的指标,本文对这些指标进行了归类和综述,较详细地解释了出水效率、?效率、混合数、取出效率、斜温层厚度、理查森数、高径比、分层数等指标的定义、计算方法及各自的特点。出水效率越高、取出效率越高、理查森数越大、混合数越小、斜温层厚度越小,水箱分层效果越好;高径比介于3-4对于水箱分层是比较合理的值。本文为选用合适参数对水箱性能进行研究提供了参考和借鉴。

Different kinds of indices to characterize the stratification performance in hot water storage tanks are raised by a lot of researchers. The classification and review of these indices were discussed. The definitions, calculation methods and each characteristic of discharge efficiency, exergy efficiency, MIX number, extraction efficiency, thermocline thickness, Richardson number, height to diameter ratio and stratification number were explained in detail. The higher discharge efficiency, extraction efficiency and Richardson number and the lower MIX number and thermocline thickness will results in the better effect of stratification; it is reasonable that the height to diameter ratio is within 3-4. The research results will give a reference for choosing a suitable index to characterize the water storage tanks.