带有透明蜂窝漂浮式选择性吸热器的小型净水太阳池数值模拟分析

NUMERICAL SIMULATION OF A NEW FRESHWATER FLOATING-COLLECTOR-TYPE SOLAR POND WITH SELECTIVE ABSORBER AND TRANSPARENT HONEYCOMB

提出了一种低热损小型净水太阳池，采用带光谱选择性吸收面的漂浮式吸热器及透明蜂窝结构，可大幅度抑制热损。工作时，从池底抽出的水喷射在吸热器的背面，能使后者恒处于较低的温度。基于一维准稳态假定提出一个计算模型，可用于计算一天中池水温度随深度的变化及一年中各月份的热性能。

A numerical simulation of the thermal performance of a new fresh water solar pond was performed. The special feature of the pond consists in using a floating collector with spectral selective absorber and transparent honeycomb. As a result. the top heat loss of the pond is greatly suppressed. In operation. the water drawn from thebottom of the pond is ejected on the back of the absorber. The result of the forced ejection cooling is that the absorber can be maintained at the lower temperature. Basedon the qusi-steady state supposition a simplified model is tised to calculate the temperature variation with time of the water at the different depth of the pond. The variation of the mean temperature with time of the pond is also predicted and its thermal performance is compared with that of the common pond. The numerical results show that the pressented pond is superior to floating collector-type pond reported in [10] in thermal performance and the tendency of the temperature history is in agreement with that ofexperimentally determined in [10]. The freshwater solar pond described can be used to deliver domestic hot water and it is a suitable low temperature heat source for green house and heat pump for heating.