地源热泵型地下连续墙内埋管换热器优化设计

Optimization Design of Geothermal Heat Exchangers in Diaphragm Walls

摘要:

地下连续墙内埋管技术是地源热泵技术的一个新的发展方向，国内外对其在设计计算方法方面的研究并不多见。根据地下连续墙内埋管换热器传热模型及埋管内流体温度场提出了地下连续墙内埋管换热器换热能力和出水温度的计算方法，并基于正交分析给出了上部建筑负荷最大时地下换热器的换热量及出水温度最高值的回归公式。在此基础上，根据出水温度最高值、单组埋管长度以及地下连续墙单幅宽度等限制条件提出了地下连续墙内埋管换热器的优化设计方法，并以上海自然博物馆地下连续墙内埋管为例进行了计算。分析表明，该优化设计方法计算简便，容易为工程设计人员所接受。

Abstract:

To bury absorber tubes in diaphragm wall as heat exchanger is a new developing direction of ground source heat pump technology. However, the researches on the design method of heat exchangers embedded in diaphragm walls are so far relatively rare. According to the heat transfer models of heat exchangers in diaphragm walls and the flowing temperature field inside heat exchangers, a calculation method of variable heat exchange capacity of heat exchangers in diaphragm walls and temperature of outlet water was proposed. The regression equations of the heat exchange rate and the highest temperature of outlet water while cooling load of overground building reaches maximum were obtained based on orthogonal analysis. On these bases, an optimization design method of heat exchangers in diaphragm walls was presented, which may be used to get the optimum parameters of heat exchangers according to the limits of highest temperature of outlet water, length of a set of heat exchangers, as well as the width of a breadth of diaphragm wall. The optimization method was also applied to optimize the heat exchangers in diaphragm walls of Shanghai Museum of Natural History. The analyzed results indicate that the proposed optimization method is simple, and easy to use by designers.