单U、双U型埋管换热器换热性能与经济性研究

结合实际工程建立单U型与双U型埋管换热器实验系统,进行夏季排热和冬季取热实验。以单位井深换热量为评价指标对不同埋管方式的换热性能进行分析比较,得出排热和取热工况下,双U型埋管单位井深换热量均高于单U型。同时,分析了单U与双U型埋管换热器的经济成本构成,采用投资成本指标、静态投资成本差值和投资成本比数等参数,从换热性能和经济成本两方面对地下埋管换热器进行综合评价。

HEAT PERFORMANCE RESEARCH AND ECONOMICAL ANALYSIS OF SINGLE U SHAPED AND DOUBLE U SHAPED VERTICAL BOREHOLE HEAT EXCHANGER

According to the practical project,the experimental system on single U shaped and double U shaped vertical borehole heat exchanger was established.Heat release experiment in summer and heat extraction experiment in winter were carried out.And analysis and comparison between two kinds of heat exchangers were implemented with the evaluation standard of heat exchange quantity per well depth.The result shows that the heat exchange quantity of double U shaped is more than that of single U shaped under heating and cooling conditions.At the same time,the cost composing on of two kinds of underground heat exchangers was analyzed.Economical analysis were evaluation were carried out by using some economical parameter such as index,static value difference and ration of investment cost.It is reasonable that synthesis analysis and evaluation of both heat performance and investment cost were used to borehole heat exchanger.