基于TRNSYS的双U型地埋管换热影响因素分析

针对水平式埋管占地面积大、换热效果差及竖直式埋管初期投资高、施工难度大的现状,基于TRNSYS建立地源热泵双U型地埋管换热器瞬态仿真模型。在保证研究变量为唯一变量的条件下,通过仿真计算分析地埋管不同钻孔数、不同埋管深度以及不同孔间距对地埋管换热器性能的影响,模拟试验结果表明:增多钻孔数、加深钻孔深度、增大钻孔间距均可提高地埋管换热器的换热效果。本研究为地埋管换热效果与施工难度的平衡提供分析依据。

Analysis of factors affecting heat transfer of double U-shaped buried tubes based on TRNSYS

Because the horizontal buried tubes covered a large area, the heat transfer effect was poor, and the initial investment of the vertical buried tubes was high, the construction was difficult. A transient real-time simulation model of double U-shaped buried tubes heat exchanger was established with TRNSYS software. The factors, which could affect the heat transfer capacity of double U-shaped buried tubes heat exchanger, including the number and the spaceing of holes, and the depth of the buried tubes were analyzed under the condition of unique variable. The simulation experiment results showed that the heat transfer effect of buried tubes could be improved by increasing the number of holes, deepening drilling depth and increasing the spacing of the holes. It provided an analytical basis for the balance between the heat transfer effect of the buried tubes and the construction difficulty.