Investigation of the Heat Transfer Performance of Multi-Borehole Double-Pipe Heat Exchangers in Medium-Shallow Strata

Just as the double-pipe heat exchanger is being utilized in an increasing number of applications, its research content also deepening. For this paper, based on air-conditioning cold and source project a building Handan, Hebei Province, 300-meter medium-shallow well was used for heating cooling, corresponding transfer model established. The changes parameters such inlet outlet temperature, exchange (with without temperature gradient), borehole wall distribution between single borehole, double boreholes, four boreholes over one year wells were simulated analyzed. By comparing obtained experimental data simulation data, accuracy verified. This provides theoretical basis further advancement lays foundation in-depth study multi-borehole exchangers.