Operation optimization on middle-deep U-type buried pipe ground source heat pump systems
The analytical model for middle-deep U-type buried pipe heat exchangers is established.An operation optimization model is presented for middle-deep U-type buried pipe ground source heat pump systems,which comprehensively considers the dynamic heating loads of buildings and the dynamic heat transfer process of buried pipe heat ex-changer.Using this model,the influence of operation parameters on the performance of ground source heat pump system is analyzed.The results show that under the premise of the same heating capacity of system,compared with the constant-flow-rate(110 m3/h)op-eration mode,the variable-flow-rate operation mode reduces the total power consumption of the heat pump unit and water pump by 22.1％from 288 423 kW·h to 224 592 kW·h during 2 112 hours of operation.As the thermal conductivity of backfill material increases,the frequency of heating shortage decreases,and the ratio of heating supply(RHS)increa-ses.When the vertical pipe length increases from 2 300 m to 2 500 m,the average RHS of system increases from 95.7％to 98.8％,and the average COP of the heat pump unit in-creases from 4.929 to 5.135.With the increase of heating load of the building,the COP of the heat pump unit decreases linearly,while the total power consumption increases.
ground source heat pumpburied pipe heat exchangervariable flow ratecoefficient of performance(COP)analytical model
万方数据
维普
