Study on the influencing factors of the coupled thermal — Hydrologic flow processes in water source heat pump

A numerical model of the coupled thermal — hydrologic in production and injection of multi-wells of water source heat pump was built by TOUGH software. We analyzed some influencing factors of bringing out thermal breakthrough, which include pumping flux, the distance between multi-wells, the osmosis ratio and groundwater flow velocity on the numerical experiments. The temperature of aquifer relative equations were given on multi-wells system in production and injection of water source heat pump: The pumping and injecting flux VS the temperature of aquifer (y=−0.188x+12.46); the distance between wells VS the temperature of aquifer (y=−0.001×2+0.196x+3.792); the osmosis ratio VS the temperature of aquifer (y=−0.143x+11.59). The thermal breakthrough happens among the key value of geological factors on the model: the maximum groundwater flux is 2014m³/d; the distance should be more than 49m. This paper will supply theoretical basis and references for engineering design of multi-well system in production and injection of water source heat pump.