Abstract: A new concept of flow transfixion is suggested by analyzing the general features of aquifer. The interaction between flow transfixion and heat transfixion, and its significance to practical engineering are also analyzed. A couple numerical model of groundwater flow and heat transferring is established based on the basic of water-heat transferring in the aquifer. And then numerical analysis of the flow field and the temperature field for one GSHP in Shenyang City shows that the formation of flow transfixion is hydraulic gradient, namely, it can be judged quantitatively by whether the flow transfixion takes place or not according to hydraulic gradient. When the hydraulic gradient has no notable change, the flow transfixion takes place. Furthermore, the effect of the injecting and pumping rate (Q) to the flow transfixion shows that the shorter of occurrence time of flow transfixion, the more of the value of Q, and it is easier to occur flow transfixion for more of Q, and then to lead to occurrence of heat transfixion. In practical engineering the occurrence of heat transfixion can be reduced by reducing the value of Q, by increasing spacing of injecting and pumping wells, and by rectifying position of the injecting and pumping wells after a work cycle.

Key words: groundwater source heat pump, thermal energy storage of aquifer, enforce convection, flow transfixion, heat transfixion