Analysis of injection for groundwater source heat pump systems

Deduces drawdown equations of groundwater seepage for the system. Analyses the respective injection condition of the system operating with pumping and recharging in different wells and in the same well. The injection pressure increases remarkably with decrease of the horizontal permeability coefficient in homogeneous anisotropy aquifer without clogging. Permeability coefficient is the key point to injection. The contraclogging ability of the pumping and recharging well is greater than that of fully and partially penetrating wells. Clogging remarkably increases the injection pressure. Periodic backwashing is useful in reducing the injection pressure, especially to the system with difficult injection. Whether clogging or not, from point of view of injection, the system with fully penetrating wells should be adopted firstly if the conventional system with pumping and recharging in different wells is applied in the same aquifer.