Abstract:For operation safety point of view, the influence of ground water source heat pump(GWSHP)variable flow operation mode on characteristics of aquifer hydraulic parameters was investigated for the office buildings in the typical cities in different climate zones. The variation characteristics of porosity and permeability coefficient of borehole wall were identified by means of numerical simulation method under various operation modes of GWSHP pumping system; consequently the suitability of GWSHP operation mode for climate zone was analyzed. It was presented that the porosity of borehole wall was decreased by 45%, 48% and 44%, the permeability coefficient was reduced by 48%, 51% and 46%, respectively, in cold, severe cold, hot summer and cold winter zones under variable flow operation mode after running for five years compared with constant flow operation mode. After taking the effect of climate zone on characteristics of air conditioning load into account, the GWSHP variable operation mode is most suitable for severe cold zone, more suitable for cold zone, but less suitable for hot summer and cold winter zone.
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