| Under the background of energy consumption and environmental pollution,groundwater source pumping with its clean non-polluted and renewable ad-vantage, the various countries positive quickly promotion and the use of a largearea of new energy. During water source heat pump system development, the firstto solve ishow to improve groundwater source heat pump system operating effi-ciency. Influence factors of heat pump efficiency have hydrogeological cond i-tions and the system running scheme. Based on the Lixin County People’s Hos-pital of water source heat pump system design, groundwater seepage and heatmigration couppled model is built. It is calculated by the HST3D heat transfersoftware developed by the U.S. Geological Survey. finally,water source heatpump system efficient operation of the influence factors are studied. The conclu-sions are as follows:(1) The sphere of influence of the flow field is much larger than it of thetemperature field when groundwater source heat pump system run in well mode.Under strong pumping and recharge conditions, groundwater temperaturechanged primarily by heat convection. If there is not heat breakt hrough, let theflow fields near of the pumping wells and recharge wells influence each other,which can avoid level drawdown or rise too much to keep the capacity of pum p-ing or recharge;(2) Recharge amount has a significant effect on the groundwater flo w fieldand temperature. When recharge was to90%the heat transfixion time would de-lay, but the level near of the pumping wells would increase and the flow fieldrecover slowly. Therefore, the recharge must be according to the pumping capa c-ity of100%, to prevent the long-running system formed secondary geologicaldisasters, in view of the well group arranged around the building;(3) Comparison of analysis and simulation, the well spacing and well grouplayout program exert a tremendous influence on flow fields of the groundwater.As pumping wells and recharge wells keep the relative position, with the wellspacing of them increased from25to60meters, the flow field and temperaturerange to expand and the heat transfixion time extended.interval of the flow fieldand the temperature field recover more slowly with the well spacing increased.Considering the actual engineering building layout and limit of regional the loc a- tion, the well spacing should not take over50meters;(4)Which the choice of system initial operation period affected the under-ground temperature field was different because of the difference of the summerwater temperature (14℃) and winter water temperature (12℃).The water fromthe summer to recharge is high initial period.The end of run ning in a completeaquifer area The underground temperature is higher than the initial temperature of1.5, it is difficult to restore to the initial temperature. From heating in winter, thecold water of recharge could be used for summer cooling water. Th e temperatureof study area is lower than the initial temperature of0.5℃at the end of the sys-tem running, and closing to the initial state.(5) Aquifer accumulated energy, in long-running process of water sourceheat pump system. From the actual working conditions the cumulative effect ofcomparative analysis, the initial heating began in winter, because the cold of thewinter accumulation is easy to use in summer months, and the accumulated heatin summer was used in winter. The temperature field was slightly higher thanthe initial temperature in the end of the study area. Therefore, for the reasonableuse of cold or heat stored in the aquifer and saving energy, pumping wells andrecharge wells were used. |
PDF Full Text Request