Analysis And Simulations On The Influence Of Underground Water Heat Pump To The Underground Water Temperature And Quality Of Typical Area In Shenyang

As the energy problem getting more globalized and intensive,new clear renewable energy technique attracts wider attention;water heat pump technology can be used as renewable geothermal energy,which has been exploited domestically and abroad.Howerver,as a newly developed technology,Water Heat Pump involves multiple field like energy,hydrology,water resource and mathematics.During the process of operation,the mechanism of the underground water temperature and dynamic field are comparatively complicated,which fails to provide a precise evidence in the application.And there maybe have some problems in the application process,the biggest problem is the "heat transfixion" effect.Once a great degree of "heat transfixion" effect happaned,heat pump system will lose its energy saving and environmental protection significance.Reasonable well spacing and emperature difference of heat exchange are the main measures to avoid the heat transfixion.This paper take permeability coefficient,well spacing,temperature difference and pumping mode as variables,and makes numerical simulations of temperature field in a typical area of Shenyang,studies have shown that:When underground aquifier is composed of comparative smaller geologic structure like medium sand and coarse sand,the spacing of extract well and recharge well should maintain 55m and above.When underground aquifier is composed of geologic structure with comparative largerpermeability quotient,like gravel,the spacing of extract well and recharge well should maintain 105m and above.Temperature difference of heat exchange as 5? is comparatively more stable,safe and reliable than 7?.From the perspective of maintaining high operating efficiency,the best choice is 5? difference.Under the condition that the layout of the buildings can fufil the need of the enlargement of the spacing of the recharge and pump wells,the increase of the spacing and the application of the 7? temperature difference of heat exchange can also help in avoiding the influence of the recharge wells on the extract wells.The cross model of pumping is applied the layout of the recharge and extract wells in the underground water heat pump system,which proves to be lower and weaker than the parallel model.Through the simulation of effects by the typical GWHP systems on groundwater temperature field in Shenyang,can be find that:In a cooling period,intense "heat transfixion"happened around the recharge wells of the GWHP systems.But it did not make a significant impact on water temperature due to the relatively large wells spacing.This paper makes groundwater quality detection of typical area in Shenyang,by chemistry analysis experiment.Research results show that:The rusty of GWHP units makes the Fe2+content increased of the groundwater in the village.Other chemical indicators did not have significant changes in in the operating process under cooling and heating conditions.With the popularization and application of the GWHP systems,immature technical factors and design flaws is completely unmasked as the disorderly market competition.Therefore,the numerical simulation of groundwater temperature field has some guidance to the new underground water source heat pump project.