Study On Heat Carrying Capacity Of Surface Water In Complex Flow Form

With the continuous improvement of people’s requirements for thermal comfort of living environment,the demand for building energy consumption is also increasing day by day.It is extremely urgent to develop renewable energy heating technology.Surface water source heat pump system is widely used in building refrigeration system in summer and heating system in winter because of its energy saving and economy.The existing calculation model of surface water source thermal carrying capacity mainly considers the influence of solar radiation intensity,air temperature and other factors,but the influence of soil heat transfer and external water supply is not considered enough,so that some surface water source heat pumps have poor heating stability in the actual operation of the system.Therefore,comprehensive analysis of potential sources of surface water heat regeneration,especially the impact of water replenishment on surface water heat regeneration,and accurate and quantitative prediction of the thermal carrying capacity of surface water are still important issues to be solved in the development of surface water source heat pump heating technology.Based on the theory of heat and mass transfer,the mechanism of heat transfer between surface water,soil and environment is analyzed in this paper.A calculation model of surface water temperature is established,which takes solar radiation intensity,air temperature,underground soil temperature and water refill as independent variables.Taking The water body of Huamei Lake of Xiangtan University as the research object,the temperature distribution and variation trend of water body under the effect of climate were measured,and the variation rules of environmental parameters and water temperature were analyzed,and the accuracy of the model was verified.In cold climate,the effects of ambient temperature,solar radiation intensity and initial water temperature on water temperature distribution are simulated and analyzed.Solar radiation intensity has the greatest influence on water temperature.When solar radiation intensity is high in sunny days,water temperature changes greatly,and the maximum temperature difference of average water temperature is 0.4 ℃.On cloudy days,the solar radiation intensity is weak and has little influence on the temperature of water body.Under the condition of fixed meteorological parameters in winter,the thermal carrying capacity of water body was simulated with external water refill and cold drainage.Water source heat pump system in winter heating,a long time cloudy or rainy day water temperature continues to decline,water thermal carrying capacity and heating capacity is limited,and appropriate water supplement can effectively prevent the decline of surface water temperature,enhance the thermal carrying capacity of water,improve the energy efficiency of the surface water source heat pump system.