Experimental Study on Heat Transfer Characteristics of Casing Type Buried Tube Heat Exchanger under Heat Storage/Extraction Condition
In order to study the unsteady heat transfer characteristics of the vertical casing buried pipe,an experimental study on the vertical casing buried pipe was carried out by building the sand box test bench for heat transfer characteristics of the vertical casing buried pipe,the analysis of the working condition of heat storage and heat removal conditions different operation mode on the vertical pipe ground tube and the influence of the soil around heat transfer characteristics,the variation rules of inlet and outlet water temperature,surrounding soil temperature the average quantity of heat pet meter and the average heat transfer coefficient were obtained.The experimental results show that the smaller the start-stop ratio,the larger the fluctuation range of soil temperature around the buried pipe when the intermittent operation mode is 1∶1 and 1∶2 under heat storage condition.In the process of heat extraction,the soil temperature with the distance from the diameter of the buried pipe is less affected by the start-stop ratio time.The average quantity of heat pet meter in intermittent operation mode is higher than that in continuous operation mode.When running for 72 h,the average quantity of heat pet meter under start-stop ratio 1∶1 mode is 157.98 W/m higher than that under continuous mode.It is concluded that intermittent operation mode is beneficial to soil restoration,so the intermittent operation can be reasonably selected according to the building requirements in practical engineering.
casing type buried tubeexperimental studystart-stop ratioheat storage/extraction condition
万方数据
维普
