Study On Performance And Ice Strength Of Extracting Solidification Heat Exchanger

At present,China's building heating is still dominated by coal combustion.The development and utilization of low-grade renewable clean energy has broad prospects and is an inevitable requirement for the sustainable development of energy,construction and environment.The heat pump system has a series of advantages such as high efficiency,energy saving and significant environmental benefits,but various heat source problems limit the application of the heat pump system.In the current water source heat pump system,the sensible heat in the environmental water source is extracted,and the large amount of latent heat released by the water in the solidification is neglected.This paper proposes a new type of extraction and solidification heat exchange device and its system.The form,the structure of the heat exchanger,the performance of the heat exchanger,and the ice strength after icing have been studied in depth.Firstly,by designing the form of the extraction solidification heat pump system,the heat exchange method of the water-contained heat exchange barrel is used to rotate and scrape the ice.This heat exchange method is carried out on the surface of the heat exchange barrel,and is not a full liquid heat exchange,which can be very It is good to avoid the formation of ice in the heat exchange tube too quickly,causing the blockage in the heat exchange tube to make full use of buoyancy and centripetal force during the system shutdown.Under the condition of controlling the flow rate of the water injection pipe,the ice discharge problem is well solved.Secondly,after theoretical calculation,the selection and design work of the solidification heat pump system and the solidification heat exchange device structure are drawn,and the system flow chart,the principle diagram of the solidification heat exchange device,and the dimensional diagram of the solidification heat exchange device are drawnThen,the performance test of the designed solidification heat transfer device was carried out,and the improvement experiment was carried out for the problem of ice scraping and the low energy efficiency ratio of the system.The experiments carried out were the performance tests of the ice brush type solidification heat exchange device,the ice knife type solidification heat exchange device and the water cooled flake ice machine,and recorded the experimental data,the ice scraping effect of the three solidification heat exchange devices and three kinds of exchanges.The system energy efficiency ratio of the thermal device is compared,and the best heat exchange device with the best energy-saving ratio among the three ice-scraping devices is obtained.Finally,in order to improve the system COP,the ANSYS software is used to simulate the icing process of the solidification heat transfer device,and the temperature field distribution cloud map is obtained.By changing the refrigerant inlet temperature,the temperature change curve of the temperature measurement point is drawn.According to the relationship between ice strength and ice temperature,the optimal refrigerant inlet temperature was obtained,and the ice strength test after icing of different concentrations of brine was carried out to obtain the lowest intensity brine ice.