Experimental Investigation On Separate Gravity Heat Pipe With Microchannel Heat Exchangers

Recently,new energy and information industry of China have been highly developed.With the gradual improvement of information technology and new energy technology,the electronic components used in base stations and substation cabinets tend to be centralized and high-powered.Cooling equipment in the cabinet not only faces the technical problems brought by these trends,but also takes into account the requirements for energy utilization and environmental protection.In order to meet the dissipation requirements of cabinet,this paper chooses microchannel separate heat pipe with high heat transfer efficiency,high energy efficiency and well compact structure as research object.In this paper,a microchannel separate heat pipe heat cooling system with heat cooling power of 0~2kW and heat transfer temperature difference of 5~20K is selected.The variation of heat transfer performance under different height difference,filling ratio,temperature difference,wind speed is studied.The following research is carried out: Design of experimental scheme,matching calculation of micro channel heat exchanger,assembly of the experimental bench and the experimental research.The results show that:(1)The optimum filling ratio of heat pipe with microchannel heat exchangers in the experiment is about 100%,and the optimum filling ratio doesn't change with the height difference.(2)The heat transfer performance of the system increases with the height difference,but the increment of the heat transfer performance decreases with the increase of the height difference.The effect of the height difference on the heat transfer performance at a small temperature difference is more Significant.(3)As the temperature difference between indoor and outdoor increases,the heat exchange performance of the system will also be improved.However,when the temperature difference reaches a certain value,the influence on the heat exchange performance of the system will reduce.(4)With the increase of wind speed,the heat exchange performance of the heat exchanger increases obviously.(5)The height difference has a positive impact on shortening the start-up time of the system.