Study On The Heat Exchange Efficiency Analysis And Experimental Method Of Fresh Air System

With the development of times and social progress,the gradual increase in the level of per capita income,people’s living environment of the quality requirements are getting higher and higher.In the summer and winter,people want to have a more comfortable learning,work,living environment.In recent years,the fog haze weather makes people pay more attention to the requirement of indoor air quality.At the same time,the rapid development of the economy are rely on the rational use of resources,energy conservation and environmental protection and so on,so the state advocates energy conservation and emissions reduction.There is a contradiction between saving energy and investing resources to improve air quality.Fresh air system is one of the ideal equipment to solve this contradiction,with good and broad prospects.At present,the heat recovery rate of the fresh air system is not high,which is a major problem of this equipment,improving heat exchange efficiency of the equipment is the main purpose of this paper.In this paper,several common fresh air systems on the market are studied in detail from the internal flow path structure of the heat exchange core to the core material and a more in-depth to the fresh air system machine.The main work and conclusions are as follows:(1)In this paper,the simulation method is combined with the experiment to study the effect of the secondary heat transfer on the heat exchange efficiency of the heat exchanger core material,the internal flow channel structure of the heat exchange core and the support of the heat conducting fins.The experimental results and simulation reports show that the performance of the triangular channel structure is optimal for a wide range of flow path structures for cross-flow heat exchange cores and heat conduction of fins on the heat exchange efficiency of the heat exchanger core has obvious help,chosing cost-effective heat exchange core material helps to improve the heat exchange efficiency of fresh air systems.(2)The heat exchange core and the fresh air system are regarded as a whole.The finite element simulation is carried out to study the effect of the air flow on the heat exchange efficiency before entering the heat exchange core.During the operation of the fresh air system,Due to the rapid wind speed and the irrational structure of the fresh air system,the utilization efficiency of the heat exchange core is reduced,which affects the heat exchange efficiency.Therefore,it is shown that fresh air system structural design optimization and period of the structure of the heat exchanger core body connected entry has a great influence on the heat exchange efficiency of the fresh air system.(3)According to the previous large number of simulation analysis,the improvement of the structure of the fresh air system is put forward,and a new fresh air system structure is designed.It is designed to integrate the air purification and filtration function into the fresh air system to meet the people’s demand for air quality,The results show that this new type of fresh air system can effectively improve the heat transfer efficiency.In this paper,some new ideas are put forward for the research of fresh air system,which provides a theoretical reference for its optimal design and has important guiding significance for the further development of fresh air system.