Design And Performance Study Of Small Semiconductor Cooling Dehumidifier

With the rapid development of China's economy,people have higher and higher requirements on environmental humidity in production and life,so dehumidification technology is of great importance.In many dehumidification technologies,cooling dehumidification technology is the most widely used,applicable to machinery,medicine,agriculture and other places that need dehumidification,but the refrigerant used by traditional cooling dehumidifier has caused great damage to the environment,which runs counter to the concept of "green development".Semiconductor refrigeration technology has developed rapidly in many fields,such as agriculture,medical treatment,military,etc.Therefore,this paper designs and develops a semiconductor dehumidification device,which has the advantages of no pollution,no noise,few components,light and movable,and is suitable for dehumidification in small space such as storage room,display cabinet,bookcase and medicine storage room.The research and development of the dehumidifier can promote the development of small semiconductor dehumidifier.Firstly,the operating conditions of semiconductor refrigeration technology and the influencing factors of cooling and dehumidification technology are studied.Based on the principle of semiconductor refrigeration,four operating conditions of semiconductor are studied,including general operating conditions,optimal operating conditions,maximum refrigerating coefficient operating conditions and maximum refrigerating capacity operating conditions;on the basis of cooling dehumidification principle,several factors affecting dehumidification efficiency are analyzed.Secondly,the cooling system of semiconductor dehumidifier is theoretically calculated and preliminarily designed.It mainly includes the following contents:calculation of space heat load;determine the type,quantity and connection mode of refrigerating sheet;the design of cold end fin and the selection of hot end heat dissipation method are carried out.When designing cold end fins,the corrugated fin was innovatively introduced into the condensing end of the semiconductor dehumidifier instead of the traditional flat fin,which increased the disturbance to the air and effectively improved the heat transfer efficiency between the air and the fin.Thirdly,the experiment platform of semiconductor dehumidifier was built to study the optimum working current value of dehumidifier.The 24 groups of data under six experimental conditions were analyzed,the data were plotted into the curve of the temperature at the cold and hot ends of the refrigerating sheet and the humidity over time,and the curve of dehumidification capacity and dehumidification amount per unit input power with the input current value.Thus,the optimal operating current value of the semiconductor dehumidifier is determined.Fourthly,in order to improve the dehumidification efficiency,an improved design scheme of adding a double-pipe heat exchanger to the semiconductor dehumidifier was proposed for the first time in this paper,and complete the heat transfer calculation;accordingly,the dehumidification experiment table was improved,and the optimal current experiment of the improved dehumidifier was carried out to determine the optimal operating current value of the improved dehumidifier.The 48 groups of experimental data of the optimal current experiment of the dehumidifier before and after the improvement were compared and analyzed,the results show that the dehumidification efficiency of the improved dehumidifier has been improved significantly.Finally,in order to further explore the influence of six environmental relative humidity values on dehumidification efficiency,the performance of the improved semiconductor dehumidifier was experimentally studied.The data of humidity changing with time in 6 groups of boxes measured and the data of 12 groups of dehumidification capacity and dehumidification amount per unit input power changing with environmental relative humidity were plotted and analyzed.The law of dehumidification efficiency changing with relative humidity and the scope of application of environmental humidity of the improved semiconductor dehumidifier is put forward.It has important reference significance to the study of dehumidification efficiency of semiconductor dehumidifier in the future.