Research On Overall Design And Key Technology Of Temperature And Humidity Regulator Based On Thermoelectric Refrigeration

The temperature and humidity of air are closely related to human daily production and life.Under the national "green development" environmental protection concept,the problems of traditional dehumidification technology such as high noise,serious pollution,and difficulty in carrying have become more and more obvious,which makes the energy saving and environmental protection requirements of various industries for dehumidification technology higher and higher.Thermoelectric refrigeration technology is widely used in aerospace,medical,electric power,military and other industries due to its advantages of no refrigerant,environmental friendliness,stable operation and no noise.In order to avoid the damage of the humid air in the electrical cabinet to the electrical components and ensure its normal and stable operation.Aiming at the problem of low condensing and dehumidifying capacity of the dehumidifier,this paper optimizes the cold end structure and develops a thermoelectric refrigerated temperature and humidity regulator..Comprehensively analyze the working process of the temperature and humidity regulator,and analyze and study the cold end dehumidification structure of its key parts.Key aspects of the condensation heat transfer between the rectangular fin heat exchanger and wet air in-depth study,which provides a theoretical basis for the subsequent design and development of the temperature and humidity regulator.1.Based on the theory of thermoelectric refrigeration and humid air condensation and dehumidification,set of heat transfer analysis model of thermoelectric refrigeration temperature and humidity adjustment device suitable for electrical cabinets was established,and a mathematical model of heat transfer between the internal humid air and the condensing end,the environment and the heat dissipation end of the temperature and humidity regulator were constructed;2.The system composition of the thermoelectric refrigeration temperature and humidity regulator was designed and analyzed,mainly include: determining the overall working principle of the temperature and humidity regulator,selection of the type and quantity of semiconductor refrigeration fins,the material and size design of the condensing end fins,the composition of the control system was selected,and the heat dissipation form of the hot end was analyzed and determined;3.The experimental platform for thermoelectric refrigeration temperature and humidity adjustment was built to study on the inlet wind speed of the cold end of the dehumidifier.The four sets of experiments date were analyzed,analyze changes in temperature,wind speed,and relative humidity at the cold end of the humid air over time,therefore,determine the best inlet wind speed of the temperature and humidity regulator;In addition,the humid air internal and external circulation experiment was carried out on the designed temperature and humidity regulator,which showed that different airflow organization forms adapt to the dehumidification needs of different occasions;4.Humid air condensation process simulation,using CFD simulation software,the simulation data was compared with the data measured on the experimental platform to verify the accuracy of the simulation results;Focus on the design of the length,thickness and spacing of the condensing fins,Investigate the influence of rectangular fin structure size on overall dehumidification performance,and based on the orthogonal experiment design,the sensitivity analysis of the size parameters was carried out,and it is found that the optimal combination is L=420mm,l=5.4mm,d=1.2mm;At the same time,the influence of the wet air inlet wind speed and the cold end temperature of the cooling fin on the overall dehumidification performance of the temperature and humidity regulator was analyzed.The fin structure and environmental parameters that were more conducive to the condensation of humid air were obtained,and found that both have the best value,which can effectively improve the heat exchange efficiency between the humid air and the cold end fins.