Research Of Low Airflow Dehumidifier In The Condition Of High Temperature And High Humidity

According to the requirements of the design process, high temperature, high humidity and low airflow conditions cause great difficulties to the process of production. In this thesis, the current refrigeration dehumidification technology is used to design a satisfactory small volume dehumidifier which is applied to the high temperature, humidity environment, and 250m3/h low airflow conditions.Originally, the air-cooling dehumidification scheme is designed. And then, according to the scheme, the refrigeration cycle parameters are designed reasonably under the consideration of the limited factor of low airflow. Finally, the integral design of the dehumidifier is conducted, and the original prototype is made. Subsequently, its dehumidification performance is tested, and the results demonstrate that the designed dehumidifier did not meet the requirements of the dehumidification. Afterwards, the parallel double condensers dehumidifier is designed with water-cooled condenser sharing condensation heat and horizontal compressor selection increasing the cooling capacity. The influences of the refrigerant flow distribution ratio and the inlet air parameters change on dehumidification characteristics are analyzed theoretically. The prototype test results showed that the optimized prototype can achieve the requirements under the condition of low airflow.The working conditions of the evaporator are simulated and the influences of tube diameter, tube row number, refrigerant circuitry and inlet air parameter on heat exchanger were analyzed. On the basis of the system of double condenser dehumidifier, the addition of air-side economizer can increase the dehumidification capacity. Finally, the influences of the connection way of vent import and export and the relative position of the evaporator and vent import on the flow uniformity are analyzed theoretically through analogue simulation.The dehumidifier of high humidity and low airflow is designed and optimized in this thesis. The results showed that the theoretical dehumidification capacity of air-cooling dehumidifier is 27L/D, and double condensers dehumidifier and is 60L/D, double condenser dehumidifier can meet the design requirements, and the dehumidification capacity can be increased by 50% after increase the economizer; The volume of the evaporator designed by 5mm heat exchanger tube is 49% smaller than that of the evaporator designed by 7mm, compared five and two row pipe the dehumidification capacity increased 14%, Compared to original refrigerant, the dehumidification capacity of optimal increased 11%;The longer the transition flow channel of the vent and the greater the relative position of the inlet of the evaporator and the vent, the more uniform the velocity distribution of the inlet of the evaporator, which was more conducive to the dehumidification capacity.