【作者】 马福多；

【导师】 张欢；

【作者基本信息】 天津大学 ， 供热、供燃气、通风及空调工程， 2007， 硕士

【摘要】 传统的空调系统多为冷却除湿,以消耗电能为主,能源消耗量大。本课题研究的金属填料型吸收式除湿器具有以下的优点:吸收剂一般对环境没有危害;运行噪音小、安全可靠;吸收剂的喷淋有效的消除了尘埃、细菌、霉菌等空气中的污染物,提高了室内送风的空气品质;空气减湿幅度大,可以使空气达到较低的含湿量;凭借其良好的环保与节能特性,吸收除湿器具有很好的开发与应用前景。本文的主要工作是进行金属填料型吸收式除湿器除湿性能的研究。通过理论研究与实验研究相结合,研究其除湿性能。实验部分主要是根据实验研究目的,设计并搭建金属填料型吸收式除湿器的测试实验台。实验测试了不同参数条件下除湿器的除湿性能,分析、讨论了空气和溶液的各种进口状态参数(空气流量、温度、含湿量以及溶液流量、温度、浓度)对出口状态参数的影响,并在此基础上对实验数据进行处理,回归得到除湿过程中的对流换热系数的经验公式。理论研究主要是对吸收除湿的原理、气液间的传热传质机理进行研究,依据双膜理论建立金属填料型除湿器传热传质的数学模型,结合实验数据回归得到的对流换热系数的经验公式进行模拟计算。实验结果显示:出口空气含湿量随入口空气含湿量、空气流量和溶液温度的增大而增大,随入口空气温度、溶液浓度和溶液流量的增大而减小;出口空气温度随入口空气温度、含湿量、流量和溶液浓度、温度的增大而增大,随入口溶液流量的增大而减小。将实验测试结果与模拟计算结果相结合,从中可以看出溶液的状态参数对除湿器传热传质的影响较大。在实验的气液流量比(0.4～0.96)范围内,计算得出除湿效率在40%～87%之间。当空气流量1.2kg/m2s,空气温度34.9℃,空气含湿量25.92g/kg干空气,当溶液温度30.4℃,溶液入口浓度20%,溶液流量2.58 kg/m2s时,气液流量比为0.46,除湿效率达到最大值87%;实验过程发现该除湿器运行稳定,具有应用的可行性。另外本文提出的研究方法,获得的数据与性能趋势,以及得出的结论对该课题后续的深入研究将有一定的参考价值。更多还原

【Abstract】 Refrigeration and air conditioning consumes large share of electric energy especially in hot humid areas. In order to overcome the latent load, the air is dehumidified achieved by bring the air temperature below its dew point temperature. The metal pack absorbing typed dehumidifier in this paper has several advantages as following: pollution free liquid desiccants, low operating noise, elimination of pollutants, improvement of air quality in the room, and high dehumidification efficiency. On the basis of its good environmental protection and energy-conserving characteristic, absorbing typed dehumidifier has very strong development and application prospect.Dehumidification performance of the metal packing absorbing typed dehumidifier used in air-conditioning is studied with experimental and numerical method in this paper. Metal packing absorbing typed dehumidifier experimental system is set up and tested. The effects of inlet parameters(air temperature、air humidity、air flow rate and solution temperature、solution concentration、solution flow rate) on the outlet parameters were also investigated. And a great deal of data collected through experiment was processed using multiple linear regression method. Several empirical formulas were given on coefficient of heat transferαC, Coefficient of mass transferαD. Mathematical model of dehumidifier describing heat and mass transfer between air and liquid desiccants is set up based on double-films theory. Taking the heat and mass transfer coefficients achieved from experiments as the input parameter of the model,the temperature distribution of air and water flow on the packing surface was described.It was found that for the fixed dimension, an increase in inlet air humidity ratio, air mass rate and inlet solution temperature results in an increase in air humidity ratio at the exit of dehumidifier. The exit temperature of air also increases with an increase in air mass flow rate, inlet air humidity ratio, inlet air temperature, concentration of solution and inlet solution temperature. However the air exit temperature decreases with an increase in solution mass flow rate. From the experimental result and numerical simulation result, we can draw the conclusion that the inlet parameters of the solution have more influence to heat and mass transfer performance. In the range from 0.4 to 0.96 of air to solution mass flow rate ratio,the dehumidification efficiency calculated is between 40%～87%. At inlet air temperature, humidity and air flow rate of 34.9℃, 25.92g/kgDA and 1.2kg/m2s, and inlet solution temperature, concentration and solution flow rate of 30.4℃, 20% and 2.58 kg/m2s, and air to solution mass flow rate ratio of 0.46, the maximum of dehumidification efficiency reached 87%. The dehumidifier runs steadily within experiment. Consequently, the feasibility efficiency of this dehumidifier can be obtained in application, which will force the subject studying forward. Moreover, the conclusions in this paper will be of some value for the later reference, such as the studying methods, the data, and the changing tendency of performance parameters.更多还原