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个人信息 |
学号 | 0228305 |
姓名 | 张广丽 |
学院 | 城市建设与环境工程学院 |
专业 | 供热、供燃气、通风及空调工程 |
申请学位 | 硕士 |
指导教师 | 王瑾(副教授); |
论文信息 |
论文标题 | 液体去湿空调中除湿器性能研究 |
Title | 无信息 |
关键词 | 液体除湿剂 液体去湿 填料塔 实验研究 模拟计算 多元回归分析 |
Keyword | liquid desiccant, liquid dehumidification, packing tower, experimental study, esimulation numeration, multiple regression |
完成时间 | 2005年1月 |
中图号 | TU8 |
摘要 | 液体去湿空调系统是一种环保节能的新型空调方式,目前尚处于实验研究阶段。液体去湿空调系统适合以太阳能、工业余热等低品位热源作为再生热源,因此,从保护环境和节约能源角度来看,具有较大的节能潜力和环保效应,发展前景看好。除湿器是液体去湿空调系统中的核心部件,本文主要针对该系统中的除湿器进行研究。
本文选用填料吸收塔作为系统实验台的除湿器, LiCl作为除湿剂,搭建了液体去湿空调系统实验台,并从理论和实验两方面对填料塔除湿器进行了研究。
基于除湿器除湿过程中的热质平衡建立了填料塔除湿器的热质交换数学模型,确定出除湿器的合适高度以及适用于该除湿器的各项气液参数范围,同时,运用理论模型模拟了除湿器进口各项气液参数(包括:溶液流量、风速、空气干球温度、空气绝对含湿量、溶液温度、溶液浓度)对出口各项气液参数(包括:空气干球温度、空气绝对含湿量、溶液温度、溶液浓度)的影响。根据模拟计算结果,对除湿器除湿过程进行实验研究,研究结果表明模型计算值和实验结果有很好的一致性,既验证了模型中所引入参数取值的有效性,同时也反映出除湿过程中各个进口参数对出口参数的影响规律。最后,对实验数据进行多元回归分析,得出三个出口参数(空气干球温度、空气绝对含湿量、溶液温度)受六个进口参数影响的实验关联式。利用该实验关联式,能够很好地预测除湿过程中的出口参数。
本文所得出的实验数据和参数的变化规律将为液体去湿空调系统的进一步深入研究提供依据,具有一定的实际指导意义。 |
Abstract | The liquid-desiccant air-conditioning system is a kind of new air conditioning style and hasn’t been applied in practice, which is useful for protecting environment and saving energy. The low-grade heat such as that provided by solar energy collectors or waste heat stream is suitable for the regeneration of liquid desiccant in the liquid-desiccant air-conditioning. Therefore, the new style is more preferable than compression air conditioning system on protecting environment and saving energy. Dehumidification equipment is the core of the liquid-desiccant air-conditioning system, so the study in the paper aims at the dehumidification equipment.
The experimental equipment of liquid-desiccant air-conditioning was designed and built up, in which the packing tower absorber and LiCl solution was chose as the dehumidification equipment, and liquid desiccant respectively. The packing tower dehumidification equipment was studied theoretically and experimentally.
The theoretical model of heat and mass transfer between air and solution on the fill surface was established on the basis of energy and mass conservation on the differential element. After the proper height of the packing tower and the range of every parameter both air and solution determined, the effects of inlet parameter (solution flow rate, wind velocity, air temperature, air humidity, solution temperature,solution concentration) on the outlet parameter (air temperature, air humidity, solution temperature, solution concentration) were provided by theoretical model. The experimental study of the dehumidification was carried out based on the simulation numeration. The results show the simulation numerical values and experimental numerical values are coincident. It not only indicates the theoretical model is effective, but also reflects the rules that the effects of inlet parameters on the outlet parameters in the process of dehumidification. In the end, A Statistical Analysis Software regression is performed on experimental data. The three regression relation model for the outlet three parameters (air temperature, air humidity, solution temperature) affected by the inlet six parameters are determined. The three regression relation can be used for the reliable forecast of outlet parameters in the process of dehumidification.
These experimental data and rules of every parameter in the paper are useful to the farther study of the liquid-desiccant air-conditioning system. It will provide the theoretical foundation and reference for the liquid-desiccant air-conditioning system. |
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