【作者】 吴东兴；

【导师】 金苏敏； 樊高定；

【作者基本信息】 南京工业大学 ， 热能工程， 2004， 硕士

【摘要】 随着人民生活水平的不断提高以及全球能源危机的日益加剧,人们对居住环境,尤其是室内空气环境提出了越来越高的要求,同时也对空调设备的节能高效也提出了严格的要求,这很大程度上促进了制冷空调新技术的发展,也顺应产生了以高效节能、环保舒适著称的多联式空调(热泵)机组(MACU)。本课题的主要任务就是进一步优化提高MACU 的运行性能和节能效果。本文首先介绍、总结、消化已有的关于MACU 的研究成果。主要做了以下几方面的工作:1. 详细对比分析了目前MACU 系统的常用的对电子膨胀阀和压缩机的控制方法,各自的优缺点,提出了“电子膨胀阀——压缩机的同步控制法”,它对于削弱系统运行中的振荡问题,提高系统运行稳定性有一定效果。2. 针对同步控制方案,设计了电子膨胀阀的模糊控制器和变频压缩机的精准在线控制,其中,与一般的模糊控制器不同的是,在模糊控制输入变量的引入上作了新的尝试,并且,为了克服一些弊端,引入了变步长、变采样时间、变目标温度的“三变”设计思想,并设计了特别的运行模式;在对电子膨胀阀的特性及制冷系统的运行规律的认真分析基础之上,设计了变频压缩机的精准在线控制。3. 为了验证改进的效果,文章提出试验的测试内容,根据课题的研制目的、试验要求特别设计了一套关于系统运行状况的测试系统,为接下来的实验作了较为充分的准备。文章最后,提出了几点关于MACU 的未来研究设想。更多还原

【Abstract】 With the improvement of the people’s living conditioning and the aggravation of globe energy crisis day and night, the public’s requirement is higher and higher to resident environment, especially to indoors air quality. At the same time, stricter standard on high efficiency and economical of air conditioning facility have been drafted. All of those accelerated the progress of new refrigeration and air conditioning technology, with the birth of Multi-connected Air-condition (heat pump) Unit (MACU), which is famous on high efficiency, economy, and comfort. The main object of this subject is to improve operating performance and high efficiency continually. At the beginning of this paper, it introduces and summarizes the existed research results. The major work about this paper includes three parts. Firstly, it analyzes the control methods, which are common on electronic expansion valve (EEV) and inverter compressor. Basing on the advantages and disadvantages of each control methods, it brings forward a new control method: electronic expansion valve—compressor synchronous control, which is effective on improving system’s running stability and weakening fluctuation. Secondly, according to synchronous control method, it designs fuzzy controller of EEV and precise online control of inverter compressor. Additional, it differs from general fuzzy controller, which tries the new way on input parameters of fuzzy controller and introduces variable step, variable sampling time, and variable object temperature thoughts. The running mode is also particular. Basing on analyzing the characteristic of EEV and running rule of refrigerating system in detail, it designs precise online control of inverter compressor. Thirdly, it lists the testing items. Particularly, it designs a new testing system, which can inspect the running state of the system, according to the objects and requirements of the subject. Those will provide for the following experiment adequately. At the last of this paper, the author conceives several requirements about future research of MACU.更多还原