一种新型模块化吊顶辐射板热工性能研究

发布时间：2018-01-27 16:50

本文关键词： 新型辐射板供冷能力传热模型优化　出处：《湖南大学》2015年硕士论文　论文类型：学位论文

【摘要】：在很多国家,特别是在欧洲,冷辐射吊顶是被普遍应用的一种供冷形式,这种系统通常被用于办公建筑、学校建筑、医院建筑等一些级别较高的建筑当中。研究人员在将这种形式的系统与传统的空调系统进行比较之后发现其具有很多优点,例如:能提供更为卫生的生活环境且舒适性更好、系统运行过程中的噪声更低、安装及检修时更为方便等,这些优点也更符合现代人需求一种更为舒适、健康、节能的空调系统的目标。珠海某公司在原有辐射板的基础上进行了改进,生产出了一种新型辐射板,这种新型辐射板的结构简单、价格不高,并且还能有效解决辐射板凝露的问题,这种新型辐射板的出现使辐射供冷在国内的推广前景更为广阔。但是此类新型辐射板也存在一些设计上的不足,如空气腔的存在造成的供冷能力的减弱。而本文就将通过建立辐射板的传热模型,对此类辐射板结构中的铜管外径、管壁厚度、管间距、辐射发射率和塑料网格支撑,以及辐射板运行时的冷水温度和冷水流速进行分析,找到对辐射板供冷能力影响较大的参数,对辐射板的结构设计进行优化,以达到提高辐射板供冷能力的目的。通过对选定范围内的参数的分析发现:水温、管间距和辐射发射率对辐射板供冷能力的影响最大,塑料支撑高度和管外径对辐射板供冷能力的影响较大,而管壁厚度和冷水流速对辐射板供冷能力几乎没有影响;此类新型辐射板的供冷能力仍有很大的提升潜力,若对辐射板的结构和运行参数进行优化,可以使其供冷能力提高40%~50%左右。同时,本文利用肋片传热的原理,得到了一个适合估算此类辐射板供冷能力的简便计算式,为辐射板的设计提供一个相对便捷的途径,这可以作为设计人员的一个参考。
[Abstract]:In many countries, especially in Europe, cold radiation ceiling is a common form of cooling, this system is usually used in office buildings, school buildings. In some of the higher-grade buildings, such as hospital buildings, researchers have found that this form of systems has many advantages compared with traditional air-conditioning systems. For example: can provide a more hygienic living environment and better comfort, the system operation process noise is lower, installation and maintenance more convenient, these advantages are more in line with the needs of modern people a more comfortable, healthy. The goal of energy-saving air conditioning system. A certain company in Zhuhai has improved on the basis of the original radiation plate, and has produced a new type of radiation plate, which has simple structure and low price. And also can effectively solve the problem of radiation plate condensation, the emergence of this new radiation plate radiation cooling in the domestic promotion prospects more broad, but this new radiation plate also has some design deficiencies. For example, the cooling capacity of the air chamber is weakened because of the existence of the air cavity. In this paper, the external diameter, the thickness of the tube wall and the distance between the tubes in the structure of the radiating plate will be calculated by establishing the heat transfer model of the radiating plate. The radiation emissivity and plastic mesh support, as well as the cold water temperature and velocity of cold water during the operation of the radiating plate are analyzed, and the parameters which have a great influence on the cooling capacity of the radiating plate are found, and the structural design of the radiating plate is optimized. In order to improve the cooling capacity of the radiating plate, it is found that the water temperature, the distance between tubes and the radiation emissivity have the greatest influence on the cooling capacity of the radiating plate through the analysis of the parameters in the selected range. The plastic supporting height and the outer diameter of the pipe have great influence on the cooling capacity of the radiating plate, while the thickness of the pipe wall and the flow rate of cold water have little effect on the cooling capacity of the radiating plate. The cooling capacity of this kind of new radiating plate still has great potentiality. If the structure and operation parameters of the radiating plate are optimized, the cooling capacity of the plate can be increased by about 40%. At the same time, the cooling capacity of the plate can be improved by 50% or so. Based on the principle of fin heat transfer, a convenient formula for estimating the cooling capacity of the radiating plate is obtained, which provides a relatively convenient way for the design of the radiating plate. This can be used as a reference for designers.
【学位授予单位】：湖南大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU83

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