变频多联式空调系统适用性及管路阻力特性研究

发布时间：2018-11-19 11:10

【摘要】：近年来,雾霾天气以及极端恶劣天气的频繁出现,使得人们愈来愈重视环境问题和能源问题。随着社会经济的发展和人们生活水平的提高,我国能源消费总量逐年提高,占我国能源消费总量三分之一的建筑能耗也在逐年提高,建筑能耗的一半来自空气调节、采暖通风及相关系统。因此,空调系统节能不仅可以降低系统的运行成本,还可以降低建筑能耗。变频多联式空调系统因其舒适、节能、运行成本低、维护简单等特点,近年来在学校、医院等中小型建筑中得到广泛的应用。因此,关于变频多联式空调系统在高校综合办公楼中的适用性研究、系统部分负荷下运行时管路的阻力特性、以及系统管路的优化设计研究将对这一空调系统的工程应用具有重要的指导意义。本文从变频多联式空调系统负荷特性及其技术经济性两方面对这一系统的适用性进行研究。首先运用DeST软件对西安地区一高校综合办公楼进行能耗模拟,并对采暖季、制冷季的负荷进行了统计分析。其次,以该办公楼内安装的一个变频多联式空调系统为研究对象,研究了系统不同负荷率下的负荷特性;并对四种不同空调系统方案(变频多联式空调系统、地下水源热泵空调系统、空气源热泵空调系统、分体式房间空调器系统)进行了经济性分析比较。此外,通过分析该办公楼变频多联式空调系统的实验测试结果,验证该类型建筑使用变频多联式空调系统的适用性。通过以上几方面的研究,得出该办公楼使用变频多联式空调系统是使用的。本文还理论研究了变频多联式空调系统不同负荷率下的管路阻力,得到了变频多联式空调系统管路阻力特性及其影响因素,提出减小系统管路压降的方法。变频多联式空调系统设计时,应尽可能使设计的一个系统室内机在都同一个楼层,并选取较短的立管和合适的管径。最后,按照变频多联式空调系统的管路阻力特性,对一既有系统进行优化设计。本文的研究对深入了解高校综合办公楼空调能耗特性、变频多联机空调管路阻力特性和变频多联式空调系统的工程设计有积极的作用。
[Abstract]:In recent years, people pay more and more attention to environmental and energy problems due to the frequent appearance of haze weather and extreme severe weather. With the development of social economy and the improvement of people's living standard, the total energy consumption in China is increasing year by year, and the building energy consumption, which accounts for 1/3 of the total energy consumption in our country, is also increasing year by year. Half of the building energy consumption comes from air conditioning. Heating, ventilation and related systems. Therefore, air conditioning system energy saving can not only reduce the operating cost of the system, but also reduce the building energy consumption. Because of its comfort, energy saving, low operating cost and simple maintenance, frequency conversion multiplex air conditioning system has been widely used in small and medium-sized buildings such as schools and hospitals in recent years. Therefore, the applicability of the variable-frequency multi-connected air conditioning system in the comprehensive office building of colleges and universities is studied, and the resistance characteristics of the pipeline running under partial load of the system are also discussed. The research on the optimal design of the system pipeline will be of great significance to the engineering application of this air-conditioning system. In this paper, the applicability of this system is studied from two aspects: load characteristic and technical economy of frequency conversion multi-air conditioning system. Firstly, the energy consumption of a comprehensive office building of a university in Xi'an is simulated by DeST software, and the load of heating season and refrigeration season is analyzed statistically. Secondly, the load characteristics of the system under different load rates are studied by taking a variable-frequency multi-connected air conditioning system installed in the office building as the research object. The economic analysis and comparison of four different air conditioning system schemes (frequency conversion multiple air conditioning system, underground water source heat pump air conditioning system, air source heat pump air conditioning system, split room air conditioner system) are also carried out. In addition, through the analysis of the experimental results of the office building, the applicability of the variable-frequency multi-air conditioning system in this type of building is verified. Through the above research, it is concluded that the multi-frequency air-conditioning system is used in the office building. This paper also theoretically studies the pipeline resistance of variable-frequency multi-air conditioning system under different load rates, obtains the characteristics of pipeline resistance and its influencing factors, and puts forward a method to reduce the pressure drop of the system. In the design of variable-frequency multi-connected air conditioning system, it is necessary to make the designed indoor unit in the same floor and select the shorter riser and the appropriate pipe diameter as far as possible. Finally, according to the pipeline resistance characteristics of the variable frequency multi-air conditioning system, the optimization design of an existing system is carried out. The research in this paper has a positive effect on the deep understanding of the characteristics of energy consumption of air conditioning in comprehensive office buildings, the resistance characteristics of multi-line air conditioners with frequency conversion and the engineering design of multi-connected air conditioning systems with frequency conversion.
【学位授予单位】：西安建筑科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU831

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