變頻多聯(lián)式空調(diào)系統(tǒng)適用性及管路阻力特性研究
[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.
【學(xué)位授予單位】:西安建筑科技大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2015
【分類號】:TU831
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