重庆地区多联机节能运行模式研究

发布时间：2018-02-28 02:55

本文关键词： 水冷式多联机制冷剂管路阻力损失制冷量衰减能效比经济性分析　出处：《重庆大学》2014年硕士论文　论文类型：学位论文

【摘要】：多联机空调系统，即可变制冷剂流量空调系统(简称VRV)，由日本大金公司于1982年开发推出。多联机是在传统房间分体空调器基础上发展而来的，它实现了一(多)台室外机和多台室内机的连接。与传统的水冷冷水机组+热水锅炉+空调末端的中央空调相比，它具有设计、安装、运行及维护管理简单、方便的特点，另外它能将传统中央空调系统的制冷机房、锅炉房所占用的建筑空间节省出来，这在办公、商场、宾馆等房价、地价极高的建筑中，能够节约一大笔初投资费用并可以在投入运行后获得更多的收益。多联机空调目前在市场上得到了较为广泛的应用。但随着应用范围的推广，传统的风冷式多联机系统的一些不足逐渐暴露出来。在这样的背景下，一种新的多联机空调形式在20世纪兴起，这就是水冷式多联机空调系统。实际上可以把它看成是多联机与水源热泵或水环热泵相结合的一种空调系统。相比于传统的风冷式多联机空调系统，水冷式多联机的室外机可以实现分层设置，这样就减小甚至消除了室外机和室内机的高差，使之在高层建筑和多层建筑上可以得到推广使用。此外，由于水冷式多联机的制冷剂管路长度缩短，制冷剂管路的阻力损失减小，因此由于制冷剂管路过长而造成的制冷量衰减就会减小，从而增加了多联机空调系统的能效比（EER）。水冷式多联机相当于在风冷式多联机的基础上增加了一套水系统，因此势必造成初投资的提高，因此水冷式多联机在重庆地区的推广和使用并没有取得较大进展。本文将制冷剂管段的阻力损失计算作为研究重点，通过在一个已经设计完成的风冷式多联机空调系统工程上进行改造，，设计一套水冷式多联机空调系统。分别计算两种系统形式下有代表性的制冷剂管路的阻力损失，并分析计算各自的制冷量衰减和系统能效比（EER）下降，比较两种系统形式的节能性。另外计算了两种系统形式下的初投资和年运行费，比较两种系统形式的经济性，从而指导重庆地区进行水冷式多联机空调系统的选用。
[Abstract]:The variable refrigerant flow air conditioning system (VRVN), developed in 1982 by Japan's Dajin Company, is a multi-on-line air conditioning system based on traditional room air conditioners. It realizes the connection between one or more outdoor units and multiple indoor units. Compared with the central air conditioning system at the end of the hot water boiler of the traditional water-cooled chillers, it has the characteristics of simple design, installation, operation and maintenance management and convenience. In addition, it can save the building space occupied by the refrigeration machine room and boiler room of the traditional central air conditioning system. This can be done in buildings with extremely high housing prices and land prices, such as offices, shopping malls, hotels, etc. It can save a lot of initial investment cost and make more profit when put into operation. Multi-on-line air conditioning has been widely used in the market at present. However, with the popularization of application scope, some shortcomings of traditional air-cooled multi-on-line system are gradually exposed. In 20th century, a new form of multi-on-line air conditioning came into being. This is the water-cooled multi-on-line air conditioning system. In fact, it can be regarded as a kind of air conditioning system combined with water source heat pump or water loop heat pump. Water-cooled multi-on-line outdoor units can be layered, which reduces or even eliminates the difference in height between outdoor and indoor units, making them widely used in high-rise buildings and multi-storey buildings. As the length of the refrigerant pipeline is shortened and the resistance loss of the refrigerant pipeline is reduced, the cooling capacity attenuation due to the long length of the refrigerant pipeline will be reduced. Thus, the energy efficiency ratio of the multi-line air conditioning system is increased. The water-cooled multi-line system is equivalent to adding a set of water system on the basis of air-cooled multi-on-line system, which will inevitably result in the increase of initial investment. Therefore, the popularization and use of water-cooled multi-line in Chongqing area has not made great progress. In this paper, the calculation of resistance loss in refrigerant pipe section is regarded as the key point of the research, and the project of air-cooled multi-on-line air conditioning system that has been designed and completed has been reformed. A set of water-cooled multi-on-line air conditioning system is designed. The resistance losses of representative refrigerant pipes under two systems are calculated, and the respective cooling capacity attenuation and the system energy efficiency ratio (EER) decrease are analyzed and calculated. In addition, the initial investment and annual operating cost of the two systems are calculated, and the economy of the two system forms is compared to guide the selection of water-cooled multi-on-line air conditioning system in Chongqing area.
【学位授予单位】：重庆大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU831

【参考文献】