【作者】 杨妹；

【导师】 南晓红；

【作者基本信息】 西安建筑科技大学 ， 供热、供燃气、通风及空调工程， 2010， 硕士

【摘要】 目前我国正在大力推行节能减排政策,节约并有效利用能源迫在眉睫。而变频多联机由于其舒适、节能、维护简单等特点,也越来越得到广泛的应用。但是关于变频多联式空调系统变负荷特性的研究工作目前还不够深入,对该空调系统进行部分负荷特性的研究对系统优化、节能设计及运行方式研究具有重要的意义和价值。对采用变频多联式空调系统的房间气流组织研究有助于人们认识该空调系统的舒适性机理。本文针对西安建筑科技大学环境与市政工程学院办公楼的一套变频多联式空调系统进行了夏季不同部分负荷率下制冷剂液管的温度沿程变化的实验测试,并理论分析了夏季运行状况和能耗特性。文中理论计算了夏季制冷时不同部分负荷率下系统的能效比EER,结果表明变频多联式空调系统在50%-80%部分负荷率下运行时,其系统能效比EER较其他负荷率运行时高。并按照多联式空调(热泵)机组国家标准(GB/T18837-2002)中提供的计算方法,对变频多联式空调系统综合部分负荷性能系数IPLV进行了计算。本文还利用英国Solartron公司的IMP数据采集系统对该办公大楼的一间办公房间夏季不同送风参数下室内温度场进行了实验测试,利用CFD对室内温度场和速度场进行了数值模拟。模拟分析的结果和测试结果吻合较好,结果表明,低风速时室内温度场分布较为均匀,室内工作区域的速度值都小于0.3m/s,满足规范要求。送风温度(即室内设定温度)较低时,室内工作区域内的温度较低,人体有明显的冷感；送风温度(即室内设定温度)较高时,室内工作区域内的温度分布较为均匀,满足夏季人体要求的舒适温度。更多还原

【Abstract】 At present, energy-saving and emission reduction policies are implemented with great efforts in China, conservation and efficient use of energy is of great urgency. The variable refrigeration flow air conditioner(VRV) is widely used recently due to its merits such as energy saving, thermal comfort and easily maintainance, etc. However the studies on partial load characteristics of this system are far from satisfaction, which being very important for VRV system’s optimization, energy-saving design and reasonable operation mode setting. The study on air distribution of the room by installed VRV air-conditioner would be valuable.The temperature change curves along the refrigerant liquid pipe in summer were tested for an MDV system, which is installed in School of Environmental & Municipal Engineering of Xi’an University of Architecture & Technology. Furthermore, the variable load ratio characteristic of the system and energy cost perfomance were analized. The EER under different load for cooling mode was calculated, and the result shows that EER under the range of load ratio from 50% to 80% is higher than that under other load ratios. According to the national standard of the Multi-split air-conditioning (heat pump) unit (GB/T18837-2002), the IPLV of this system is also calculated.The temperature distributions were measured under the different inletting parameters of an office in Xi’an with VRV air conditioning by data acquisition system of IMP of Solartron firm in Britain. The numerical simulations were also carried out for the above situation. The experimental results match well with the simulation results, which show that the indoor temperature field distribution is more uniform at low wind velocity, the wind velocity of indoor working area is less than 0.3m/s, which satisfy the standard requirement. When inletting temperature (namely indoor set temperature) is lower, the temperatures of indoor working area are lower, so people will feel cold obviously; When inletting temperature (namely indoor set temperature) is higher, the temperature distribution of indoor working area is more uniform, which meet the requirement of thermal comfort for people.更多还原