冷辐射空调在广州地区医疗建筑中的应用研究

发布时间：2018-05-19 09:21

  本文选题：广州地区 + 医疗建筑　； 参考：《广州大学》2017年硕士论文

【摘要】：近年来,辐射供冷作为一种新型空调方式,具有环境友好和低能耗的优势,综合经济效益优于传统空调,并已成功应用于广州珠江城大厦等大型公共建筑中。冷辐射空调系统的舒适性和节能效果与气候特征、建筑类别及工程质量等密切相关,尤其在广州等温度湿度高的地区,如果设计、安装或运行管理不当,将会存在结露、影响室内卫生条件等技术风险。因此,本文以广州市某综合医院装修改造项目为研究对象,通过理论分析、现场测试以及软件模拟等方法,对冷辐射空调系统在医疗建筑中的运行效果和实际存在问题进行研究分析,为冷辐射空调系统在广州地区医疗建筑中的应用和发展提供参考。首先调查论述了广州地区医疗建筑的能耗现状以及该地区医疗建筑空调系统存在的问题。其次,依据冷辐射空调系统换热机理以及传热过程特点,对系统的室内热舒适性评价进行了介绍。然后,对冷辐射空调系统方案进行了节能性分析,其结果显示:在广州地区医疗建筑中,冷辐射空调系统比风机盘管+新风系统节能13.3%,具有一定的节能潜力。最后,通过现场测试了解该系统实际运行的舒适性以及存在的问题,发现实际运行时存在室内温度高、湿度大、冷辐射顶板结露严重等现象,具体原因:第一,实际人员密度和设备功率密度比设计值大,设计负荷计算小,导致末端冷辐射顶板供冷能力不足;第二,室内热湿源、新风口、回风口相对位置不当,气流组织不合理,房间顶部热湿空气无法及时排出;第三,实际运行中,冷辐射空调控制系统不精准,不能及时根据室内温湿度变化情况,调节冷冻水流量以及新风的送风量。针对现场测试出现的问题,以理疗区为例,利用Phoenics模拟软件对该房间送风参数、冷辐射顶板温度以及室内热源、新风口、回风口相对位置进行最优化选择,并得出优化结论:第一,为避免冷辐射顶板结露,并同时满足供冷需求和室内舒适性要求,冷顶板辐射温度宜设置为18℃;新风送风参数:温度17℃、相对湿度55%;第二,合理布置室内新风口、回风口以及室内热湿源相对位置,使得室内气流组织有利于及时排走顶部热湿空气,也是防止冷辐射顶板结露的重要措施。因此,冷辐射空调在温湿度控制精准、施工安装规范、运行管理合理等条件下,通过合理选择设计参数,准确的计算末端辐射供冷量及新风量,合理布置风口,冷辐射空调系统应用于广州地区医疗建筑中是可行的。
[Abstract]:In recent years, as a new type of air conditioning system, radiation cooling has the advantages of environmental friendliness and low energy consumption, and its comprehensive economic benefits are superior to those of traditional air conditioners. It has been successfully applied to large public buildings such as Guangzhou Pearl River City Mansion. The comfortableness and energy saving effect of cold radiation air conditioning system are closely related to climate characteristics, building category and engineering quality. Especially in high temperature and humidity areas such as Guangzhou, if the design, installation or operation management is not proper, there will be condensation. Technical risks such as affecting indoor hygiene conditions. Therefore, this paper takes the renovation project of a general hospital in Guangzhou as the research object, through theoretical analysis, field testing and software simulation, etc. In order to provide reference for the application and development of the cold radiation air conditioning system in the medical building in Guangzhou, the operation effect and practical problems of the cold radiation air conditioning system in the medical building are studied and analyzed. Firstly, the present situation of energy consumption of medical buildings in Guangzhou and the existing problems of air conditioning system of medical buildings in Guangzhou are discussed. Secondly, according to the heat transfer mechanism and heat transfer process of the cooling radiation air conditioning system, the indoor thermal comfort evaluation of the system is introduced. The results show that in the medical buildings in Guangzhou, the cold radiation air conditioning system is more energy efficient than the fan coil unit fresh air system, and has a certain energy saving potential. Finally, through the field test to understand the comfort of the actual operation of the system and existing problems, found that the actual operation of high indoor temperature, high humidity, cold radiation roof condensation serious phenomenon, specific reasons: first, The actual personnel density and equipment power density are larger than the designed value, and the design load calculation is small, which results in insufficient cooling capacity of the end cooling radiation roof. Second, the relative position of the indoor heat and humidity source, the new tuyere and the return tuyere are improper, and the airflow organization is unreasonable. The hot and wet air on the top of the room can not be discharged in time. Thirdly, in actual operation, the control system of cold radiation air conditioning system is not accurate, and can not adjust the flow rate of refrigerated water and the air volume of fresh air according to the change of indoor temperature and humidity in time. Aiming at the problems in the field test, taking the physiotherapy area as an example, the Phoenics simulation software is used to optimize the air supply parameters, the temperature of the cold radiation roof and the relative position of the indoor heat source, new tuyere and return tuyere, and the relative position of the indoor heat source, new tuyere and return tuyere is optimized. The optimized conclusions are as follows: first, in order to avoid condensation of cold radiation roof, and to meet the requirement of cooling and indoor comfort, the radiation temperature of cold roof should be set at 18 鈩，

本文编号：1909555