地埋管直供条件下辐射地板供冷系统控制策略优化研究

发布时间：2018-02-09 09:27

  本文关键词： 地埋管直供 辐射供冷 置换通风 控制策略 能耗预测　出处：《山东建筑大学》2017年硕士论文　论文类型：学位论文

【摘要】：地板辐射供冷耦合置换通风系统的空调技术比较成熟,但是在国内非常成功的应用实例并不常见。该系统最大的优点是能够实现冬夏共用同一套末端装置,节省投资费用。其次,系统的舒适性也较好,冬季能够实现“头冷脚暖”的空调环境,夏季通过置换通风将室内的空气均匀混合,减小垂直方向上的温度分层,维持室内空气品质良好。但是这种复合空调系统需要精确的控制系统,实时监测并调控室内温湿度,避免地板表面结露,还要考虑楼板的热惰性及温度延迟现象。在尽量减少能耗的基础上达到更佳的空调效果是本文研究的目的。本文以地埋管直供条件下的地板辐射供冷空调系统为研究对象,以济南安泰智能工程有限公司办公楼的空调系统为模型,以TRNSYS能耗仿真模拟软件为工具,通过实验和模拟相结合的手段,对该空调系统的控制运行策略和室内环境状况进行了分析研究。在辐射供冷与置换通风联合的条件下,通过对该办公建筑中五楼室内温度的实时监测,以及对实验数据的大量分析,总结出室内温度分布规律为垂直方向上明显的温度分层。这对进一步分析房间温度在空间垂直方向上变化趋势有较大的帮助。对于地板辐射,当供水流量为工程经验值20000kg/h,分水器将总的供水量平均分配到每一层时,各楼层温度存在明显差异,并不是所有房间的温度都能达到空调设计要求,常有高于27℃的情况。对此,提出供水流量根据室温反馈进行按比例调节的方案,并且通过模拟发现该方案能够有效缓解各楼层温度不均的现象。对于地板辐射供冷系统中常常会出现的地板结露现象,针对常用避免结露的两种方法(保持相对湿度不变的情况下,降低环境空气温度使其露点温度小于地板表面温度;在相同送风温度的条件下,降低送风湿度)通过模拟实验发现在地板辐射与置换通风相结合的空调系统中降低置换通风的相对湿度是避免地板结露最有效的方法。通过分析夏季室内温度的变化情况,针对异常高温天气提出了一种新的控制策略,并对此展开了模拟研究:通过预测室外温度,提前对地源井供水总流量进行控制。该方案虽然可以起到缓冲室内温度大幅度升降的作用,但是由于辐射地板的热惰性使得供冷量与供水流量变化并不成正比,而且这样还会造成机组与泵的能耗增加。预判方案的提出虽然没有解决异常天气对室温的影响,却也证实了蓄热地板良好的稳定性。从本实验方案的提出至验证其不足的过程中,证实了地埋管直供复合空调系统中改变供水流量对室内温度环境状况影响较小,对下一步的控制策略优化会有很大的指导意义。
[Abstract]:The air conditioning technology of floor radiation cooling coupled displacement ventilation system is quite mature, but it is not very common in China for very successful applications. The biggest advantage of this system is that it can share the same terminal device in winter and summer. Second, the comfort of the system is better. In winter, the air conditioning environment of "head cold foot is warm" can be realized. In summer, the indoor air is mixed evenly by displacement ventilation, and the vertical temperature stratification is reduced. Maintain good indoor air quality. But this composite air conditioning system requires accurate control system, real-time monitoring and control of indoor temperature and humidity, to avoid floor surface dew, The purpose of this paper is to achieve better air conditioning effect on the basis of reducing energy consumption as far as possible. In this paper, the floor radiant cooling air conditioning system under the condition of direct supply of underground pipes is taken as the research object. Taking the air conditioning system of the office building of Jinan Antai Intelligent Engineering Co., Ltd as the model, and using the TRNSYS energy consumption simulation software as the tool, the method of combining experiment and simulation is adopted. The control operation strategy and indoor environment condition of the air conditioning system are analyzed and studied. Under the condition of radiation cooling and displacement ventilation, the indoor temperature of the fifth floor of the office building is monitored in real time. By analyzing a large number of experimental data, it is concluded that the indoor temperature distribution is obviously stratified in the vertical direction, which is helpful for further analysis of the change trend of room temperature in the space vertical direction, and for floor radiation, When the water supply flow is an engineering experience value of 200kg / h and the water separator distributes the total water supply equally to each floor, there is a significant difference in the temperature of each floor, and not all rooms can meet the requirements of air conditioning design, and often the temperature is higher than 27 鈩，

本文编号：1497608