开窗对具有辐射冷顶板空调系统的室内热环境的影响分析

发布时间：2018-01-10 13:00

本文关键词：开窗对具有辐射冷顶板空调系统的室内热环境的影响分析　出处：《湖南大学》2015年硕士论文　论文类型：学位论文

【摘要】：随着社会对建筑节能的重视,辐射冷顶板作为一种节能效果明显的空调形式越来越受到业界关注。辐射冷顶板空调系统的优势不仅在于其节能性,还在于其良好的舒适性。本文的主要研究对象为具有辐射冷顶板空调系统的室内热环境。目前对具有辐射冷顶板空调的室内热环境的研究中,主要考虑的影响因素是辐射冷顶板的传热特性、顶板工作温度、通风系统的送风温度和送风速度等固有因素,而对人为因素如开窗、开门等行为的考虑很少。本文分析研究了开窗对具有辐射冷顶板空调系统的室内热环境的影响。文章首先介绍了辐射供冷技术的发展、研究现状以及辐射冷顶板系统的特点、分类,并对辐射冷顶板空调系统的设计方法和传热过程做了介绍。通过实验的方式研究了开窗对具有辐射冷顶板的室内热环境的影响,实验中测量的数据包括房间壁面温度、室内空气温湿度等。实验结果表明:开窗后室内空气温度变化迅速,幅度大,且上部空气温度变化比下部空气更为剧烈。开窗5分钟内是室内空气温度变化程度最大的,随着时间的推移,室内空气温度变化速度越来越慢,幅度也越来越小,55分钟时室内热环境趋于稳定。同时,通过CFD模拟的方法对开窗后具有辐射冷顶板空调的室内热环境的变化情况进行了模拟研究。建立了辐射冷顶板空调系统房间的物理模型,通过负荷计算确定了房间各项负荷。模拟结果显示:开窗后首先受到影响的是房间的上部空气,且温度变化响应迅速,而房间工作区的空气温度变化较为缓和;房间空气的升温过程有一定的方向性,主要是由上至下,由发热体顶部至发热体四周,且室内空气的升温速度是逐渐减慢的;房间上部空气有较大的温度梯度,但是工作区的温度梯度不大,人体头部以及脚踝之间的温差始终保持在可接受范围内;与实验结果相比模拟中房间空气温度升高幅度较小,由此可以得出开窗对较大房间的影响要明显小于较小房间。
[Abstract]:With the attention of the society to the building energy saving, the radiation cooling roof as a kind of air conditioning with obvious energy-saving effect has attracted more and more attention. The advantage of the radiation cold roof air conditioning system lies not only in its energy conservation. The main research object of this paper is the indoor thermal environment with radiant cold roof air conditioning system. The main factors considered are the heat transfer characteristics of the radiant cold roof, the working temperature of the roof, the air supply temperature and the air velocity of the ventilation system, and the artificial factors such as window opening. The effect of window opening on the indoor thermal environment with radiant cooling roof air conditioning system is analyzed and studied in this paper. Firstly, the development of radiation cooling technology is introduced. The research status and the characteristics and classification of radiation cold roof system. The design method and heat transfer process of radiant cold roof air conditioning system are introduced. The effect of window opening on the indoor thermal environment with radiant cold roof is studied through experiments. The measured data include room wall temperature, indoor air temperature and humidity, etc. The experimental results show that the indoor air temperature changes rapidly and greatly after opening the window. The change of upper air temperature is more intense than that of lower air. The change of indoor air temperature is the biggest in 5 minutes, and with the passage of time, the indoor air temperature changes more and more slowly. The range is getting smaller and smaller, and the indoor thermal environment tends to be stable after 55 minutes. At the same time. The change of indoor thermal environment with radiant cold roof air conditioning after window opening was simulated by CFD simulation method, and the physical model of the room of radiation cold roof air conditioning system was established. The simulation results show that the upper air of the room is first affected by the window opening, and the temperature response is rapid, while the air temperature change in the working area of the room is relatively moderate. The heating process of the room air has certain directionality, mainly from the top to the bottom, from the top of the heating body to around the heat body, and the heating rate of the indoor air is gradually slowed down; The air in the upper part of the room has a large temperature gradient, but the temperature gradient of the working area is small, and the temperature difference between the human head and the ankle is always in acceptable range; Compared with the experimental results, the temperature of room air in the simulation is smaller than that in the small room, so it can be concluded that the effect of window opening on the larger room is obviously smaller than that of the smaller room.
【学位授予单位】：湖南大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU111

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