壁面辐射供冷与独立新风复合空调的数值模拟研究

发布时间：2018-08-05 12:35

【摘要】：为贯彻艰苦奋斗、勤俭节约、反对奢侈浪费的方针,对于党政机关办公用房的建设,国家政府多次制定了相关标准。相关标准规定了各级工作人员的办公室使用面积。并且,大多数非机关独立办公用房亦是趋向小型化、简约化。与此同时,辐射供冷空调方式是现行研究的热点。在办公室的人员绝大多数时候是坐着的,少些时候是站着的。这两种状态下人员与竖直壁面的直接辐射换热面积,比与顶板和地板的直接辐射换热面积大,并且小型办公室的竖直墙面面积是大于地板和顶板的。故对此类简约的小型办公室采用竖直壁面辐射供冷为背景、将独立新风直接送至工作区的新型复合空调。本文针对一个位于西安的简约单人办公室,采用传统的对流换热空调和以竖直壁面辐射供冷为背景、将独立新风直接送至工作区的新型复合空调,建立了符合实际的办公室物理几何模型。采用重整化群RNG k-ε两方程湍流模型,利用软件fluent对两种空调方式条件下办公室的室内空调环境进行了数值模拟研究。对比分析了两种空调方式下的室内温度场和气流速度场,并且分析了室内办公人员前后左右的热舒适情况。模拟结果表明:(1)传统空调供冷所需要的风量大,进而造成室内速度场容易引起吹风感,而辐射供冷复合空调则可以克服这一缺点;(2)传统空调设计,力求室内气流场均匀、温度场均匀,使得新风与旧风充分混合,则造成人员所呼吸进入体内的空气不再新鲜。而本文中的辐射供冷复合空调是将独立新风直接送至人员呼吸区,使得呼吸的空气更加新鲜;(3)辐射供冷复合空调中,新风承担的冷负荷很少,绝大部分是靠辐射面所承担,辐射面辐射供冷提供的冷量起着主要作用。(4)通过改变排风口的位置优化空调,可发现排风口布置于热区上方,有利于室内得热量的排除,进而减小空调承担的冷负荷。通过相关资料及对复合空调的单人办公室的数值模拟研究,可以发现,在良好的设计条件下,以竖直壁面辐射供冷为背景、将独立新风直接送至工作区的新型复合空调系统优于传统的对流换热空调系统,是一种较好的空调方式,可为简约的小型办公室建立舒适的室内空调环境。
[Abstract]:In order to carry out the principles of hard struggle, thrift and extravagance and waste, the state government has formulated several related standards for the construction of office houses for party and government organs. The relevant standards specify office space for staff at all levels. Moreover, most non-government independent office rooms also tend to be miniaturized and simplified. At the same time, radiation cooling air conditioning is the focus of current research. Most of the people in the office are sitting and less standing. Under these two conditions, the area of direct radiation heat transfer between personnel and vertical wall is larger than that with roof and floor, and the area of vertical wall of small office is larger than that of floor and roof. So this kind of simple small office uses vertical wall radiation cooling as the background, and sends the independent fresh air directly to the working area of the new composite air conditioning. This paper aims at a simple single person office in Xi'an, using traditional convection heat transfer air conditioning and a new type of composite air conditioning system with vertical wall radiation cooling as the background, and sending independent fresh air directly to the working area. A practical geometry model of office physics is established. The turbulence model of renormalization group RNG k- 蔚 equations was used to simulate the indoor air conditioning environment in the office under two different air conditioning modes using the software fluent. The indoor temperature field and airflow velocity field under two kinds of air conditioning modes are analyzed, and the thermal comfort of indoor office personnel is analyzed. The simulation results show that: (1) large amount of air is needed for cooling of traditional air conditioning, which leads to air blowing feeling easily in indoor velocity field, and radiation cooling compound air conditioning can overcome this shortcoming, (2) traditional air conditioning design, strive for uniform indoor air flow field, If the temperature field is uniform, the fresh air will be mixed with the old wind, and the air that the personnel breathe into the body will no longer be fresh. The radiation cooling composite air conditioning in this paper is to send the independent fresh air directly to the personnel breathing area, which makes the breathing air more fresh. (3) in the radiation cooling composite air conditioning, the fresh air bears very little cooling load, most of which are borne by the radiation surface. (4) by changing the position of the exhaust air outlet, it can be found that the exhaust air outlet is arranged above the hot area, which is conducive to the removal of indoor heat and thus reduces the cooling load borne by the air conditioner. Through the relevant data and the numerical simulation of the single office of composite air conditioning, it can be found that under the good design conditions, the vertical wall radiation cooling as the background, The new composite air conditioning system, which sends the independent fresh air directly to the working area, is superior to the traditional convection heat transfer air conditioning system. It is a better way of air conditioning and can establish comfortable indoor air conditioning environment for the simple and small office.
【学位授予单位】：西安科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU831

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