大空间建筑空调与混合通风系统联合运行节能研究

发布时间：2018-05-30 02:13

本文选题：大空间建筑 + 数值模拟　；参考：《广州大学》2014年硕士论文

【摘要】：大空间公共建筑规模大，能耗高，其节能潜力也大。而随着绿色建筑理念和实践的推行，生态建筑思想已进入了大空间建筑的领域中。结合大空间建筑特点，应用通风原理，研究设计一套混合通风系统与空调联合运行，代替传统的全程空调，以此生态建筑技术作为减少建筑能耗的技术措施，其中本文定义的混合通风系统包括热压通风，机械排风辅助热压通风及用于对湿度要求不严格的建筑的直接蒸发冷却通风降温方式。本文以广州某航站楼指廊空调节能为研究对象，，通过Fluent数值模拟，并以室内人员区域的温度和风速作为室内通风的评价参数，得出进风口距地高度、进风口尺寸高度、排风压差、室内热源及室外温度对大空间建筑中采用热压通风和机械排风辅助热压通风的影响情况。结果表明：排风压差的增加会主导室内气流组织，抑制了大空间热力分层现象；若使机械排风辅助于热压通风，进风口形式需满足一定要求；进风口距地高度为0.5m且其尺寸高度为1.5m为最佳进风开口形式；在对湿度要求不严格的建筑中，采用直接蒸发冷却通风降温方式能进一步降低室温。以机械通风量、室内热源、室外温度作为可变因子，利用多元线性回归方法建立不同进风口开口形式下的人员区温度及风速的回归方程，以方差分析法对实验结果分析，得出在混合通风模式下，室外温度和机械排风量分别是室内温度、风速的最显著影响因子。结合已考虑风速及湿度补偿后的热舒适适应性模型和广州地区典型年过渡季的逐时气象参数，得出广州地区采用空调与混合通风系统联合运行下各通风空调模式间切换的室外干球温度转换值和各混合通风模式下的可用舒适小时数。最后，针对具体影响因子下的建筑，分析在空调与混合通风系统联合运行下的主要设备的能耗模型，结合DeST计算得到的建筑逐时冷负荷，选择该建筑所用的设备类型。同时计算5、6、10月份，在不同运行策略下的各主要设备的运行能耗，从而获得通过采用此联合运行策略下广州地区大空间建筑在最佳进风口开口形式下节能率高达73.3%。对室内湿度有严格要求的建筑，节能率降为62.9%，两者均都可满足绿色建筑评价标准关于节能率为60%的优选项要求。而通过改变进风口开口形式，该策略节能率受其较大影响。
[Abstract]:Large-space public building scale, high energy consumption, its energy-saving potential is also great. With the implementation of the concept and practice of green architecture, ecological architecture has entered the field of large space architecture. Combined with the characteristics of large space architecture and applying the ventilation principle, this paper studies and designs a set of mixed ventilation system and air conditioning combined operation, which replaces the traditional whole process air conditioning, and takes the ecological building technology as the technical measure to reduce the building energy consumption. The mixed ventilation system defined in this paper includes hot press ventilation mechanical ventilation assisted hot press ventilation and direct evaporative cooling ventilation for buildings with low humidity requirements. This paper takes the air conditioning energy saving of the digital corridor of a Guangzhou terminal as the research object, takes the temperature and wind speed of the indoor personnel area as the evaluation parameters of indoor ventilation through Fluent numerical simulation, and obtains the air inlet height from the ground height and the inlet size height. The influence of air pressure difference, indoor heat source and outdoor temperature on hot press ventilation and mechanical ventilation in large space buildings. The results show that the increase of exhaust pressure difference will dominate the indoor airflow organization and restrain the phenomenon of thermal stratification in large space, and if the mechanical exhaust air is assisted by hot press ventilation, the type of inlet should meet certain requirements. The air inlet is 0.5m from ground height and its dimension height is 1.5m. In the buildings where the humidity requirement is not strict, the room temperature can be further reduced by adopting direct evaporative cooling ventilation and cooling method. Taking mechanical ventilation, indoor heat source and outdoor temperature as variable factors, the regression equations of the temperature and wind speed in different air inlet openings were established by using multiple linear regression method. The experimental results were analyzed by variance analysis method. In the mixed ventilation mode, outdoor temperature and mechanical exhaust volume are the most significant factors of indoor temperature and wind speed, respectively. Combined with the thermal comfort adaptability model after considering wind speed and humidity compensation and the hourly meteorological parameters of typical transitional seasons in Guangzhou area, The outdoor dry ball temperature conversion values and the number of available comfortable hours under the combined operation of air conditioning and mixed ventilation system in Guangzhou are obtained. Finally, the energy consumption model of the main equipment under the combined operation of air conditioning and mixed ventilation system is analyzed for the buildings under specific influence factors. Combined with the hourly cooling load calculated by DeST, the type of equipment used in the building is selected. At the same time, the energy consumption of each main equipment under different operation strategies is calculated in October, and the energy saving rate of large space buildings in Guangzhou area under the optimal opening form of air inlet is obtained by adopting this combined operation strategy as high as 73.3%. For buildings with strict indoor humidity requirements, the energy saving rate is reduced to 62.9, both of which can meet the requirements of the green building evaluation standard for energy saving rate of 60%. By changing the opening form of the inlet, the energy saving rate of the strategy is greatly affected by it.
【学位授予单位】：广州大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU831

【参考文献】