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Abstract：
The characteristics of heat transfer load from the non-air-conditioned (NAC) area can help to understand the complex airflow movement and thermal physical mechanisms inside large space buildings. Based on building energy modeling, the indoor thermal environment and building energy consumption of a plant for computerized numerical control (CNC) machine tools are studied. Considering the form of the stratified air-conditioning system and the phenomenon of heat retention near the roof in the plant, the double zone and triple zone models are established. The vertical air temperature, the parameters of the terminal of the air-conditioning system and the heat/cool source system of the plant in summer and winter were measured on site, which verifies the accuracy of the established model. Based on the validated model, the proportion of heat transfer load from the NAC area is calculated, at the range of about 60%-85%. The positive influence of the roof heat transfer coefficient on the sensible heat load in the NAC area is revealed. The recommended value of the non-dimensional zone-mixing flow rate between the air-conditioned (AC) and NAC areas is given, with 30% (in summer). The results of this work can help understand the composition of the stratified air-conditioning load in large spaces and optimize the design of air distribution.
摘要：
非空调（NAC）区域的传热负荷特性可以帮助了解大空间建筑物内部复杂的气流运动和热物理机制。基于建筑能源建模,研究了计算机数控（CNC）机床工厂的室内热环境和建筑能耗。考虑到分层空调系统的形式和厂房屋顶附近的保温现象，建立了双区和三区模型。垂直空气温度，现场测量了夏季和冬季工厂空调系统末端和热源/热源系统的参数，验证了所建立模型的准确性。基于验证的模型，计算NAC面积的传热负荷比例，在约60%-85%的范围内。揭示了屋顶传热系数对NAC地区显热负荷的积极影响。给出了空调（AC）和NAC区域之间的无量纲区域混合流量的推荐值，30%（夏季）。这项工作的结果可以帮助了解大空间分层空调负荷的组成并优化空气分配设计。
