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Thermal mass activation by hollow core slab coupled with night ventilation to reduce summer cooling loads

机译：中空板激活热质量并结合夜间通风以减少夏季的制冷负荷

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This study deal with the analysis of the effectiveness of free cooling ventilation strategies coupled with thermal mass activation to reduce peak cooling loads. A numerical simulation of the temperatures distribution of an office placed in Milan, Italy, during the month of July, is conducted on a Simulink~® dynamical model. No air-conditioned system is present but two different free cooling systems are analysed and compared. Both systems act a primary ventilation during the day and a night ventilation during the non-occupancy period but the first is a traditional mixing ventilation system, the other is a thermal mass activation system, i.e. the outdoor ventilation air, before entering the room, flows through the ducts of the hollow core concrete ceiling slab. The performances of the two systems are investigated by means of time profile analyses of indoor operative temperatures and by means of frequency temperature distributions during the occupancy period. The cooling performances are measured by two different discomfort indexes: one represents the discomfort time percentage during occupation period, the other the discomfort weighted on the distance of calculated operative temperature from the acceptable temperature interval. This paper, in last analysis, tries to highlight the possibilities on cooling loads reduction and on thermal comfort increase in Mediterranean climate, connected to new strategies for thermal mass activation and night ventilation.
机译：本研究分析了自然冷却通风策略与热质量激活相结合以减少峰值冷却负荷的有效性。使用Simulink®动态模型对位于意大利米兰的办公室在7月的温度分布进行了数值模拟。没有空调系统存在，但对两个不同的自然冷却系统进行了分析和比较。两种系统在白天都起到主要通风作用，而在非占用期间则起着夜间通风作用，但是第一种是传统的混合通风系统，另一种是热质量激活系统，即进入房间之前的室外通风空气流动。通过空心混凝土天花板的管道。通过室内工作温度的时间曲线分析以及在使用期间的频率温度分布，研究了这两个系统的性能。冷却性能由两个不同的不适指数来衡量：一个代表占用期间的不适时间百分比，另一个代表以计算的工作温度与可接受的温度间隔的距离加权的不适度。在最后的分析中，本文试图强调与地中海热激活和夜间通风的新策略相关的地中海气候中减少制冷负荷和增加热舒适性的可能性。

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