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Enhancement of heat transfer in office buildings during night cooling - reduced scale experimentation

机译：增强夜间降温期间办公楼的热传递-减少规模的实验

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Most office buildings are designed to be ventilated and cooled using mechanical systems. However, in a temperate climate, passive ventilation and cooling techniques can reduce energy consumption when the outdoor temperatures are favourable, e.g., at night. Nevertheless, decorative components like the suspended ceiling (SC) contribute to insulation, preventing the desired thermal exchange with the slab. This work investigates an innovative solution to the optimization of the night cooling phenomenon by using a SC with a peripheral gap and taking advantage of the plenum formed by the space between the slab and the SC for cooling purposes. The experiments were carried out on a reduced scale model. It was found that a SC with a gap allows part of the heat dissipated in the room during the occupation period to be used to heat the slab, thus reducing the air temperature during the day, in comparison with a conventional SC with no gap. Moreover, a SC with a gap, and with supply and extraction slots placed above it, improves the air cooling during the night, and reduces the temperatures in the occupation zone during the following day, in comparison with a conventional SC with no gap, and with the ventilation slots located below it.
机译：大多数办公楼设计为使用机械系统进行通风和冷却。然而，在温带气候下，当室外温度有利时，例如在晚上，被动通风和冷却技术可以减少能耗。尽管如此，诸如吊顶（SC）之类的装饰性部件仍有助于隔热，从而阻止了与平板的所需热交换。这项工作研究了一种创新的解决方案，该解决方案是通过使用带有外围间隙的SC并利用由平板和SC之间的空间形成的气室进行冷却的方式来优化夜间降温现象。实验在缩小比例模型上进行。已经发现，与没有间隙的常规SC相比，具有间隙的SC使得在占用期间在房间中散发的热量的一部分可以用于加热板坯，从而降低了白天的空气温度。而且，与没有间隙的常规SC相比，具有间隙的SC以及在其上方放置的供气和抽气槽可以改善夜间的空气冷却，并在第二天降低占用区域的温度，并且通风槽位于其下方。

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