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Investigation on the thermal comfort and energy efficiency of stratified air distribution systems

机译：分层空气分配系统的热舒适性和能效研究

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A stratified air distribution (STRAD) system is a feasible air conditioning design for large space buildings that satisfies the energy conservation and thermal comfort requirements. In this paper, a novel energy efficiency index for STRAD systems is developed using theoretical analysis to properly evaluate the system's energy saving potential. Using a validated numerical model, two typical stratified air distribution designs in a hypothetical terminal building are evaluated based on thermal comfort and energy savings. The influence of supply and return diffuser distributions on the ventilation performance of these two ventilation designs is studied. When the air is supplied at mid-height, the local thermal comfort is greatly improved without sacrificing the energy efficiency due to additional return grilles located at exterior walls. When the air is supplied at floor level, installing additional return grilles at exterior walls slightly alleviates the local draft risk, but doing so largely impairs the energy saving capacity of the ventilation system. To achieve better thermal comfort and higher energy efficiency, a more uniform distribution of supply diffusers surrounding the occupied zone is suggested. When the air is supplied at the floor level, increases in solar radiation intensity can be mitigated by utilizing external shading designs, which are particularly important in preventing too large of a temperature gradient in the region exposed directly to the solar radiation. (C) 2015 International Energy Initiative. Published by Elsevier Inc. All rights reserved.
机译：分层空气分配（STRAD）系统是满足大型空间建筑的节能和热舒适性要求的可行空调设计。本文通过理论分析，为STRAD系统开发了一种新的能效指标，以正确评估系统的节能潜力。使用经过验证的数值模型，基于热舒适度和节能效果，对假设的候机楼中的两种典型分层空气分配设计进行了评估。研究了进风和回风扩散器分布对这两种通风设计的通风性能的影响。当以中等高度供应空气时，由于位于外墙的附加回风格栅，可大大提高局部热舒适性，而不会牺牲能源效率。当在地板上供应空气时，在外墙上安装额外的回风格栅会稍微减轻局部通风风险，但是这样做会大大削弱通风系统的节能能力。为了获得更好的热舒适性和更高的能源效率，建议在被占用区域周围分布更均匀的供气扩散器。当在地板上供应空气时，可以通过使用外部遮光设计来减轻太阳辐射强度的增加，这对于防止直接暴露于太阳辐射的区域中的温度梯度过大特别重要。 （C）2015年国际能源计划。由Elsevier Inc.出版。保留所有权利。

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