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Investigations on the Energy Efficiency of Stratified Air Distribution Systems with Different Diffuser Layouts

机译：不同扩散器布局的分层空气分配系统的能效研究

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This paper investigated the influence of diffuser layouts on the energy performance of stratified air distribution systems (STRAD). The energy saving potentials of STRAD systems are theoretically analyzed. The cooling coil load of a STRAD system is proportion to the return air temperature, while inversely proportional to the exhaust air temperature. Based on that, numerical studies are conducted for the applications of STRAD systems in three typical building space types. Two evaluation indices are developed to assess the energy performance of STRAD systems. The simulation results demonstrated that further energy saving could be achieved by keeping the exhaust grille at ceiling level and decreasing the height of return grille. Therefore, in order to optimize the energy saving capacity of STRAD systems, the return grille is recommended to be located as low as possible, whilst paying special attention on the “short-circuit” of cold supply air. Furthermore, when the STRAD system is applied in large space buildings with a big horizontal span, supply diffusers should be distributed surrounding the occupied zone as uniformly as possible, while avoiding installing return diffusers at exterior walls.
机译：本文研究了扩散器布局对分层空气分配系统（STRAD）能量性能的影响。从理论上分析了STRAD系统的节能潜力。 STRAD系统的冷却盘管负载与回风温度成正比，而与排气温度成反比。在此基础上，针对STRAD系统在三种典型建筑空间类型中的应用进行了数值研究。开发了两个评估指标来评估STRAD系统的能源性能。仿真结果表明，通过将排气格栅保持在天花板水平并降低回风格栅的高度，可以进一步节省能源。因此，为了优化STRAD系统的节能能力，建议将回风格栅放置在尽可能低的位置，同时要特别注意冷空气的“短路”。此外，当STRAD系统应用于水平跨度较大的大型空间建筑物中时，应将供气扩散器尽可能均匀地分布在居住区周围，同时避免在外墙安装回流扩散器。

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