Abstract

The impinging jet ventilation (IJV) system has been proposed as a new air distribution strategy and is expected to overcome the disadvantages of mixing ventilation (MV) system, which is the most widely used system, and displacement ventilation (DV), which provides better air quality than MV. The aim of this study is to accumulate the fundamental feature of IJV and to propose a simple method to predict the indoor environment with IJV. Full-scale experiments were conducted in a climate chamber, in order to investigate the features of IJV. Different ventilation systems and supply air conditions were investigated along with indoor thermal environments, and ventilation effectiveness. For IJV, the indoor environment was similar to that of DV with small supply momentum, and was similar to that of MV with large supply momentum. The specific Archimedes number, which can be calculated by design conditions, was defined to express the balance between the supply momentum and buoyancy force. The correlation between the Archimedes number and indices for thermal environment and ventilation effectiveness are finally shown as prediction method.

摘要

冲击射流通风 (IJV) 系统已被提出作为一种新的空气分配策略，有望克服使用最广泛的混合通风 (MV) 系统和提供更好的置换通风 (DV) 系统的缺点。空气质量比MV。本研究的目的是积累 IJV 的基本特征，并提出一种简单的方法来预测 IJV 的室内环境。为了研究 IJV 的特征，在气候室中进行了全面的实验。研究了不同的通风系统和送风条件以及室内热环境和通风效果。对于IJV，室内环境与供给动力较小的DV相似，与供给动力较大的MV相似。具体的阿基米德数，可以通过设计条件计算，被定义为表示供应动量和浮力之间的平衡。阿基米德数与热环境和通风效率指数之间的相关性最终被显示为预测方法。