本文采用计算流体力学（CFD）方法研究了采用三种不同类型扩散器的冷空气分配系统提供的室内环境，即方形多锥型、壁挂式喷嘴型和天花板喷嘴型。利用CFD结果和一个简单的冷凝模型，讨论了扩散器表面冷凝的风险。提出了一种新颖的方案，以防止在使用带有冷空气的多锥形圆形扩散器时出现表面冷凝和冷空气倾泻。结果表明，与冷空气分配系统相比，使用传统冷风系统的占用区域的温度分布、气流模式、平均空气龄和平均二氧化碳浓度没有显著变化。 天花板喷嘴式扩散器适用于冷空气分配系统。壁装式喷嘴式扩散器由于逆流而很快失去射流动量，因此，它们的冷却区域范围非常有限。随着供给流量的增加，扩散器表面冷凝的风险增加。多锥扩压器唇口对气流扩散的影响非常显著。单元:双引文:研讨会，ASHRAE交易，第105卷，第。1.

This paper presents a computational fluid dynamics (CFD) study of the indoor environment provided by a cold air distribution system using three alternative types of diffusers, i.e., a square multi-cone type, a wall-mounted nozzle type, and a ceiling nozzle type. The surface condensation risk on the diffusers is also discussed using the CFD results and a simple condensation model. An innovative proposal to prevent surface condensation and cold air dumping when using multi-cone circular diffusers with cold air is presented. The results show no significant variation in temperature distribution, airflow patterns, mean age of air, and mean carbon dioxide concentration at the occupied zone using a conventional chilled air system compared with a cold air distribution system. The ceiling nozzle type diffusers are suitable for cold air distribution systems. The wall-mounted nozzle type diffusers lose their jet momentum very fast because of reversed flow, and, therefore, they have a very limited range of cooling areas. The risk of surface condensation on the diffuser increases as the supply flow rate increases. The influence of the multi-cone diffuser lips on airflow diffusion is very significant.Units: Dual