SF-98-28-4热舒适性和冷空气分配摘要:冷空气分配系统在38华氏度到51华氏度（3摄氏度到11摄氏度）之间提供空气。当冷空气分配系统与冰蓄冷系统结合使用时，通过将需求转移到非高峰时间来减少高峰负荷，这一点越来越有吸引力。它们还需要更少的运营和资本成本，因为它们使用更小的风扇、管道、管道和泵。然而，冷风系统设计和应用中的一个重要问题是对乘员舒适性的影响。 从业人员使用几种技术和方法来评估传统的空气分配系统。其中包括空气扩散性能指数（ADPI）。它在美国被广泛使用，并在1993年ASHRAE手册《基础知识》中被引用。然而，这种技术是基于从传统系统进行的试验中获得的经验相关性，不能保证它们同样适用于冷空气系统。因此，本研究旨在将现有技术（尤其是空气扩散性能指数）扩展到使用冷空气分配系统的应用中。 这项工作提出了一个批判性的审查ADPI技术的发展，并提出了若干建议，为未来的房间空气分布研究奠定坚实的基础。对于这项工作，没有进行新的舒适性测试。然而，Nevins和Miller研究的实验数据被用于将现有的ADPI方法扩展到冷空气系统。Nevins和Miller进行的试验涵盖了不同类型扩散器的各种排放流量和温差。 这些试验条件中有大量可归类为冷空气条件。作为将现有ADPI扩展到冷空气系统的第一步，占用区域内的局部速度与进气射流的总动量相关。这些关联式可用于将ADPI与供气动量直接关联。介绍了一种确定冷空气系统ADPI的方法。在这种方法中，采用一步程序，其中ADPI直接与供气的动量数相关。 给出了一组将ADPI与不同载荷下房间/扩散器组合的动量数关联的曲线。单位:双引文:研讨会，ASHRAE交易，1998年，第104卷，pt。1A，旧金山

SF-98-28-4Thermal Comfort and Cold Air DistributionABSTRACT:Cold air distribution systems supply air at temperatures between 38°F and 51°F (3°C- 11°C). Cold air distribution systems are increasingly attractive when used in conjunction with ice storage systems to shave peak load by shifting the demand to off-peak hours. They also require less operating and capital costs because they use smaller fans, ducts, piping, and pumps. However, an important issue in design and application of cold air systems is the effect on occupant comfort.There are several techniques and methodologies that practitioners use for evaluation of conventional air distribution systems. Among these is the Air Diffusion Performance Index (ADPI). It is widely used in the U.S. and is referenced in the 1993 ASHRAE Handbook--Fundamentals. However, this technique is based on empirical correlations obtained from tests conducted with conventional systems and it cannot be guaranteed that they will be equally applicable to cold air systems. This study was undertaken, therefore, to extend the existing techniques (especially the Air Diffusion Performance Index) to applications where cold air distribution systems are utilized.This work presents a critical review of the evolution of the ADPI technique and offers several recommendations for developing a firm foundation for future room air distribution research. For this work, no new comfort tests were conducted. However, the experimental data of the research conducted by Nevins and Miller were employed for extending the existing ADPI methodology to cold air systems. The tests conducted by Nevins and Miller covered a wide range of discharge flow rates and temperature differences for different types of diffusers. A large number of those test conditions could be categorized as cold air conditions.As a first step in extending the existing ADPI to cold air systems, the local velocities in the occupied zone are correlated to the total momentum of the inlet air jet. These correlations can be used for directly relating the ADPI to the supply air momentum.An approach for determining the ADPI of cold air systems is introduced. In this approach, a one-step procedure is adopted where the ADPI is directly linked to the momentum number of the supply air. A set of curves correlating the ADPI to the momentum number of the room/diffuser combination under different loads are presented.Units: Dual