This paper presents the findings of a field research on occupant comfort with radiant ceiling cooling and overhead dedicated outdoor air system (RCF). This extends a previous thermal comfort study with radiant cooling and intended to investigate the actual occupant thermal comfort with radiant ceiling cooling and overhead air distribution system. The research is based on a revised ASHRAE RP-921 project protocol with a combination of field measurements and questionnaires. A total of 135 sets of data from 44 participants were collected in summer. The results show that occupant whole-body thermal sensations with the radiant ceiling and overhead air system had deviated from the PMV model at the 23.6~28.6 °C operative temperature (OPT) range in the summer. The main advantage of the RCF system for thermal comfort was found to be better comfort conditions than with conventional air conditioning at the same operative temperature range. The results of this study showed that the neutral temperature with the RCF is around 26 °C; the preferred temperature by occupants was around 25.3 °C with the RCF. The calculated Predicted Percentage Dissatisfied (PPD) rate is 13.9%, but the actual thermal environment dissatisfaction rate was 8.3% with an unacceptability rate of only 1.5%, which is substantially better than the calculated PPD rate. The study results were compared to earlier findings and validated against some important results, providing benchmarks for future work.

本文介绍了对辐射顶棚冷却和高架专用室外空气系统（RCF）的乘员舒适度的现场研究成果。这扩展了先前使用辐射冷却的热舒适性研究，并旨在研究使用辐射天花板冷却和高架空气分配系统的实际乘员热舒适性。该研究基于修订的ASHRAE RP-921项目协议，结合了现场测量和问卷调查。夏季收集了来自44位参与者的135套数据。结果表明，在夏天，在23.6〜28.6°C的工作温度（OPT）范围内，带有辐射顶棚和高架空气系统的乘员全身热感已经偏离了PMV模型。发现在相同的工作温度范围内，RCF系统​​提供的热舒适性的主要优势是其舒适性要比传统空调好。这项研究的结果表明，使用RCF的中性温度约为26°C。使用RCF时，乘员的首选温度约为25.3°C。计算得出的预测不满意百分比（PPD）率为13.9％，但是实际的热环境不满意率为8.3％，不可接受率仅为1.5％，这明显好于计算PPD率。研究结果与早期发现进行了比较，并针对一些重要结果进行了验证，为将来的工作提供了基准。这项研究的结果表明，使用RCF的中性温度约为26°C。使用RCF时，乘员的首选温度约为25.3°C。计算得出的预测不满意百分比（PPD）率为13.9％，但是实际的热环境不满意率为8.3％，不可接受率仅为1.5％，这明显好于计算PPD率。研究结果与早期发现进行了比较，并针对一些重要结果进行了验证，为将来的工作提供了基准。这项研究的结果表明，使用RCF的中性温度约为26°C。使用RCF时，乘员的首选温度约为25.3°C。计算得出的预测不满意百分比（PPD）率为13.9％，但是实际的热环境不满意率为8.3％，不可接受率仅为1.5％，这明显好于计算PPD率。研究结果与早期发现进行了比较，并针对一些重要结果进行了验证，为将来的工作提供了基准。这比计算出的PPD速率好得多。研究结果与早期发现进行了比较，并针对一些重要结果进行了验证，为将来的工作提供了基准。这比计算出的PPD速率好得多。研究结果与早期发现进行了比较，并针对一些重要结果进行了验证，为将来的工作提供了基准。