Comfortable air speeds for young people lying at rest in the hot-humid area of China in summer

The results confirmed that human thermal comfort could be maintained at air temperatures of 27-30 °C and humidity of 40%-80% when lying at rest in the hot-humid area of China. The air speeds that were required to maintain various thermal sensations changed linearly with room air temperatures. A higher air speed was needed to maintain the same thermal sensation at a higher air temperature or relative humidity (RH). The air speeds for thermal neutrality were between 0.25 m/s (at 27 °C and 40%-60% RH) and 1.17 m/s (at 30 °C and 60%-80% RH) and between 0.12 m/s and 1.31 m/s to achieve 80% percentages acceptable for thermal, airflow and humidity environments. The neutral air speeds for people lying at rest were 0-0.8 m/s lower than those for people engaged in sedentary activities. The results are beneficial for creating comfortable thermal environments for short rest, pre-sleep and sleep and are applicable for healthy young people living in hot-humid areas.