Abstract
Stratum ventilation (SV) can energy-efficiently provide satisfactory thermal comfort under cooling mode. However, thermal comfort and energy efficiency of SV under heating mode can be different from those under cooling mode due to the distinct airflow patterns. In this study, thermal comfort and energy utilization efficiency of SV were investigated for six cases under heating mode. Air velocity and temperature were measured in the occupied zone of a multi-occupant room with dimensions of 8.4 m (L) ×5.4 m (W) ×2.6 m (H). Based on the measured air velocity and temperature, the thermal comfort indicators including vertical air temperature between head and ankle levels (ΔT), draught rate (DR), predicted mean vote (PMV) and energy utilization efficiency were calculated. The results showed that the energy utilization efficiency of SV was higher than one under heating mode, indicating energy saving. The draught rate under SV satisfied the requirement of Category B of thermal environments stipulated in ISO 7730. The PMV of SV can meet the acceptable range for general thermal comfort under the cases with suitably high supply air temperature according to ASHRAE 55-2017. The vertical air temperature difference between head and ankle levels can achieve acceptable results for SV under heating mode.
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