ESTIMATION OF THERMAL ENVIRONMENT IN A ROOM WITH CROSS-VENTILATION BY PMV (PREDICTED MEAN VOTE)

This paper aims at estimating thermal environment in a room with cross-ventilation by PMV from outdoor climatic conditions. First, thermal effect of cross-ventilation is shown by comparing cumulative frequency distributions of PMV of the dwelling units with windows opened and closed for three ranges of outdoor air temperature. Second, high correlations are seen between outdoor and indoor air temperatures, outdoor and indoor relative humidities, wind speed and indoor air flow velocities, and indoor air and globe temperatures. Third, PMV's are estimated from outdoor climatic factors by using these relations. They get good agreement with PMV's calculated from air and globe temperatures, relative humidity and air flow velocity all measured indoors. Finally, PMV charts with parameters of outdoor air temperature, relative humidity and wind speed are proposed for various metabolic rates and clothing conditions. By these charts one can estimate PMV in a room with crossventilation for any outdoor conditions.