Estimation and Time Analysis of Climatic Comfort in Tabriz Megalopolis

In this Survey, the climatic comfort conditions of Tabriz megalopolis have been examined with regard to the thermal sense of people. The evaluation of the thermal conditions has been made based on the calculations which are based on the human energy balance, and has been made for recognizing lack of comfort against the hot or cold weather for the people walking outdoors with suitable clothing. Hot and cold hours are defined depending on the extent and duration of thermal discomfort against the cold and warm conditions.Major methods used in this study are American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE) standard 55-2004 Predicted Mean Vote (PMV) method and it's put out to Givoni psychometric diagram. This is possible using hourly data for analyzing of monthly, seasonal and total 44 yearly (1961-2004) study period. Achieved results shows that maximum hourly rate of climatic comfort centralizations located in August, July and September months and minimum hourly rate of climatic comfort is in November, December, January, February and March months. From consecutive Distribution of months of the highest climatic comfort point of view, thermal period of April to October to have highest rates of hourly climatic comfort and while November to March period have not climatic comfort hours. From the view point of seasonal distribution of climatic comfort hours, summer with total mean of 989 hours and 64 percent seasonal distribution has allocated itself the most climatic comfort hours of Tabriz, after that, spring with 437 hours has 28 percent of seasonal distribution of hourly climatic comfort. Autumn with 123 hours and 8 percent of the seasonal distribution of hourly climatic comfort is located in next Place and winter has no role in seasonal distribution of hourly climatic comfort in Tabriz and total hours of winter season of Tabriz are discomfort hours.The total mean of climatic comfort hours of Tabriz in Statistical period shows 1549 hours from total 8760 hours that it shows 17.7 percent relation of climatic comfort hours to climatic discomfort hours in Tabriz. This means that in 82.3 percent of cases, for Creating balanced climate with human physiological conditions, energy shall be consumed, which in addition to the Expense, requires professional issues.