عنوان مقاله [English]
Inappropriate weather conditions such as severe hot or cold weather will affect both the body and the soul of every man and as a result his effectiveness and efficiency will be distorted. On the contrary, thermal comfort conditions will result in optimal conditions. The present study analyzed Physiological Equivalent Temperature (PET) and Predicted Mean View (PMV) from among the parameters of an average period of sixty years (1955-2015) in Hamdid station of Sabzevar. The parameters included temperature, average, the lowest temperature in a day, the average of the highest temperature in a day, dry weather temperature, steam pressure by Hectopascal, relative humidity, wind speed, and the cloudiness of the weather have been used. The results of this study showed that the period of thermal comfort in Sabzevar is very limited so that the period reaches its climax in autumn and spring from 35 to 40 days. However the hot weather lasts for 50 days from Tir to around the 20th of Mordad. The most important factor in Sabzevar as far as thermal comfort is regarded is the long and stressful cold period which lasts for about 190 days from the third decade of autumn to the second decade of Farvardin.