Investigating the role of cover plants (grass) in improving the physiological equivalent temperature and relative humidity (study area: Tabriz University Stadium)

The aim of this research is to investigate the effects of cover plants (grass) in improving the microclimate.Data collection methods include field analytical, and quantitative, with a comparative analysis method of proposed design options using simulation in ENVI-met software (4.4.6) and Ray-Man 3.1 in two different patterns at the same site for a period of 8 hours (10:00 to 18:00), which took place on June 30, 2020, as the hottest day of the year; The research was also validated by comparing the model's output parameter values with field measurements. The results indicate the optimal performance of the pattern of green cover(grass) compared to the absence of it in improving thermal comfort and reducing physiological temperature. Because it has caused an increase in relative humidity of 0.06% and a decrease in the environmental comfort index (PMV) by 0.005, as well as a decrease in the physiological equivalent temperature (PET) by 0.23 degrees Celsius, the hours of 11:00, 12:00, and 18:00 contain the best performance of vegetation (grass) in terms of enhancing micro-climate conditions, whereas the hours of 14:00, 15:00, and 16:00 include the worst performance in terms of effective micro-climate alterations. The average change in physiological temperature in the most optimal and worst hours of operation is equal to 4.68 degrees Celsius, and these changes in the relative humidity index are equal to 0.45%.