Analysis of temperature, air humidity and wind conditions for the needs of outdoor thermal comfort

Abstract

On the thermal comfort of a man staying outdoor during the summer affect mostly meteorological factors, physical activity and the type of clothing. The work analyzed external air parameters, such as: temperature, relative humidity and wind speed, occuring in years 1997-2016. Meteorological data recorded at the Rzeszów-Jasionka station allowed to determine, among others, the occurrence of maximum daily and hourly temperatures of outdoor, the daytime and hourly air relative humidity, the hourly wind speed, as well as the relationship between these parameters. In recent years, it has been observed the increase of the number of hot and very hot days which indicates a warming of the climate. The duration of series of days with maximum daily temperature above 30°C is also prolonged, which is not comfortable for a person staying outside. During summer, during hot and very hot days, the average relative humidity remained below 70%. The daily course of this factor was characterized by the opposite tendency with respect to temperature. The wind speed in the summer season varies from 0 to 6 m/s. On a daily basis, the increase in wind speed occurred in the afternoon hours which is consistent with the temperature characteristics. The occurrence of wind during the hottest hours causes a pleasant cooling of the organism.

Outdoor thermal performance simulation in campus area during the dry season, Yogyakarta

“…The wind speed affects outdoor thermal comfort through its function as a cooling effect. The air movement in indoor that can be accepted by the human body does not exceed 0.3 m/s, and in outdoor it does not exceed 1 m/s to 8 m/s [15]. The wind speed in the observation area was 1 m/s to 1.7 m/s during measurement (Fig.…”

Application of Machine Learning to Study Effect of Environmental Manipulation in Frame of Smart Agriculture on the Stomata of Capsicum annuum

“…The higher the light intensity will increase the temperature. Research by [29] also shows that the temperature during the day is higher than at night. The average daily temperature is around 30.65 o C. This temperature is higher than the ideal temperature for red chili plants but not more than 32 o C so that chili plants can still grow well.…”

Comparative study of multiple heat indices in revisiting summer heat across China based on meteorological observations

“…The discomfort index (TDI), proposed by Thom (1959), considers air humidity indirectly via the wet-bulb temperature (Tw) in heat measurement. Moreover, the occurrence of wind during the hottest hour brings pleasant cooling (Dec et al, 2018) and solar radiation can adjust hot conditions through radiative heat transfer (Bedford and Warner, 1933). Therefore, composite indices considering wind and solar radiation have been proposed such as the effective temperature equivalent (TEE) (Teodoreanu, 2016) and the wet bulb global temperature (WBGT) (Yaglou and Minard, 1957).…”