Practical measurement of thermal microclimate
Monitoring of thermo-hygric microclimate was carried out using the Testo 400, to which tri-functional probe
was attached, three-level globe Vernon-Jokl thermometer, and WBGT set. Used equipment meets ISO 7726
requirements for accuracy. Based on the movement of workers during their work shift, two measuring points were
selected. These most frequent places were then monitored for 6 hours. Along with measuring points, activities of
workers were also analyzed and later served in overall evaluation of the measurement. Because there are two major
sources of radiant heat in operation, variable air speed and people moving freely, environment was evaluated as a
heterogeneous and non-stationary. Therefore it was necessary to perform measurements at three levels: head (1,7
m), abdomen (1,1 m), ankles (0,1 m). Results obtained from two measurement points were put into table and basic
statistic was implied in calculation.
Outside climatic situation of workplace is also a part of the monitoring of thermo-hygric microclimate.
During the measurement there was a sunny day and the outdoor air temperature was between 29 and 34 [°C].
Relative humidity was about 40 [%] and air velocity was about 6 [m.s-1].