Table 5.
Weather data for the test periods—minimum, average and maximum values of: external air temperature, relative humidity, solar radiation (diurnal average of solar radiation is from 9 a.m. to 5 p.m.), wind speed, rainfall (higher than 1.0 mm).
| Period | External Environmental Variable | Min | Avg | Max | Days (Prec. > 1.0 mm) | Cumulative Precipitations [mm] |
|---|---|---|---|---|---|---|
| I. 6–10 November 2017 | Air temperature [°C] | 5.8 | 9.3 | 13.3 | - | - |
| Relative humidity [%] | 76.3 | 98.1 | 99.7 | |||
| Solar Radiation [W/m2] | 4.5 | 102.8 | 409.2 | - | - | |
| Wind speed [m/s] | 0.2 | 1.4 | 2.6 | - | - | |
| Rain [mm] | - | - | - | 3/5 | 14.8 | |
| II. 13–17 November 2017 | Air temperature [°C] | −0.1 | 6.2 | 14.3 | - | - |
| Relative humidity [%] | 36.8 | 85.7 | 100.0 | |||
| Solar Radiation [W/m2] | 0.3 | 222.0 | 475.8 | - | - | |
| Wind speed [m/s] | 0.0 | 1.3 | 5.2 | - | - | |
| Rain [mm] | - | - | - | 0/5 | 0.0 | |
| III. 20–24 November 2017 | Air temperature [°C] | 0.6 | 7.2 | 14.3 | - | - |
| Relative humidity [%] | 58.2 | 96.2 | 100.0 | |||
| Solar Radiation [W/m2] | 1.8 | 143.4 | 415.5 | - | - | |
| Wind speed [m/s] | 0.1 | 1.1 | 2.5 | - | - | |
| Rain [mm] | - | - | - | 0/5 | 0.0 | |
| IV. 27–30 November 2017 | Air temperature [°C] | −3.2 | 2.5 | 11.4 | - | - |
| Relative humidity [%] | 25.8 | 88.8 | 99.8 | |||
| Solar Radiation [W/m2] | 0.8 | 172.0 | 459.5 | - | - | |
| Wind speed [m/s] | 0.2 | 1.5 | 3.9 | - | - | |
| Rain [mm] | - | - | - | 1/4 | 1.8 |