**3.1.1 Methodology of the in-situ measurements**

430 Solar Radiation

Slabs, 30x30x3 cm, mosaic, white 39 (+4.5) 22.1 (-6.4) 33 (+1.7) Slabs, 30x30x3 cm, mosaic, yellow 42.6 (+8.1) 22.4 (-6.1) 35.4 (+4.1) Slabs, 30x30x3 cm, mosaic, red 50.4 (+15.9) 23.1 (-5.4) 40.3 (+9) Slabs, 30x30x3 cm, mosaic, grey 54.8 (+20.3) 23.3 (-5.2) 43.2 (+11.9) Slabs, 40x40x3,5 cm, mosaic, white 39.6 (+5.1) 21.6 (-6.9) 32.6 (+1.3) Slabs, 40x40x3,5 cm, mosaic, yellow 43 (+8.5) 21.4 (-7.1) 34.8 (+3.5) Slabs, 40x40x3,5 cm, mosaic, red 46.7 (+12.2) 21.8 (-6.7) 37.1 (+5.8) Slabs, 40x40x3,5 cm, mosaic, grey 52.2 (+17.7) 22.1 (-6.4) 40.8 (+9.5) Slabs, 40x40x3,5 cm, pebbles, white 39.6 (+5.1) 21.7 (-6.8) 32.6 (+1.3) Slabs, 40x40x3,5, pebbles, various 50.2 (+15.7) 22.1 (-6.4) 39.4 (+8.1) Slabs, 40x40x3,5cm, pebbles, grey 51.3 (+16.8) 22.2 (-6.3) 40 (+8.7) Slabs, 40x40x3,5cm, pebbles, grey 53.4 (+18.9) 22.8 (-5.7) 41.4 (+10.1) Slabs, 40x40x3,5cm, pebbles, green 53.7 (+19.2) 22.8 (-5.7) 41.8 (+10.5) Blocks, 20x10x6 cm, white 42 (+7.5) 22.3 (-6.2) 34.7 (+3.4) Blocks, 20x10x6 cm, yellow 43 (+8.5) 22.8 (-5.7) 35.6 (+4.3) Blocks, 20x10x6 cm, red 47.7 (+13.2) 23 (-5.5) 38.8 (+7.5) Blocks, 20x10x6 cm, grey 51.7 (+17.2) 23.1 (-5.4) 41.3 (+10) Blocks, 10x10x6 cm, white 41 (+6.5) 22.3 (-6.2) 33.9 (+2.6) Blocks, 10x10x6 cm, yellow 41.8 (+7.3) 22.8 (-5.7) 34.7 (+3.4) Blocks, 10x10x6 cm, ochre 44 (+9.5) 23.1 (-5.4) 36.2 (+4.9) Blocks, 10x10x6 cm, beige 44.6 (+10.1) 22.8 (-5.7) 36.6 (+5.3) Blocks, 10x10x6 cm, light brown 44.7 (+10.2) 23.1 (-5.4) 36.8 (+5.5) Blocks, 10x10x6 cm, red 46.3 (+11.8) 23.5 (-5) 38.1 (+6.8) Blocks, 10x10x6 cm, grey 46.7 (+12.2) 23.3 (-5.2) 38.2 (+6.9) Blocks, 10x10x6 cm, dark brown 49.6 (+15.1) 23.5 (-5) 40.2 (+8.9) Blocks, 10x10x6 cm, dark grey 49.6 (+15.1) 23.6 (-4.9) 40.3 (+9) **Ceramic blocks** Beige, 3 cm-thick 42.7 (+8.2) 21.8 (-6.7) 35.2 (+3.9) Beige, 5 cm-thick 43.6 (+9.1) 21.9 (-6.6) 35.7 (+4.4) Brown, 5 cm-thick 47.5 (+13.0) 22.4 (-6.1) 37.9 (+6.6) Brown, 3 cm-thick 48.3 (+13.8) 22.8 (-5.7) 38.7 (+7.4) Firebrick, ochre 45.1 (+10.6) 22.7 (-5.8) 36.3 (+5.0) Firebrick,, brown 48.4 (+13.9) 23 (-5.5) 38.2 (+6.9) **Wooden surfaces** Teak 52.9 (+18.4) 22.7 (-5.8) 40.8 (+9.5) Merbau 57.4 (+22.9) 23.3 (-5.2) 43.9 (+12.6) **Asphalt**  Asphalt concrete, old, grey 50.6 (+16.1) 22.5 (-6) 40.3 (+9) Asphalt concrete, new, black 61.7 (+27.2) 23.4 (-5.1) 46.4 (+15.1) Asphalt concrete, new, black 61.9 (+27.4) 23 (-5.5) 47.1 (+15.8) Asphalt membrane, alu cover 46.8 (+12.3) 28.1 (-0.4) 38.7 (+7.4) Asphalt membrane, black 67.2 (+32.7) 21.3 (-7.2) 47 (+15.7) Asphalt membrane, grey light-grain 70 (+35.5) 21.8 (-6.7) 48.7 (+17.4) Asph. membrane, grey heavy-grain 65.5 (+31) 20.7 (-7.8) 45.9 (+14.6) Asphalt membrane, black 72.7 (+38.2) 22.7 (-5.8) 50.3 (+19) **Vegetative cover**  Grass, well-irrigated 39.9 (+5.4) 20 (-8.5) 31.1 (-0.2) Grass, not irrigated 40.4 (+5.9) 20.1 (-8.4) 30.9 (-0.4) Table 2. Overview of the experimental surface temperature measurements on samples of

paving materials.

The choice of the buildings selected for the study was based on a number of criteria, which are summarised below:


The surface temperature readings were taken with an Optex Thermo-Hunter PT-5LD Infrared (IR) thermometer every half-hour, from 8:00 in the morning until 19:30 or 20:00 in the evening. The measurements were limited to a height of not more than 6 meters, due to restrictions posed by the instrument. On each of the facades, IR readings were taken at different heights and at different parts of the facade, in order to ensure that recorded surface temperature was representative. Finally, air temperatures, relative humidity and air velocity were also measured on the site. Indoor air and surface temperature measurements were not possible, as there was no access to the buildings in question. The environmental conditions during the days of the measurements were characterised predominantly by clear skies (0/8), high air temperatures (29.6 oC to 34.4 oC), low relative humidity (28.5 % to 52 %) and various air velocities (0.6 m/s to 3.2 m/s).
