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Office building in Costa Rica

Measuring illuminance, temperature, humidity, and air speed




Illuminance was measured in lumens per m2 using a Hobos system (model H08-004-02) set up in the southern wing. One sensor monitored average light conditions in the building and a second sensor was directed toward the north-facing windows to read during the late afternoon and sunset hours, times when illuminance could become excessive.

Air temperature and relative humidity were monitored at six locations in the building using the same Hobos system. In the north wing, sensors were positioned in the middle of the room and inside an office. In the south wing, two sensors were placed in the middle of the hall and one in the stairway between the ground floor and upper floor. Another sensor was positioned in a shaded corridor on the southern side of the courtyard.

All sensors were programmed to record average values at ten-minute intervals during 24-hour cycles. Readings taken in the stairway were not used in calculations of average values for the building.

Air movement inside the building and wind speed outside the building were measured during times of maximum winds (October 2004 and February 2005). Two pairs of anemometers (MetOne, model 014A) were set up, one on the upper floor of the administration wing (west wing), and the other on the ground floor at the east end of the building.

In each case, one anemometer was positioned inside and the other outside the building. The data was recorded by a data logger (Campbell Scientific model CR10X) programmed to record average and maximum wind speeds at ten-minute intervals during 24-hour cycles.


Shading and ventilation instead of mechanical air conditioning provide a comfortable indoor climate. Three shading mechanisms are visible here: a fabric canopy, vertical sun-blocks, and horizontal louvers.

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