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Figure 10: Indoor maximum and outdoor temperatures with radiant cooling.

Figure 10 Indoor maximum and outdoor temperatures with radiant cooling.

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Figure 1: Experimental and Reference test cells. This study is based on measurements carried out in an experimental platform composed of two test cells designed to evaluate the thermal performance of passive cooling systems (Fig. 1). The test cells are theoretically identical. Only the roof is different. Both have an interior surface of 9m* (3m x 3m) and a height of 2.45 m. They have features typical of a local construction. Their structure, in reinforced concrete (beams, columns and flooring), and their partitions in hollow bricks of 0,15 cm. of thickness, covered of mortar of sand and cement on the two faces, represent the traditional building characteristics. The cells constructive plans and_ thermo-physical properties of materials are described in [2]. The global transmittance (UAg) of the reference cell was experimentally determined and his value is 73.6 W/K.
Figure 1: Experimental and Reference test cells. This study is based on measurements carried out in an experimental platform composed of two test cells designed to evaluate the thermal performance of passive cooling systems (Fig. 1). The test cells are theoretically identical. Only the roof is different. Both have an interior surface of 9m* (3m x 3m) and a height of 2.45 m. They have features typical of a local construction. Their structure, in reinforced concrete (beams, columns and flooring), and their partitions in hollow bricks of 0,15 cm. of thickness, covered of mortar of sand and cement on the two faces, represent the traditional building characteristics. The cells constructive plans and_ thermo-physical properties of materials are described in [2]. The global transmittance (UAg) of the reference cell was experimentally determined and his value is 73.6 W/K.
Figure 3: Outdoor and indoor test cells temperatures cooled by the Radiative/Evaporative system during January 14-17, 1997.
Figure 3: Outdoor and indoor test cells temperatures cooled by the Radiative/Evaporative system during January 14-17, 1997.
Figure 6: daily changes on Indoor maximum temperature related to outdoor average changes. Close inspection of the relationship between the indoor maximum and the outdoor average in figure 5 shows that the average elevation of the indoor maximum above the outdoor average is 1.8 K. It can also be observed that the daily changes in the indoor maximum are smaller that the daily changes in the outdoor average. To quantify this relationship the daily changes in the indoor maximum were expressed as a function of the daily changes of the outdoor average; as can be seen in figure 6.
Figure 6: daily changes on Indoor maximum temperature related to outdoor average changes. Close inspection of the relationship between the indoor maximum and the outdoor average in figure 5 shows that the average elevation of the indoor maximum above the outdoor average is 1.8 K. It can also be observed that the daily changes in the indoor maximum are smaller that the daily changes in the outdoor average. To quantify this relationship the daily changes in the indoor maximum were expressed as a function of the daily changes of the outdoor average; as can be seen in figure 6.
The differences between the measured and the computed (by the initial formula) indoor maximums (Deviations) were expressed as a function of the night temperature drop, TD, as is seen in figure 7.
The differences between the measured and the computed (by the initial formula) indoor maximums (Deviations) were expressed as a function of the night temperature drop, TD, as is seen in figure 7.
Figure 8: Measured and computed indoor maximum temperatures with radiant cooling. Figure 8 shows the measured and the computed indoor maximum temperatures over the background of the outdoor maximums and minimums.
Figure 8: Measured and computed indoor maximum temperatures with radiant cooling. Figure 8 shows the measured and the computed indoor maximum temperatures over the background of the outdoor maximums and minimums.
Figure 9: Measured and computed indoor maximum, average and minimum temperatures. Cell cooled by nocturnal radiation. Figure 9 shows the measured and the computed indoor maximum, average and minimum temperatures, of the cell cooled by _ nocturnal radiation, over the background of the outdoor maximum and minimum.
Figure 9: Measured and computed indoor maximum, average and minimum temperatures. Cell cooled by nocturnal radiation. Figure 9 shows the measured and the computed indoor maximum, average and minimum temperatures, of the cell cooled by _ nocturnal radiation, over the background of the outdoor maximum and minimum.
Although some elevation of the indoor temperature occurs with higher humidity ratio the R2 value is very small (0.066). Thus the direct effect seems to be insignificant.
Although some elevation of the indoor temperature occurs with higher humidity ratio the R2 value is very small (0.066). Thus the direct effect seems to be insignificant.
Figure 12: Measured and the computed indoor maximum temperatures with Radiant/Evaporative cooing. This effect is shown in figure 13. No such effect was evident from the data. CONCLUSION Plea2004 - The 21" Conference on Passive and Low Energy Architecture. Eindhoven, The Netherlands, 19 - 22 September 2004 Page 6 of 6
Figure 12: Measured and the computed indoor maximum temperatures with Radiant/Evaporative cooing. This effect is shown in figure 13. No such effect was evident from the data. CONCLUSION Plea2004 - The 21" Conference on Passive and Low Energy Architecture. Eindhoven, The Netherlands, 19 - 22 September 2004 Page 6 of 6
Se ec developed also for the indoor average and the indoor minimum temperatures:
Se ec developed also for the indoor average and the indoor minimum temperatures:
The experiments discussed in this paper have demonstrated that even under the very humid climate of Maracaibo there is a potential for passive cooling of buildings.
The experiments discussed in this paper have demonstrated that even under the very humid climate of Maracaibo there is a potential for passive cooling of buildings.
Related topics:
GeographyEnvironmental ScienceRadiative Cooling
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