## 3 Case Study: AURA Project
### Housing Scale--Conditioning Strategies  
Having analyzed the climate of Santiago de Cali, characterized by high temperatures in certain times of the day, high humidity, torrential rain likelihood, and a breeze at sunset, the team responsible for carrying out the AURA 1.0 Project understood that in order to reach the comfort levels that the event organizers had set as a target, both passive and active conditioning strategies would have to be implemented [43]. It was understood that the inclusion of an air conditioning in the design, fed with the energy generated by the house through the photovoltaic solar installation on the roof of the prototype, would be necessary to counteract both the maximum temperature peaks and the high relative humidity of the place (Figure 14). In addition, two ceiling fans were installed to encourage air movement inside the house. It is therefore important to emphasize that among the minimum equipment required to provide social housing, in this case in a tropical climate, with minimum living conditions, there are the air conditioning. Most of the regulations on social housing in different countries detail minimum construction qualities or the size of the spaces. However, in order to guarantee the health of the inhabitant, it is necessary to provide the housing with active air conditioning systems wherever the climatic conditions do not allow maintaining optimum comfort conditions continuously over time. Figure 14: Scheme about generation and energy consumption. Figure 13: Photo of the entrance hall and access to the prototype. On the other hand, a series of passive conditioning strategies are implemented, which would contribute both to hygrothermal comfort and a reduction in energy consumption by the refrigeration equipment:  
* Ventilated facade--South elevation  
An outer skin was designed for the south elevation of the collective building, so that it would contribute to unifying the image of the proposal and guarantee the safety of the users-inhabitants during the self-construction phase in which not all the plots of the three-dimensional mesh (collective building) would be occupied at the same time. This would provide a certain guarantee of safety, playing the role of a skin on the building, so that the common areas can be used effectively and guaranteeing the safe self-construction of each home (Figure 15). This outer skin is light and permeable, designed with wild cane framed (Arundodonax) in a wooden perimeter, it works as a filter absorbing direct sunlight, but allowing air to pass through, besides being an answer to the important problem of dust in the city breeze. The orientation of the wild cane is horizontal and the exterior carpentry elements are integrated into the established modulation. This envelope is supported by a modulated and visible metal structure of metal profiles, which form both the ventilated facade and the roof of the building. These profiles of the envelope generate an asymmetric sloping roof, which provides the necessary slope to drain the water in episodes of heavy rain (Figure 16). * Enclosures with low thermal inertia  
Given the climate of Santiago de Cali, the absence of thermal inertia in the enclosure panels was chosen, since it was understood that this would be counterproductive in maintaining optimal thermal conditions inside the prototype (Figure 17). Figure 16: Photo of the north-east facade. Figure 15: Photo of the south-east facade. * Solar chimney  
Taking advantage of the solar radiation of the place where the event was held, a solar chimney was installed, which helped to evacuate the warmer air from inside the house, thus favoring both air movement and air renewal. * Sunlight Reflector  
Using a solar reflector, included in the structure of the ventilated facade, the sunlight is directed towards the interior of the house, bouncing it off the roof and thus achieving optimum diffused lighting. The warm colors used in the ceiling and interior walls also contribute to this (Figure 18). Figure 17: Exterior facade without thermal inertia.