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ARAÚJO, Eliete de Pinho; Silva, Maria Mônica de Araújo da. Case study-comparison between the system of hot water suplies in residential buildings: Brasília. In: CONFERENCE ON PASSIVE AND LOW ENERGY ARCHITECTURE, 20., 2003, Santiago do Chile. Anais... Santiago do Chile, 2003.
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Abstract

This paper shows a study about two hot water supplies systems in two residential buildings, 880m 2 of built area, located in Brasilia, Brazil. The buildings have 36 apartments, 6 floors, underground, pilotis and mutual covering. Were planned different systems of hot water supplies by a gas boiler in the subsoil, on the first block A, and solar collectors with reservoirs in the covering, on the second block B, has a electrical system of the reservoir of hot water starts if the temperature does not reach the minimum of 55 o C. The consumption of water on the building A is higher than the building B, causing a monthly cost in 50% higher than A. They are different because the boiler installed in the underground of the building A repressed the hot water up to the six floor to distribute to the others, making the water circulate excessively until arrive in the point of consumption. The reservoir installed in the covering on the building B are closer to the point of consumption, making the consumption lower. The consumption of gas in the boiler of the building A is high, causing a high monthly financial cost. This work uses the post occupation evaluation (POA), which consists in a methodology of evaluation by performance of built areas that precedence practical, working and moving aspects and consider essential the point of view users. The user’s opinion were observed by application of questionnaires and interviews. This study is important to plan future architecture’s projects integrated with hot water supplies. The faculties of architecture and engineering and the professionals will be benefited with this study to make use of future. The idea of showing a sustainable architecture resulted in the development of two systems of hot water supplies applied in residential buildings in Brasilia, DF, with purpose to define the best option for the comfort of users, economy of water, gas and energy, to reduce the costs, profit the abundance of solar light that privileges Brasilia and apply the sustainable, using the natural sources. We conclud that utilizing the technology of solar collectors, in Brasilia, can reduce up to 50% of the cost.
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