Avaliação da influência da luz natural na redução do consumo de energia em edifícios comerciais : uma análise em Maceió-AL.

Abstract

Daylight is renewable energy and abundant source. When used to balance the entrance of daylight and heat load within the room, brings benefits as the reduction in energy consumption. In commercial buildings lighting and air conditioning are responsible for larger proportion of final energy consumption. These buildings have great potential to reduce this consumption through balanced daylighting and air conditioning, avoiding waste. To find this balance, the computational simulation programs have been presented as a good alternative to estimate the consumption of an integrated way. This study aimed to evaluate the influence of daylighting in reducing the consumption of electric energy, whereas also, the use of air conditioning for models based on commercial buildings in Maceió. For this evaluation three models of different proportions, with a focus on depth and two sizes of different apertures were simulated in programs EnergyPlus and TropLux. In a first stage illuminances useful generated by computational simulations were evaluated where also the laminated reflective glass was used. In a second stage, the consumptions of daylighting and air conditioning were simulated integrated, considering a system of artificial lighting control. According to the analyzes were observed the illuminances useful are found in higher concentration in models with larger apertures, with lower depth and in points located closer to apertures. In the simulation integrated, the highest percentages of economy vary according to the PJFs, being considerable influence of heat load generated by the system of artificial lighting. Therefore, in the face of the cases studied, natural lighting can contribute significantly to reduce the consumption of electric energy, being important the existence of instruments which indicate guidelines for the use of daylighting in commercial buildings.