Evaluation of Technologies to Reduce Energy and Water Consumption in Popular Housing

This paper proposes evaluates the energy efficiency actions in housing of social interest in the State of Goias - Brazil. The Goiana's Housing Agency did the retrofit of lamps and photovoltaic system in 729 houses some already had solar thermal systems. In this sample three houses were selected to do the measurements monthly consumption of inputs (water and electricity) by the electric or solar thermal shower, considering the average of 4 inhabitants per house. To this comparison was inserted the association of the proposed system of photovoltaic generation. Considering the inputs and the installation cost diluted by the useful life of the equipment. a favorable economic results presents that the solution with the lowest cost per bath is the photovoltaic associated to the electric shower when compared to solar heating. The factors such as the average volume of water used per system, average bath time, equipment life, determined the result. In cases of association of photovoltaic and thermosolar technologies, we conclude that if the total investment is applied only to photovoltaic, the economic result to the resident will be higher.