Evaluation of the efficiency energy of wood stove from Irati Brazilian city.

This study aimed to evaluate the energy efficiency, thermal power and amount of volatiles released (CO2, CO and SO2) by three models of wood-metallic cookstoves into single-family residences in the city of Irati / PR, Brazil. All cookstoves had a low average energy efficiency fro m 2.9% ± 0.3 (stove 1), 2.6% ± 0.5 (stove 2) to 4.6% ± 0.2 (stove 3). The thermal power was 159.3 W ± 14.2 (stove 1), 142.7 W ± 39.2 (stove 2) and 176.5 W ± 21.7 (stove 3). It was observed a high pollutant levels of volatile compounds such as CO 34,9 Nm 3 /kg ± 3,1; 35,2 Nm 3 /kg ± 8,6 and 24,5 Nm 3 /kg ± 2,1; CO2 314,4 Nm 3 /kg ± 28,3; 316,5 Nm 3 /kg ± 77,0 and 220,9 Nm 3 / kg ± 19,0, lastly SO2 0,027 Nm 3 /kg ±0,0; 0,027 Nm 3 /kg ± 0,0 and 0,019 Nm 3 /kg ± 0,0, respectively fro m first to third stove. The results of the analysis of variance showed that the stove 3 showed to be the most efficient among the models investigated. In general, the obtained data indicate a low energy conversion and a potential health risk to the user due the release of to xic gases, such as carbon mono xide, present in the smo ke inside the house's kitchen.