Abstract
This study evaluates the results of efficiency and consumption tests on gas household appliances and their influence on the classification of the Brazilian Labeling Program. Historically, based on results in interlaboratory comparisons, there is a doubt concerning if the algorithms correct properly the differences among different altitudes. Data from efficiency and consumption tests were collected in two cities with different altitudes, and the proposed calculation methodology is compared with the traditional one. The results show that the arithmetic average, used in the calculation of the efficiency of the burners on the stove table, justifies being replaced by the weighted average, after evaluating the behaviour of the data and treating outliers. The uncertainty of the efficiency and consumption tests was not enough to change the classification range of the product's energy efficiency label. It is concluded that statistically a difference is observed between the results at sea level and at altitude above sea level; since the tests were applied by the same operator using the same apparatus, the only parameter that leaves a doubt is the algorithms for the correction of the altitude. Shortly, this study will be part of a revised Brazilian standard.
Highlights
Brazil, following the example of developed countries, has been making a great effort in the implementation of product certification and labeling programs, mainly for those that have popular use and that bring some risk to the user
Products linked to the use of fuels such as alcohol containers for domestic use, canisters of liquefied petroleum gas (LPG) and cylinders of natural gas (CNG), due to their high degree of risk of accidents, were prioritized in the certification programs
The study concluded that a change in fuel gas supply pressure could compensate for the energy loss that is produced with increasing altitude, that thermal performance increases as altitude increases, and that emissions increase by decreasing oxygen in atmospheric air at a higher altitude when compared to sea level
Summary
Brazil, following the example of developed countries, has been making a great effort in the implementation of product certification and labeling programs, mainly for those that have popular use and that bring some risk to the user. The labeling program for domestic gas cooking appliances, using more efficient stoves and ovens, aims. The labeling of gas stoves and ovens is mandatory and the Brazilian Energy Conservation Label À ENCE provides information on the Power, efficiency, consumption and internal volume of the oven The standardization of this information allows a better evaluation and power of choice for the consumer, providing a natural process of incentive to manufacturers for technological improvement resulting in increased efficiency, operational safety and reduced cost of sale. Aim of this study is to metrologically evaluate the results of the performance and consumption tests on domestic gas cooking appliances and their influence on the PBE classification, based on the statistical treatments of the data obtained in these tests
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