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This paper purposes a electronic driving linked to a temperature control strategy aiming to increase the energy efficiency and to improve the power quality issues of a popular refrigerator. In such a case, the net capacity of the refrigerator is lower than 320liters. It was verified that the energy efficiency might be increased using a Fuzzy PI controller. Scaling gains added to input and output variables of the Fuzzy-PI controller improve the temperature dynamic response. The plant model is of first order and encompasses a set of exponential functions that represents the temperature evolution inside the evaporator. A driving system composed of a front-end converter, dc link and inverter changes the motor-compressor frequency. The front-end converter provides power factor correction through a 1 Artigo submetido em 15 de maio de 2008; primeira revisão em 03 de outubro de 2008; segunda revisão em 12 de novembro de 2008. Recomendado para publicação pelos Editores da Seção Especial, João Carlos dos Santos Fagundes e Felix Alberto Farret. controlled voltage doubler with a series inductor. The inverter has two legs and the middle point of the dc link connects the common point of the split-phase motor/compressor. It was verified experimentally that the electricity consumption decreases because of the reduction in the temperature ripple at heat exchangers.

Melhoria Da Eficiência Energética De Refrigeradores Domésticos