Análise da influência de um sistema de agitação vertical no tempo de aquecimento de água de um reservatório em aço inox

Abstract

Mixing systems are widely used in industry due to their different constructive variations and application versatility, which range from mixing homogenization to avoiding solidification of the stored liquid. This work aims to evaluate the behavior of water temperature over time when subjected to the action of an impeller, comparing theoretical and practical results. The experimental results were extracted through the construction of a real-scale equipment, adapting an existing tank to have the necessary characteristics for the study. Analytically, the classical heat transfer equations were combined in an electronic spreadsheet with the same input data present in the experiment, such as diameter, volume and materials. Theoretically, the heating time results converged with the practical values obtained and the relevant coefficients for heat transfer increased proportionally to the intensity created by the mixer in the stored fluid. Experimentally, for the conditions proposed in this study, using the mixing system presented greater time values as higher was the rotation speed. Therefore, it is believed that the low rotation speed applied boosted the loss of thermal energy, contradicting results found by other authors who used higher speeds and obtained gains in thermal efficiency. [resumo fornecido pelo autor]