Resumo

SANCHEZ ESCALONA, Andres Adrian  e  GONGORA LEYVA, Ever. Determination of the overall heat transfer coefficients comparing the LMTD and ε-NTU methods. Energética [online]. 2018, vol.39, n.3, pp. 203-212. ISSN 1815-5901.

Thermal energy transfer processes are important problems to be solved within the engineering field. In this respect, the heat exchangers are one of the industry most-used equipment. Current research was carried out in an online system of hydrogen sulphide gas coolers, in order to determine the overall heat transfer coefficients by two methods, applying the passive experimentation procedure. Values calculated by means of the Logarithmic Mean Temperature Difference (LMTD) method vary between 11,1 and 73,3 W/(m²·K) , as compared to 11,0 and 58,9 W/(m²·K) when applying the Effectiveness-Number of Transfer Units (ε-NTU) method. Although similar results were obtained, it was recommended to use the LMTD approach for thermal evaluation of studied coolers system, which is used by most researchers

Palavras-chave : heat exchanger; hydrogen sulphide; overall heat transfer coefficient; LMTD; ε-NTU.

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