Comments on "Introduction of an energy efficiency tool for small scale biomass gasifiers - A thermodynamic approach" (S. Vakalis, F. Patuzzi, M. Baratieri, Energy Conyers. Manage. 131 (2017) 1-9)

The purpose of this discussion is to increase the awareness of the divergent views on the entransy concept among the readers of Energy Conversion and Management. Comments are presented in particular on the paper by Vakalis et al. [1]where the authors used entransy in their analysis. Based on the view points of independent various groups of researchers world wide, I draw the attention of readers to the reality that entransy has no physical meaning. (C) 2017 Elsevier Ltd. All rights reserved.