Comments on “Frequency correlated heat transfer characteristics of parallel plate active magnetocaloric regenerator”

The purpose of this discussion is to alert the readers of International Journal of Refrigeration that the original sources have not been credited. Comments are presented on the study by Yuan et al. (2019), where the authors used synergy 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 synergy is not original. The original was ‘heatlines’. This is well known, very clear, and should have been stated.