Comments on “Analysis and application of a novel three-dimensional energy-saving and emission-reduction dynamic evolution system” [Energy 40 (2012) 291-299]

▸ In the referenced paper an energy-saving and emission-reduction system is considered. ▸ The authors claim to have demonstrated the presence of chaos. ▸ A Šilnikov homoclinic orbit is studied. ▸ Undetermined coefficient method is used. ▸ Crucial flaws in their analysis are pointed out.