Comment on the paper “Temperature dependency of the thermal conductivity of porous heat storage media” by Henok Hailemariam and Frank Wuttke in Heat and Mass Transfer (2018) 54:1031–1051

This comment deals with the proposed accuracy and the interpretation of results of experimental measurements of the temperature dependent thermal conductivity of porous heat storage media carried out by the authors of the original paper. We argue that the described reduction of the thermal conductivity of the specimens is probably mainly an artefact because boundary conditions of the used measurement device have been disregarded. Furthermore, we make some suggestions how to repeat the measurements to gain more proper results.