The present paper deals with the thermal study of honeycomb panels for short-term heat storage Using honeycomb panels filled with Phase Change Materials (PCMs) allowed us to fulfil two criteria enhancement of thermal conductivity and containment to avoid possible leaks Paraffin whose thermal properties have been measured has been chosen as PCM The response of the PCM panel to temperature variations was studied with a specific test bench Temperature and flux measurements clearly showed a significant thermal inertia increase compared to samples filled with air and water Modelling and numerical simulation have been carried out and validated with the experimental results (C) 2010 Elsevier B V All rights reserved