“…It is also used in water paints, paper coatings, polishes, and in the ceramic industry, as well as for chromatographic stationary phases. Moreover, PEG has been considered as a promising PCM for solar LHTES applications because of its relatively high latent heat of fusion, congruent melting and freezing behavior, suitable melting temperature range, non‐corrosiveness, non‐toxicity, and non decomposition at its melting/freezing temperature range 1, 2, 12, 13…”