Fig. 4From: A New Phase Change Material Based on Potassium Nitrate with Silica and Alumina Nanoparticles for Thermal Energy StorageStored heat and ratio of energy storage versus temperature. Stored heat of KNO3 and the nanofluids with 1.0 wt.% of oxide nanoparticles (a); ratio of energy storage (total gain %) versus temperature calculated respect to KNO3 (b)Back to article page