In this study, an inorganic mixture based on bischofite (industrial by‐product) was developed and characterized for its application as a phase change material for low‐temperature thermal energy storage. The most appropriate composition was established as 40 wt% bischofite and 60 wt% Mg(NO3)2 · 6H2O. Thermophysical properties were defined and compared with those of the mixture with synthetic MgCl2 · 6H2O. The heat of fusion and melting temperature were measured as 62.0°C and 132.5 kJ kg−1 for the mixture with MgCl2 · 6H2O and 58.2°C and 116.9 kJ kg−1 for the mixture with bischofite. The specific heat capacity values, cycling, and thermal stability for both mixtures were also determined. For the mixture with MgCl2 · 6H2O, the densities of the solid and liquid states were 1517 kg m−3 (ambient temperature) and 1515 kg m−3 (at 60‐70°C), respectively. For the mixture with bischofite, the densities of the solid and liquid states were 1525 kg m−3 (ambient temperature) and 1535 kg m−3 (at 60‐70°C), respectively. Both mixtures show supercooling of about 23.4 and 34.1°C for the mixture with bischofite and MgCl2 · 6H2O, respectively. In addition, it was shown that supercooling may be reduced by increasing the quantity of material tested. Thereby, it was established that an inorganic mixture based on bischofite is a promising PCM for low‐temperature thermal energy storage applications.Funding informationComisión Nacional de InvestigaciónCientífica y Tecnológica, Grant/AwardNumber: CONICYT/FONDAP 15110019,CONICYT‐PCHA/Doctorado Nacional paraEstudiantes Extranjeros 2014/Folio63140052, ERANet‐LAC 2nd Joint Call,ERANET‐LAC 2015‐2016, projectELAC2015/T06‐0988; FONDECYT, Grant/Award Number: 1170675; Spanish Govern-ment, Grant/Award Number: ENE2015‐64117‐C5‐1‐R (MINECO/FEDER); CatalanGovernment, Grant/Award Number: GREA(2014 SGR 123); European CommissionSeventh Framework Programme, Grant/Award Number: PIRSES‐GA‐2013‐610692(INNOSTORAGE); European Union0s Hori-zon, Grant/Award Number: 657466(INPATH‐TES
