摘要：SummaryThermal fluids are used as heat transfer fluids and thermal energy storage media in many energy technologies ranging from solar thermal heating to battery thermal management. The heat capacity of state-of-the-art thermal fluids remains ∼50% of that of water (which suffers from a limited operation range between 0°C and 100°C), and their viscosities are typically more than one order of magnitude higher than that of water. Our results demonstrate that the heat capacity of the proposed thermochemical fluid is significantly higher than that of state-of-the-art thermal fluids over a broad temperature range and is also higher than that of water between 60°C and 90°C. The viscosity of our liquid is only 3 times higher than that of water, and the operating temperature range is between −90°C and 135°C. Furthermore, a model was developed allowing for novel design of thermochemical thermal fluids in the future with even higher heat capacity.Graphical abstractDisplay OmittedHighlights•Novel thermal fluid using dissolved reactants for enhanced heat capacity•Exceeds the heat capacity of water between 60°C and 90°C•Thermal window between −90°C and 135°C and viscosity only 3x that of water•Molecular model inputs forCpmatches well with experimental dataThermal design; Energy engineering; Thermal engineering; Thermal property
