Scientists in China have proposed and realized a new concept—barocaloric thermal batteries based on the unique inverse barocaloric effect. With this they can extract thermal energy from low-temperature waste heat sources and reuse it on demand, simply by controlling the pressure
Heat production accounts for more than 50% of the world’s final energy consumption and analysis of waste heat potential shows that 72% of the world’s primary energy consumption is lost after conversion, mainly in the form of heat. It is also responsible for more than 30% of global greenhouse gas emissions.
An inverse barocaloric effect is characterized by a pressure-induced endothermic response, in sharp contrast to a normal barocaloric effect where pressurization leads to an exothermic response. “A barocaloric thermal battery cycle consists of three steps, including thermal charging upon pressurization, storage with pressure, and thermal discharging upon depressurization,” said Prof. LI, corresponding author of the study.
SCN has been well characterized using synchrotron X-ray and neutron scattering techniques. It undergoes a crystal structural phase transition from a monoclinic to an orthorhombic phase at 363 K, accompanied by a volumetric negative thermal expansion of ~5% and entropy changes of about 128 J kgThis transition is easily driven by pressure as low as 40 MPa, and it is the first inverse barocaloric system with entropy changes greater than 100 J kg.
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