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2 results about "Thermal effusivity" patented technology
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In thermodynamics, the thermal effusivity or thermal responsivity of a material is defined as the square root of the product of the material's thermal conductivity and its volumetric heat capacity. e=(λρcₚ)¹/² Here, λ is the thermal conductivity, ρ is the density and cₚ is the specific heat capacity. The product of ρ and cₚ is known as the volumetric heat capacity. A material's thermal effusivity is a measure of its ability to exchange thermal energy with its surroundings.
A steel slag-based solid thermal storage material and its preparation method
This invention discloses a steel slag-based solid thermal energy storage material and its preparation method, relating to the field of solid thermal energy storage technology. The preparation method includes: pretreating steel slag; placing the pretreated steel slag in a reducing atmosphere; heating it to the reduction temperature and holding it at that temperature for a period of time; then naturally cooling it; mixing the modified steel slag with multiple particle sizes; sequentially pressing and molding the compounded steel slag; and finally, cooling it to obtain the steel slag-based solid thermal energy storage material. This integrated design, which allows the steel slag to possess both good electrical conductivity and thermal storage properties, and allows heat to be generated and stored directly within the thermal energy storage material, eliminates the heat transfer link from the heating element to the heat storage body in traditional solid thermal energy storage methods, avoiding energy efficiency losses caused by temperature gradients and interfacial thermal resistance. Furthermore, the integrated heating and thermal storage module units can be flexibly combined in series and parallel to construct thermal energy storage systems with a full power range of 10 kW to 100 MW.
Owner:JIANGSU JINHE ENERGY TECH CO LTD
An evaluation method, device and equipment for heat storage efficiency of an enclosure and a storage medium
The present application relates to the field of building thermal technology, solves the problem that the existing technology is not accurate, not complete, and poor in environmental adaptability for evaluating the heat storage performance of the envelope structure, and provides an envelope structure heat storage efficiency evaluation method, device, equipment and storage medium, a target test piece containing a functional material is prepared; a cross-characteristic change temperature interval experiment is carried out by using a dynamic thermal and humid climate wind tunnel, nonlinear thermal response data is obtained; a discrete numerical model of enthalpy method is constructed, parameter inversion is carried out with the minimum root mean square error of the theoretical surface heat flow and the measured heat flow as the target, and the thermal physical property parameters and the effective specific heat capacity curve are obtained; a thermal network model is constructed based on the inversion parameters, the hourly heat flow of each node of the test piece is simulated, and the multi-dimensional heat storage efficiency evaluation index of the envelope structure is calculated. The present application couples high-precision wind tunnel experiment, nonlinear heat transfer model and inversion algorithm, accurately quantifies the dynamic heat storage performance of the envelope structure, and provides a precise and practical solution for the heat storage efficiency evaluation of functional envelope structure.
Owner:SOUTH CHINA UNIV OF TECH