8 results about "Thermal effusivity" patented technology

The invention relates to the technical field of building thermal engineering, solves the problems of inaccurate and incomplete evaluation of the heat storage performance of a building envelope and poor environmental adaptability in the prior art, and provides a method, a device and equipment for evaluating the heat storage efficiency of the building envelope and a storage medium to prepare a target test piece containing a functional material; carrying out a cross-characteristic change temperature interval experiment by utilizing the dynamic thermal and humid climate wind tunnel to obtain nonlinear thermal response data; constructing an enthalpy method discrete numerical model, and performing parameter inversion by taking the minimum root-mean-square error of theoretical surface heat flow and actually measured heat flow as a target to obtain thermophysical parameters and an effective specific heat capacity curve; and constructing a thermal network model based on the inversion parameters, and simulating hourly heat flow of each node of the test piece, so as to calculate a multi-dimensional heat storage efficiency evaluation index of the enclosure structure. According to the method, the high-precision wind tunnel experiment, the nonlinear heat transfer model and the inversion algorithm are coupled, the dynamic heat storage performance of the enclosure structure is accurately quantified, and an accurate and practical solution is provided for evaluating the heat storage efficiency of the functional enclosure structure.

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.

The invention discloses a modular skid-mounted heat storage and release integrated fused salt energy storage device which comprises a fused salt box, and a fused salt steam generator is installed on the side wall of one end of the fused salt box in a tightly attached mode. A plurality of rows of vertically-arranged fused salt electric heating pipes are evenly installed in the fused salt box in the length direction of the fused salt box at intervals, a vertical baffle plate is arranged between every two adjacent rows of fused salt electric heating pipes, and a fused salt inlet pipe communicated with an outlet of the fused salt steam generator is installed on the lower portion of the end, close to the fused salt steam generator, of the fused salt box. A fused salt pump is installed at the end, away from the fused salt inlet pipe, in the fused salt box, and the discharging end of the fused salt pump communicates with an inlet of the fused salt steam generator through a fused salt outlet pipe. Modular design and skid-mounted installation are adopted, factory prefabrication and vehicle transportation are facilitated, under the condition that stable heat storage performance and heat release performance are guaranteed, the construction cost and the maintenance cost are greatly reduced, the construction difficulty is reduced, and the system is suitable for being used in small and medium-sized energy storage systems.

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.

An overmoulding method for making a part (1) with a decoration (2) made of a metal alloy (8) that is at least partially amorphous. The method includes: providing an ébauche (3) with at least one through hole (4) opening onto the overmould (2) to be made, the ébauche (3) being made of a first material with low thermal effusivity; positioning the ébauche (3) inside an injection mould (6); injecting the liquid metal alloy (8) through the through-hole (4) opening into a cavity of the injection mould (6) and / or of the ébauche (3); and moulding the ébauche (3) with the overmould (2) to obtain the part (1).

A polyarylene sulfide (PAS) foam layer that circumscribes a hollow inner tube and may have a 50% or greater density reduction relative to the density of an un-foamed PAS polymer material and / or a 50% or greater thermal conductivity reduction relative to the thermal conductivity of an un-foamed PAS polymer material and / or 50% or greater thermal effusivity reduction relative to the thermal effusivity of an un-foamed PAS polymer material. The PAS foam layer may have a low density (e.g., less than 0.67 g / cc) and / or a low thermal conductivity (e.g., anywhere from 0.017 W / (m-K) to 0.145 W / (m-K)) and / or a low thermal effusivity (e.g., less than 316 Ws1 / 2 / m2 / K, optionally anywhere from 38 Ws1 / 2 / m2 / K to 316 Ws1 / 2 / m2 / K) even at high temperatures (e.g., above 400 degrees Fahrenheit (° F.) (about 204 degrees Celsius (° C.)). Such a PAS foam layer may have characteristics appropriate for use as part of a steam hose.

An overmoulding method for making an overmould (2) forming a decoration to be added to a part (1) or a part itself, including: providing an ébauche (3) used as an injection tool, the ébauche (3) having at least one through hole (4) forming a channel (5) for injecting the metal alloy (8), the ébauche (3) being made of a first material with a thermal effusivity less than or equal to 7,000 W K−1 m−2 s½ or being at least partially plated with a layer made of the first material; positioning the ébauche (3) inside an injection mould (6); injecting the metal alloy (8) through the through hole (4) opening into a cavity to obtain the overmould (2); and detaching the overmould (2) from the ébauche (3) to form the decoration to be added or the part itself.

The invention relates to the technical field of honeycomb ceramics, in particular to a honeycomb ceramic with high heat storage performance and a preparation method thereof, and the honeycomb ceramic is prepared from the following raw materials in parts by weight: 60-80 parts of cordierite, 20-30 parts of silicon carbide, 15-20 parts of filler, 5-10 parts of additive, 5-10 parts of zirconium oxide, 5-10 parts of fayalite, 1-3 parts of methyl cellulose, 3-5 parts of binder and 3-5 parts of graphite powder. According to the invention, the filler takes aluminum-silicon oxide fibers prepared by an electrostatic spinning technology as a three-dimensional skeleton, has better thermal expansion coefficient matching property with a cordierite matrix, and realizes strong interface bonding through a KH550 treating agent, so that microcrack propagation caused by thermal mismatch between high-thermal-conductivity components such as silicon carbide and the matrix is effectively inhibited; and an additive composed of sodium nitrate, potassium nitrate and expansible graphite in the filler further improves the heat storage density through phase change latent heat and a heat conduction path, and the long-term heat storage performance and the service life of the filler are guaranteed.