EP4536772A1 - Fluide thermique comprenant des particules d'au moins un matériau calorique - Google Patents
Fluide thermique comprenant des particules d'au moins un matériau caloriqueInfo
- Publication number
- EP4536772A1 EP4536772A1 EP23734339.7A EP23734339A EP4536772A1 EP 4536772 A1 EP4536772 A1 EP 4536772A1 EP 23734339 A EP23734339 A EP 23734339A EP 4536772 A1 EP4536772 A1 EP 4536772A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- fluid
- systems
- field
- thermal
- weight
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K5/00—Heat-transfer, heat-exchange or heat-storage materials, e.g. refrigerants; Materials for the production of heat or cold by chemical reactions other than by combustion
- C09K5/02—Materials undergoing a change of physical state when used
Definitions
- the invention also relates to a thermal system comprising at least one composition as defined below, or a fluid as defined below, at least one hot source heat exchanger, at least one cold source heat exchanger and at least one cold source heat exchanger and at least one device capable of applying at least one physical field, preferably magnetic, electrical and/or mechanical, capable of causing a solid-solid phase transition within the caloric material.
- the present invention also relates to a heat transfer process comprising the circulation of a composition, as described below, or a fluid as described below, and the application of at least an external physical field capable of causing a solid-solid phase transition within the caloric material of the composition.
- Heat transfers are generally at the heart of many industrial and residential systems intended for varied applications involving the generation of heat or cold.
- the working fluid in the vapor phase is first compressed by a compressor and then liquefies, at constant temperature and pressure, in a condenser. .
- the refrigerant releases heat to the external environment because its entropy decreases.
- the refrigerant in liquid form is directed to a regulator in which its pressure is reduced and then is sent to an evaporator in order to be vaporized.
- the refrigerant receives heat from the medium to be cooled because its entropy increases.
- the refrigerant is finally returned to the compressor to begin a new cycle of condensation and evaporation.
- the working fluid vaporizes in the evaporator by absorbing the thermal energy provided by the heat of the medium to be cooled, for example the enclosure of a refrigerator. This thermal energy is then evacuated to the external environment during the circulation of the fluid in the condenser.
- Refrigeration systems particularly used in the medical, electronics and food industries, as well as air conditioning systems in the transport sector generally rely on this type of technology.
- heating systems such as those using heat pumps, operate on the same principle of heat exchange occurring during successive cycles of evaporation and condensation of a passing refrigerant. from liquid to vapor state.
- neopentyl glycol crystals have the capacity to deform, in particular by passing from a disordered crystalline phase to an ordered phase, under the action of pressure stress. relatively weak and return to their original form when this stress is removed while giving up or absorbing heat during these solid-solid phase changes. These crystals have a so-called “plastic” structure and have cooling performance likely to be equivalent to that of a standard refrigerant.
- an external physical field causes a reduction in entropy, for example a reduction in the entropy of dipoles in the case of an electric field or the obtaining of an ordered crystalline phase in the case of a pressure constraint, within the caloric material which causes a transfer of heat towards the cold source.
- the entropy of the material increases, for example the orientation of the dipoles becomes more and more random in the case of removing an electric field or the return to a more disordered crystalline phase in the case of removing a pressure stress, which causes heating and therefore heat transfer from the outside to the material.
- caloric material represents a static caloric solution requires the implementation of complex and expensive heat drainage systems whose effectiveness may prove limited.
- the present invention therefore particularly relates to a thermal fluid comprising solid particles of at least one caloric material having a variation in absolute value of the entropy AS greater than or equal to 100 J. K 1 . kg 1 , under the action of at least one external physical field, the content of which varies from 2 to 98% by weight, relative to the total weight of the fluid.
- the fluid according to the invention makes it possible to effectively promote the transfer of heat between the hot source and the cold source of a thermal system, thus giving it performance equivalent to current thermal systems while minimizing the negative impacts on the environmental and health levels. health.
- the application of at least one physical field makes it possible to activate the solid-solid phase transition of particles of at least one caloric material, as defined. previously, immersed in the fluid thus causing an exchange of heat within the fluid. This results in heat conduction between the particles of the caloric material, the fluid and the hot and cold sources of the thermal system, thus carrying out a work cycle.
- the fluid according to the invention has in particular the advantage of being able to transport the caloric material in the form of solid particles immersed in a fluid, which makes it possible to move the place where the material takes up heat and that where it evacuates it and improve heat transfer.
- the fluid according to the invention therefore allows the caloric material not to be fixed or static in a thermodynamic system or application involving heat transfer but to move in the form of a flowing fluid.
- the fluid according to the invention therefore has the advantage of minimizing the back and forth between the material and the cold source during an alternation of the applied physical field.
- the invention makes it possible to implement a caloric material in the form of particles in a fluid in order to generate an improved heat transfer between the hot source and the cold source of the thermal system.
- the fluid makes it possible to transport heat between several temperature sources, which means that it is not necessary to install devices intended to drain the heat from the caloric material.
- the present invention also relates to the use of the fluid, as defined above, as a heat transfer fluid, in particular in thermodynamic systems involving heat transfer.
- the present invention also relates to a composition comprising at least one fluid as defined above.
- the invention also relates to the use of the composition, as defined above, to transfer heat, in particular in thermodynamic systems involving heat transfer.
- the present invention also relates to a thermal system comprising at least one composition, as described above, or a fluid, as defined above, at least one hot source heat exchanger, at least one cold source heat exchanger , and at least one device for applying at least one physical field capable of causing a variation in the entropy AS greater than or equal to 100 JK ⁇ .kg 1 within the caloric material of said fluid.
- the thermal system according to the invention has particularly advantageous energy performances.
- Another object of the present invention further consists of proposing a heat transfer process comprising at least the circulation of a composition, as defined above, or of a fluid, as defined above, between at least one hot source heat exchanger and at least one heat exchanger cold source, and at least the application of a physical field to cause a variation in absolute value of the entropy AS greater than or equal to 100 J. K 1 .kg 1 within the caloric material of said fluid.
- the thermal fluid comprises solid particles of at least one caloric material having a variation in absolute value of the entropy AS greater than or equal to 100 J. K 1 .kg 1 , under the action of at least one external physical field, the content of which varies from 2 to 98% by weight, relative to the total weight of the fluid.
- the external physical field corresponds to an external stress applied at a level sufficient to induce a solid-solid phase transition within the caloric material, for example a change in orientation of dipoles during application. of an electric field or a structural change, from a disordered crystalline phase to an ordered crystalline phase, upon application of a pressure stress or a magnetic field.
- the solid-solid phase transition within the caloric material results in a variation in absolute value of the entropy AS of the material to a value greater than or equal to 100 JK ⁇ .kg 1 .
- Electrocaloric effects are, for example, evaluated in an electric field calorimeter.
- Magnetocaloric effects are, for example, evaluated in a magnetic field calorimeter.
- the variation in absolute value of the entropy AS of the caloric material occurs at a temperature ranging from 231 K to 420 K, preferably ranging from 233 K to 400 K, and more preferably 273 K to 320 K.
- the caloric material can be chosen from the group consisting of plastic crystals, in particular plastic crystals derived from neopentane comprising amine functions, hydroxyl functions and mixtures thereof, in particular neopentyl glycol, 2-amino-2-(hydroxymethyl) propane-1,3-diol, 2-amino-2-methyl-1,3-propanediol, 2-hydroxymethyl-2-methyl-1,3-propanediol, 2,2-dimethyl-1-propanol; salts such as ferroelectric salts, ammonium salts, in particular ammonium iodide, ammonium sulfate; organic-inorganic hybrid compounds such as organic perovskites, intermetallic compounds (for example based on transition metals such as iron, copper, cobalt, titanium, nickel, zirconium, manganese, rhodium, based poor metals such as aluminum, zinc, lead, based on metalloids such as germanium, silicon, boron, based
- the barocaloric material is a plastic crystal, in particular neopentyl glycol or 1-adamantanol, more particularly neopentyl glycol.
- the caloric material in the form of particles is present in a content ranging from 2 to 98% by weight, relative to the total weight of the fluid.
- the caloric material in the form of particles is present in a content preferably greater than or equal to 10% by weight, preferably greater than or equal to 15% by weight, preferably greater than or equal to 20% by weight, preferably greater than or equal to at 25% by weight, preferably greater than or equal to 30% by weight, preferably greater than or equal to 35% by weight, preferably greater than or equal to 40% by weight, preferably greater than or equal to 45% by weight, preferably greater than or equal to 50% by weight, relative to the total weight of the fluid.
- the caloric material in the form of particles is present in a content preferably less than or equal to 90%, preferably less than or equal to 85% by weight, more preferably less than or equal to 70% by weight, even more preferably less than or equal to 60% by weight, relative to the total weight of the fluid.
- the caloric material in the form of particles is present in a content varying from 2 to 90% by weight, from 2 to 85% by weight, from 2 to 70% by weight, from 2 to 60% by weight, relative to to the total weight of the fluid.
- the caloric material in the form of particles is present in a content varying from 10 to 90% by weight, preferably in a content varying from 20 to 80% by weight, more preferably in a content varying from 30 to 70% by weight. weight, even more preferably in a content varying from 40 to 60% by weight, relative to the total weight of the fluid.
- the caloric material in the form of particles is present in a content ranging from 40 to 95% by weight, more preferably in a content ranging from 50 to 90% by weight, relative to the total weight of the fluid.
- the particles of the caloric material have an average size ranging from 0.1 to 1000 pm, preferably an average size ranging from 1 to 500 pm.
- particle size corresponds to the maximum dimension that can be measured between two diametrically opposite points of an individual particle.
- the size can be determined, for example, by transmission electron microscopy or from the measurement of the specific surface area by the BET method or by means of a laser particle size analyzer.
- the average particle size is preferably a number average size.
- the fluid may be a heat transfer fluid, preferably liquid at a temperature of 23°C.
- the fluid is chosen from the group consisting of alcohols, oils, polar solvents and their mixtures.
- the fluid can be chosen from the group consisting of water, alkanes, alkenes, alcohols, ethers, esters, amines, amides, sulfoxides, fluoroalkanes, perfluoroalkanes, chloroalkanes, siloxanes.
- the fluid can be chosen from the group consisting of hexane, ethanol, toluene, propanone, di-n-propylether, tetrahydrofuran, 1-butanol, butanamide, pyrrolidine, dimethyl sulfoxide , 1-fluoropentane, water and polydimethylsiloxane and mixtures thereof.
- the fluid is chosen from the group consisting of alcohols, oils, polar solvents and their mixtures and the caloric material is a barocaloric material, in particular chosen from the group consisting of an alkylcarboxylic acid, a carboxylate salt of alkyl, in particular barium or calcium salts of alkyl carboxylate, a liquid crystal, for example 4-(trans-4-pentylcyclohexyl) benzonitrile (PCH5), a plastic crystal, in particular neopentyl glycol (NPG ) or 1-adamantanol, 2-amino-2-(hydroxymethyl)propane-1,3-diol, ammonium sulfate salts, and mixtures thereof.
- a barocaloric material in particular chosen from the group consisting of an alkylcarboxylic acid, a carboxylate salt of alkyl, in particular barium or calcium salts of alkyl carboxylate, a liquid crystal, for example 4-(trans-4-
- the composition comprises at least one fluid as defined above.
- the additive(s) may be present in the composition according to the invention at a content ranging from 0.05 to 5% by weight, preferably in a content ranging from 0.1% by weight to 3%, relative to the total weight of the composition.
- the present invention also relates to the use of the fluid, as defined above, as a heat transfer fluid, in particular in thermodynamic systems involving heat transfer.
- the fluid is used as a heat transfer fluid in thermodynamic systems or applications involving heat transfer.
- Cryogenic applications can be, for example, the liquefaction of natural gas or the liquefaction of hydrogen.
- the thermal system is an air conditioning system.
- the thermal system is a heating system.
- the method according to the invention is a heat transfer method within a thermal system, as described above, preferably chosen from the group consisting of a refrigeration system, an air conditioning system or a heating system. heating such as a heat pump.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Combustion & Propulsion (AREA)
- Thermal Sciences (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Soft Magnetic Materials (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR2205408A FR3136239A1 (fr) | 2022-06-06 | 2022-06-06 | Fluide thermique comprenant des particules d’au moins un matériau calorique |
| PCT/FR2023/050793 WO2023237831A1 (fr) | 2022-06-06 | 2023-06-05 | Fluide thermique comprenant des particules d'au moins un matériau calorique |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP4536772A1 true EP4536772A1 (fr) | 2025-04-16 |
Family
ID=82385660
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP23734339.7A Withdrawn EP4536772A1 (fr) | 2022-06-06 | 2023-06-05 | Fluide thermique comprenant des particules d'au moins un matériau calorique |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP4536772A1 (fr) |
| CN (1) | CN119604599A (fr) |
| FR (1) | FR3136239A1 (fr) |
| WO (1) | WO2023237831A1 (fr) |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB201617508D0 (en) * | 2016-10-14 | 2016-11-30 | Cambridge Enterprise Limited And Universitat Polit�Cnica De Catalunya And Universitat De Barc | Use of Barocaloric materials and Barocaloric devices |
-
2022
- 2022-06-06 FR FR2205408A patent/FR3136239A1/fr not_active Withdrawn
-
2023
- 2023-06-05 EP EP23734339.7A patent/EP4536772A1/fr not_active Withdrawn
- 2023-06-05 CN CN202380056628.0A patent/CN119604599A/zh active Pending
- 2023-06-05 WO PCT/FR2023/050793 patent/WO2023237831A1/fr not_active Ceased
Also Published As
| Publication number | Publication date |
|---|---|
| CN119604599A (zh) | 2025-03-11 |
| FR3136239A1 (fr) | 2023-12-08 |
| WO2023237831A1 (fr) | 2023-12-14 |
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