845results about "Refrigeration machines" patented technology

A cooling system including an evaporator, a passive condenser, a heat exchanger, and a pump. The passive condenser is arranged in parallel with the heat exchanger relative to the fluid flow of a primary cooling medium. When a secondary cooling medium is provided to the heat exchanger, at least some of a primary cooling medium in the gas phase switches from being received by the passive condenser to the heat exchanger without operating any valves and supplies the primary cooling medium in the liquid phase to the evaporator. When the secondary cooling medium is not provided to the heat exchanger, the heat exchanger does not supply the primary cooling medium in the liquid phase to the evaporator. The pump is located in a liquid line fluidly connecting the evaporator to the passive condenser and the heat exchanger and pumps the primary cooling medium in the liquid phase to the evaporator.

A refrigeration system utilizing a torsional elastothermal effect of shape memory alloy fibers, the refrigeration system comprising: a) a torsional elastothermal refrigerator having a fluid inlet and two fluid outlets; the heat transfer fluid pipeline system comprises a refrigerator, a radiator, a three-way valve, a liquid storage buffer and a water pump, is provided with a motor, controls switching of cold and hot flow channels in pipeline circulation by controlling the three-way valve, and is connected with the torsion elastic heat refrigerator in the system; the heat exchange and storage device comprises but not limited to a spiral coil radiator made of copper pipes and a heat storage container, the spiral coil radiator and the heat storage container are both connected with the heat transfer fluid pipeline system, and the memory alloy fibers are arranged in the torsion elastic heat refrigerator. The system is based on a novel driving mode of a periodic distortion structure, and has the effects of high efficiency, low hysteresis and low driving stress.

A method for cooling an information technology system, comprising: receiving a flow of at least a subcooled liquid phase change refrigerant; cooling the information technology system by sensible heat transfer in an evaporator, to produce at least gaseous refrigerant; and exchanging heat from the at least gaseous refrigerant from the evaporator to the subcooled liquid phase change refrigerant. The phase change refrigerant may be a hydrofluorocarbon ether having a boiling point of 30-65° C. at 1-12 bar.

The invention is an apparatus for amplifying cooling through interaction with electromagnetic radiation for optical of objects and / or object surfaces with essentially three layers, which are a bottom layer that is comprised of a single or multi layered material configured to emit IR radiation; a middle layer that is comprised of a single or multi layered material configured to respond in anti-Stokes fluorescence upon absorption of electromagnetic radiation; and a top layer that is comprised of a single or multi layered material configured to reflect selected spectral band(s) and / or amplify selected spectral band(s) of the electromagnetic radiation transmittable to the middle layer.

The invention discloses a damping device, a refrigerating machine assembly and a refrigerating system, and relates to the technical field of refrigerating system structures.The damping device is used for being connected between a machine head and a Dewar of a refrigerating machine, the damping device comprises a first damping structure and a second damping structure, the first damping structure comprises a mounting structure and a first elastic piece, and the second damping structure comprises a second elastic piece; the installation structure is used for being installed on the Dewar. One end of the first elastic piece is installed on the installation structure. The second vibration reduction structure comprises a second elastic piece, the second elastic piece and the first elastic piece are oppositely arranged in the first direction in a spaced mode, and one end of the second elastic piece is used for being installed on the Dewar; wherein the other end of the first elastic piece is used for being connected with one end, in the first direction, of the machine head, and the other end of the second elastic piece is used for being connected with the other end, in the first direction, of the machine head. The invention aims to solve the problem of operation vibration when a low-temperature system is built for an existing refrigerator.

The provided application describes methods and systems directed to the transfer of energy employing pressure sensitive materials.

The invention discloses a phase change energy storage-radiation refrigeration composite material for dynamic heat management and a preparation method thereof, and belongs to the technical field of building and human skin heat management. The method comprises the following steps: 1, fully melting liquid metal Ga; 2, doping metal particles into the liquid metal Ga; 3, preparing a Ga-based phase change energy storage material; and 4, combining the Ga-based phase change energy storage material with a radiation refrigeration film by adopting a heat-conducting double-faced adhesive tape to obtain the phase change energy storage-radiation refrigeration composite material for dynamic heat management. The phase change energy storage-radiation refrigeration composite material for dynamic heat management prepared by the invention can realize a refrigeration effect lower than room temperature when being used in buildings, and can also realize the effects of daytime heat buffering and night heat release, so that the temperature is dynamically adjusted; the thermoelectric power generation device has good thermoelectric power generation potential, can generate an output voltage greater than 100mV in a phase change stage, and also can continuously generate an output voltage of 20mV-40mV in a non-phase change stage.

The invention belongs to the field of heat pumps, and provides an integrated cooling and steam supply system which comprises a waste heat drive type absorption refrigerator and a first direct generation type high-temperature steam heat pump which are in bidirectional connection. The waste heat drive type absorption refrigerator comprises a first generator, a first evaporator, an absorber and a first condenser. The first direct generation type high-temperature steam heat pump comprises a first compressor, a throttling mechanism, a steam generator and a water vapor compressor. By absorbing waste heat in the technological process, cooling of an input medium and preparation of high-pressure steam are achieved, recycling of heat is completed, emission of pollutants is reduced, and the energy utilization efficiency is improved; through the first direct generation type high-temperature steam heat pump, loss caused by a conventional flash evaporation process is avoided, and the overall efficiency of the system is improved; the absorber and the first condenser serve as evaporators of the high-temperature steam heat pump, the intermediate circulating water heat exchange process is avoided, and the heat exchange efficiency is improved.

In one aspect, a heat transfer apparatus including a process fluid heat exchange circuit having a mechanical cooler with hot and cold side heat exchangers and a hybrid cooler to receive process fluid from the hot side heat exchanger and provide cooled process fluid to the cold side heat exchanger. The hybrid cooler includes direct and indirect heat exchangers. The hybrid cooler has a dry mode and a hybrid mode. The heat transfer apparatus includes a controller configured to operate the process fluid heat exchange circuit in one of a plurality of modes based at least in part upon a determination of a thermal duty of the heat transfer apparatus.

Passive cooling article (120) includes a plurality of first elements (122) defining a high absorbance in the atmospheric window wavelength range and defining high average reflectance in the solar wavelength range and a plurality of second elements (124) defining a low absorbance in the atmospheric window wavelength range and defining high average reflectance in the solar wavelength range, wherein the plurality of first (122) and second (124) elements are interspersed to form a major structure having a first major surface (130) comprising the first element outer surfaces (126) and the second element outer surfaces (128), wherein the first element outer surfaces (126) face a first direction toward a first end region (136) of the major structure (130) and the second element outer surfaces (128) face a second direction toward a second end region (136) of the major structure. The article (120) may be applied to a substrate (104), for example, on a generally vertical surface of a vehicle or stationary structure.

The invention provides a radiation refrigeration plate combining a sky radiation refrigeration material and a plate heat exchanger, and relates to the technical field of refrigeration, the radiation refrigeration plate comprises a sky radiation refrigeration material layer, a plate heat exchanger assembly, a fan cover layer and a heat insulation material layer, the sky radiation refrigeration material layer has high reflectivity in a solar spectrum wave band and has high emissivity in an atmospheric window wave band, and the plate heat exchanger assembly has high reflectivity in a heat insulation material layer; and heat can be efficiently radiated to the outer space. The plate heat exchanger assembly comprises an enhanced heat exchange tube and a nanofluid, and the nanofluid is filled in the enhanced heat exchange tube and used for heat transfer and transport capacity and enhancing the heat exchange effect. And the fan cover covers the sky radiation refrigeration material. The heat insulation material layer is laid on the portion, except the top face, of the radiation refrigeration plate so as to reduce heat loss of the system to the surrounding environment, and the refrigeration effect is guaranteed. By means of the structure, working modes in the daytime and at night are achieved, the heat transfer efficiency of the system is greatly improved, energy consumption is reduced, and the efficient radiation refrigeration effect of all-weather continuous operation at the temperature lower than the environment temperature is achieved.

The invention relates to the technical field of radiation refrigeration materials, in particular to a polyimide fiber membrane for radiation refrigeration and a preparation method and application thereof. The polyimide fiber membrane for radiation refrigeration comprises polyimide-containing resin and inorganic particles, the polyimide-containing resin is prepared from diamine and dianhydride, the diamine is selected from a combination of diamine A and other diamines, and the diamine A comprises at least one of 4-aminobenzene-2, 5-pyridine diamine and 4, 4 '-diaminodiphenylamine; the dianhydride at least comprises dianhydride B, and the dianhydride B is selected from at least one of 1, 2, 4, 5-hydrogenated pyromellitic dianhydride, 3, 3 ', 4, 4'-dicyclohexyltetracarboxylic dianhydride and 4, 4 '-(hexafluoroisopropylidene) diphthalic anhydride. The invention has the advantages of high whiteness, high temperature resistance, ultraviolet resistance, high relative refractive index and higher infrared absorptivity.

The invention provides a radiation refrigeration and photo-thermal integrated Janus polylactic acid fiber membrane and a preparation method thereof, the method comprises the following steps: step S1, dissolving a silicon source, an alkaline solvent A and deionized water in an alcohol solvent B, and mixing through UV irradiation to obtain a SiO2 suspension; s2, polylactic acid is dissolved in a solvent C, a polylactic acid fiber membrane is prepared through an electric centrifugal spinning technology, then the polylactic acid fiber membrane is soaked in the SiO2 suspension liquid, and a cooling layer fiber membrane is obtained; and S3, dissolving a photo-thermal functional factor, polylactic acid and a dispersing agent in a solvent D to obtain a heating layer spinning solution, preparing heating layer fibers through an electric centrifugal electrostatic spinning technology, and depositing the heating layer fibers on a cooling layer fiber membrane. The Janus polylactic acid fiber membrane prepared by the preparation method disclosed by the invention has cold and hot dual functions, and the temperature adjusting range is widened. The two-way temperature adjusting mechanism can reduce the body surface temperature in a hot environment, heat is generated in a cold environment to meet the heat requirement, and the heat comfort requirement of a human body in different seasons is met.

The invention relates to the technical field of energy-saving materials, and discloses a preparation method of a self-assembled multilayer radiation refrigeration film, the self-assembled multilayer radiation refrigeration film comprises: a surface coating composed of a super-hydrophobic coating and used for providing anti-fouling and self-cleaning functions; the top layer is composed of titanium dioxide nanoparticles and has high sunlight reflectivity; the middle layer is a polytetrafluoroethylene layer with a hierarchical porous structure and provides thermal insulation and efficient mid-infrared emission; the bottom layer is composed of graphene oxide, has high heat conduction performance and promotes heat transfer; and the substrate is a flexible polyester film PET and is used as a supporting structure. Through the titanium dioxide nano-particle design of the top layer and the graded porous structure of the middle layer, the film achieves the reflectivity exceeding 90% in the sunlight band (400-2500nm), meanwhile, the film has the radiance exceeding 85% in the middle infrared band (8-13mu m), and due to the optical performance, surface heat absorption can be remarkably reduced under the intense sunlight condition.

The invention discloses a double-selectivity all-inorganic radiation refrigeration film and a preparation method thereof.The film comprises an adhesion layer, a metal reflection layer and a multi-layer dielectric film layer, the adhesion layer is arranged on a bottom layer, the metal reflection layer is arranged on the upper surface of the adhesion layer, and the multi-layer dielectric film layer is arranged on the upper surface of the metal reflection layer; the multi-layer dielectric film layer comprises a quasi-periodic multi-layer film structure which is formed by two materials of which the refractive index difference is greater than a preset threshold value according to a preset thickness in a preset arrangement mode; wherein the number of layers, the preset arrangement mode and the preset thickness of the multiple dielectric film layers are obtained by optimizing an ideal spectrum selectively emitted by the double atmospheric transmission windows as an optimization target. The radiation refrigeration film has the characteristic of high reflection in the solar spectrum range, and can selectively emit infrared rays at the first atmospheric window and the second atmospheric window at the same time, so that the radiation refrigeration film has higher refrigeration potential than an existing radiation refrigeration emitter.

The invention discloses a refrigerating system for providing cooling capacity in a liquid nitrogen temperature zone. The refrigerating system comprises a compressor, a pre-cooling unit, a throttling valve and a cold end heat exchanger which are sequentially connected to form a liquid nitrogen throttling refrigerating unit. The pre-cooling unit comprises a first-stage pre-cooling heat exchanger and a second-stage pre-cooling heat exchanger which are arranged in series, the cooling capacity of the first-stage pre-cooling heat exchanger is provided by a refrigeration unit capable of providing the refrigeration temperature of 265-285K, and the cooling capacity of the second-stage pre-cooling heat exchanger is provided by a refrigeration unit capable of providing the refrigeration temperature of 190-220K. Compared with the traditional non-precooling working condition, the precooling at the inlet of the heat exchanger has the advantages that the high pressure is obviously reduced, the pressure ratio is small, and the cooling capacity is sufficient. The advantage is particularly obvious when the pre-cooling temperature is low. And a two-stage refrigeration mode is adopted, accurate control over the cooling capacity can be achieved, and the energy consumption of the system is reduced while it is guaranteed that the cooling capacity is sufficient. In addition, photovoltaic power is used for providing electric energy, the ice storage tank is adopted, and energy conservation and consumption reduction in the refrigeration process can be achieved through the electricity price peak-valley price difference.

To provide an elastocaloric heat pump that meets high tightness requirements and has a high efficiency, an elastocaloric heat pump (100) comprising at least one first cooling medium channel (10), at least one second cooling medium channel (11), at least one elastocaloric element (12), and a drive device (15) is proposed, wherein the at least one elastocaloric element (12) is arranged between a first cooling medium channel (10) and a second cooling medium channel (11) and is connected at its end to a slide (13) in each case, wherein the slides (13) are slidably arranged on two guide means (14) that are not arranged parallel to each other, wherein the drive device (15) is configured to cyclically move the slides (13) along the guide means (14) so ​​that the at least one elastocaloric element (12) alternately comes into thermal contact with an outer wall (16),in particular with a contact area (31) of an outer wall (16), of the first cooling medium channel (10) and is brought into thermal contact with an outer wall (17), in particular with a contact area (31) of an outer wall (17), of the second cooling medium channel (11).

A method of operation is provided during which heat energy is transferred into a first heat exchange fluid during a first mode of operation and during a second mode of operation. The first heat exchange fluid is directed through a first flowpath of a heat exchanger during the first mode of operation and during the second mode of operation. A second heat exchange fluid is directed through a second flowpath of the heat exchanger during the first mode of operation. At least some of the heat energy is transferred from the first heat exchange fluid into the second heat exchange fluid. A third heat exchange fluid is directed through a third flowpath of the heat exchanger during the second mode of operation. At least some of the heat energy is transferred from the first heat exchange fluid into the third heat exchange fluid.

The utility model discloses a combined heat and power generation system of an integrated heat pump. The combined heat and power generation system comprises a steam turbine system and a heat supply network water heating system. The steam turbine system comprises an intermediate-pressure cylinder, a low-pressure cylinder and a condenser; the heat supply network water heating system comprises a condenser (electric heat pump), an absorber, a condenser (absorption heat pump) and a peak heater. Heat supply network return water is connected with an evaporator heat source inlet of the absorption heat pump, an evaporator heat source outlet is connected with a condenser heat supply network water inlet of the electric heat pump, a heat supply network water outlet of the electric heat pump is connected with an absorber heat supply network water inlet of the absorption heat pump, and a heat supply network water outlet of the absorber is connected with a condenser heat supply network water inlet of the absorption heat pump. A heat supply network water outlet of the condenser is connected with a heat supply network water inlet of the peak heater, and a heat supply network water outlet of the peak heater is connected with a heat supply network to supply water for the heat supply network. By recycling more waste heat, the heat supply capacity and the total efficiency of the system are improved while the combined heat and power generation system obtains more flexible power generation load adjusting capacity.

The invention relates to a photovoltaic heat dissipation enhanced radiation refrigeration cement-based composite material as well as a preparation method and application thereof. The composite material comprises white Portland cement, radiation refrigeration particles and water, the radiation refrigeration particles comprise alpha aluminum oxide and barium sulfate, the mass fraction of the radiation refrigeration particles relative to the total solid content in the composite material is 30%-60%, and the mass ratio of the alpha aluminum oxide to the barium sulfate is 1: 1-2: 1; the average particle size of the radiation refrigeration particles is 0.3-10 [mu] m; the mass fraction of the white Portland cement relative to the total solid content in the composite material is 40-70%. Compared with the prior art, the reflectivity and emissivity of the material are improved, efficient photovoltaic thermal management is achieved, meanwhile, the material has the advantages of being low in cost, simple in process, high in stability and the like, development of the building photovoltaic integrated technology is expected to be promoted, and the energy utilization efficiency is improved.

Embodiments described herein relate to a self-adaptive thermal management system. The thermal management system includes a first body, a second body, and a third body. The second body has a first layer and a second layer formed from a Weyl semimetal and a third layer sandwiched between the first layer and the second layer. The third layer is formed from a vanadium dioxide film. The second body is spaced apart from the first body. The third body is spaced apart from the second body. The second body is a modulator configured to transition between a metallic phase and an insulating phase dependent on a temperature to regulate a heat from the first body to the third body through the second body in a self-adaptive manner dependent on the temperature.

A system for optical cooling comprises a substrate and a first waveguide supported by the substrate, with the first waveguide configured to provide optical cooling by fluorescence up-conversion. A first optical fiber is coupled to the first waveguide, with the first optical fiber configured to deliver cooling light to the first waveguide. A second waveguide is supported by the substrate, with the second waveguide adjacent to or coincident with the first waveguide. The interaction of the cooling light with the first waveguide produces a zone of local optical refrigeration based on the fluorescence up-conversion, such that the second waveguide is optically cooled by physical proximity to the first waveguide.

Barocaloric heat transfer systems and related methods are generally described. In some embodiments, a heat transfer system may include a barocaloric material which may generate heat upon compression and may cool down upon decompression. The barocaloric material may be pressurized using high pressure and low pressure fluids, which may, in some embodiments, also transfer heat to / from the barocaloric material. The heat transfer system may also include a hot heat exchanger to dissipate heat from the heat transfer system to a first environment and a cold heat exchanger to absorb heat from a second environment, effectively cooling the second environment. In some embodiments, the barocaloric material may be in particulate form.

The invention discloses an automobile static temperature control system of a coupled radiation refrigeration automobile cover and a phase change heat storage module, and belongs to the field of heat management materials. A radiation refrigeration automobile cover covers an automobile, a phase change heat storage module is placed in the automobile, when temperature rises in the daytime, most heat is isolated by the radiation refrigeration automobile cover by reflecting solar radiation, high-density infrared radiation and low thermal conductivity, and when remaining heat enters a compartment, the interior of the compartment is kept in a low-temperature state through constant-temperature absorption of the phase change heat storage module; when the air temperature drops and at night, heat stored by the phase change heat storage module is quickly transmitted to the outside through high-density infrared radiation of the radiation refrigeration car cover, so that the interior of the compartment is in a low-temperature state. Under the dual-function coupling effect, the low-temperature state in a compartment is achieved, automobile starting temperature control energy consumption is reduced, the comfort degree of a human body is improved, and the risks of aging of elements in an automobile and spontaneous combustion of a power battery caused by high temperature are reduced.

The invention relates to the technical field of functional materials, and particularly discloses polyvinyl alcohol-based aerogel with radiation cooling and fireproof characteristics as well as a preparation method and application of the polyvinyl alcohol-based aerogel. The preparation method comprises the following steps: compounding polyvinyl alcohol with radiation cooling hybrid particles containing elements such as P, N and Si, and preparing high-whiteness polyvinyl alcohol-based aerogel with a micro-nano dual-scale porous structure through a freeze-drying method; the double-scale porous structure of the aerogel enhances diffuse reflection of light; molecular bonds such as C-C, C-H, Si-O, N-H, P-O and the like are efficiently emitted in an atmospheric window area. The phonon polarization-phonon resonance characteristic of the hybrid particles is beneficial to radiation emission of heat and reduction of absorption of sunlight, and meanwhile, elements such as P, N and Si effectively improve the flame retardant property of polyvinyl alcohol. The preparation method disclosed by the invention is simple and low in cost, and the prepared polyvinyl alcohol-based aerogel shows excellent refrigeration effect and fireproof safety and can be applied to the fields of building energy conservation and the like.

The invention relates to a high-reflectivity high-entropy rare earth phosphate radiation refrigeration pigment, the high-entropy rare earth phosphate radiation refrigeration pigment has a monazite phase with a monoclinic system structure, the chemical formula of the pigment is (A1xA2yA3zA4uA5v) PO4, A1, A2, A3, A4 and A5 are any five rare earth cations of La, Ce, Yb, Gd, Nd and Eu, the cations are in an equimolar ratio, and x, y, z, u and v meet the condition that x + y + z + u + v = 2. Meanwhile, the invention also discloses a preparation method of the high-entropy rare earth phosphate radiation refrigeration pigment. The high-entropy rare earth phosphate radiation refrigeration pigment has high infrared emissivity in air, the emissivity reaches 0.90 or above within the wave band of 8-13 microns, the solar reflectivity reaches 0.93 or above within the wave band of 0.3-2.5 microns, and the high-entropy rare earth phosphate radiation refrigeration pigment has wide application prospects in the fields of building energy conservation, urban heat island effect reduction, photovoltaic power generation efficiency improvement and the like.

The invention provides a coupled refrigeration and cold supply decoupling system and a design method, and the system comprises a first thermodynamic system which comprises a first condensation module and a first evaporation module; the second thermodynamic system comprises a first generation module and a second condensation module; the first generation module and the first condensation module are subjected to non-substance exchange energy coupling, the first condensation module drives the first generation module to generate vaporization through condensation heat release, and the second condensation module and the first evaporation module are subjected to non-substance exchange energy coupling; the first evaporation module drives the second condensation module to generate condensation through evaporation heat absorption. The coupling type refrigeration and cold supply decoupling system can effectively couple the compression type heat pump system and the absorption / adsorption type refrigeration system, high-grade heat released in the condensation process of the compression type system is used as a heat source of the absorption system, and energy gradient utilization between the compression type system and the absorption system is achieved; and the time relation between refrigeration and cold supply is effectively decoupled.

An atomic object confined in a particular region of an atomic object confinement apparatus is cooled using an S-to-P-to-D EIT cooling operation. A controller associated with the atomic object confinement apparatus controls first and second manipulation sources to respectively provide first and second manipulation signals to the particular region. The first manipulation signal is characterized by a first wavelength corresponding to a transition between an S manifold and a P manifold of a first component of the atomic object and detuned from the S-to-P transition by a first detuning. The second manipulation signal is characterized by a second wavelength corresponding to a transition between the P manifold and a D manifold of the first component and detuned from the P-to-D transition by a second detuning. The first and second detunings selected to establish a dark state associated with a two-photon transition between the S manifold and the D manifold.

A system to extract water from the environment and control temperature through heat transfer between two or more environments, with low energy consumption, for domestic, commercial, or industrial use, which comprises: at least one force unit (10), capable of increasing or decreasing the pressure of the thermal working fluid, wherein the force unit (10) comprises one cylinder (1), which comprises within at least one plunger (2) joined to a piston (27), wherein the piston (27) moves alternately through the activation of a directional control valve (29) that receives hydraulic fluid from a hydraulic pump (32); at least one closed chamber connected to the cylinder (1), wherein that closed chamber comprises at least one tube (12) joined with at least one closed radiator (8a, 8b) wherein thermal working fluid is compressed inside that closed chamber, wherein the change from liquid to solid state or vice versa occurs, or from solid to another solid state or vice versa; and a control unit (11) that regulates the operation of the directional control valve (29) according to the temperature and pressure obtained from the closed chamber; a first (92) and a second (93) heat transfer circuit, wherein the valves (37as, 37ai, 37bs, 37bi; 81ai, 81bs, 81bi; 81as, 81ai, 81bs, 81bi) are operated by a control unit (11) and associated method.

The utility model relates to the technical field of refrigerating units, and discloses a screw type brine refrigerating unit which comprises a main body mechanism, a buffer mechanism and an installation connecting mechanism, the buffer mechanism is located in front of the main body mechanism, and the installation connecting mechanism is located below the main body mechanism. The main body mechanism comprises a protective box body, a placing plate, a screw type brine refrigerating unit body and a mounting and fixing assembly, the placing plate is movably mounted in the protective box body, the screw type brine refrigerating unit body is movably mounted at the upper end of the placing plate, and the mounting and fixing assembly is located above the placing plate. According to the screw type brine refrigerating unit, the main body mechanism is mounted, so that the mounting and fixing capacity of the screw type brine refrigerating unit is improved, the screw type brine refrigerating unit body can be conveniently mounted and fixed according to use requirements in the actual use process, the mounting and using stability is improved, and the service life of the screw type brine refrigerating unit is prolonged. And the use convenience of the screw type brine refrigerating unit is improved.