Low-power radiation plate and application thereof

Abstract

The application provides a low-power radiation plate and application thereof, which comprises a heat preservation shell, the heat preservation shell is a cavity with an inner cavity, a radiation source material layer and a phase change material layer are sequentially arranged in the heat preservation shell from top to bottom, and resistance wires are arranged around the phase change material layer; the phase change material layer is used for latent heat energy storage, the resistance wires are used for assisting the latent heat energy storage of the phase change material layer, and the radiation source material layer is used for absorbing the energy of the phase change material layer and radiating. In the application, the low-power radiation plate can be normally used under the condition that the electric energy is not easily obtained, so that the radiation plate can be calibrated and detected by various radiation thermometers, and the low-power radiation plate has smaller energy consumption compared with the traditional radiation plate.

Description

Technical Field

[0001] This invention relates to the field of radiant panel technology, and in particular to a low-power radiant panel and its applications. Background Technology

[0002] A radiant panel typically refers to a plate-shaped HVAC unit, which is a heater that emits infrared radiation or a refrigerator that absorbs infrared radiation for cooling. When the emissivity of a radiant panel is close to that of a blackbody, it can be considered a blackbody furnace for calibrating and testing various radiation thermometers, such as optical pyrometers, infrared thermal imagers, and infrared thermometers.

[0003] In existing technologies, to achieve the required operating conditions for engineering applications and to calibrate and test various thermometers, radiant panels are often heated directly or indirectly using electrical energy to reach the desired temperature. However, in certain special environments (such as the wilderness, deserts, or the sea), access to electricity is inconvenient, making it impossible to power the radiant panels. Furthermore, conventional radiant panels consume a significant amount of energy, failing to meet energy-saving requirements. Therefore, there is a need to provide a low-power radiant panel. Summary of the Invention

[0004] This invention provides a low-power radiation plate and its application. The radiation plate can still be used normally when power is inconvenient, thereby enabling the calibration and testing of various radiation thermometers.

[0005] In a first aspect, the present invention provides a low-power radiating plate, comprising an insulating shell, wherein the insulating shell is a hollow cavity, and a radiation source material layer and a phase change material layer are arranged sequentially from top to bottom inside the insulating shell, and resistance wires are arranged around the phase change material layer; the phase change material layer is used for latent heat energy storage, the resistance wires are used to assist the latent heat energy storage of the phase change material layer, and the radiation source material layer is used to absorb the energy of the phase change material layer and radiate it.

[0006] Preferably, the thermal insulation shell is further provided with a temperature sensor, which is used to monitor the temperature of the phase change material and the radiation source.

[0007] Preferably, the temperature sensor includes a first temperature sensor and a second temperature sensor, the first temperature sensor being located on the upper and lower surfaces of the phase change material layer; the second temperature sensor being located on the surface of the radiation source material layer.

[0008] Preferably, the number of the first temperature sensors is 1 to 2; the number of the second temperature sensors is 2 to 4.

[0009] Preferably, the thickness of the radiation source material layer is 1–2 mm;

[0010] Preferably, the resistance wire is wound around the phase change material layer, and there is a gap between the resistance wire and the radiation source material layer.

[0011] Preferably, the thermal insulation outer shell is at least one of glass fiber, asbestos, rock wool, silicate or aerogel felt.

[0012] Preferably, the phase change material is one of solid-solid phase change, solid-liquid phase change, solid-gas phase change, or liquid-gas phase change materials.

[0013] Preferably, the upper surface of the radiation source material layer is further provided with a movable heat-insulating cover, which is connected to the outer shell of the heat-insulating cavity.

[0014] In a second aspect, the present invention provides a method for reducing the power consumption of a radiation source, using a low-power radiation plate as described in any one of the first aspects above, the method comprising:

[0015] (1) The phase change material is placed inside the heat insulation shell, and resistance wires are set around the phase change material. A first temperature sensor is set on the upper and lower surfaces of the phase change material to obtain a phase change material layer.

[0016] (2) Place the radiation source material on the phase change material layer and place a second temperature sensor on the upper surface of the radiation source material to obtain the radiation source material layer;

[0017] (3) The phase change material layer is heated using the resistance wire. After the first temperature sensor reaches the first preset temperature, the heating is stopped to obtain a phase change material layer with latent heat storage function; the first preset temperature is the temperature at which the phase change material undergoes a phase change.

[0018] (4) The phase change material layer with latent heat storage function is used to heat the radiation source material layer until the temperature of the second temperature sensor reaches the required temperature.

[0019] Compared with the prior art, the present invention has at least the following beneficial effects:

[0020] In this invention, the radiant plate utilizes the latent heat storage properties of phase change materials to heat the radiation source material, thereby enabling the calibration and testing of various radiation thermometers even when electricity is inconvenient to obtain. Furthermore, compared with existing radiant plates, the radiant plate in this invention consumes less power and can meet energy-saving requirements. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the structure of a low-power radiating plate provided in an embodiment of the present invention;

[0023] In the diagram: 100 - Insulation shell; 200 - Radiation source material layer; 300 - Phase change material layer; 400 - Resistance wire; 501 - First temperature sensor; 502 - Second temperature sensor; 600 - Insulation cover. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0025] like Figure 1 As shown, the present invention first provides a low-power radiating plate, which includes a heat-insulating shell 100, which is a hollow cavity. A radiation source material layer 200 and a phase change material layer 300 are sequentially arranged from top to bottom inside the heat-insulating shell 100. Resistance wires 400 are arranged around the phase change material layer 300. The phase change material layer 300 is used for latent heat energy storage, and the resistance wires 400 are used to assist the latent heat energy storage of the phase change material layer 300. The radiation source material layer 200 is used to absorb the energy of the phase change material layer 300 and radiate it.

[0026] In this invention, the radiant plate utilizes the latent heat storage of phase change materials to heat the radiation source material, thereby enabling the calibration and testing of various radiation thermometers even when electricity is inconvenient to obtain. Furthermore, compared with existing radiant plates, the radiant plate in this invention consumes less power and can meet energy-saving requirements. The specific process of latent heat energy storage of phase change materials is as follows: First, the resistance wires around the phase change material layer are heated. The resistance wires are connected to a small generator or UPS power supply. By starting the small generator or UPS power supply, the resistance wires can convert electrical energy into heat energy, thereby achieving uniform heating of the phase change material layer (i.e., energy storage of the phase change material). When the heat reaches the temperature at which the phase change material undergoes a phase change, the phase change material undergoes a phase change and releases a large amount of heat. At this time, the phase change material layer can conduct the heat to the radiation source material layer through thermal conduction (i.e., the latent heat of the phase change material). As the heat is transferred, the temperature of the radiation source material layer gradually rises. When the radiation source material layer completely absorbs the heat released by the phase change material layer, the temperatures of the radiation source material layer and the phase change material layer reach thermal equilibrium, and the temperature of the radiation source material layer can reach the required temperature, which can then be used to detect and calibrate various radiation thermometers.

[0027] It should be noted that there are no particular restrictions on the specific type of phase change material in this invention. The material can be selected according to the application requirements of the project. For example, when the required temperature is 40-50°C, the phase change material should also be a phase change material with a phase change temperature of 40-50°C. For example, it can be an organic phase change wax. In this invention, the radiation source material is a material with a high thermal conductivity and an emissivity similar to that of a blackbody. For example, it can be a steel plate with a high emissivity coating. One side of the radiation source material layer is in close contact with one side of the phase change material layer to ensure that the radiation source material layer is heated evenly and completely.

[0028] According to some preferred embodiments, the thermal insulation shell 100 is further provided with a temperature sensor, which is used to monitor the temperature of the phase change material layer 300 and the radiation source material layer 200.

[0029] According to some preferred embodiments, the temperature sensor includes a first temperature sensor 501 and a second temperature sensor 502, wherein the first temperature sensor 501 is located on the upper and lower surfaces of the phase change material layer 300; and the second temperature sensor 502 is located on the upper surface of the radiation source material layer 200.

[0030] In this invention, a temperature sensor is also provided inside the heat-insulating shell. The temperature sensor is connected to a data acquisition card and a PC. Specifically, the temperature sensor includes a first temperature sensor for monitoring the temperature of the phase change material layer and a second temperature sensor for monitoring the temperature of the radiation source material layer. When the phase change material layer is heated by a resistance wire, the first temperature sensor can determine whether the temperature at which the phase change material undergoes a phase change can be reached. When the temperature of the phase change material reaches the phase change temperature, the heating of the resistance wire is stopped, and the phase change material layer enters a latent heat mode. Through heat conduction, the phase change material layer transfers heat energy to the radiation source material layer. The second temperature sensor on the surface of the radiation source material layer determines whether the temperature of the radiation source material layer is the same as the temperature of the first temperature sensor. When the two temperatures are the same, that is, the phase change material layer and the radiation source material layer reach a thermal equilibrium state, the radiation plate can be used to calibrate and test the radiation thermometer.

[0031] According to some preferred embodiments, the number of the first temperature sensors 501 is 2 to 4 (for example, 2, 3 or 4); the number of the second temperature sensors 502 is 1 to 2 (for example, 1 or 2).

[0032] In this invention, by placing a first temperature sensor on the upper and lower surfaces of the phase change material layer, it is possible to observe whether the temperatures of the upper and lower surfaces of the phase change material layer are consistent, thereby ensuring the temperature uniformity of the phase change material layer. The side of the phase change material layer that contacts the bottom of the insulation shell is the lower surface, and the side of the phase change material layer that contacts the radiation source material layer is the upper surface. Since the radiation source material layer absorbs the heat released by the phase change material layer through thermal conduction, it is only necessary to place a second temperature sensor on the upper surface of the radiation source material layer to observe whether the required temperature has been reached through the temperature of the second temperature sensor.

[0033] According to some preferred embodiments, the thickness of the radiation source material layer 200 is 1-2 mm (e.g., 1 mm, 1.2 mm, 1.5 mm, 1.8 mm, or 2 mm). In this invention, by controlling the thickness of the radiation source material layer within a certain range, it is more beneficial to ensure that the radiation plate meets the actual application requirements with lower power consumption. If the thickness of the radiation source material layer is higher than the above range, the heat transfer time from the phase change material layer to the radiation source material layer will be too long. Conversely, if the thickness of the radiation source material layer is lower than the above range, the heat dissipation of the radiation source material layer will be too fast, which is not conducive to practical applications. At the same time, the thickness of the phase change material layer in this invention mainly depends on the energy storage required in the actual engineering. It can generally be determined by calculating using the following formula based on the required temperature of the radiation source material layer, the thickness of the radiation source material, engineering requirements, and relevant parameters of the phase change material (e.g., phase change temperature, latent heat of phase change, specific heat capacity, etc.).

[0034]

[0035]

[0036] In the formula, t is the heating time (s); d P C represents the thickness (m) of the phase change material. P1 and C P2 ρ represents the specific heat capacity (J / (kg·K)) of the phase change material in phase 1 and phase 2, respectively; H and L represent the specific enthalpy and latent heat (J / kg) of the phase change material, respectively; ρ represents the specific heat capacity (J / (kg·K)) of the phase change material in phase 1 and phase 2 ... r and ρ P The densities (kg / m³) of the radiation source material and the phase change material are respectively. 3 );k r h is the thermal conductivity of the radiation source material (W / (m·K)); a air convection heat transfer coefficient (W / (m)) 2 ·K); A r d r The upper surface area (m²) of the radiation source material are respectively 2 ) and thickness (m); ε r σ is the surface emissivity of the radiation source material; σ is the Stefan-Boltz diffuse constant; T P T a T r These represent the temperatures (K) of the phase change material, the environment, and the radiation source, respectively; T min and T max These are the starting and ending temperatures (K) of the phase transition, respectively.

[0037] According to some preferred embodiments, the resistance wire 400 is wound around the phase change material layer 300, and there is a gap between the resistance wire 400 and the radiation source material layer 200.

[0038] In this invention, resistance wires are arranged around the perimeter of the phase change material layer. These resistance wires can be wound around the perimeter of the phase change material layer or placed around the perimeter of the insulation shell after being wound. This invention does not impose any particular limitation on the winding interval of the resistance wires; it can be set according to the actual application process. For example, when the required temperature in actual operating conditions is high, the heat required to heat the phase change material is large, so the resistance wires can be tightly wound around the perimeter of the phase change material. When the required temperature in actual operating conditions is low, the heat required by the phase change material is small, and in this case, resistance wires with a certain interval can be arranged around the perimeter of the phase change material. Furthermore, in this invention, the resistance wires are arranged around the perimeter of the phase change material layer and do not come into contact with the radiation source material layer, thus preventing the radiation source material layer from being heated and its temperature increased through the resistance wires.

[0039] According to some preferred embodiments, the thermal insulation outer shell 100 is at least one of glass fiber, asbestos, rock wool, silicate or aerogel felt.

[0040] The heat-insulating shell in this invention is made of heat-insulating materials, such as glass fiber, asbestos, rock wool, silicate or aerogel felt. By placing the phase change material layer and the radiation source material layer inside the heat-insulating shell, heat exchange between the prepared radiation plate and the surrounding environment can be avoided, thereby reducing the heat loss of the radiation plate.

[0041] According to some preferred embodiments, the phase change material is one of solid-solid phase change, solid-liquid phase change, solid-gas phase change, or liquid-gas phase change materials.

[0042] According to some preferred embodiments, the upper surface of the radiation source material layer is further provided with a movable heat preservation cover 600, which is connected to the heat preservation shell 100.

[0043] It should be noted that in this invention, the radiation source material layer and the phase change material layer are not bonded together when not in use, and the heat insulation cover on the upper surface of the radiation source material layer is movable. In this way, when the radiation source is used in practice, it is beneficial to tightly bond the radiation source material layer and the phase change material layer by means of the heat insulation cover on the upper surface of the radiation source material layer, thereby realizing the heating of the radiation source without power, and then using the radiation source to calibrate instruments and equipment, etc.

[0044] The device used in this invention is simple, small in size, flexible in design, and easy to use. Furthermore, during the phase change thermal storage process, the temperature of the phase change material itself remains essentially constant or nearly constant, which is beneficial for controlling the temperature of the storage system. Using phase change materials with latent heat storage properties to directly heat the radiation source instead of a high-power power supply can reduce the power consumption of the radiation source, meeting energy-saving requirements.

[0045] The present invention also provides a method for reducing the power consumption of a radiation source, using the low-power radiation plate described in any of the preceding claims, the method comprising:

[0046] (1) The phase change material is placed inside the heat insulation shell, and resistance wires are set around the phase change material. A first temperature sensor is set on the upper and lower surfaces of the phase change material to obtain a phase change material layer.

[0047] (2) Place the radiation source material on the phase change material layer and place a second temperature sensor on the upper surface of the radiation source material to obtain the radiation source material layer;

[0048] (3) The phase change material layer is heated using the resistance wire. After the first temperature sensor reaches the first preset temperature, the heating is stopped to obtain a phase change material layer with latent heat storage function; the first preset temperature is the temperature at which the phase change material undergoes a phase change.

[0049] (4) The phase change material layer with latent heat storage function is used to heat the radiation source material layer until the temperature of the second temperature sensor reaches the required temperature.

[0050] In this invention, a phase change material (PCM) is first placed inside an insulated outer shell, and resistance wires are arranged around the PCM. These resistance wires can be connected to a small generator or a UPS power supply. When the PCM needs energy storage, the small generator or UPS connected to the resistance wires can be started. The resistance wires, when energized, convert electrical energy into heat energy. By arranging the resistance wires around the PCM, the resistance wires can uniformly heat the PCM. A first temperature sensor on the upper and lower surfaces of the PCM layer and a second temperature sensor on the surface of the radiation source material layer are connected to a data acquisition card and a PC. By observing the first temperature sensor, when the temperature in the first temperature sensor reaches the core of the PCM layer... When the phase change material reaches the phase change temperature, the heating is stopped, resulting in a phase change material layer with latent heat storage function. When a radiation source is needed for engineering applications, the radiation source material layer and the phase change material layer can be tightly bonded together. The radiation source is heated by the phase change material with sufficient energy storage. The tight bonding between the radiation source material and the phase change material reduces heat loss and ensures that the radiation source material is heated uniformly. When the radiation source material layer completely absorbs the heat released by the phase change material layer, the temperatures of the radiation source material layer and the phase change material layer reach thermal equilibrium. The temperature of the second temperature sensor on the surface of the radiation source reaches the temperature required for the engineering, and the radiation source can then be used for cooling, heating, or calibrating instruments and equipment.

[0051] To more clearly illustrate the technical solution and advantages of the present invention, a low-power radiating plate and its application are described in detail below through several embodiments.

[0052] Example 1:

[0053] A low-power radiant panel includes an insulating shell (glass fiber), which is a hollow cavity. Inside the insulating shell, from top to bottom, there are a radiation source material layer (a steel plate coated with blackbody furnace radiation coating) and a phase change material layer (organic phase change wax). Resistance wires are tightly wound around the perimeter of the phase change material layer, and the resistance wires do not contact the radiation source material layer. The thickness of the phase change material layer is 300 mm, and the thickness of the radiation source material layer is 2 mm. The phase change material layer is used for latent heat energy storage, the resistance wires are used to assist the latent heat energy storage of the phase change material layer, and the radiation source material layer is used to absorb the energy of the phase change material layer and radiate it. The insulating shell also contains a first temperature sensor (4 sensors) and a second temperature sensor (2 sensors). The first temperature sensors are located on the upper and lower surfaces of the phase change material layer, and the second temperature sensors are located on the upper surface of the radiation source material layer. The first temperature sensors are used to monitor the temperature of the phase change material layer, and the second temperature sensors are used to monitor the temperature of the radiation source material layer.

[0054] The phase change material layer is heated to 50°C, the temperature at which the phase change occurs, by means of a resistance wire. Heating is then stopped. The phase change material layer then conducts heat to the radiation source material layer through thermal conduction. The second temperature sensor reaches 50°C. In this embodiment, the power required to heat the resistance wire is 300W.

[0055] Comparative Example 1:

[0056] Compared with the blackbody furnace radiation source commonly used in existing technology, the heating power of this comparative example is 1000W.

[0057] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A low power consumption radiant panel, characterized in that, The low-power radiation plate comprises a heat preservation shell, which is a hollow cavity, a radiation source material layer and a phase change material layer are sequentially arranged in the heat preservation shell from top to bottom, and an electric resistance wire is arranged around the phase change material layer; the phase change material layer is used for latent heat energy storage, the electric resistance wire is used for assisting the latent heat energy storage of the phase change material layer, and the radiation source material layer is used for absorbing the energy of the phase change material layer and radiating; the electric resistance wire is wound around the phase change material layer, and the electric resistance wire is spaced from the radiation source material layer; The thickness of the phase change material layer is determined by the following formula: where t is the heating time (s); d P is the thickness of the phase change material (m); C P1 and C P2 are the specific heat capacities of the phase change material in phase 1 and phase 2, respectively (J / (kg·K)); H, L are the specific enthalpy and latent heat of the phase change material, respectively (J / kg); p r and p P are the densities of the radiation source material and the phase change material, respectively (kg / m 3 ); k r is the thermal conductivity of the radiation source material (W / (m·K)); h a is the air convection heat transfer coefficient (W / (m 2 ·K); A r , d r are the upper surface area (m 2 ) and thickness (m) of the radiation source material, respectively; ε r is the surface emissivity of the radiation source material; σ is the Stefan-Boltzmann constant; T P , T a , T r are the temperatures of the phase change material, the environment, and the radiation source, respectively (K); T min and T max are the starting and ending temperatures of the phase change, respectively (K). The radiation plate is used for calibrating and detecting a radiation thermometer.

2. The low power radiation plate according to claim 1, wherein The heat preservation shell is further provided with a temperature sensor, which is used for monitoring the temperature of the phase change material and the radiation source.

3. The low power radiation plate according to claim 2, wherein The temperature sensor comprises a first temperature sensor and a second temperature sensor, the first temperature sensor is arranged on the upper and lower surfaces of the phase change material layer, and the second temperature sensor is arranged on the surface of the radiation source material layer.

4. The low power radiation plate according to claim 3, wherein The number of the first temperature sensor is 1-2, and the number of the second temperature sensor is 2-4.

5. The low power radiation plate according to claim 1, wherein The thickness of the radiation source material layer is 1-2 mm.

6. The low power radiation plate according to claim 1, wherein The material of the heat preservation shell is at least one of glass fiber, asbestos, rock wool, silicate or aerogel felt.

7. The low power radiation plate according to claim 1, wherein The phase change material is one of solid-solid phase change material, solid-liquid phase change material, solid-gas phase change material or liquid-gas phase change material.

8. The low power radiation panel of claim 1, wherein, The upper surface of the radiation source material layer is further provided with a movable heat preservation cover, and the heat preservation cover is connected with the heat preservation shell.

9. A method of reducing power consumption of a radiation source, the method comprising: The method comprises the following steps: (1) placing the phase change material in the heat preservation shell, arranging the electric resistance wire around the phase change material, arranging the first temperature sensor on the upper and lower surfaces of the phase change material, and obtaining the phase change material layer; (2) placing the radiation source material on the phase change material layer, and placing the second temperature sensor on the upper surface of the radiation source material, and obtaining the radiation source material layer; (3) heating the phase change material layer by using the electric resistance wire, stopping heating when the first temperature sensor reaches a first preset temperature, and obtaining the phase change material layer with latent heat energy storage function; the first preset temperature is the phase change temperature of the phase change material; (4) heating the radiation source material layer by using the phase change material layer with latent heat energy storage function until the temperature of the second temperature sensor reaches a required temperature.

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