CN217178989U

CN217178989U - Cooling and fresh-keeping container based on radiation refrigeration film

Info

Publication number: CN217178989U
Application number: CN202221103429.XU
Authority: CN
Inventors: 吴陶; 郑华; 卢拓; 李华丹
Original assignee: Dongguan University of Technology
Current assignee: Dongguan University of Technology
Priority date: 2022-05-09
Filing date: 2022-05-09
Publication date: 2022-08-12
Anticipated expiration: 2032-05-09

Abstract

The utility model provides a cooling and fresh-keeping container based on a radiation refrigeration film, which comprises a heat insulation container cavity and a radiation refrigeration film top cover; the radiation refrigeration film top cover comprises a radiation refrigeration film and a transparent sheet for supporting the radiation refrigeration film. The utility model provides a container can be under the condition that need not plus electric power to inside the container cool down and realize the fresh-keeping function of efficient to have convenient to carry, advantage such as light in weight is applicable to the application that food medicine keeps fresh and preserve the transportation.

Description

Cooling and freshness-retaining container based on radiation refrigeration film

Technical Field

The utility model belongs to the technical field of the cooling is fresh-keeping, especially, relate to a cooling preservation container based on radiation refrigeration film.

Background

The food and medicine fresh-keeping technology is an important link for ensuring the food and medicine safety in the modern fast-paced life and plays an irreplaceable role in ensuring the food and medicine quality. However, the common food and medicine container only has the function of sealing and dust prevention, and can not effectively ensure the food and medicine not to deteriorate and maintain the quality of the food and medicine. Most foods (such as meat, dairy products, vegetables, fruits), medicines (such as insulin, vaccines and the like) and flowers (such as roses, narcissus and the like) need to be refrigerated and kept fresh, especially in the process of transportation and storage.

At present, two methods, namely a refrigerator and a sealed preservation box, are mainly adopted for preserving food by using food and medicine preservation technologies which are commonly used. The food and medicine of the refrigerator has strong fresh-keeping capability and obvious cooling effect, so the refrigerator is widely applied. The refrigerator must use electric energy to achieve the purpose of temperature reduction and freshness preservation through the operation of the refrigerator, so that huge electric energy consumption is needed to be unfavorable for environmental protection. Meanwhile, the refrigerator needs refrigeration equipment and a thick heat insulation layer, so that certain requirements are met on the size of the refrigerator, and the refrigerator cannot be portable in size. Compared with the prior art, the sealed preservation box is a container for hermetically preserving food and medicine in a fixed volume, and reduces the oxidation speed of the food and the medicine and the probability of contacted microorganisms by isolating the relative circulation of air inside the container and outside, thereby achieving the purpose of preservation. The volume and the appearance of the sealed preservation box can be customized, the limitation is small, the sealed preservation box is suitable for being carried outdoors, and the sealed preservation box is one of the mainstream modes of food and medicine preservation at present. The temperature in the container of a common sealed preservation box is greatly influenced by the outside, and when the temperature is too high in hot summer, food and medicine are easy to deteriorate due to the fact that the temperature is too high. In order to further improve the fresh-keeping capacity of the sealed fresh-keeping box, in recent years, a vacuumizing fresh-keeping box and a heat-insulating fresh-keeping box have appeared, the two means can effectively ensure the constant temperature inside the container, the external influence is relatively small, and the fresh-keeping effect is still different from that of a refrigerator. The oxidative deterioration of food and medicine is greatly influenced by temperature, and a container which can realize the cooling and the fresh keeping of food at high efficiency is still lacked at present.

In recent years, in order to realize preservation by cooling and portability, the design of a novel preservation container has become a research focus and attracts much attention. The core of the research is how to realize cooling and isolation from the outside on a portable preservation container so as to realize the function of effective preservation. At present, various new container designs based on different types of materials and structures have been proposed, including insulation design containers based on tin metal materials, insulation container designs based on vacuum environment. These designs show wide prospects in future applications. The fact proves that the tin metal container and the vacuum container can not cool the interior of the tin metal container and the vacuum container, and the effect of food and medicine preservation is limited.

In recent years, the concept and characteristics of radiation refrigeration by nanostructures and metamaterials have been extensively studied and experimentally demonstrated. It has been determined that by this radiant cooling technique, more heat can be dissipated to the external space without the need for electricity. However, radiation refrigeration technology has not been used in the design of food and pharmaceutical fresh-keeping containers.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a fresh-keeping container of cooling based on radiation refrigeration film, the utility model provides a fresh-keeping container of cooling can lightly carry, need not the energy consumption alright realize the cooling to the container is inside to promote its fresh-keeping ability.

The utility model provides a cooling and fresh-keeping container based on a radiation refrigeration film, which comprises a heat insulation container cavity and a radiation refrigeration film top cover;

the radiation refrigeration film top cover comprises a radiation refrigeration film and a transparent sheet for supporting the radiation refrigeration film.

Preferably, the heat-insulating container cavity is a double-layer vacuum sealing cavity, a foam plastic heat-insulating cavity or a heat-insulating coating cavity.

Preferably, the foam plastic type heat preservation and insulation cavity is a polystyrene foam plastic heat preservation and insulation cavity, a polyurethane foam plastic heat preservation and insulation cavity or a polyethylene glycol terephthalate foam plastic heat preservation and insulation cavity.

Preferably, the volume of the heat insulation container is 0.01-600L.

Preferably, the radiation refrigeration film top cover is combined with the heat insulation container cavity through a hinge, a buckle, a zipper, a gland, a spiral cover, a turned edge or a silica gel sealing ring.

Preferably, the cooling and refreshing container based on the radiation refrigeration film is also provided with a temperature detection component and a temperature display component.

Preferably, the temperature detection part is a thermocouple or a thermometer.

Preferably, the transparent sheet for supporting the radiation refrigeration film is a polyethylene transparent sheet or an acrylic transparent sheet.

Preferably, the shape of the heat-insulating container cavity is a cylinder, a circular truncated cone, a cube, a prismatic table, a pyramid, a cone, a sphere, an ellipsoid or a spherical table.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a cooling and refreshing container based on a radiation refrigeration film according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a cooling and refreshing container based on a radiation refrigeration film according to another embodiment of the present invention;

fig. 3 is a schematic structural view of a cooling and refreshing container based on a radiation refrigeration film according to another embodiment of the present invention;

fig. 4 is a schematic structural diagram of a cooling and refreshing container based on a radiation refrigeration film according to another embodiment of the present invention;

in fig. 1-4, 1 is a radiation refrigeration film top cover, 2 is a heat insulation container cavity;

FIG. 5 is a line graph of the humidity inside and outside the test container for an experimental radiant cooling film during the afternoon hours; in fig. 5, a curve a represents the internal humidity, and a curve b represents the external humidity;

FIG. 6 is a line graph of the internal and external temperature of the experimental radiation refrigeration film test container during the afternoon hours; in fig. 6, curve a is the internal thermocouple temperature, curve b is the external thermocouple temperature, curve c is the internal thermometer temperature, and curve d is the external thermometer temperature;

FIG. 7 is a line graph of the inside and outside humidity of the experimental radiant cooling film test container during the nighttime period; in fig. 7, a curve a represents the internal humidity, and a curve b represents the external humidity;

FIG. 8 is a line graph of internal and external temperature of the experimental radiation refrigeration film test container during the night; in fig. 8, curve a is the internal thermocouple temperature, curve b is the external thermocouple temperature, curve c is the internal thermometer temperature, and curve d is the external thermometer temperature;

FIG. 9 is a schematic front view of a radiation-cooled container prototype;

FIG. 10 is a schematic side view of a radiation-cooled container prototype;

fig. 11 is a schematic top view of a radiation refrigeration container prototype, and fig. 9 to 11 show a transparent sheet layer 1, a buckle 2, a temperature display part 3, a heat insulation container cavity 4, a radiation refrigeration film 5, and a silica gel sealing ring 6;

FIG. 12 is a line graph of the internal and external temperature profiles of a prototype radiant cooler vessel; in fig. 12, curve a represents the external ambient temperature and curve b represents the prototype in-machine temperature;

fig. 13 is a line diagram showing the inside and outside humidity of the prototype container of the radiation refrigeration container, in fig. 13, a curve a represents the outside environment humidity, and a curve b represents the inside humidity of the prototype.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

The utility model discloses in, the heat insulating container cavity can be arbitrary geometric shape, like cylinder, round platform, cube, terrace with edge, pyramid, circular cone, spheroid, ellipsoid or ball platform.

The heat insulation container cavity can be a double-layer vacuum sealing cavity, a foam plastic heat insulation cavity or a heat insulation coating cavity; wherein the foam plastic type heat preservation and insulation cavity is a polystyrene foam plastic heat preservation and insulation cavity, a polyurethane foam plastic heat preservation and insulation cavity or a polyethylene glycol terephthalate foam plastic heat preservation and insulation cavity; the heat insulation coating cavity can be a reflection heat insulation coating cavity or a heat insulation coating cavity.

The utility model discloses in, the volume of insulated container cavity is preferred 0.01 ~ 600L, and more preferred 1 ~ 500L is most preferred, 10 ~ 100L.

The utility model discloses in, radiation refrigeration film top cap is including radiation refrigeration film and transparent sheet, transparent sheet need have certain intensity to be used for supporting radiation refrigeration film.

In the novel use, the radiation refrigeration film has the function of radiating heat inside the container to the outer space in the form of infrared electromagnetic waves through a radiation refrigeration technology to realize a cooling effect. The radiation refrigerating film is a radiation refrigerating film commonly used in the art, or a commercially available radiation refrigerating film conventional in the art. The transparent sheet is preferably a polyethylene transparent sheet (PE) or an acrylic transparent sheet, and the transparent sheet can support the radiation refrigeration film on one side or both sides.

The utility model discloses in, radiation refrigeration film top cap with the heat insulating container cavity passes through hinge, buckle, zip fastener, gland, spiral cover and seals, the turn-up seals, the line of rolling seals or silica gel sealing washer with the heat insulating container cavity combines.

In the utility model, the temperature-reducing and fresh-keeping container is also provided with a temperature detecting component and a temperature display component; the temperature detection component can be a thermocouple, a liquid thermometer or a solid thermometer; the temperature display means may be an electronic display device or a non-electronic display device (such as a liquid thermometer or a solid thermometer) for cooperating with a thermocouple.

Preferably, in the utility model discloses, the fresh-keeping container of cooling still is provided with the temperature and causes phase change material, the material that changes phase according to specific temperature value, for example the change of solid to liquid or the change of specific crystalline phase. The material responds to a certain temperature value. Whether the temperature is higher than a certain temperature value can be known by observing the phase state. The temperature value is usually set according to the food and medicine to be preserved.

The design principle is as follows:

the temperature inside the container is lowered by radiating heat towards the outside sky, according to its radiant power density per unit area (P, determined by the nature of the radiant cooling film itself and by the weather conditions, generally used in W m ^-2 ) The total refrigeration power of which is controlled by its surface area (S) to be

E＝P×S

While controlling the volume (V) of the container to control the volume to be refrigerated. The refrigeration capacity per volume is therefore:

Pv＝E/V

this controls the final cooling temperature. At present, according to an application example, 3-5 ℃ can be realized in daytime (the ambient temperature is 35 ℃, and the illumination intensity is 626W/m) ² Humidity 60% RH) can be realized at 5-8 deg.C in the evening (at 33 deg.C, and illuminance 423W/m ² Humidity 65% RH).

The utility model discloses well fresh-keeping container's of cooling use sight:

although the radiation refrigeration container also has a certain cooling effect indoors, the cooling effect is limited because the heat energy cannot be directly radiated to the outer space. Therefore, can show that the utility model discloses the use scene of the advantage of cooling preservation container is in the open air, and its surface radiation refrigeration membrane is just to the condition in sky, like the container (including food and medicine) at the tool bogie transportation, the cutlery box of picnic etc..

In order to design a more efficient radiation refrigeration film container, it is necessary to know the process of heat preservation and temperature reduction, and in the process, when the thermal insulation performance of the container is relatively good enough, the inside and outside temperature difference Δ T of the sealed container is the most important parameter for evaluating the graphene radiation refrigeration film sealed container:

wherein the initial temperature of the air inside the container and the outside air is T _out The final temperature is T _in The heat absorbed by light absorption and heat conduction is Q ₁ Heat quantity of heat conduction radiation is Q ₂ The film radiates to the outer space with heat Q ₃ (Q is positive for increasing temperature and negative for decreasing temperature), the specific heat capacity of the stored object is c, and for example, air (c is 1.004kJ/(kg · K) (in a normal air state)) m is a mass.

It can be seen from equation (1) that a temperature reduction in the sealed container can be achieved when the film radiates more heat to the outer space than the container absorbs. Therefore, the cooling performance of the design is improved by the following means: 1) the air exchange inside and outside the container is isolated, the heat exchange is prevented, 2) the heat absorption is reduced, including the reduction of light absorption and the heat conduction absorption of a container medium, 3) the radiated heat is increased, and the radiation working efficiency of the film is high under the conditions of lower humidity and clear sky.

The key function of the efficient radiation refrigeration film container is that the film radiates to the outer space through electroless refrigeration under the condition of not consuming other energy, so that the function of cooling is realized. Because the power of the radiation refrigeration film is fixed, a good heat preservation and insulation medium is needed.

In order to reduce the temperature of the radiation refrigeration film, the utility model builds a foam closed container with the volume of 5.6L, and wraps the foam surface with the thickness of 2.5cm by using an aluminum foil with the thickness of 14 μm, thereby having better heat insulation effect; the upper surface of the film is sealed by using a 100-micron PE film, and the PE film is transparent, light and thin, so that the attenuation of the film to the outer space radiation is reduced; after a 10cm x 10cm film is placed in the middle of the container, sealing is carried out, and then a paperboard with an air layer is used for separating the experimental device from the ground so as to reduce heat conduction from the ground; the experiment was carried out in an environment where the film was not blocked toward the sky.

In order to measure the cooling capacity of the radiation refrigeration film at different time points, a mijia bluetooth hygrothermograph 2 (instrument error is 0.1 ℃ and 1% RH) using millet and a Xinxite thermocouple HT-9815 (instrument error is +/-0.1 ℃) are used for measuring at two time points of 17 pm and 20 pm in Beijing of Dongguan city, Guangdong province, probes of the hygrothermograph and the thermocouple are respectively placed inside and outside a closed container, the internal temperature and the external temperature are recorded every 60s, and the obtained data are processed to obtain graphs (shown in figures 6 and 7).

The experimental result shows that the strength of the cooling capacity is gradually enhanced from night to afternoon; the cooling capacity is strongest in afternoon, and the internal temperature can be reduced by 4.9 ℃ compared with the external temperature in one hour. By analysis, at night, due to the fact that the film is in the Guangdong, belongs to tropical and subtropical zones, and is close to rivers, lakes and seas, the humidity is high, particularly, the humidity rises suddenly at night, and therefore the process that heat is radiated to outer space is weakened due to the fact that a large number of water molecules are in the air when the film is radiated. Experiments show that the radiation refrigeration film has good non-electric radiation refrigeration performance.

In order to prove the feasibility of using the radiation refrigeration film for commercial products, the utility model discloses the structure of the prototype machine that constructs the radiation refrigeration film sealed container is shown as figure 9 ~ 11, can be carried by the individual, realizes electroless radiation refrigeration fresh-keeping food, medicine etc.. Radiation refrigeration vessel in prototype (200mm × 140mm × 16 mm): the heat insulating layer is manufactured by the wall thickness of 20mm, the middle interlayer is a three-layer polyurethane heat insulating layer with the structure of 15mm, the container under the design can isolate the heat conduction between the outside and the inside of the container as far as possible, the aluminum foil is attached to the inner surface of the container, the radiation refrigerating capacity is 4.256L, and the capacity of keeping the internal environment of the container is further improved by adding the aluminum foil to the inner wall of the container. Radiation refrigeration top cap: the radiation refrigeration film (150mm multiplied by 200mm) is clamped by the two layers of acrylic plates with the thickness of 10mm after being reformed, the structure can improve the mechanical hardness of the film as much as possible on the premise of not reducing the power of the radiation refrigeration film as much as possible, the bearing capacity of a prototype can be greatly improved, and the requirement of vacuumizing can be conveniently met under some special conditions.

In order to verify the radiation refrigeration capacity of the prototype, the performance of the prototype was verified in an outdoor environment at four noon in eastern Guangguan, Guangdong, China, at day 10 and day 3, the above-mentioned prototype experiment was used as a standard experiment for comparison, and the temperature changes inside and outside the radiation refrigeration container were observed using a thermocouple in Xinxite and a millet Mijia Bluetooth hygrothermograph 2, with the errors of the instruments being ± 0.1 ℃ and 1% RH, respectively. Data were taken every 1min for the first hour and every 5 min for the next three hours. After the data was acquired, the data was rendered into images using origin software, as shown in fig. 9, 10, and 11.

According to the data of the prototype testing, the temperature in the prototype is always lower than the outside temperature within 4 hours, the maximum temperature difference is close to 5 ℃ in about 20 minutes, the temperature difference in the whole process is almost kept lower than the outside environment temperature by more than 2 ℃, and the temperature difference between the inside and the outside gradually expands along with the time. Because the latitude of the experimental place is lower, so the water molecule in the air is more, the humidity is always more than 60RH percent, the humidity in the radiation refrigeration container prototype can be basically maintained to be 10RH percent lower than the external humidity, and the humidity presents a gradually rising state near night. The solar illuminance during the experiment was 626W/m ² 。

In summary, the feasibility of the present patent is verified by the test results of the radiation refrigeration prototype, and it has been proved that the design of the container based on the radiation refrigeration film can achieve effective refrigeration effect without active refrigeration methods such as consuming energy and adding refrigerant. The use of the low-cost radiation refrigeration container can save a large amount of refrigeration energy, greatly reduce carbon emission, relieve greenhouse effect, play a significant role in the realization process of carbon neutralization targets, and have great development prospects. In addition, the work provides a promising idea, and electroless radiation cooling can be carried out in a closed container so as to realize preservation and transportation of food, medicines and flowers.

Claims

1. A cooling and refreshing container based on a radiation refrigeration film is characterized by comprising a heat insulation container cavity and a radiation refrigeration film top cover;

2. The cooling and refreshing container based on the radiation refrigeration film as claimed in claim 1, wherein the heat insulation container cavity is a double-layer vacuum sealing cavity, a foam plastic type heat insulation cavity or a heat insulation coating cavity.

3. The cooling and refreshing container based on the radiation refrigeration film as claimed in claim 2, wherein the foam plastic type heat preservation and insulation cavity is a polystyrene foam plastic heat preservation and insulation cavity, a polyurethane foam plastic heat preservation and insulation cavity or a polyethylene terephthalate foam plastic heat preservation and insulation cavity.

4. The cooling and refreshing container based on the radiation refrigerating film as claimed in claim 3, wherein the volume of the heat insulating container is 0.01-600L.

5. The cooling and refreshing container based on radiation refrigerating film as claimed in claim 4, wherein said radiation refrigerating film top cover is combined with said heat insulating container cavity by means of hinge, snap, zipper, gland, screw cap, curling or silica gel sealing ring.

6. The cooling and refreshing container based on the radiation refrigerating film as claimed in claim 5, wherein the cooling and refreshing container based on the radiation refrigerating film is further provided with a temperature detecting component and a temperature displaying component.

7. The cooling and refreshing container based on radiation refrigerating film as claimed in claim 6, wherein said temperature detecting means is a thermocouple or a thermometer.

8. The cooling and refreshing container based on the radiation refrigerating film as claimed in claim 7, wherein the transparent sheet for supporting the radiation refrigerating film is a polyethylene transparent sheet or an acrylic transparent sheet.

9. The cooling and refreshing container based on the radiation refrigeration film as claimed in any one of claims 1 to 8, wherein the shape of the cavity of the heat insulation container is a cylinder, a circular truncated cone, a cube, a truncated pyramid, a cone, a sphere, an ellipsoid or a truncated sphere.