CN110884240A - Cascaded phase-change cold storage box plate structure, preparation method thereof and cold storage box - Google Patents
Cascaded phase-change cold storage box plate structure, preparation method thereof and cold storage box Download PDFInfo
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- CN110884240A CN110884240A CN201911294974.4A CN201911294974A CN110884240A CN 110884240 A CN110884240 A CN 110884240A CN 201911294974 A CN201911294974 A CN 201911294974A CN 110884240 A CN110884240 A CN 110884240A
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- storage box
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- HCFPRFJJTHMING-UHFFFAOYSA-N ethane-1,2-diamine;hydron;chloride Chemical compound [Cl-].NCC[NH3+] HCFPRFJJTHMING-UHFFFAOYSA-N 0.000 claims 3
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- QLNOVKKVHFRGMA-UHFFFAOYSA-N trimethoxy(propyl)silane Chemical group [CH2]CC[Si](OC)(OC)OC QLNOVKKVHFRGMA-UHFFFAOYSA-N 0.000 claims 1
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- GUAMWERKVJMTGH-UHFFFAOYSA-N N'-benzyl-N-[3-[dimethoxy(prop-2-enoxy)silyl]propyl]ethane-1,2-diamine hydrochloride Chemical compound CO[Si](CCCNCCNCC1=CC=CC=C1)(OC)OCC=C.Cl GUAMWERKVJMTGH-UHFFFAOYSA-N 0.000 description 2
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- XKRPWHZLROBLDI-UHFFFAOYSA-N dimethoxy-methyl-propylsilane Chemical compound CCC[Si](C)(OC)OC XKRPWHZLROBLDI-UHFFFAOYSA-N 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
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- PSUKBUSXHYKMLU-UHFFFAOYSA-N triethoxy-[4-(7-oxabicyclo[4.1.0]heptan-4-yl)butyl]silane Chemical compound C1C(CCCC[Si](OCC)(OCC)OCC)CCC2OC21 PSUKBUSXHYKMLU-UHFFFAOYSA-N 0.000 description 1
Images
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Ceramic Engineering (AREA)
- Packages (AREA)
Abstract
The invention relates to the technical field of cold chain transportation, in particular to a cascade phase change cold storage box plate structure, a preparation method thereof and a cold storage box, wherein the cold storage box plate structure comprises a phase change material plate, a heat insulation plate and a polyurethane plate which are sequentially arranged from inside to outside, the phase change material plate is a composite phase change material plate formed by compounding paraffin and modified silicon dioxide, and the phase change material plate, the heat insulation plate and the polyurethane plate are packaged in a cascade coupling manner; the preparation method of the box board structure has the advantages of simple process and convenience in preparation; the cold storage box adopts the box plate structure, and has the advantages of low overall heat conductivity coefficient, high heat storage density and long heat preservation time.
Description
Technical Field
The invention relates to the technical field of cold chain transportation, in particular to a cascade phase-change cold storage box plate structure, a preparation method thereof and a cold storage box.
Background
With the rapid increase in the demand for frozen foods and pharmaceutical preparations, the development of cold chain transportation has also begun to progress rapidly in recent years. In order to meet the low-temperature requirement of refrigerated transportation in the prior art, most refrigerated transport vehicles, refrigerated tanks, refrigerated cases, ice bags or other temperature control equipment are selected to control the temperature in the transportation process, the refrigerated transport vehicles adopted in the prior art use an active refrigeration mode to regulate and control the temperature, it consumes extra energy, and the cold storage tank, the ice bag and the cold storage box mainly use a thermal protection mode to realize thermal storage and thermal insulation so as to prolong the heat preservation time, and adopt an active refrigeration mode, so that the energy consumption is large, the transportation cost is high, therefore, the conventional refrigeration transportation mainly adopts a thermal protection mode to keep the temperature within an acceptable range, only needs to use off-peak power for cold charging at night, can realize the cold chain transportation of long-time and long-span, have high efficiency, safety, low-cost characteristics, research and optimization this type of cold chain transport case has showing positive effect to the security and the efficiency that improve cold chain transportation.
The cold storage box used in the cold chain transportation at present usually utilizes phase change materials to carry out temperature regulation and control, the phase change materials that present cold storage box chose for use are mostly solid-liquid phase change materials, mainly include two main categories of inorganic matter (inorganic salt, hydrated inorganic salt etc.) and organic matter (alcohol, acid and aliphatic hydrocarbon etc.), compare with inorganic matter phase change energy storage material, organic matter phase change energy storage material not only corrosivity is little, and hardly there is supercooling and split phase shortcoming in the phase transition in-process, but organic matter phase change heat storage material coefficient of heat conductivity is generally lower, poor stability (easy oxidation or high temperature sublimation), there is flammability, thereby heat storage system efficiency and application have been reduced.
In view of the above technical problems, there is a need for a new cool storage box to better solve the above technical problems.
Disclosure of Invention
In order to solve the problems, the invention provides a cascade phase-change cold storage box plate structure, a preparation method thereof and a cold storage box, wherein the box plate structure is simple in structure, reasonable in design, simple in structure and convenient for thermal protection; the cold storage box has long heat preservation time and good use effect; the preparation method is simple, convenient, efficient and safe, has low production cost, and can meet the requirements of industrial production preparation and application.
The technical scheme adopted by the invention is as follows:
the cascading phase change cold storage box plate structure comprises a phase change material plate, a heat insulation plate and a polyurethane plate which are sequentially arranged from inside to outside, wherein the phase change material plate is a composite phase change material plate formed by compounding paraffin and modified silicon dioxide, and the phase change material plate, the heat insulation plate and the polyurethane plate are packaged through cascading coupling.
Further, the surface of the polyurethane board is coated with an aluminum foil layer.
Furthermore, the heat insulation plate is made of a plurality of heat insulation material plates, and air layers are distributed among the heat insulation material plates.
Further, the insulation board is made of any one of extruded polystyrene (XPS), vacuum insulation board (VIP), or polystyrene foam (EPS) material.
Further, the surface of the phase change material plate is packaged by an aluminum foil bag.
The preparation method of the cascade phase-change cold storage box plate structure comprises the following steps:
the method comprises the following steps: assembling a polyurethane plate, namely splicing and assembling the polyurethane plate by using electronic sealant to form an outer-layer packaging structure;
step two: assembling the heat-insulating plate to form a middle-layer heat-insulating structure;
step three: preparing a phase change material plate, namely putting 0.1-1g of organosilane into 100ml of ethanol/water mixed solution with the mass ratio of 1:1, adding 50-100g of silicon dioxide powder, introducing nitrogen, stirring for 20min, filtering, drying the powder to obtain modified silicon dioxide, mixing the prepared modified silicon dioxide and paraffin according to the mass ratio of 1:4, stirring for 1h at a constant speed of 1000r/min in a stirrer to obtain a paraffin/modified silicon dioxide composite phase change material, preparing the paraffin/modified silicon dioxide composite phase change material into the phase change material plate, and placing the phase change material plate on the innermost layer;
step four: and carrying out cascade coupling packaging on the prepared polyurethane plate, the insulation plate and the phase change material plate to obtain a cascade phase change cold storage box plate structure for cold chain transportation.
Further, the air conditioner is provided with a fan,
in the first step, after the polyurethane boards are spliced and assembled into the outer-layer packaging structure of the box body, the inner surface and the outer surface of the box body are required to be covered with an aluminum foil layer;
in the second step, air between the plates does not need to be exhausted when the heat preservation structure is assembled;
in the third step, preparing the paraffin/modified silicon dioxide composite phase change material plate, packaging the composite phase change material plate by using an aluminum foil bag, and then performing vacuum compression to obtain the phase change material plate.
Further, in step three, the organosilane is 3-aminopropylmethyldimethoxysilane, 3-aminopropylmethyldiethoxysilane, N-2-aminoethyl-3-aminopropylmethyldiethoxysilane, N- (2-aminoethyl) -3-aminopropylmethyldimethoxysilane, 3-divinyltriaminopropylmethyldimethoxysilane, N-benzyl-N '- [3- (trimethoxysilyl) propyl ] ethylenediamine hydrochloride, vinylbenzylaminoethylaminopropyltrimethoxysilane hydrochloride, 3-mercaptopropylmethyldiethoxysilane, 3-glycidyloxypropyltriethoxysilane, 2- (3, 4-epoxycyclohexylethyl) ethyltriethoxysilane, vinylmethyldimethoxysilane, N-propylmethyldiethoxysilane, N-propylmethyldimethoxysilane, N-benzyl-N' - [3- (trimethoxysilyl) propyl ] ethylenediamine hydrochloride, N-benzylaminoethylaminoethyltrimethoxysilane hydrochloride, 3-mercaptopropylmethyld, Any one or more of n-dodecyl trimethoxy silane, n-hexadecyl trimethoxy silane and 3-methacryloxypropyl tris (trimethylsiloxy) silane; the paraffin wax is any one or more of paraffin wax with the melting point of-10 ℃, 5 ℃, 0 ℃, 5 ℃ and 10 ℃.
The utility model provides a cold storage box, includes box and case lid, is equipped with the storage tank in the box, box and case lid are formed by a plurality of cascade type phase transition cold storage box plate structure concatenations as above-mentioned respectively, and the case lid adopts the gomphosis structure to be connected with the box.
Further, the whole cold storage box comprises, by volume percentage, 5.4% -6.1% of the polyurethane plate, 5.3% -5.9% of the heat insulation plate, 15.6% -16.1% of the composite phase change material plate, and 73.7% -71.9% of the accommodating groove.
The invention has the following beneficial effects:
1. the invention relates to a cascade phase change cold storage box plate structure, which comprises a phase change material plate, a heat insulation plate and a polyurethane plate which are sequentially arranged from inside to outside, wherein the phase change material plate is a composite phase change material plate formed by compounding paraffin and modified silicon dioxide, the phase change material plate, the heat insulation plate and the polyurethane plate are packaged in a cascade coupling manner, the structure is simple, the design is reasonable, an external polyurethane plate is used for supporting the whole structure, the mechanical strength is improved, and the heat insulation effect is realized, the middle heat insulation plate is used for carrying out heat insulation and heat preservation, the internal composite phase change material plate is made of a paraffin/modified silicon dioxide composite phase change material and is mainly used for heat storage and heat preservation, the problems of large volume expansion and liquid fluidity during paraffin phase change are solved by the modified silicon dioxide packaging, the integral heat conductivity coefficient of the material is reduced, the, the problem that supercooling and phase separation are easy to occur exists, the requirement of cold storage temperature range of cold chain storage and transportation is met, the phase change material plates and the heat insulation plates are overlapped, the heat conductivity coefficient is reduced, large latent heat storage capacity is obtained, the heat insulation time is prolonged remarkably, and the high efficiency, energy conservation and environmental protection of cold chain transportation are realized.
2. The preparation method of the box board structure is simple, convenient, efficient, safe, easy to prepare, low in production cost and high in application feasibility, and can meet the industrial production requirement.
3. The cold storage box comprises a box body and a box cover, wherein the box body is internally provided with a containing groove, the box body is formed by splicing a plurality of cascade phase change cold storage box plate structures, the box cover is connected with the box body by adopting an embedded structure, the overall heat conductivity coefficient is low, the heat storage density is high, the effective loading capacity is high, the heat preservation time in a required temperature range is as long as more than 72 hours, and the cold storage box has wide application prospects in the field of cold chain transportation in the aspects of medicines, foods and the like.
Drawings
FIG. 1 is a schematic view of the construction of the boxboard of the present invention;
description of reference numerals: 1. phase change material plate, 2, insulation board, 3, polyurethane board.
Detailed Description
The reagents, equipment and methods employed in the present invention are those conventionally available in the art and those conventionally used, unless otherwise specified, and the present invention will be further described with reference to the accompanying drawings and preferred embodiments.
Example 1
Referring to fig. 1, the cascade phase change cold storage box plate structure according to the embodiment includes a phase change material plate 1, a heat insulation plate 2 and a polyurethane plate 3 which are sequentially arranged from inside to outside, the phase change material plate 1 is a composite phase change material plate 1 formed by compounding paraffin and modified silica, and the phase change material plate 1, the heat insulation plate 2 and the polyurethane plate 3 are packaged in a cascade coupling manner; the intermediate heat-insulation board 2 is made of a low-heat-conduction heat-insulation material for heat insulation; inside composite phase change material board 1 is as the coolant by paraffin/modified silica composite phase change material, mainly used heat accumulation keeps warm, modified silica encapsulation has solved the volume inflation when paraffin phase transition and liquid mobility problem, the whole coefficient of heat conductivity of material has been reduced simultaneously, it is low to effectively solve cold-storage agent phase transition latent heat, there is the supercooling phenomenon and takes place the phase separation scheduling problem easily, thereby reach the cold-stored temperature scope requirement of cold chain storage and transportation, in addition, phase change material board 1 and heated board 2 stack, not only the coefficient of heat conductivity has been reduced, and great latent heat storage capacity has been obtained, thereby the extension heat preservation time that is showing, realize the high efficiency of cold chain transportation, energy-conservation and environmental protection.
Specifically, in this embodiment, the surface of the polyurethane board 3 is coated with an aluminum foil layer, and more specifically, the thickness of the aluminum foil layer is 0.2cm, so that the mechanical strength of the box board structure can be improved by coating the aluminum foil layer.
Specifically, in this embodiment, the insulation board 2 is made of a plurality of insulation boards, air layers are distributed among the insulation boards, and the air layers among the insulation boards can serve as air thermal resistance to improve the overall insulation effect.
Specifically, in this embodiment, the heat insulation board 2 is made of any one of extruded polystyrene (XPS), vacuum heat insulation board 2(VIP) or polystyrene foam (EPS) material, and in this embodiment, the heat conductivity coefficient of the selected heat insulation material is low, so that heat can be effectively isolated, the heat flux of the wall surface of the box body can be reduced, and the heat insulation effect can be enhanced.
Specifically, in this embodiment, the surface of the phase change material plate 1 is encapsulated by the aluminum foil bag, and the aluminum foil bag encapsulates the surface of the phase change material plate, so that the heat transfer effect in the box board structure is not affected while the encapsulation structure is stable.
The preparation method of the cascade phase-change cold storage box plate structure described in this embodiment includes the following steps:
the method comprises the following steps: splicing and assembling the polyurethane plate 3 by using electronic sealant to form a box body outer layer packaging structure of the cold storage box, and covering an aluminum foil layer on the inner surface and the outer surface, specifically, selecting the polyurethane plate 3 with the side length of 1.8m and the thickness of 1.8cm, splicing and assembling by using the electronic sealant to form an outer layer packaging structure, and covering an aluminum foil layer with the thickness of 0.2cm on the inner surface and the outer surface to improve the mechanical strength;
step two: assembling a plurality of heat insulation materials together to form a heat insulation plate 2, and then loading the heat insulation plate 2 into the box body outer layer packaging structure in the first step, specifically, selecting a plurality of square extruded polystyrene (XPS) plates with the side length of 1.764m and the thickness of 1.8cm from the heat insulation plate 2, wherein air between plates of the extruded polystyrene (XPS) plates does not need to be removed during assembly, and the air between the plates can be used as air thermal resistance to improve the overall heat insulation effect;
step three: preparing a phase change material plate 1, firstly putting 0.1-1g of organosilane into 100ml of ethanol/water mixed solution with the mass ratio of 1:1, adding 50-100g of silicon dioxide powder, introducing nitrogen and stirring for 20min, filtering and drying the powder to obtain modified silicon dioxide, mixing the prepared modified silicon dioxide and paraffin according to the mass ratio of 1:4, stirring for 1h at the constant speed of 1000r/min in a stirrer to obtain a paraffin/modified silicon dioxide composite phase change material, then preparing the paraffin/modified silicon dioxide composite phase change material into the composite phase change material plate 1, and placing the composite phase change material plate 1 in the innermost layer, wherein the organosilane is 3-aminopropylmethyldimethoxysilane, 3-aminopropylmethyldiethoxysilane, N-2-aminoethyl-3-aminopropylmethyldiethoxysilane, N-2-aminopropylmethyldiethoxysilane, One or more of N- (2-aminoethyl) -3-aminopropylmethyldimethoxysilane, 3-diethylenetriaminopropylmethyldimethoxysilane, N-benzyl-N' - [3- (trimethoxysilyl) propyl ] ethylenediamine hydrochloride, vinylbenzylaminoethylaminopropyltrimethoxysilane hydrochloride, 3-mercaptopropylmethyldiethoxysilane, 3-glycidoxypropyltriethoxysilane, 2- (3, 4-epoxycyclohexyl) ethyltriethoxysilane, vinylmethyldimethoxysilane, N-dodecyltrimethoxysilane, N-hexadecyltrimethoxysilane and 3-methacryloxypropyltris (trimethylsiloxy) silane; the organosilane selected in this embodiment can infiltrate the surface of the silica, modify the silica, increase the adsorption capacity of the silica to the paraffin, and increase the enthalpy of phase change of the composite material, wherein the paraffin preferably has a melting point of-10 ℃, -5 ℃, 0 ℃, 5 ℃, and 10 ℃ or a combination of one or more of the paraffins; the paraffin phase-change material selected in the embodiment has the advantages of large latent heat of phase change and low supercooling degree, so that the paraffin phase-change material has excellent heat storage and heat preservation capacity and temperature control functions, more specifically, the paraffin melting point is 5 ℃, the thickness of an aluminum foil bag is 0.2mm, the paraffin phase-change material is packaged and then compressed in vacuum to form a square composite phase-change material plate 1 with the side length of 1.728m and the thickness of 5.4cm, the square composite phase-change material plate 1 is arranged on the innermost layer of a cold storage box,
step four: and (3) carrying out cascade coupling packaging on the prepared polyurethane plate 3, the insulation plate 2 and the phase change material plate 1 to obtain a cascade phase change cold storage box plate structure for cold chain transportation.
Adopt cold-storage box of above-mentioned cascade phase change cold-storage box plate structure, including box and case lid, be equipped with the storage tank in the box, box and case lid are constituteed by the concatenation of a plurality of foretell cascade phase change cold-storage box plate structure respectively, and the case lid adopts the gomphosis structure to be connected with the box, and the cold-storage box in this embodiment adopts the gomphosis structure on the apron, and outstanding part can be used to strengthen the box leakproofness, and its reasonable in design, the whole coefficient of heat conductivity of cold-storage box is low, heat accumulation density is big, the heat preservation.
Specifically, the whole cold storage box comprises, by volume percentage, 5.4% -6.1% of polyurethane plates 3, 5.3% -5.9% of heat insulation plates 2, 15.6% -16.1% of composite phase change material plates 1 and 73.7% -71.9% of accommodating grooves, and the cold storage box is good in heat insulation effect, high in effective loading capacity and wide in application prospect in the field of cold chain transportation in the aspects of medicines, foods and the like.
Example 2
The melting point of the paraffin wax in this example was-5 ℃ based on example 1.
Example 3
On the basis of embodiment 1, the insulation board 2 in this embodiment is assembled by selecting a plurality of vacuum insulation boards 2.
Example 4
On the basis of embodiment 1, in this embodiment, six polyurethane boards 3 with a side length of 2m and a thickness of 2cm are selected and assembled by using an electronic sealant to form an outer layer packaging structure, and the inner and outer surfaces are covered with aluminum foils with a thickness of 2mm to improve the mechanical strength.
The cold storage tanks manufactured in examples 1 to 4 were subjected to performance tests, and the test results are shown in table 1:
table 1 performance data of cold storage tanks
As can be seen from the table I, the cold storage box disclosed by the invention is low in overall heat conductivity coefficient and high in heat storage density, has the heat preservation time of more than 72 hours in a required temperature range, and has wide application prospects in the field of cold chain transportation in the aspects of medicines, foods and the like.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. The cascading type phase change cold storage box plate structure is characterized by comprising a phase change material plate, a heat insulation plate and a polyurethane plate which are sequentially arranged from inside to outside, wherein the phase change material plate is a composite phase change material plate formed by compounding paraffin and modified silicon dioxide, and the phase change material plate, the heat insulation plate and the polyurethane plate are packaged through cascading type coupling.
2. The cascaded phase-change cold storage box plate structure as claimed in claim 1, wherein the surface of the polyurethane plate is coated with an aluminum foil layer.
3. The structure of the cascade phase-change cold storage box plate according to claim 1, wherein the heat preservation plate is made of a plurality of heat preservation material plates, and air layers are distributed among the heat preservation material plates.
4. The cascaded phase change cold storage box plate structure of claim 3, wherein the insulation board is made of any one of extruded polystyrene (XPS), vacuum insulation board (VIP) or polystyrene foam (EPS) material.
5. The cascaded phase-change cold storage box plate structure of claim 1, wherein the surface of the phase-change material plate is encapsulated by aluminum foil bags.
6. The method for preparing a cascade phase-change cold storage box plate structure according to any one of claims 1 to 5, characterized by comprising the following steps:
the method comprises the following steps: assembling a polyurethane plate, namely splicing and assembling the polyurethane plate by using electronic sealant to form an outer-layer packaging structure;
step two: assembling the heat-insulating plate to form a middle-layer heat-insulating structure;
step three: preparing a phase change material plate, namely putting 0.1-1g of organosilane into 100ml of ethanol/water mixed solution with the mass ratio of 1:1, adding 50-100g of silicon dioxide powder, introducing nitrogen, stirring for 20min, filtering, drying the powder to obtain modified silicon dioxide, mixing the prepared modified silicon dioxide and paraffin according to the mass ratio of 1:4, stirring for 1h at a constant speed of 1000r/min in a stirrer to obtain a paraffin/modified silicon dioxide composite phase change material, preparing the paraffin/modified silicon dioxide composite phase change material into the phase change material plate, and placing the phase change material plate on the innermost layer;
step four: and carrying out cascade coupling packaging on the prepared polyurethane plate, the insulation plate and the phase change material plate to obtain a cascade phase change cold storage box plate structure for cold chain transportation.
7. The method for preparing a cascaded phase-change cold storage box plate structure according to claim 6,
in the first step, after the polyurethane boards are spliced and assembled into the outer-layer packaging structure of the box body, the inner surface and the outer surface of the box body are required to be covered with an aluminum foil layer;
in the second step, air between the plates does not need to be exhausted when the heat preservation structure is assembled;
in the third step, preparing the paraffin/modified silicon dioxide composite phase change material plate, packaging the composite phase change material plate by using an aluminum foil bag, and then performing vacuum compression to obtain the phase change material plate.
8. The method for preparing a cascaded phase-change cold storage box plate structure as claimed in claim 6, wherein in step three, the organosilane is 3-aminopropylmethyldimethoxysilane, 3-aminopropylmethyldiethoxysilane, N-2-aminoethyl-3-aminopropylmethyldiethoxysilane, N- (2-aminoethyl) -3-aminopropylmethyldimethoxysilane, 3-diethylenetriaminopropylmethyldimethoxysilane, N-benzyl-N ' - [3- (trimethoxysilyl) propyl ] ethylenediamine hydrochloride, vinylbenzylaminoethyl aminopropyltrimethoxysilane hydrochloride, 3-mercaptopropylmethyldiethoxysilane, 3-glycidyloxypropyltriethoxysilane, N-tert-butyl-N ' -methyl-3- (trimethoxysilyl) propyl ] ethylenediamine hydrochloride, N-benzyl-N ' -ethyl-3- (trimethoxysilyl) propyl ] ethylenediamine hydrochloride, N-benzyl-aminoethyl-aminopropyltrimethoxysilane hydrochloride, N-mercaptopropylmethyldiethoxysilane, N-glycidyl-ethoxypropyl-triethoxysilane, Any one or more of 2- (3, 4-epoxycyclohexyl) ethyltriethoxysilane, vinylmethyldimethoxysilane, n-dodecyltrimethoxysilane, n-hexadecyltrimethoxysilane and 3-methacryloxypropyltris (trimethylsiloxy) silane; the paraffin wax is any one or more of paraffin wax with the melting point of-10 ℃, 5 ℃, 0 ℃, 5 ℃ and 10 ℃.
9. A cold storage box comprises a box body and a box cover, wherein a containing groove is formed in the box body, and the cold storage box is characterized in that the box body and the box cover are respectively formed by splicing a plurality of cascade phase change cold storage box plate structures according to any one of claims 1 to 5, and the box cover is connected with the box body by adopting an embedded structure.
10. The cold storage box according to claim 9, wherein the polyurethane plate accounts for 5.4-6.1%, the insulation plate accounts for 5.3-5.9%, the composite phase change material plate accounts for 15.6-16.1%, and the accommodating groove accounts for 73.7-71.9% by volume of the whole cold storage box.
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