Thermal-insulation container

Abstract

Thermal-insulation container 1, comprising a bottom 26, side walls 21, 22, 23, 24 arranged on the bottom 26 and a lid 25 arranged on the side walls 21, 22, 23, 24, wherein the bottom 26, the side walls 21, 22, 23, 24 and the lid 25 completely enclose an interior space 3, and wherein the lid 25 has a heat transfer coefficient k.sub.D, the bottom 26 has a heat transfer coefficient k.sub.B, and each of the side walls 21, 22, 23, 24 has one of the heat transfer coefficients k.sub.S1, k.sub.S2, k.sub.S3 or k.sub.S4, and further k.sub.D<minimum [k.sub.S1, k.sub.S2, k.sub.S3, k.sub.S4, k.sub.B].

Claims

1. Thermal-insulation container, comprising a bottom, side walls arranged on the bottom and a lid arranged on the side walls, wherein the lid comprises at least two vacuum insulation panels, said vacuum insulation panels being arranged stacked on top of each other, wherein the bottom, the side walls and the lid completely enclose an interior space, and wherein the lid has a heat transfer coefficient k.sub.D, the bottom has a heat transfer coefficient k.sub.B, and each of the side walls has one of the heat transfer coefficients k.sub.S1, k.sub.S2, k.sub.S3 or k.sub.S4, and further k.sub.D<k.sub.B<minimum [k.sub.S1, k.sub.S2, k.sub.S3, k.sub.S4] and further comprising at least two pedestals coupled to the bottom such that the bottom does not directly contact a ground on which the container is placed.

2. Thermal-insulation container according to claim 1, wherein k.sub.D<0.8 in particular 0.6*minimum [k.sub.S1, k.sub.S2, k.sub.S3, k.sub.S4, k.sub.B].

3. Thermal-insulation container according to claim 1, wherein the bottom, the side walls and the lid each comprise at least one vacuum insulation panel.

4. Thermal-insulation container according to claim 1, wherein the bottom, the side walls and the lid are made of the same material or of different material, and wherein the lid is designed thicker than the bottom and each of the four side walls.

5. Thermal-insulation container according to claim 1, comprising at least two vacuum insulation panels with different heat transfer coefficients.

6. Thermal-insulation container according to claim 1, further comprising an additional insulation element.

7. Thermal-insulation container according to claim 6, wherein the additional insulation element is arranged in the bottom.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) FIG. 1 shows a schematic sectional view of a first thermal-insulation container; and

(2) FIG. 2 shows a schematic sectional view of a second thermal-insulation container.

DETAILED DESCRIPTION

(3) It is advantageous if k.sub.D<k.sub.B<minimum [k.sub.S1, k.sub.S2, k.sub.S3, k.sub.S4]. The low heat transfer coefficient k.sub.B of the bottom is chosen in such a way to protect against increased heat flux density caused, for example, by contact of the bottom with the ground on which the thermal-insulation container is placed.

(4) A thermal-insulation container, where k.sub.D<0.8 in particular 0.6*minimum [k.sub.S1, k.sub.S2, k.sub.S3, k.sub.S4, k.sub.B], is particularly advantageous.

(5) According to another advantageous aspect, the bottom, the four side walls and the lid each include at least one vacuum insulation panel. A vacuum insulation panel thereby has a thermal conductivity of less than 9 mW/mK, in particular less than 5 mW/mK, especially preferably less than 3.5 mW/mK.

(6) It is preferred if the lid comprises at least two vacuum insulation panels, whereby the vacuum insulation panels are arranged stacked on top of each other. In this way, a lower heat transfer coefficient k.sub.D of the lid can be easily realized.

(7) A thermal-insulation container, wherein the bottom, the four side walls and the lid are made of the same material, is also preferred. In this context, the lid is designed thicker than the bottom and each of the four side walls. As a result, a lower heat transfer coefficient k.sub.D of the lid can be realized in another simple way.

(8) A thermal-insulation container comprising at least one pedestal, which is placed on the bottom, is especially preferred. The at least one pedestal is designed and arranged on the bottom in such a way that the bottom of the thermal-insulation container does not come into direct contact with the ground when the thermal-insulation container is placed on a ground. This reduces the heat flux over the bottom.

(9) In the following, the invention will be explained in more detail using the examples shown in the attached drawings. Identical reference signs concern the same features in all figures.

(10) FIG. 1 and FIG. 2 show a thermal-insulation container 1, which comprises a bottom 26, four side walls 21, 23 [22, 24; the front and rear walls are not shown in this illustration] and a lid 25 arranged on the side walls. The bottom 26, the four side walls 21, 23 and the lid 25 thereby completely enclose an interior space 3.

(11) In this context, the lid 25 has a heat transfer coefficient k.sub.D=0.083 W/(m.sup.2*K), the bottom 26 has a heat transfer coefficient k.sub.B=0.143 W/(m.sup.2*K), and each of the side walls 21, 23 has one of the heat transfer coefficients k.sub.S1=k.sub.S2=k.sub.S3=k.sub.S4=0.166 W/(m.sup.2*K).

(12) Therefore, k.sub.D<k.sub.B<minimum [k.sub.S1, k.sub.S2, k.sub.S3, k.sub.S4] applies. The particularly low heat transfer coefficient k.sub.D of the lid 25 is chosen in such a way to protect against a particularly high heat flux density, which for example is caused by solar radiation acting on the top surface 251 of the lid 25. The low heat transfer coefficient k.sub.B of the bottom 26 is chosen in such a way to protect against an increased heat flux density which for example is caused by contact of the bottom 26 with the ground on which the thermal insulation container 1 is placed.

(13) The shown thermal-insulation containers 1 comprise two pedestals 5, which are arranged at the bottom 26. The pedestals 5 reduce the heat flux over the bottom 26 when the thermal-insulation container 1 is placed on a ground, because the bottom 26 does not come into direct contact with the ground.

(14) According to another advantageous aspect, the bottom 26, the four side walls 21, 23 and the lid 25 each comprise at least one vacuum insulation panel 4. While in FIG. 1 the lid 25 comprises two vacuum insulation panels 4 arranged stacked on top of each other, in FIG. 2 the lid 25 comprises a vacuum insulation panel 4a which is designed thicker than the vacuum insulation panels 4 of the bottom 26 and each of the four side walls 21, 23. In both inventive embodiments, an optimized heat transfer coefficient k.sub.D of the lid 25 can be easily realized in this way. Each of the vacuum insulation panels 4 shown thereby has a thermal conductivity of less than 9 mW/mK, in particular less than 5 mW/mK, especially preferably less than 3.5 mW/mK.