| 摘要 |
PROBLEM TO BE SOLVED: To solve the problem in which a groove portion for arrangement of a heat radiation pipe is provided linearly along the vertical direction, and therefore, when the heat radiation pipe is provided vertically in meander, a vacuum heat insulation material cannot be provided in an inside of a storage at a turning portion of the heat radiation pipe.SOLUTION: A first groove portion 104 and a second groove portion 105 provided on a surface of the vacuum heat insulation material 103 are crossed, and the grooves are provided in ends in the vertical and the horizontal direction. Consequently, a covering area of a vacuum heat insulation material 103 can be increased to further improve heat insulation properties. That is, the vacuum heat insulation material can be provided in an inside of a storage at a turning portion of a heat radiation pipe 111 to further improve heat insulation properties. |
