JP2014020775A - Cold reserving facility - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to prevent convection heat, radiation heat from the sun, or temperature changes from affecting the inside temperature of a cold reserving facility such as a prefab refrigerator, a cooling box, or a cold reserving metal container that is often used under a sever outdoor environment to cold reserve food products such as vegetables, fruits, seafood, and meats or chemical compounds such as resins.SOLUTION: A material 3 having a high reflectance to radiation heat such as monolayer or multilayer aluminum foil is inserted between an exterior material 4 and an inner material 1 of a cold reserving facility.

Description

  TECHNICAL FIELD The present invention relates to a prefabricated refrigerator for keeping foods such as vegetables, fruits, seafood and meat, and chemical substances such as resin at a low temperature, a cold storage room, or a cold storage facility such as a metal container requiring cold storage. .

Many vegetables and fruits are stored at 0 ° C. or higher, and refrigerators are used for these purposes. In addition, meat, fish, and the like are often stored frozen at 0 ° C. or lower, and cold storage is often used for these applications.
These cold insulation equipments are used as refrigerators and freezers by manufacturing a heat insulating panel in which both sides of a heat insulating material are enclosed by a resin panel or the like and assembling it into a box shape.

Japanese Patent Application No. 4-347971 Japanese Patent Application No. 7-240694

Problems to be solved by the invention

Therefore, there were the following problems.
As for any product, quality assurance is the most important. For this purpose, it is necessary to keep the room temperature constant. However, these cold insulation facilities are often used in harsh outdoor environments, and convective heat from the wind, radiant heat from the sun, or temperature changes due to temperature have a great influence on the indoor temperature.

From these conditions, in order to stabilize the temperature in the cold insulation equipment, it is an important point how to reduce the heat input and output on both sides of the heat insulating panel. For this reason, generally a foaming heat insulating material etc. are inserted between the exterior material and the interior material to prevent heat transfer.
However, the purpose of these heat insulating materials is to slow down the way heat is transmitted, and once the heat is absorbed by the heat insulating material, most of the heat enters the room over time. This tendency is strong in cold storage facilities used in harsh outdoor environments, and it is very difficult to stabilize the indoor temperature.

In addition, if the heat insulating material is thickened, a certain amount of electric power can be reduced, but this time, there are problems such as high production costs and a small internal volume.
The present invention has been made to solve these problems.

Means for solving the problem

  This is a cold insulation facility in which a material having a high reflectivity with respect to radiant heat such as a single layer or multiple layers of aluminum foil is provided between the exterior material and the interior material.

  This is a cold insulation facility in which a material having high reflectivity with respect to radiant heat such as aluminum foil is attached to the outer wall surface side of the interior material and the inner wall surface side of the exterior material.

  A perspective view in which one layer of a material having high reflectivity with respect to radiant heat such as aluminum foil is provided between the interior material and the exterior material.   A perspective view of a single layer of highly reflective material for radiant heat, such as aluminum foil, on the outer wall surface of the interior material

The best mode for carrying out the present invention will be described below.
Most of the radiant heat from the sun, the convection heat from the wind, or the conduction heat from the atmosphere is absorbed by the exterior material 4 of the cold insulation equipment. This heat takes the form of conduction heat, convection heat, and radiant heat and enters the interior material 1 again.
One factor that does not cause convection is that the distance between two adjacent surfaces is 40 millimeters or less. Therefore, if it is less than this interval, it will suffice to consider conduction heat and radiation heat.

  In the present invention, a material 3 having a high reflectance with respect to radiant heat, such as a single layer or multiple layers of aluminum foil, is provided between the exterior material 4 and the interior material 1.

  By making the space between the exterior material 4 and the interior material 1 and the material 3 having high reflectivity with respect to radiant heat such as aluminum foil, a static air layer 2 can be formed, and heat transfer due to convection is prevented. I can do it.

  By setting the distance between the exterior material 4 and the interior material 1 and the material 3 having a high reflectivity with respect to radiant heat such as aluminum foil to 20 mm or more, the influence of conduction heat can be reduced.

  For the radiant heat having the largest amount of heat, the material 3 having a high reflectivity with respect to the radiant heat such as aluminum foil has a reflectivity of 97 to 98%, so that most of the radiant heat is returned to the irradiated direction. It will be a thing.

  In this way, the material 3 having high reflectivity with respect to radiant heat, such as aluminum foil, is provided between the exterior material 4 and the interior material 1, and the distance between them is set to about 20 to 40 millimeters, whereby the still air layer 2 is formed. The heat transfer between the exterior material 4 and the interior material 1 can be greatly reduced.

  Needless to say, more heat transfer can be achieved by providing multiple layers of the material 3 having high reflectivity with respect to the radiant heat of the aluminum foil while providing a still air layer 2 of 20 to 40 millimeters between the exterior material 4 and the interior material 1. Can be prevented.

  When it is desired to further reduce the thickness of the wall, it is also possible to use the exterior material 4 or the interior material 1 by directly attaching the material 3 having high reflectivity against radiant heat such as aluminum foil. For example, when the room temperature of the cold insulation facility is minus 10 ° C., the heat moves from the outdoors toward the cold insulation facility throughout the year. In such a case, radiant heat from the exterior material 4 can be prevented by attaching the material 3 having high reflectivity to the aluminum foil radiant heat on the outer wall surface of the interior material 1.

  Furthermore, it is also possible to provide a material 3 having a high reflectivity with respect to the radiant heat of the aluminum foil between the interior material 1 and the exterior material 4 and further attach the material 3 to the outer wall surface side of the interior material 1. In this way, the wall thickness can be significantly reduced.

  Not only wall surfaces but also aluminum foil such as doors, etc., where material 3 having a high reflectivity against radiant heat is applied is sealed.

  If the exterior material 4 or the interior material 1 is used in contact with the material 3 having a high reflectance with respect to radiant heat such as aluminum foil, it is easily affected by conduction heat. Therefore, as a method for solving this problem, as shown in the figure, the exterior material 4, the interior material 1 or the aluminum foil or the like is used for the material 3 having high reflectivity with respect to the radiant heat and the spacer 5 such as hard urethane having a low thermal conductivity. Is non-contact.

Effect of the invention

  A still air layer 2 of 20 millimeters is provided between the exterior material 4 and the interior material 1 to provide one layer of a material 3 having high reflectivity with respect to radiant heat such as aluminum foil, and is further attached to the outer wall surface side of the interior material 1. By this, it is possible to produce performance equivalent to 100 mm of hard urethane. Thereby, volumetric efficiency can be improved significantly.

  Experiments have confirmed that vegetables are kept fresh for a long time when radiant heat is cut. In particular, leafy vegetables and the like can maintain twice the freshness. In other words, the deterioration of food greatly depends on the amount of radiant heat. Since the refrigeration equipment according to the present invention emits radiant heat at several percent, maintaining the freshness of vegetables, fruits and the like dramatically improves.

  It can also be used for metal containers for transportation that require cold storage.

DESCRIPTION OF SYMBOLS 1 Interior material 2 Still air layer 3 Aluminum foil etc. material with high reflectivity with respect to radiant heat 4 Exterior material 5 Spacer

Claims (2)

  A cold insulation facility in which a material having a high reflectivity with respect to radiant heat, such as a single layer or multiple layers of aluminum foil, is provided between the exterior material and the interior material.   A cold insulation facility in which a material with high reflectivity for radiant heat, such as aluminum foil, is attached to the outer wall surface of the interior material and the inner wall surface of the exterior material.

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