THERMALLY INSULATED BOX, REFRIGERATOR INCLUDING THERMALLY INSULATED BOX, AND HOT WATER STORAGE APPARATUS INCLUDING THERMALLY INSULATED BOX

摘要

A heat insulating box (1) is provided with: an outer box (2); an inner box (3); and a vacuum heat insulating material (6) and hard urethane foam (5), which are filled into the space (4) formed between the outer box (2) and the inner box (3). The filling factor of the vacuum heat insulating material (6) in the space (4) is 40% to 80%, the ratio of the area of the vacuum heat insulating material (6) to the area of the surface of the outer box is 60% or more, and the bending elastic modulus of the hard urethane foam (5) is 15.0 MPa or higher.