Heat storage tank with improved thermal insulation performance

摘要

A heat storage tank includes an inner cylinder 81 having a storage portion 811 for storing a liquid, an opening 812 at a lower position of the storage portion 811, and a body 84 in which a liquid inflow passage 841 and a liquid outflow passage 842 are formed. The body blocks the opening 812. When the inner diameter of the inner cylinder 81 is referred to as a tank inner diameter D and the vertical length of the storage portion 811 is referred to as a tank height H, D / H 0.5. Therefore, the storage section 811 is elongated in the vertical direction and the distance between the body 84, which is a main heat-radiating section, and the high-temperature water area is increased, and as a result, the high-temperature water area in the vertical direction expands.