Latent heat storage
A latent heat storage includes a ceramic part, formed of a polycrystalline material, and including a closed space famed therein, and a metal part provided inside the closed space, and including copper.
1 . A latent heat storage comprising:
a ceramic part, formed of a polycrystalline material, and including a closed space formed therein;
a metal part provided inside the closed space, and including copper; and
a heater, embedded in the ceramic part, and configured to heat the metal part via the ceramic part, wherein:
the ceramic part is monolithic, and
the ceramic part includes one of
aluminum oxide at a proportion greater than or equal to 90 mass %,
mullite at a proportion greater than or equal to 90 mass %,
aluminum nitride at a proportion greater than or equal to 95 mass %, and
a mixture of aluminum nitride and boron nitride at a proportion greater than or equal to 95 mass %.
2 . The latent heat storage as claimed in claim 1 , wherein a volume of the closed space is larger than a volume of the metal part.
3 . The latent heat storage as claimed in claim 2 , wherein a volume of the closed space at 25° C. is in a range greater than or equal to 112% and less than or equal to 120% of a volume of the metal part.
4 . The latent heat storage as claimed in claim 1 , wherein the metal part includes copper at a proportion greater than or equal to 99 mass %.
5 . The latent heat storage as claimed in claim 1 , wherein
the ceramic part has a tubular shape including an inner wall surface and an outer wall surface, and
the closed space and the metal part have a spiral shape along the inner wall surface and the outer wall surface.
6 . The latent heat storage as claimed in claim 1 , comprising:
a plurality of pairs of the closed space and the metal part, wherein
the ceramic part is formed with a plurality of through holes extending in a first direction, and
the closed space and the metal part have a columnar shape parallel to the first direction.
7 . The latent heat storage as claimed in claim 1 , wherein
the ceramic part is formed with a plurality of through holes extending in a first direction, and
the closed space and the metal part have a bellows shape extending in a second direction perpendicular to the first direction.
8 . The latent heat storage as claimed in claim 1 , wherein
the ceramic part is formed with a plurality of through holes extending in a first direction, and
the closed space and the metal part have a bellows shape extending in the first direction.
9 . The latent heat storage as claimed in claim 1 , wherein titanium is present between the metal part and the ceramic part.
10 . The latent heat storage as claimed in claim 9 , wherein a mass of the titanium is in a range greater than 0% and less than or equal to 10% of a mass of the metal part.
11 . The latent heat storage as claimed in claim 1 , wherein the heater includes a mixture of tungsten and aluminum oxide, or a mixture of molybdenum and aluminum oxide.
12 . The latent heat storage as claimed in claim 1 , wherein the heater includes one of molybdenum disilicide, ruthenium oxide, a nickel-chromium alloy, and a silver-palladium alloy.
13 . The latent heat storage as claimed in claim 12 , wherein the heater further includes glass.
14 . The latent heat storage as claimed in claim 1 , further comprising:
a thermocouple configured to generate an electromotive force by a temperature change in the metal part.
15 . The latent heat storage as claimed in claim 14 , wherein the thermocouple is provided within the ceramic part.
16 . The latent heat storage as claimed in claim 14 , wherein the thermocouple is provided on a surface of the ceramic part.
17 . The latent heat storage as claimed in claim 14 , wherein the thermocouple includes a tungsten-rhenium alloy.
18 . The latent heat storage as claimed in claim 14 , wherein the ceramic part has a flow path through which a heating medium flows.
19 . The latent heat storage as claimed in claim 1 , wherein:
the ceramic part has a cylindrical shape with a through hole,
the metal part has a columnar shape and is provided inside the through hole, and
the heater embedded in the ceramic part has a shape extending along the columnar shape of the metal part.
20 . The latent heat storage as claimed in claim 19 , wherein the heater has a spiral shape alternately repeating a clockwise turn and a counterclockwise turn when viewed from a direction parallel to a longitudinal axis of the columnar shape of the metal part.