Abstract: A heat generating device includes a container, a heat generating element, and a heater. A hydrogen-based gas contributing to heat generation is introduced into the container. The heat generating element is provided inside the container. The heater is configured to heat the heat generating element. The heat generating element includes a base made of a hydrogen storage metal, a hydrogen storage alloy, or a proton conductor, and a multilayer film provided on a surface of the base. The multilayer film having a stacking configuration of: a first layer that is made of a hydrogen storage metal or a hydrogen storage alloy, and a second layer that is made of a hydrogen storage metal, a hydrogen storage alloy, or ceramics different from that of the first layer. The first layer and the second layer have a layer shape with a thickness of less than 1000 nm.

Abstract: Provided is a boiler including a heat generation body, a container including the heat generation body, and a water pipe to be heated by heat generated by the heat generation body under environment where the inside of the container is filled with gas with higher specific heat than that of air.

Abstract: A heat generating method includes: heating, with a heater, a heat generating element and causing a first heat generating reaction in which the heat generating element generates heat with a first heat generation amount and triggering a second heat generating reaction in which the heat generating element generates heat with a second heat generation amount larger than the first heat generation amount, by imparting a perturbation to an input power to be applied to the heater in a state where the first heat generating reaction is occurring. The heat generating element includes a base made of a hydrogen storage metal, a hydrogen storage alloy, or a proton conductor, and a multilayer film provided on a surface of the base, with a stacked configuration of a first layer and a second layer made of different materials and both having a thickness of less than 1,000 nm.

Abstract: A heat generating device includes a container, a heat generating element disposed inside the container, a heater for heating the heat generating element, a conductive wire part connecting a wall portion of the container and the heater, a hydrogen supply unit for supplying a hydrogen-containing hydrogen-based gas to the heat generating element, and a vacuum evacuation unit for evacuating the container. Formula (1) is satisfied: AHC?eq(TH?TW)+As?eq?(TS4?TW4)+Pm<Hex ??(1), where TH is heater temperature, TW is external environmental temperature, AHC is equivalent heat conduction area, keq is equivalent thermal conductivity, Leq is equivalent thermal conduction length, AS is sample radiation surface area, TS is sample surface temperature, ?eq is equivalent emissivity, ? is Stefan-Boltzmann constant, Pm is energy required for maintaining operation, Hex is thermal energy generated by the heat generating element, and ?eq is (keq/Leq).

Abstract: A heat generating device includes: a sealed container; a tubular body provided in a hollow portion of the sealed container; a heat generating element provided on an outer surface of the tubular body and configured to generate heat by occluding and discharging hydrogen supplied to the hollow portion; and a flow path formed by an inner surface of the tubular body and through which configured to allow a fluid that exchanges heat with the heat generating element to flow. The heat generating element includes a base made of a hydrogen storage metal, and a multilayer film provided on the base. The multilayer film has a first layer made of a hydrogen storage metal and having a thickness of less than 1000 nm, and a second layer made of a hydrogen storage metal, which is different from that of the first layer, and having a thickness of less than 1000 nm.

Abstract: Provided are a novel heat utilization system and heat generating device that utilize an inexpensive, clean, and safe heat energy source. A heat utilization system 10 includes a heat-generating element 14 configured to generate heat by occluding and discharging hydrogen, a sealed container 15 having a first chamber 21 and a second chamber 22 partitioned by the heat-generating element 14, and a temperature adjustment unit 16 configured to adjust a temperature of the heat-generating element 14. The first chamber 21 and the second chamber 22 have different hydrogen pressures. The heat-generating element 14 includes a support element 61 made of at least one of a porous body, a hydrogen permeable film, and a proton conductor, and a multilayer film 62 supported by the support element 61.

Abstract: Provided is a boiler for heating fluid by a heat generation unit including heat generation bodies in a container, the boiler being able to moderately heat fluid according to various situations while heat generated by the heat generation bodies can be efficiently utilized. A boiler for heating fluid by using heat generated by heat generation bodies includes the heat generation bodies and a container having the heat generation bodies inside and configured such that the inside of the container is filled with gas with higher specific heat than that of air. The boiler includes a controller configured to control a heat generation amount of the heat generation body under a situation where the gas has been supplied into the container.

Abstract: Provided is a boiler configured to perform heating by a heat generation section provided with heat generation bodies in a container and capable of properly charging a circulation path including, as part thereof, the inside of the container with required gas. A boiler includes: heat generation bodies; a container configured such that the heat generation bodies are provided inside and configured chargeable with gas with higher specific heat than that of air; and a circulation path including, as part thereof, the inside of the container, the circulation path being a path in which gas circulates. When the charging process of charging the circulation path with the gas is performed, a circulation amount and a gas concentration in the circulation path are monitored.

Abstract: A heat generating system (1) of the present invention controls an excess heat output from heat-generating element cells (16) that are generating excess heat as a result of the heat generation reaction among the plurality of heat-generating element cells (16) by increasing the number of heat generation reaction positions, and therefore even if the other heat-generating element cells (16) do not generate excess heat due to insufficient heat generation reaction, the heat-generating element cells (16) in which the heat generation reaction is certainly occurring can compensate for insufficient amount of heat to be recovered, thereby capable of stably obtaining heat using the heat-generating element cells (16) each of which generates heat using a hydrogen storage metal or a hydrogen storage alloy.