Heat utilization system and heat generating device

A heat utilization system comprising:

• a sealed container into which a hydrogen-based gas is supplied;
• a heat generating structure that is accommodated in the sealed container and includes a heat generating element that is configured to generate heat by occluding and discharging hydrogen contained in the hydrogen-based gas;
• a combustion device that is configured to combust fuel and combustion air to generate heat;
• and
• a heat utilization device that is configured to preheat the combustion air by using the heat of the heat generating element, wherein
• 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 the base, and
• the multilayer film has a first layer made of a hydrogen storage metal or a hydrogen storage alloy and having a thickness of less than 1000 nm and a second layer made of a hydrogen storage metal or a hydrogen storage alloy, which is different from that of the first layer, or ceramics and having a thickness of less than 1000 nm.

A heat generating device comprising:

• a sealed container into which a hydrogen-based gas is supplied;
• and
• a heat generating structure that is accommodated in the sealed container and in which a plurality of heat generating elements that are configured to generate heat by occluding and discharging hydrogen contained in the hydrogen-based gas are radially arranged, wherein
• each of the plurality of heat generating elements includes a base made of a hydrogen storage metal, a hydrogen storage alloy, or a proton conductor, and a multilayer film provided on the base, and
• the multilayer film has a first layer made of a hydrogen storage metal or a hydrogen storage alloy and having a thickness of less than 1000 nm and a second layer made of a hydrogen storage metal or a hydrogen storage alloy, which is different from that of the first layer, or ceramics and having a thickness of less than 1000 nm.