Heat storing system

A heat storing system comprising:

• a heat source that generates heat and emits the heat to a first thermal medium;
• and
• a heat storing unit including a heat storing body storing heat, wherein:
• the heat storing unit includes
• a heat storing body container housing the heat storing body, and
• a thermal medium container housing a liquid-state second thermal medium that is evaporated by removing heat of a third thermal medium flowing outside the thermal medium container,
• the heat storing body container is configured to receive vapor of the second thermal medium generated in the thermal medium container,
• the heat storing body has a pore receiving the vapor of the second thermal medium,
• the heat storing body is configured to change to a solid-state first phase when the heat storing body has a temperature not more than a phase transition temperature and change to a solid-state second phase when the heat storing body has a temperature exceeding the phase transition temperature,
• the heat storing body is configured to store or emit heat in accordance with phase change between the first phase and the second phase, and
• the heat storing unit is configured to be switchable between
• a heat storing mode to store heat of the first thermal medium in the heat storing body by heat exchange between the first thermal medium and the heat storing body in the heat storing body container, and
• a cold heat emission mode to cool the third thermal medium by emitting cold heat to the third thermal medium through heat exchange between the liquid-phase second thermal medium and the third thermal medium in the thermal medium container to evaporate the second thermal medium.