Adsorber

An adsorber comprising:

• a closed container in which an adsorption medium is included;
• an adsorptioner that is provided in the closed container and includes an adsorbent, which adsorbs and desorbs the adsorption medium;
• and
• an evaporator/condenser that is provided in the closed container and that exchanges heat between the adsorption medium and a heat exchanging medium, which is supplied from outside of the closed container, to evaporate and condense the adsorption medium, wherein:
• the evaporator/condenser includes a heat transfer surface that transfers heat of the heat exchanging medium to the adsorption medium;
• the heat transfer surface is capable of holding the adsorption medium, an amount of which is capable of being adsorbed by the adsorbent of the adsorptioner;
• the heat transfer surface is a porous heat transfer body, and
• a relationship of a first passage space<a second passage space<a third passage space is satisfied where:
• the first passage space is a space of a first passage formed by a plurality of clearances formed in the heat transfer surface;
• the second passage space is a space of a second passage, wherein the adsorption medium, which has flowed through the first passage, flows through the second passage immediately after the first passage;
• and
• the third passage space is a space of a third passage, wherein the adsorption medium, which has flowed through the second passage, flows through the third passage immediately after the second passage.