Heat exchange element and manufacturing method thereof, heat exchanger, and heat exchange ventilator

A manufacturing method of a heat exchange element in which sheet-like partition members added a moisture absorbent thereto and spacing members are stacked alternately, the spacing members being joined with the partition members so as to form a flow passage group constituted by a plurality of flow passages together with the partition members, each of the spacing members includes a plurality of section walls that divide a space between the partition member joined under the spacing member and the partition member joined on the spacing member into a plurality of flow passages, the manufacturing method comprising:

• a unit manufacturing step of obtaining a plurality of element-constituting units each having the partition member and the spacing member joined to the partition member;
• and
• a layer stacking step of joining the element-constituting units to each other to obtain a heat exchange element in which a plurality of the element-constituting units are joined one another, wherein
• one or more first section walls formed with holes and one or more second section walls formed with no hole are alternately arranged in each of the spacing members.

A heat exchange ventilator including a supply ventilation passage, an exhaust ventilation passage intersecting with the supply ventilation passage, a supply air blower arranged in the supply ventilation passage, an exhaust air blower arranged in the exhaust ventilation passage, and a heat exchanger arranged at an intersection between the supply ventilation passage and the exhaust ventilation passage, in which the heat exchanger includes a heat exchange element and a box-like frame body accommodating the heat exchange element, wherein

• the heat exchange element has a stacked-layer structure in which sheet-like partition members added a moisture absorbent thereto and spacing members are stacked alternately, the spacing members being joined with the partition members so as to form air flow passages together with the partition members,
• the frame body includes a top plate member covering an upper surface of the heat exchange element, a bottom plate member covering a lower surface of the heat exchange element, and four rectangular frame portions that are located between the top plate member and the bottom plate member to border the heat exchange element,
• each of the spacing members includes a plurality of section walls that divide a space between the partition member joined under the spacing member and the partition member joined on the spacing member into a plurality of flow passages, and
• one or more first section walls formed with holes that bring adjacent flow passages into communication with each other and one or more second section walls formed with no hole that brings adjacent flow passages into communication with each other are alternately arranged in each of the spacing members.