Heat exchanger, heat recovery ventilator including the same, and method for defrosting and checking operations thereof

A heat exchanger comprising:

• a plurality of stacked heat exchange elements;
• support plates attached to the top and bottom surfaces of said stacked heat exchange elements;
• and
• connection members attached to the respective corners of said stacked heat exchange elements,
• wherein each of said heat exchange elements comprises:
• a heat exchange surface spacer member having a plurality of first flow paths arranged in parallel to each other;
• and
• a pair of heat exchange element spacer members attached to the upper surface of the heat exchange surface spacer member so as to be spaced apart from each other,
• a second flow path is formed between the pair of heat exchange element spacer members along a direction perpendicular to the first flow paths,
• wherein the plurality of heat exchange elements are formed of corrugated cardboard, and the plurality of first flow paths are formed by the corrugations of the corrugated cardboard,
• wherein each of heat exchange element spacer members is formed by closing both ends of the corrugated cardboard and bending both ends of the corrugated cardboard along cutting lines spaced from the respective closed ends and positioned perpendicular to the flow direction of the plurality of first flow paths.