Heat exchanger

A heat exchanger comprising:

• a plurality of unit devices, each including:
• a heat exchanger plate;
• a spacer rib for keeping a spacing between the heat exchanger plate and an adjacent heat exchanger plate of an adjacent unit device;
• and
• a shielding rib for shielding leakage of airflow, wherein
• the spacer rib and the shielding rib are made of a resin having water-insolubility and a flame retardant property,
• the heat exchanger plate, the spacer rib and the shielding rib are integrally molded,
• the plurality of unit devices are stacked over each other to form airflow passages between the adjacent heat exchanger plates,
• the heat exchanger plate is made of a moisture permeable resin film having water-Insolubility and a flame retardant property,
• the airflow passages allow a first airflow and a second airflow to pass therethrough and to exchange heat through the adjacent heat exchanger plates, and
• the moisture permeable resin film is a three-layer composite moisture permeable resin film formed by joining a hydrophilic moisture permeable resin film having water-insolubility, a flame retardant property, and a gas shielding property to one surface of a porous resin film having water-insolubility and a flame retardant property, and joining a porous resin substrate having water-insolubility, a flame retardant property, and breathability to a surface of the hydrophilic moisture permeable resin film.

A heat exchanger comprising a plurality of heat exchanging plates stacked on top of each other, wherein each of the heat exchanging plates includes:

• a plurality of first shielding ribs disposed at end portions on a first surface, and a plurality of first spacer ribs disposed within the first shielding ribs, the first spacing ribs and the first shielding ribs disposed in a first direction;
• and
• a plurality of second shielding ribs disposed at end portions on a second surface opposite to the first surface, and a plurality of second spacer ribs disposed within the second shielding ribs, the second spacer ribs and second shielding ribs disposed in a second direction offset from the first direction by a first predetermined angle,
• wherein the heat exchanging plates are stacked on top of each other in alternate directions offset by a second predetermined angle to thereby form first and second airflows which intersect at approximately the second predetermined angle to exchange heat between the heat exchanging plates,
• wherein each of the heat exchanger plates comprises a hydrophilic moisture permeable resin film having water-insolubility, a flame retardant property, and a gas shielding property joined to one surface of a porous resin film having water-insolubility and a flame retardant property, and
• wherein the heat exchanger further comprises a porous resin substrate having water-insolubility, a flame retardant property, and breathability joined to a surface of one of the hydrophilic moisture permeable resin film and the porous resin film.