Heat recovery ventilator

A heat exchanger, comprising:

• a housing, the housing defining:
• a first airflow chamber through which a first airflow is directed;
• and
• a second airflow chamber through which a second airflow is directed;
• and
• a heat recovery wheel disposed in the housing and rotatable about a wheel axis, the heat recovery wheel including:
• a wheel rim defining an outer perimeter of the heat recovery wheel;
• and
• a plurality of wheel passages located between the wheel rim and the wheel axis, the plurality of wheel passages arranged in a plurality of radial layers relative to a wheel central axis, each layer defined by:
• a first shaped material having a first cross-sectional shape;
• and
• a second shaped material assembled to the first shaped material, the second shaped material having a second cross-sectional shape;
• wherein the first shaped material is secured directly to the second shaped material;
• and
• wherein the plurality of wheel passages are configured for flow of a first airflow and a second airflow therethrough for thermal energy exchange between the first airflow and the second airflow;
• wherein at least one of the first shaped material or the second shaped material includes a hydrophilic coating.