The defining feature is direct air heating: outdoor air is drawn across and through a sun-warmed, micro-perforated metal surface before entering an air-handling or process system.
← All insightsA sun-facing metal absorber captures short-wave solar radiation. A fan in the connected air-handling system draws outside air uniformly through a field of small perforations. As the air approaches and crosses the warm surface, heat is transferred into the supply airflow. This avoids a water loop and an additional liquid-to-air heat exchanger for the basic ventilation preheating application.
Collector efficiency is not a fixed number. Academic work by Dymond and Kutscher (Solar Energy, 1997) specifically investigates flow distribution and warns that poor distribution can reduce performance. The position of the intake, collection plenum and fans, as well as perforation geometry, therefore belong in the engineering design.
A field study of an actual SolarWall transpired collector by Fleck and colleagues (Solar Energy, 2002) investigated wind effects. Performance depends on the climate, panel orientation, solar absorptivity, suction velocity and the temperature requirement. A higher temperature rise is not automatically the same as higher annual useful energy.
For an operating system, measure irradiance, outside-air temperature, collector outlet temperature, airflow and operating hours. A common first-order sensible heat estimate is Q = ρ × V̇ × cₚ × (T_out − T_ambient), with consistent units. This is a measured thermal contribution, not by itself a fossil fuel bill saving.
This content is an editorial synthesis of published information, not a product datasheet, certified whitepaper or site-specific engineering recommendation.
