Passive Preheating of Air for an HRV or ERV
I was watching a video about rooftop solar and how the homeowner/builder had designed the roof so that air passing underneath the solar array would be channeled into the home at the ridge to help heat it in the winter (the air was 20 degrees warmer after passing under the array).
I was wondering if the same concept could be used to heat incoming air for a cold climate HRV or Erv? I know that passive air heaters mounted on the exterior of a house have been around for a while (the air from inside the house enters through a slot at the bottom of the unit, rises between a black metal back-plate and the glass surface and re-enters the house at a higher temperature through a slot at the top) but could such a design be built below the fresh air intake vent for an HRV/ERV to preheat the incoming air?
Basically, it would be a box mounted on a south facing exterior wall with a black metal back plate, a glass front and have an open vent at the bottom to bring in fresh outside air (not indoor) and then the air would be funneled through a slot at the top into the ERV/HRV’s fresh air intake vent.
Think it might work, or is there a device already on the market that passively does this?
GBA Detail Library
A collection of one thousand construction details organized by climate and house part