What is a Heat Recovery Ventilator?
A Heat Recover Ventilator (HRV) is integrated into the duct work in a home, and is usually located near the furnace. The HRV expels stale indoor air to the outside, and draws in fresh air from outside to be distributed throughout the home.
How does an HRV work?
- Warm stale air from your home is drawn into the HRV.
- Heat from the indoor air is transferred via the unit’s aluminum core to the fresh air stream.
- Stale air is expelled outside, leaving its warmth behind in the HRV’s aluminum core.
- Cool fresh air is drawn into the HRV, and warmed by the heated aluminum core.
- Your entire home is filled with warm, clean, fresh air.
In the summer, the HRV works in reverse. Warm air is expelled and cool air is delivered throughout the home.
How does the heat exchange core effect heat recovery?
Inside an HRV, the heat from the inside air of the home is recovered via the heat exchange core. The efficiency of heat recovery can vary tremendously, and depends primarily on the conductive properties of the heat exchange core.
Aluminum heat exchange cores are the most efficient, with virtually no heat loss in the transfer of heat from outgoing to incoming air. Heat loss is substantially greater in HRVs that feature heat exchange cores made from paper or plastic.