HRV

Heat Recovery Ventilation

Our heat recovery system exhausts stale, moist air and brings in fresh, dry air while recycling the heat from the exhaust stream. This can recover as much as 70% of heating energy otherwise lost to ventilation. We can also re-capture waste heat from the shower drains. A heat/energy recovery ventilator provides a constant supply of tempered, filtered, fresh air. Using this “fresh air” heating and cooling system not only saves space-conditioning costs by “recycling” indoor energy, it also provides excellent indoor air quality and consistent comfort.

Heat recovery ventilation (HRV) is one component of a passive house system. The passive house system is a very well insulated, virtually airtight building that is primarily heated by passive solar and internal heat gains from occupants, cooking, bathing, or electrical equipment. The passive house standard is the highest building efficiency standard in the world, with the promise of reducing the energy consumption of buildings by up to 80% while providing superior comfort and air quality—all at minimized additional upfront cost. When coupled with renewable energy systems, such as solar, using passive heating and cooling puts true “zero-energy” buildings within reach. If you are interested in the entire system, please look into adding on the following elements to your OHome, OClass, or OHousing designs.

Environmental Benefits

Heat recovery ventilation systems lower the monthly utility bills by reducing electric and gas use at the point of consumption. Due to the inefficiency of energy production and transmission, the small amount of electricity that is saved at the home reduces a larger amount of produced power demand at the power plant, thus reducing the demand for electrical power plants. Fewer required power plants means less air and water pollution as well as a reduction in the environmental impacts of resource extraction.

Health and / or Social Benefits

Indoor air can be 2 to 5 times more polluted than outdoor air; therefore, most heating, ventilation and air-conditioning (HVAC) system designers understand that increased amounts of outdoor air supply is generally better for indoor air quality. Life inside today’s tight home generates both moisture and pollutants. The moisture comes from cooking, washing, showers, and breathing. At excessive levels, moisture condenses on windows and can cause structural deterioration. Areas of excessive moisture are also breeding grounds for mold, mildew, fungi, dust mites, and bacteria. You know you have a problem if you find moisture collecting on your windows, or if you notice black spots on walls. These unsightly spots indicate mildew growth. Mold spores and dust easily become airborne and circulate freely throughout the house, possibly causing a range of symptoms and allergic reactions.

Economic Benefits

Depending on the model, heat recovery ventilation systems can recover up to 85 % of the heat in the outgoing airstream, making these ventilators a lot easier on your budget than opening a few windows. And, they contain filters that keep particulates such as pollen or dust from entering the house.

Heating, Ventilation and Air-Conditioning (HVAC) Systems
U.S. Department of Energy Website 

How It Works: Heat Recovery Ventilator
Popular Mechanics Website