Heat Recovery Ventilation (HRV), also known as mechanical ventilation heat recovery (MVHR), is an energy recovery ventilation system which works between two sources at different temperatures. Heat recovery is a method which is increasingly used to reduce the heating and cooling demands (and thus energy costs and maintenance) of buildings.
Advances in home technologies and materials offers a number of important human health, energy savings and building maintenance benefits. By recovering the residual heat in the exhaust gas, the fresh air introduced into the air conditioning system is pre-heated (pre-cooled), and the fresh air enthalpy is increased (reduced) before the fresh air enters the room or the air cooler of the air conditioning unit performs heat and moisture treatment.
A typical heat recovery system in buildings consists of a core unit, channels for fresh air and exhaust air, and blower fans. Building exhaust air is used as either a heat source or heat sink depending on the climate conditions, time of year and requirements of the building.
Careful sealing against air leakage is a key factor in design or upgrade to achieve a healthy home environment. Air intake can be filtered inline if the outside air source is polluted. Frequent air exchange ensures common pollutants like radon, formaldehyde, carbon monoxide and particulates found in household air are removed from the home.
- A regular exchange of household air can also reduce common pollutants, humidity and avoid excessive moisture problems like condensation on windows.
- HRVs extract the heat from the outgoing stale air and use it to preheat the incoming fresh air.
- Heat recovery systems typically recover about 60–95% of the heat in exhaust air and have significantly improved the energy efficiency of buildings.
"Advances in home technologies and materials offers a number of important human health, energy savings and building maintenance benefits."
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