Energy Recovery Ventilation (ERV) is a ventilation system that helps improve indoor air quality while minimising energy losses in buildings. It achieves this by transferring heat and moisture between the incoming and outgoing air streams, reducing the energy required for heating or cooling fresh air.
In an ERV system, stale or exhaust air is expelled from the building while fresh outdoor air is brought in. The heat and moisture from the outgoing air are transferred to the incoming air through a heat exchanger. This transfer of energy helps pre-condition the incoming air, either by recovering heat from the exhaust air in cold weather or removing heat and moisture from the incoming air in hot and humid climates.
The primary component of an ERV system is the heat exchanger, typically known as the energy recovery ventilator. This heat exchanger allows the transfer of thermal energy and humidity between the two air streams while maintaining their separation.
The benefits of an ERV system include improved indoor air quality by providing fresh air and reducing pollutants, enhanced energy efficiency by minimizing the heating and cooling load, and better humidity control by transferring moisture between the air streams.
ERV systems are particularly effective in climates with extreme temperatures, high humidity, or both. They are commonly used in residential, commercial, and institutional buildings where a balance between energy efficiency and indoor air quality is desired.
It is important to note that proper installation, sizing, and maintenance of the ERV system are crucial to ensure its optimal performance and longevity. Regular cleaning of filters and maintenance of the heat exchanger help maintain efficiency and air quality.