Varmegjenvinningsventilasjon

Varmegjenvinningsventilasjon, often abbreviated as HRV, is a mechanical ventilation system designed to provide fresh air while recovering heat from the outgoing stale air. This system is particularly beneficial in well-insulated buildings where natural ventilation is limited and energy efficiency is a priority. The core principle involves using a heat exchanger to transfer thermal energy from the exhaust air stream to the incoming fresh air stream.

An HRV system typically consists of two fans, one for supply and one for exhaust, and a heat exchanger. The exhaust fan draws stale, warm air from areas like kitchens and bathrooms. This air passes through the heat exchanger. Simultaneously, the supply fan draws fresh, cooler outdoor air into the building. This incoming air also passes through the heat exchanger, but in a separate channel. As the two air streams meet within the heat exchanger, heat is transferred from the warmer exhaust air to the cooler supply air, pre-heating it before it enters the living spaces. This process significantly reduces the energy required to heat the incoming fresh air, leading to lower heating costs.

HRV systems help maintain indoor air quality by continuously ventilating the building, removing pollutants, moisture, and odors. They are an important component of modern, energy-efficient building design, contributing to both comfort and environmental sustainability. While the primary function is heat recovery, some systems may also incorporate filters to remove particulate matter from the incoming air.