HRV unit function
An HRV unit is a ventilation heat exchanger that utilises the heat in the
building’s ventilation air to heat the incoming outdoor air. From the out-
going ventilation air (1), heating energy is recovered from the dwelling
and transported to the HRV unit. In the heat exchanger (2), the heat from
the indoor air is transferred to the incoming outdoor air.
Ventilation air
The hot air is transferred from the rooms to the HRV unit via the building’s ventilation
system using a fan.
A
In the HRV unit, the air releases heat energy and the temperature drops significantly.
The cold air is then blown out of the building.
B
Outdoor air
The outdoor air is transferred to the HRV unit via the building’s ventilation system.
C
In the HRV unit, the air absorbs the heat energy and the temperature is raised.
D
A fan blows the heated air into those rooms that have supply air inlets.
E
The temperatures are only examples and may vary between different installations and
time of year.
11
Chapter 2 | The heating installation – the heart of the house
NIBE ERS 20
Summary of Contents for ERS 20
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