Värmebärare
Köldmedium
Rumsluft
Uteluft
Förångare
Kondensor 100 °C
22 °C-15 °C
-5 °C-15 °C
55 °C45 °C
Expansionsventil Kompressor
A
D
F
H
I
B
C
E
G
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Värmebärare
Köldmedium
Köldbärare
Värmekälla
Förångare
Kondensor 100 °C
0 °C-3 °C
-2 °C
50 °C40 °C
Expansionsventil Kompressor
A
D
F
H
B
C
E
G
Air
Refrigerant
Evaporator
Condenser
1
3
Tappvarmvatten
Köldmedium
Luft
Förångare
Kondensor 80 °C
22 °C0 °C
5 °C0 °C
55 °C45 °C
Expansionsventil Kompressor
LEK
A
D
F
B
C
E
G
Heating medium
Heat source
CompressorExpansion valve
2
Heat source
Exhaust air module
function
An exhaust air module uses the heat that is in the
building's ventilation air to heat up the house. The con-
version of the ventilation air's energy to residential
heating is done in three different circuits. From the
outgoing ventilation air (1), free heating energy is re-
trieved from the house and transported to the exhaust
air module. The exhaust air module increases the re-
trieved heat's low temperature to a high temperature
in the refrigerant circuit, (2). The heat is distributed
around the building in the heating medium circuit (3).
Ventilation air
The hot air is transferred from the rooms to the heat pump
via the exhaust air module.
A
The fan then routes the air to the exhaust air module's
evaporator. Here, the air releases the thermal energy to
the brine and the air's temperature drops significantly. The
cold air is then blown out of the house.
B
Refrigerant circuit
A liquid, a refrigerant, circulates in a closed system in the
exhaust air module, which also passes the evaporator.
The refrigerant has a very low boiling point. In the evapor-
ator the refrigerant receives the heat energy from the
ventilation air and starts to boil.
C
The gas that is produced during boiling is routed into an
electrically powered compressor. When the gas is com-
pressed, the pressure increases and the gas’s temperature
increases considerably, from approx. 5°C to approx. 80°C.
D
From the compressor, gas is forced into a heat exchanger,
condenser, where it releases heat energy to the heating
system in the house, whereupon the gas is cooled and
condenses to a liquid form again.
E
As the pressure is still high, the refrigerant can pass an
expansion valve, where the pressure drops so that the
refrigerant returns to its original temperature. The refriger-
ant has now completed a full cycle. It is routed to the
evaporator again and the process is repeated.
F
Heat medium circuit
The heat energy that the refrigerant produces in the con-
denser is retrieved by the climate system's water, heating
medium, which is heated to 55 °C (supply temperature).
G
Ventilation
The hot air is transferred from the rooms to the heat pump
via the exhaust air module.
J
The fan then routes the air to the exhaust air module heat
exchanger. Here, the air releases the heating energy to
the brine and the air's temperature drops significantly. The
cold air is then blown out of the house.
K
The temperatures are only examples and may vary between different installations and time of year.
NIBE S135Chapter 2 | The heating installation – the heart of the house6
2 The heating installation – the
heart of the house
