Audi Q7 e-tron quattro 4M - Page 76

76
Heat pump
The heat pump system has been used in building installations for
years, and now finds its way into the world of Audi automobiles
through the Audi Q7 e-tron quattro. An electric-powered vehicle
develops less waste heat than a vehicle with an internal combus-
tion engine. It is important to make ecient use of the generated
thermal energy. This means there is no need to generate energy
from waste heat, which can be used for heating the cabin. The use
of the heat pump allows the waste heat released by electrical
components to be used for heating the cabin. Waste heat can be
recovered for heating purposes by extending the refrigerant and
coolant circuits. This significantly improves the eciency of the
electric heating system. The heat pump extends the range of the
AudiQ7e-tronquattro. It collects the waste heat from the compo-
nents in the electric driveline and increases the temperature of the
coolant flowing through the heat exchanger. For a detailed descrip-
tion, refer to page 90.
Advantages of the heat pump
Pre-conditioning
Thanks to the electric AC compressor V470 and the high-voltage
heater (PTC)Z115, it is possible to pre-cool the cabin in the
summer and to preheat the cabin in the winter. The heat pump can
subsequently maintain a comfortable temperature of approxi-
mately 22°C without the need for additional heating. This is
possible down to an ambient tempeature of about 0°C. If the
ambient temperature drops below 0 °C, the high-voltage heater
(PTC) Z115 can provide back-up.
Electrical pre-conditioning can be started directly or programmed
for a specific departure time. This function can be operated via the
in-car MMI, via the Audi connect app or via myAudi.
The pre-conditioning function is available irrespective of whether
the vehicle is currently being charged via the charging infrastruc-
ture, or not. A requirement is that the hybrid battery has sucient
charge. A conventional auxiliary heater can be ordered as an
option.
649_136
Audi connect app In-car MMI myAudi
Operating options
The heat pump has another advantage when it comes to prevent-
ing windscreen fogging up in wet weather. With the heat pump, it
is possible to initially cool and dehumidify the intake air and
subsequently to reheat the intake air eciently via the heat pump.
To achieve this, conventional heating systems of electric-powered
vehicles have to consume twice as much energy.
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