Nu met de lagere temperaturen valt 't me op dat, gevoelsmatig, de verwarming minder snel warm wordt en de ruiten langer nodig hebben om te ontwasemen dan toen ik de auto net had (2018).
Nu lijkt het dat er een elektrische "bijverwarming" op de V50 2.0d zit, onderdeel nr 39 op de tekening (partnumber 9124131) en ben nu aan het twijfelen of deze nog wel (goed) werkt.
Is er een manier om dit deel te testen zonder de hele boel uit te moeten bouwen?
-- Edit --
Inmiddels in VIDA onderstaande informatie gevonden:
PTC element (Positive Temperature Coefficient)
A diesel engine has optimal efficiency and therefore emits very little surplus heat. In cold climates, vehicles with diesel engines therefore use a PTC element as an extra heater. The PTC element means that the passenger compartment can be heated up quickly in low ambient temperatures. This is necessary as the coolant does not emit sufficient heat, particularly during the first minutes after starting the engine. The PTC element is located in the climate control unit after the heat exchanger. The air that flows past the hot PTC element on its way into the passenger compartment is heated directly.
Typical properties for a PTC element are:
- rapid heating immediately after starting
high level of efficiency
lightweight, compact design
cannot overheat
maintenance free
The PTC element comprises small, metal-coated ceramic plates (1) interspersed with radiator elements (2) made of aluminum. These layers are held together in a frame (3) of spring elements. The task of the aluminum elements is to conduct the current at the same time as transferring heat to the airflow.
The maximum output of the PTC element is 1000 W.
The PTC element has a positive heating coefficient. This means that the resistance value is relatively low at low temperatures and increases as the temperature rises.
When the cold PTC element is supplied with power, the current is high in the initial stage and heats up the element. As the temperature rises, the resistance value of the ceramic also rises. As a result, the power consumption falls.
It takes approximately 20 seconds until the stabilization current is reached. The ceramic temperature is dependent on the heat given off and the ambient temperature. In the event of good heat transfer, the temperature falls, as does the resistance. As a consequence, the power consumption and the temperature both rise.
If little heat is given off, the temperature of the ceramic rises, as does the resistance. With this cycle, the heating element regulates its own power consumption. The result is an even balance between electrical energy supplied and heat energy given off.
The climate control module (CCM) checks the function of the PTC element via the central electronic module (CEM). For further information, see Design and Function, climate control module (CCM), and Design and Function, central electronic module (CEM).
