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Heat pump

When ordering a new electric car, it's easy to get into trouble if the question arises, heat pump yes or no. Because in the simple variants it is usually not standard. An additional cable is included with Hyundai for 1,400 €. This is also available alone for 400 €, the heat pump unfortunately not.

The cable is intended for external three-phase AC charging when there is only one socket, which is pretty pointless for us. Because we would either charge single phase on the occasion or DC at the end of the driving day with the battery still warm. But we chose this car because we don't necessarily want to go long-distance with it.

Now you can of course ask why the nonsense with the € 6,500 for the larger battery? Quite simply, our solar panels have reached the age of 20 at some point and then only a small amount will be paid for the kilowatt hour generated. And instead of buying expensive rechargeable home batteries, we chose the large battery.

However, the Kona Electric cannot yet charge back. But not all VWs either. The German Federal Office of Economics and Export Control insisted that the wall boxes subsidized with 900 € must at least be prepared for drawing electricity from the car. This harbors the hope of somehow being able to realize something like this in years to come. This offers the hope of somehow being able to realize something like this years from now.

Of course, we're not buying a wall box just yet, but maybe when it really has the required capability. We are looking for an ICCB, which Hyundai also offers, by the way. We had mistakenly thought that this was the one mentioned above in connection with the wall box. No, you have to buy it additionally for 700 €.

And if such things weren't affordable online for less than 500 €, we might have ordered it. The have the plug for high-power current, for which we already have a connection in the garage. Three-phase charging with 11 kW, normal up to 80 percent, before larger tours up to 100 percent, is completely sufficient. And we can also take it with us, possibly in the accessory frunk with a volume of 39 liters for around 40 €.

So now the heat pump is becoming more and more distant, among other things due to an unnecessary cable for 400 €. However, we had given up on it anyway because a heat pump is only worthwhile under certain conditions. Check out the video below!

What is that, a heat pump? Before we come to the inverted principle of the refrigerator or the air conditioning system, first of all a look at a sub-function that certainly does not exist in the two applications mentioned, e.g. at Tesla a switch that can change eight different connections at the same time.

The reason for this is extremely simple. There are different areas in an electric car that can either get too hot or too cold. This doesn't just mean the interior, but e.g. the battery, the motor or even the control. If the requirements are different depending on the system, it makes sense to help both at the same time by connecting them.

So you save here by not heating one place and cooling another at the same time, because both of course cost energy and thus range. This is really completely different from the combustion engine, which actually always had too much of one thing, namely heat.

It could be that a pump is needed already for the tasks described up to this point. But that is not yet a heat pump. To do this, instead of cooling liquid, it has to compress gaseous refrigerant so much that it gives off heat to a condenser. A throttle ensures that the necessary pressure is maintained from the pump via the condenser up to it.

However, the release of heat and the reduction of pressure causes at least partial liquefaction, which is only reversed again in the evaporator by the absorption of heat, e.g. from the outside air. This is also necessary, because the refrigerant must never flow into the pump or compressor when it is in a liquid state.

So the question is whether larger temperature differences between the systems can arise during the planned use of our electric car. Although temperature differences can occur, e.g. for pre-air conditioning with short- distance traffic, but the heat pump cannot really help.

It is more likely to be effective over longer distances, when significant differences have formed or even additional heating or cooling is necessary. And since we also want to use the car as an energy store at some point, selling it early is out of the question. The argument that it is more difficult to resell without a heat pump also falls away.



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