Hello Everyone!

I just joined this forum as it seams there is a lot of knowleadgable people over here...

I am learning how heat pumps work and I had a few questions where I could not find answers anywhere...

I understand that an inverter varies the speed of the compressor to match the needed capacity.

Now i also understand that the speed of the compressor will affect the pressure and the flow.

So my question is: if the compressor is spinning at 50% of its speed. I assume the pressure is going to be also 50% of the maximum. The flow will probably be 50% as well.

Now I don't understand what happens with the expansion valve....It is my understanding that the pressure drop increases with the flow increasing...Now reducing the flow and pressure on one side of the valve being reduced by 50%, what will hapen on the other side of the valve....

For example at 100% compressor speed with 400PSI on the high side and 200 Psi on the low side. The pressure Ratio is 2.0.

If the high side becomes now 200PSI, what will be the low side pressure?? Will the pressure ratio remain the same and then we get 100PSI????

If the Pressure ratio changes, how do we control it???I also understand that this will greatly affect the COP

I don't know if my question is clear or not....if you don't understand I can probably reformulate a little bit

Thanks everyone for your time!