Hi,

I understand that many European car manufacturers plan to use CO2 (R744) as a refrigerant in many in-vehicle air conditioning systems. I'm guessing that they will also be capable of a reverse cycle heating function.

In light of that, I was examining this comparison of CO2 and water phase diagrams:

https://upload.wikimedia.org/wikipedia/commons/4/40/Comparison_carbon_dioxide_water_phase_diagrams.svg

I note my (regular) domestic aircon produces cool air at about 16C and warm air (outside) at around 50C. Can anyone predict what the temperature differential will be for a typical (i.e. useful but relatively cheap to produce) R744 heat pump and what the
temperatures will be on either side of the cycle? Lastly, does anyone perchance know of such a CO2 / R744 heat pump that is either 240vac, 12, 24 or 48vdc and runs at less than 10kw?

Thanks,

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