Efficiency of R600a

[ctscasemod]

Every fridge maker these days is using R600a as a highly efficient refrigerant, and I have seen some laboratory studies about it being about 50% more efficient than R22.

I was wondering if anyone knows some kind of Thermal expansion valve that works with this refrigerant, as I would like to make some tests with old air conditioner units, especially for high temperature applications where r22 couldn't be used because of high head pressures.

Thanks

[Brian_UK]

Beware the explosion factor.