Compressor as Expansor

[rcarlitos99]

Hi everybody,

It’s the first time in this forum. I’m project engineer from Spain and we are working in a new project, an Organic Rankine Cycle for power recovering.

We have an organic fluid (could be R-245fa or R-134) in steam phase (82ºC and 8,3 bar abs) and we want to expand it until 1 bar in winter or 2 bar in summer, both abs.

My questions:

Which are the best devices to use? The screw compressor? Of course, thinking in the efficiency and also in the final price. The turbines are very expensive.

Which is the isentropic efficiency of the device?

And the most important thing, could someone tell me a supplier of these kind of devices (in Europe or in America)?

The idea is to develop devices in the range of 30 to 190 mechanical Kw in the shaft and couple that shaft to an electric generator.

Regards!!

[The Viking]

Why the double posting??

It just wasting space.

See my reply in your other tread.