EcoRenovator - View Single Post - Propane (R-290) for heat pumps?

AC_Hacker · 11-12-14, 01:54 PM

BBP,

Good analysis w/ good technical explanation.

I've done more than a few searches for studies of efficiency differences (COP) between R-22 & R-290, and R-290 comes out ahead in every study I've found.

Hacking a R-22 system straight across to R-290 works fine. The metering device may not be optimum, if you are using cap tubes. If you have an adjustable orifice device, like an adjustable TXV, you should be able to dial it right in.

Your study implies quite a few parameters that are different.

There are some free HX sizing programs in the Internet that will take into account the multi-variant factors, and you can dial right in the optimum components you need.

As I recall, THIS_ONE did a pretty good job.

-AC

11-12-14, 01:54 PM	#247
AC_Hacker Supreme EcoRenovator Join Date: Mar 2009 Location: Portland, OR Posts: 4,004 Thanks: 303 Thanked 723 Times in 534 Posts	BBP, Good analysis w/ good technical explanation. I've done more than a few searches for studies of efficiency differences (COP) between R-22 & R-290, and R-290 comes out ahead in every study I've found. Hacking a R-22 system straight across to R-290 works fine. The metering device may not be optimum, if you are using cap tubes. If you have an adjustable orifice device, like an adjustable TXV, you should be able to dial it right in. Your study implies quite a few parameters that are different. There are some free HX sizing programs in the Internet that will take into account the multi-variant factors, and you can dial right in the optimum components you need. As I recall, THIS_ONE did a pretty good job. -AC __________________ I'm not an HVAC technician. In fact, I'm barely even a hacker...