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jeff5may · 02-07-13, 03:42 PM

I found another article which describes the effect I am trying to achieve:

http://www.pattonnz.com/site/patton/...Exchangers.pdf

It suggests that with R290, a 40% in capacity can be theoretically achieved (ignoring changes in mass flow) and realistically 12% (considering mass flow) can be had with a SLHX that is 100% effective. Similar increases in COP are also suggested.

The charts the author provided show the effectiveness vs. gain is close to linear. I've been told the reduction in gain isn't as much from ideal as the author suggests, due to R290's inherent high latent heat. The liquid subcooling has more to do with heat flow than the vapor superheating, the mass flow doesn't decrease as much as expected.

02-07-13, 03:42 PM	#36
jeff5may Supreme EcoRenovator Join Date: Jan 2010 Location: elizabethtown, ky, USA Posts: 2,428 Thanks: 431 Thanked 619 Times in 517 Posts	I found another article which describes the effect I am trying to achieve: http://www.pattonnz.com/site/patton/...Exchangers.pdf It suggests that with R290, a 40% in capacity can be theoretically achieved (ignoring changes in mass flow) and realistically 12% (considering mass flow) can be had with a SLHX that is 100% effective. Similar increases in COP are also suggested. The charts the author provided show the effectiveness vs. gain is close to linear. I've been told the reduction in gain isn't as much from ideal as the author suggests, due to R290's inherent high latent heat. The liquid subcooling has more to do with heat flow than the vapor superheating, the mass flow doesn't decrease as much as expected. Last edited by jeff5may; 02-07-13 at 06:43 PM..