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jeff5may · 02-01-13, 10:13 PM

Mikesolar,

Yours looks to be the type of HX i plan on using. I'm with AC Hacker on this one, it seems MASSIVE! How is the heat transfer on that behemoth? It's half the size of your compressor... I understand about the accumulator, but are your coils that mismatched? Or is it sized for max heat transfer? Or do you pump down every cycle?

If I could get another 8 deg c out of my unit, that would get me to -13 c (8 deg F). This would cover my heating needs in Kentucky for 363 days a year!

I have been reading up on the research surrounding these units, which claims that a 10-15% gain in capacity and efficiency is possible, as well as increased system stability. Also, they seem to perform the best at high temperature spreads. Combined with a TXV to keep the evaporator near saturation, it would seem to be a winning combination.

Here's another paper, which looks very similar to Mike's rig:

http://www.annex32.net/pdf/presentat...008_Stene2.pdf

02-01-13, 10:13 PM	#12
jeff5may Supreme EcoRenovator Join Date: Jan 2010 Location: elizabethtown, ky, USA Posts: 2,428 Thanks: 431 Thanked 619 Times in 517 Posts	Mikesolar, Yours looks to be the type of HX i plan on using. I'm with AC Hacker on this one, it seems MASSIVE! How is the heat transfer on that behemoth? It's half the size of your compressor... I understand about the accumulator, but are your coils that mismatched? Or is it sized for max heat transfer? Or do you pump down every cycle? If I could get another 8 deg c out of my unit, that would get me to -13 c (8 deg F). This would cover my heating needs in Kentucky for 363 days a year! I have been reading up on the research surrounding these units, which claims that a 10-15% gain in capacity and efficiency is possible, as well as increased system stability. Also, they seem to perform the best at high temperature spreads. Combined with a TXV to keep the evaporator near saturation, it would seem to be a winning combination. Here's another paper, which looks very similar to Mike's rig: http://www.annex32.net/pdf/presentat...008_Stene2.pdf Last edited by jeff5may; 02-01-13 at 11:02 PM..