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sammy37 04-25-2013 05:47 PM

condenser coil sizing
 
For anyone familliar with Goodman residential package units, the front of the unit had a full size coil under the louver that wraped around to a side coil under another louver, the side coil was about 15 inches wide.
I was looking at one of Goodmans newest units today and it appears that the coil doesnt wrap around the side anymore and it isnt the full height of the unit, in fact, they have the top portion behind the louver blanked off with sheet metal.
I always that that the bigger the coil, the better it would be for efficiency, Goodman did just the opposite.
I would love to hear some replys on this. This applys to all sizes of their gas packaged units.

hvactech126 04-25-2013 06:07 PM

Sounds like a micro channel coil. They are much smaller and correct charge matters a LOT more.

yuri 04-25-2013 06:14 PM

Yeah, I wuz reading in some trade magazines that they have developed a smaller tubing (5/16" instead of 3/8") and with the special thickness of it and layout it conducts heat faster. Most manufacturers are developing higher conductivity coils with different fin designs etc so size does not matter it's how you use it.:yes: The very high end Lennox units have a ECM cond fan motor with thermistors attached to the coil and will vary the speed of it accordingly. Fujitsu minisplits have that for several years already.

sammy37 04-26-2013 09:21 AM

When I looked down inside the top of the unit, the copper appeared to be 3/8 but who knows, couldnt find anything about it on their website either.

When I did the Goodman tour, they showed me the new 5mm coils they were offering but at the time, it was condensing units only that they were offering it in.

yuri 04-26-2013 11:41 AM

like I said the manufacturers are using different types of coils and layouts to get a certain heat transfer rate. yrs ago comfort aire had a flat aluminum accordian looking coil and Trane has their spine coil. Carrier used it too. all depends on what the engineers can make work to get the SEER rating. number of fan blades and pitch etc adds to the equation. hopefully ecm motor prices and technology will drop drastically within 5 yrs as the market share goes up and that is the ultimate.

sammy37 04-26-2013 12:26 PM

Quote:

Originally Posted by yuri (Post 1167679)
like I said the manufacturers are using different types of coils and layouts to get a certain heat transfer rate. yrs ago comfort aire had a flat aluminum accordian looking coil and Trane has their spine coil. Carrier used it too. all depends on what the engineers can make work to get the SEER rating. number of fan blades and pitch etc adds to the equation. hopefully ecm motor prices and technology will drop drastically within 5 yrs as the market share goes up and that is the ultimate.

I put an evergreen retrofit motor in mine, very happy with it.

Jim-Martin 05-02-2013 04:52 PM

A quick answer
 
You are right.


There is no airflow in that section of the condensor, but, the restriction is compensated for in the design of the coil.


Have a nice day,

Jim Martin


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