[Bldg-sim] R-410a & EA credit 4 (UNCLASSIFIED)

[James Hansen]

I've always found that you have a tougher time achieving this credit with smaller units, since they have more refrigerant per ton. But it is not out of the question...you really have to run the calcs to be sure.

If you have a chiller system, or large packaged RTUs, much easier time, although you still need to make sure the manufacturer's rep doesn't oversize the refrigerant coil to achieve the highest efficiency (and bump you over the allowed 100 refrigerant impact per ton).

GHT Limited
James Hansen, PE, LEED AP
Senior Associate
1010 N. Glebe Rd, Suite 200
Arlington, VA  22201-4749
703-338-5754 (Cell)
703-243-1200 (Office)
703-276-1376 (Fax)
www.ghtltd.com



-----Original Message-----
From: bldg-sim-bounces at lists.onebuilding.org [mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of Eurek, John S NWO
Sent: Monday, January 31, 2011 12:31 PM
To: bldg-sim at lists.onebuilding.org
Subject: [Bldg-sim] R-410a & EA credit 4 (UNCLASSIFIED)

Classification: UNCLASSIFIED
Caveats: NONE

Quick question.  (Looking for a short and sweet response) Is EA credit 4
likely to be achieved using equipment using R-410a.

I have the equations, but I haven't run through them yet.

Shooting from the hip, is it impossible, unlikely, 50/50, very likely, or a
sure thing to earn EA credit 4 with R-410a.

[I have two projects, one using water to water heat pumps with a geothermal
well field, and the other is a 10 ton dx system.]

John Eurek

Classification: UNCLASSIFIED
Caveats: NONE


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