[Equest-users] IPLV in Heat Pumps

[Paul Diglio]

Amandeep:
 
I agree with John.  Actually, I believe IPLV is a somewhat new rating that applies to larger systems.  EER or COP are much more accurate ratings.
 
I am confused about the SEER and IPLV ratings.  What temperature bin do they use to calculate these numbers?  It would seem to me that an AC system in the south would operate at a higher load throughout the cooling season than one in the northeast.  Of course, it would depend on how the system was sized.  An oversized system will operate at a much lower load ratio than a tightly sized system.
 
Does anyone know the formula?
 
Paul Diglio, CEM

--- On Sun, 12/20/09, John Aulbach <jra_sac at yahoo.com> wrote:


From: John Aulbach <jra_sac at yahoo.com>
Subject: Re: [Equest-users] IPLV in Heat Pumps
To: "Amandeep Singh" <amandeep.singh at energycenter.org>, equest-users at lists.onebuilding.org
Date: Sunday, December 20, 2009, 9:02 PM






Amandeeph:
 
As far as I am concerned, IPLV is a mythical number, like SEER. It is based on assumed levels of usage for a pumed annual usage. If your truly need part load curves, ask the manufacturer for the 75%, 50% and 25% points. You cannot evolve these four numbers out of a single mnumber (IPLV).





From: Amandeep Singh <amandeep.singh at energycenter.org>
To: equest-users at lists.onebuilding.org
Sent: Thu, December 17, 2009 1:03:45 PM
Subject: [Equest-users] IPLV in Heat Pumps







Hello everyone,
 
I was working on a school model located in Lakeside,  San Diego county. The school has Bard wall mount heat pumps (capacity – 2 to 4 tons), really old one. I got manufacture data of the old and new units for replacement. The new units data has EER, IPLV and COP ratings. I  would prefer to use IPLV instead of EER rating in case of cooling  to calculate savings.  The eQuest does have options for EER and SEER but not for IPLV in the schematic design wizard.  What should I do here? 
 
Does it make sense to use IPLV instead of EER to calculate savings for the Lakeside? 
 
Thanks,
Aman 
 
 






Amandeep Singh
Energy Engineer
8690 Balboa Ave, Suite 100
San Diego, CA 92123-1502
858.634.4729 phone
858.244.1178 fax
www.energycenter.org web
 
Submit your SANDEE Award nomination today.
Visit www.energycenter.org.
 

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