[Equest-users] IPLV in Heat Pumps

[Jonathan Curtin]

All,
 
The ASHRAE Journal December 2009 Issue has a fitting article "A Closer
Look at Chiller Ratings" highlighting the problems of over-reliance on
IPLV/NPLV for use with chillers, and specifically what type of impact
climate has on these ratings. Lesson: be wary of these broadly applied
simplified ratings.
 
eQUEST won't allow you to input IPLV to describe a system, but you can
calculate it for the part-load and off-design performance curves that
eQUEST will use as defaults, and determine if the curves are suitable to
use in your case. Just don't be surprised though if the actual
performance based on your specific building and location ends up nowhere
near the IPLV performance.
 
Regards,
 

  Jonathan M. Curtin, EIT, LEED(r) AP
  Mechanical Engineer

  


________________________________

From: equest-users-bounces at lists.onebuilding.org
[mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Paul
Diglio
Sent: Monday, December 21, 2009 04:15 AM
To: Amandeep Singh; equest-users at lists.onebuilding.org; John Aulbach
Subject: Re: [Equest-users] IPLV in Heat Pumps


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 <http://www.energycenter.org/>  web 

	  

	Submit your SANDEE Award nomination today. 

	Visit www.energycenter.org
<http://www.energycenter.org/signature> . 

	  


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