[Equest-users] U-Values

Bernardo Majano bmajano at rvanderson.com
Wed Jun 9 09:20:59 PDT 2010


I think it is expected if your internal heat loads (during cooling) are
usually higher than external heat gain which means the building is
"trapping heat" . This happened to one of our models where we have a
constant 120 kW electrical heat generation from an industrial
control/electrical room (Southern Ontario climate ). The increased
insulation was actually increasing the cooling load significantly and we
had to find an optimum insulation value. 

 

 

Bernardo Majano, B.Eng.  
Process Designer - Water/Wastewater
 
2001 Sheppard Avenue East Suite 400  Toronto ON M2J 4Z8 
Tel 416 497 8600   Ext 203  Fax 416 497 0342 
www.rvanderson.com 
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From: equest-users-bounces at lists.onebuilding.org
[mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Alex
Krickx
Sent: June 9, 2010 12:02 PM
To: Peter Hillermann; equest-users at lists.onebuilding.org
Subject: Re: [Equest-users] U-Values

 

I would say that's pretty much to be expected. As R value decreases,
more heat is lost though the envelope, so cooling loads decrease.

 

Typically when you increase R-value, the heating savings will outweigh
the additional cooling cost - however I'm sure there are specific
climates where this is not the case.

 

 

Alex Krickx

Building Energy Specialist

 

1250 Elko Dr, Sunnyvale, CA 94089

(t) 408.541.8124

 

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From: equest-users-bounces at lists.onebuilding.org
[mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Peter
Hillermann
Sent: Wednesday, June 09, 2010 8:48 AM
To: equest-users at lists.onebuilding.org
Subject: [Equest-users] U-Values

 

To All,

 

I seem to be having some issues with my baseline design and my first
parametric run. (I am working in detail mode with INP file) When I make
my baseline wall value R-13 and change it in my run to R-27 my heating
(MBTU) load goes down by 4% however my electric rate (kWh) goes up 1%. I
don't really understand because I thought both would have gone down. Am
I doing something wrong?

 

Thanks,

 

PETER HILLERMANN

 

peterh at westallarchitects.com

 

westall

architects

3404 pierce drive

chamblee, georgia 30341

 

o 770.458.4113

f  770.458.5352

c 678.898.2936

 

westallarchitects.com

  

 

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