[Equest-users] Huge envelope changes having small affect onenergy savings

[Umesh Atre]

Lee,

Your outputs show cooling savings around 13% and heating savings 3.5%.
As others have suggested earlier, you need to take a look at every
end-use separately. The heating consumption in this project is driving
your total energy consumption, as heating represents 55% of your total.
I would take a look at measures that might save your heating energy
consumption.

One thing I noticed is that you are assuming almost 90% occupancy 24/7
in this project. This is not typical of a residential building. Most of
your other schedules (for e.g. heating, lighting, plug loads) follow
similar patterns too. I would take a closer look at these, unless of
course these are intentionally set high.

And I did not see any improvements on the walls or roofs. Just on the
glazing. 

Best of luck.


________________________________

From: Lee Chorney [mailto:leec at alliedconsulting.net] 
Sent: Wednesday, August 22, 2012 4:50 PM
To: Umesh Atre
Cc: equest-users at lists.onebuilding.org
Subject: Re: [Equest-users] Huge envelope changes having small affect
onenergy savings


That is correct it is a 4 story residential building. I did a parametric
run were I changed the Air Chang per hour and U-values for the windows
and wall. I only saw a five percent energy savings when I thought with
such a drastic change (Wall R value from 4 to 30), the difference would
be much better. I have attached the file as a rar.

Thanks in advance,

Lee


On Wed, Aug 22, 2012 at 4:44 PM, Umesh Atre <umesh at innovativedesign.net>
wrote:


	
	Could you also share the equest pd2 files so that someone may
take a look at the output?
	From the input files, it looks like the only changes you have
are on the u-value and air-changes/hr (?). No change on the wall/roof
construction.
	Also, looks like you are modeling a 3-4 story residential
building.
	 

________________________________

	
	From: equest-users-bounces at lists.onebuilding.org
[mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Lee
Chorney
	
	Sent: Wednesday, August 22, 2012 3:43 PM
	To: equest-users at lists.onebuilding.org
	Subject: Re: [Equest-users] Huge envelope changes having small
affect onenergy savings
	
	
	Hi Guys,
	
	Here all the .inp files. 1.inp is the base and 2.inp is the
proposed.
	
	Thank you,
	
	Lee
	
	
	On Wed, Aug 22, 2012 at 12:48 PM, Lee Chorney
<leec at alliedconsulting.net> wrote:
	

		Hi All,
		
		
		I recently did a model where I had the same system in
both base and proposed but I changed the R-Value from 4 (base) to 20
(proposed). I also changed the window U-value from .80 (base) to .35
(proposed). After I did the run, I saw only a 5% savings between the
heating and cooling use in the model. When I looked at the loads I saw
the base had twice as much cooling and heating load than the proposed.
Does any know why the energy savings would only be 5% when you have a
huge difference between the cooling and heating loads?
		
		Thanks,
		
		Lee
		



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