[Bldg-sim] energy recovery and zone setpoints

Corinne Benedek corinne.benedek at arup.com
Thu Dec 27 13:13:17 PST 2007


Thanks for the suggestion! - but interestingly enough, I do already have
Mixed Air Reset as my setting. 

Any idea what mechanism it is that chooses which setpoint to follow?  I
can't seem to find any patterns that suggest what is happening.

 

Thanks!

 

________________________________

From: mike at andelmanlelek.com [mailto:mike at andelmanlelek.com] 
Sent: Thursday, December 27, 2007 4:10 PM
To: Corinne Benedek
Subject: RE: [Bldg-sim] energy recovery and zone setpoints

 

If you have Make-up Air Temp Ctrl at the default (floating), you will be
delivering warmer air, driving the space to the cooling setpoint and
engaging mechanical cooling.  Recommend changing this to "mixed air
reset", that way you will have normal economizer operation.

 

Mike

 

________________________________

From: bldg-sim-bounces at lists.onebuilding.org
[mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of Corinne
Benedek
Sent: Thursday, December 27, 2007 3:56 PM
To: Steve Mignogna
Cc: bldg-sim at lists.onebuilding.org
Subject: Re: [Bldg-sim] energy recovery and zone setpoints

 

Both vent fan usage and cooling increase significantly.  From the hourly
reports, it's not looking like it's a balancing issue in terms of fans
vs cooling.

Heating does decrease with the ERV.  The fan energy increase seems to
make sense in principle, but I'm still not sure why there are hours when
the cooling setpoint (75 deg F) is being used in the model with the ERV
where the heating setpoint (70) is being used in the non-erv model.

 

-Corinne

 

________________________________

From: Steve Mignogna [mailto:smignogna at gmail.com] 
Sent: Thursday, December 27, 2007 3:44 PM
To: Corinne Benedek
Cc: <bldg-sim at lists.onebuilding.org>
Subject: Re: [Bldg-sim] energy recovery and zone setpoints

 

In terms of the sub uses what decreases?  Sometimes your fan energy will
increase so much that it over shadows the decrease in cooling and
heating. 

 

Sent from my mobile wireless device.


On Dec 27, 2007, at 2:34 PM, "Corinne Benedek"
<corinne.benedek at arup.com> wrote:

	Hello All,

	 

	I have a question about the way eQuest / DOE 2.2 decided whether
it should be using the heating or cooling zone setpoint for a particular
hour.  

	 

	I am modeling a PSZ system with energy recovery (enthalpy wheel
with mixed air reset and "modulate hx" capacity control) and am finding
that when I remove the energy recovery from the model, energy use
decreases.  When I look at the hourly reports, there are a number of
hours where the "no erv" model is using a heating setpoint and the "erv"
model is using a cooling setpoint for the zone particularly in the
winter.  Any ideas about how this setpoint gets chosen and why the ERV
would be affecting it?  

	 

	Any ideas would be very much appreciated.

	 

	Thanks!

	 

	Corinne Benedek

	 

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	LEED AP, EIT
	
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