[Bldg-sim] energy recovery and zone setpoints

[Corinne Benedek]

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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