[Equest-users] Heat recovery run around loop

[David Bastow]

Nick,
 
In the detailed modeling mode click on the system and then go to the
spreadsheet mode then select energy recovery ventilator drop down menu
and utilize all the inputs in that area, regarding energy recovery
ventilator, to input all your design information.  I have used this
numerous times for the application that you are talking about.  I would
caution you not to just use all the default efficiency numbers that will
show up automatically, but input as close as you can actual design
numbers on efficiency and especially on KW use, that you have involved
in this design process.  You can input the KW use for your pump in the
place of the fan KW or fan and pump KW use together, if that is
applicable.  I have noticed often times that inexperienced modelers
often will just use the KW use default numbers, because it is easy,
rather than really taking the necessary design time to figure out what
the true KW use numbers are actually.  These incorrect input numbers
will many times show the electrical use related to the heat recovery
system to be way higher than they actually are.  This will often make a
very good energy conservation measure, incorrectly, into a real dog.
You should also take real care on how the system is controlled and
should probably run a number of different models, with different control
sequences, to see which control design works best for your particular
heat recovery design.
 
Thanks, 
David A. Bastow 
McClure Engineering, Inc.  
507 Main Avenue West
Post Office Box 1404
Twin Falls, Idaho   83303-1404
<mailto:dbastow at mcclure-engineering.com> 
Web Site:  www.mcclure-engineering.com
<http://www.mcclure-engineering.com/> 

________________________________

From: equest-users-bounces at lists.onebuilding.org
[mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of
Nicholas Couture, LEED AP
Sent: Tuesday, March 16, 2010 7:26 AM
To: equest-users at lists.onebuilding.org
Subject: [Equest-users] Heat recovery run around loop


Hi All:
 
I would like to ask how to model a heat recovery run around loop.
Exhaust air from four air handlers passes over a air to water coil, and
the heat recovered to the water loop is sent to the preheat coils of the
four air handlers.  Keep in mind I have limited experience in the
detailed interface.
 
My first guess is that I would have to create an air to water coil.
Now, how do I connect the exhaust air stream from the four air
handlers... do I set an exhaust amount to each zone??
Then would I create a HW loop connecting the energy recovery coil to the
four pre-heat coils??
 
thanks,
 
Nick Couture, LEED AP
Mechanical Engineer  

 

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Ronkonkoma, NY 11779
Tel:  631.981.3990 ext. 230
Fax: 631.981.3971
ncouture at emtec-engineers.com


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