[Equest-users] Modeling gas instantaneous water heaters in eQuest

[Nick Caton]

Hi David!

 

Hm...  I'll take a swing at this...

 

I'd suggest simply modeling a normal gas storage water heater.

1.       Zero out the ambient tank heat losses in detailed edit (set
tank UA to 0)

2.       Match burner efficiency (HIR) and capacity to the actual
equipment

3.       Call it a day ;)  

 

By default (coming out of the wizards), hot water loops don't have a
loop UA defined and so will not model losses.  If you're trying to
differentiate between instantaneous and storage systems with a
static/recirc loop, your storage model ought to define something for
loop losses to keep everything on a level playing field.

 

~Nick

 

 

 

 

NICK CATON, E.I.T.

PROJECT ENGINEER

Smith & Boucher Engineers

25501 west valley parkway

olathe ks 66061

direct 913 344.0036

fax 913 345.0617

www.smithboucher.com 

 

From: equest-users-bounces at lists.onebuilding.org
[mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of David
Cantrill
Sent: Tuesday, February 22, 2011 2:38 PM
To: equest-users at lists.onebuilding.org
Subject: [Equest-users] Modeling gas instantaneous water heaters in
eQuest

 

I am working on a project that is using instantaneous gas water heaters.
What is the best way to model these in eQuest?

 

Thanks,

 

 
David Cantrill
Branch Manager - Mississippi
  <http://www.cxgbs.com/> 
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with codes, design or general construction scheduling, cost estimating,
or construction management.  

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