[Equest-users] evaporative coolers in equest

[Nick Caton]

I hope we're at a simple vocabulary disconnect here...

 

*         Upgrading the windows will reduce your solar cooling loads.

*         Reducing your solar cooling loads will reduce the amount of
heat to be removed from the building.

*         Reducing the amount of heat to remove will reduce the required
hours of operation of your HVAC system (in this case, evaporative
coolers) to maintain comfort.

*         Reducing the runtime of your evaporative coolers will result
in reduced energy consumption.  Fan energies primarily, in the case of
evaporative coolers.

*         In the event the existing system is not of sufficient capacity
to begin with, you may also/instead observe a reduction in unmet cooling
hours.

 

The reduction of solar loads with a glazing upgrade could be negligible
for a variety of possible reasons, but it's unlikely the net effect is
absolutely zero.  

 

~Nick

 

 

NICK CATON, P.E.

SENIOR ENGINEER

 

Smith & Boucher Engineers

25501 west valley parkway, suite 200

olathe, ks 66061

direct 913.344.0036

fax 913.345.0617

www.smithboucher.com 

 

From: deepika khowal [mailto:deepika.khowal at gmail.com] 
Sent: Tuesday, August 16, 2011 3:11 PM
To: Nick Caton
Cc: equest-users at lists.onebuilding.org
Subject: Re: [Equest-users] evaporative coolers in equest

 

 

This is an existing building with evaporative coolers.

the proposed design  to upgrade the windows and check the relative
benefits.

I dont see much benefits in energy because  evaporative coolers are
sized based on Cfm and not btus, the savings will be in cfms.

correct me if I am wrong.

is there any other way I can show the benefit in the proposed case if
not HVAC benefits?

Thanks

On Tue, Aug 16, 2011 at 1:00 PM, Nick Caton <ncaton at smithboucher.com>
wrote:

Hi Deepika,

 

I'm not certain any increase/decrease in cooling loads (such as solar
loads affected by changing glazing) should have any effect on the
reported "space cooling energy" when you're using evaporative coolers.
Direct evaporative (swamp) coolers of the simplest sort have only fan
and pump energies to consider -  no refrigerant!  I would advise looking
up the Detailed Simulation Reports Summary page 158/160 to review end
use categories and what they cover. 

 

I am unfamiliar with Bridgeport's climate, but as a general rule if I
observed a significant amount of glazing in a space served by a direct
evaporative cooler... I'd be extra cautious to ensure the HVAC designer
is carefully considering condensation and potential for other
humidity-driven issues along the way.  I'm most used to seeing them
applied to well-ventilated and/or open-air spaces such as garages and
gyms/hangars.

 

~Nick

 



 

NICK CATON, P.E.

SENIOR ENGINEER

 

Smith & Boucher Engineers

25501 west valley parkway, suite 200

olathe, ks 66061

direct 913.344.0036

fax 913.345.0617

www.smithboucher.com <http://www.smithboucher.com>  

 

From: equest-users-bounces at lists.onebuilding.org [mailto:
equest-users-bounces at lists.onebuilding.org] On Behalf Of deepika khowal
Sent: Tuesday, August 16, 2011 1:36 PM
To: equest-users at lists.onebuilding.org
Subject: [Equest-users] evaporative coolers in equest

 

Hello all

I am modeling a building in Bridgeport, CA which has evaporative
coolers.

I dont see any benefits if I replace existing clear glass with low-e in
cooling energy consumption.

Did anyone model evaporative coolers/swamp coolers before?

I want to know whether there is a way to show cooling benefit with such
HVAC system.

Thanks

Regards

Deepika

 

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