[Equest-users] CT Recirc air and quantifying energy penalty in equest for increased entering WB Temp

Robby Oylear robbyoylear at gmail.com
Wed Jul 18 16:20:57 PDT 2012


This might be a situation where you want to use actual energy readings.  If
they have a consistent load (or maybe you can false load the system
somehow) you could take power readings or run some trends at night when the
"effective" wet bulb in that built-up well would be closer to what you'd
see if the tower was open to ambient air.  Compare the two power usage
measurements/trends and there's your savings.

If the tower fans have VFD's you should already have power metering
capability.

Robby Oylear, PE, LEED AP

*Mechanical Engineer*

*Senior Energy Analyst*

* *

*D* 206-788-4571

*www.rushingco.com* <http://www.rushingco.com/>

On Wed, Jul 18, 2012 at 3:55 PM, Nikola Kravik <NKravik at willdan.com> wrote:

> Hi,****
>
> I have a project designed with a WSHP/Fluid cooler where the 2 cell
> FCooler was put in a “cage of wall” (so neighbors don’t hear the sound
> db’s).****
>
> ** **
>
> Well the sound may be lower, but they have bigger issues with the recirc
> air and elevated wet bulb around the tower, contractor did measurements and
> instead of 72F EAWB is about 77F.****
>
> 95/85 design though with the wet bulb at 77-78F, tower is doing 101/91F+.*
> ***
>
> ** **
>
> I tried to quantify the penalty for the decreased capacity (or the other
> way around the get savings if we knock the wall and bring the db back to
> 72F) by playing with the approach temp (from the design 13F to 19F) under
> the FCooler but that didn’t make a difference.****
>
> ** **
>
> Then I tried the CW loop, elevating the CHW Temp to simulate increased
> FCooler Leaving supply temp from designed 85F to 90+F and that yield about
> 100Kwh savings but now sure if this is the right way to do it in equest
> –has anybody attempted something similar in equest and got justifiable
> results? Would you recommend doing it some other way in equest? ****
>
> ** **
>
> Thank you,****
>
> Nikola****
>
> ** **
>
> ** **
>
> ****
>
> ****
>
> ****
>
> Nikola Kravik, LEED AP [image: Description:
> cid:image001.gif at 01CB9AE0.30118F00]
> Project Engineer****
>
>
> *Willdan Energy Solutions*
>
> 6130 Stoneridge Mall Road, Suite 380
> Pleasanton, CA 94588****
>
> T. 925.416.4200 ext. 1228
> D. 925.416.4228 ****
>
> C. 925.719.5883
> F. 925.737.0174****
>
> nkravik at willdan.com
> www.willdan.com/energy****
>
> ** **
>
> [image: WD_tagend_300rgb]****
>
> ** **
>
> _______________________________________________
> Equest-users mailing list
> http://lists.onebuilding.org/listinfo.cgi/equest-users-onebuilding.org
> To unsubscribe from this mailing list send  a blank message to
> EQUEST-USERS-UNSUBSCRIBE at ONEBUILDING.ORG
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.onebuilding.org/pipermail/equest-users-onebuilding.org/attachments/20120718/bf133e0a/attachment-0002.htm>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: not available
Type: image/jpeg
Size: 3030 bytes
Desc: not available
URL: <http://lists.onebuilding.org/pipermail/equest-users-onebuilding.org/attachments/20120718/bf133e0a/attachment-0006.jpeg>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: not available
Type: image/jpeg
Size: 76198 bytes
Desc: not available
URL: <http://lists.onebuilding.org/pipermail/equest-users-onebuilding.org/attachments/20120718/bf133e0a/attachment-0007.jpeg>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: not available
Type: image/gif
Size: 1348 bytes
Desc: not available
URL: <http://lists.onebuilding.org/pipermail/equest-users-onebuilding.org/attachments/20120718/bf133e0a/attachment-0002.gif>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: not available
Type: image/jpeg
Size: 49465 bytes
Desc: not available
URL: <http://lists.onebuilding.org/pipermail/equest-users-onebuilding.org/attachments/20120718/bf133e0a/attachment-0008.jpeg>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: not available
Type: image/png
Size: 45085 bytes
Desc: not available
URL: <http://lists.onebuilding.org/pipermail/equest-users-onebuilding.org/attachments/20120718/bf133e0a/attachment-0002.png>


More information about the Equest-users mailing list