[Bldg-sim] Cooling Tower gpm/HP to EIR

Jones, Christopher Christopher.r.Jones at wsp.com
Thu Apr 12 05:54:06 PDT 2018


Hi Nick,
I have been out of commission the past two weeks. I came back to this task yesterday. My reading of FAN-KW/CELL is it is not exposed unless you input the size of the tower. If auto-sizing the tower, you have the EIR available for defining the fan power. I believe EIR = 0.013 is fairly equivalent to 38.2 gpm/HP when auto-sizing in eQuest. If my aging memory serves me well, I believe the value was EIR = 0.015 in 90.1-1989.



Christopher R. Jones, P.Eng.
Technical Specialist
Sustainability & Energy

[cid:image001.png at 01D3D23B.105A1980]
T +1 416-644-0252

2300 Yonge Street, Suite 2300
Toronto, ON M4P 1E4 Canada

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Please consider the environment before printing...


From: Nicholas Caton [mailto:Nicholas.Caton at schneider-electric.com]
Sent: Wednesday, March 21, 2018 2:37 PM
To: Javed Iqbal <javedvit at gmail.com>; Jones, Christopher <Christopher.r.Jones at wsp.com>
Cc: bldg-sim at lists.onebuilding.org
Subject: RE: [Bldg-sim] Cooling Tower gpm/HP to EIR

Here’s an eQUEST expression from my toolbox that doesn’t see so much use in my current line of work.  This saves you the implicit step of looking up the motor HP table (10.8) for efficiencies to determine the motor kW draw.  It’s an example I commonly point to when teaching expressions to point out you can go pretty far with nested if/then statements if that’s how your mind is operating in the moment, but the results aren’t always so pretty to look at.  It’s a good segue into introducing the wonderful world of switch statements.  Regardless, this is functional enough:



TOWERS - kW per cell



This will determine a tower's fan power input in accordance with ASHRAE 90.1 Appendix G.  Requires a #PA "Baseline CW Design GPM" which should be populated with the CW loop's GPM, following an auto-sizing run (re: PV-A or PS-D).



$Autosize your baseline tower's FAN-KW/CELL!

#PA("Baseline CW Design GPM")/38.2 $Actual HP requirement

*0.745699872 $HP to kW

/if(#PA("Baseline CW Design GPM")/38.2 < 1)

then .825

else if(#PA("Baseline CW Design GPM")/38.2 < 3)

then .840

else if(#PA("Baseline CW Design GPM")/38.2 < 7.5)

then .875

else if(#PA("Baseline CW Design GPM")/38.2 < 15)

then .895

else if(#PA("Baseline CW Design GPM")/38.2 < 25)

then .910

else if(#PA("Baseline CW Design GPM")/38.2 < 40)

then .924

else if(#PA("Baseline CW Design GPM")/38.2 < 60)

then .930

else if(#PA("Baseline CW Design GPM")/38.2 < 100)

then .936

else if(#PA("Baseline CW Design GPM")/38.2 < 150)

then .941

else .950

endif endif endif endif endif endif endif endif

endif $Incremental HP efficiency lookup, per T10.8

Hope this helps!

~Nick

[cid:image002.png at 01D3D23B.105A1980]
Nick Caton, P.E., BEMP
  Senior Energy Engineer
  Regional Energy Engineering Manager
  Energy and Sustainability Services
  Schneider Electric

D  913.564.6361
M  785.410.3317
F  913.564.6380
E  nicholas.caton at schneider-electric.com<mailto:nicholas.caton at schneider-electric.com>

15200 Santa Fe Trail Drive
Suite 204
Lenexa, KS 66219
United States

[cid:image003.png at 01D3D23B.105A1980]



From: Bldg-sim [mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of Javed Iqbal via Bldg-sim
Sent: Wednesday, March 21, 2018 9:21 AM
To: Jones, Christopher <Christopher.r.Jones at wsp.com<mailto:Christopher.r.Jones at wsp.com>>
Cc: bldg-sim at lists.onebuilding.org<mailto:bldg-sim at lists.onebuilding.org>
Subject: Re: [Bldg-sim] Cooling Tower gpm/HP to EIR

Hi,

There was an old post back in 2012 on this topic. Here i am pasting the excerpt from the post:

'An axial fan cooling tower is required per G3.1.3.11. Required cooling tower efficiency is 38.2 gpm/hp per ASHRAE 90.1, Table 6.8.1G. Let eQUEST autosize the cooling tower, and use the design flowrate shown on the PV-A report to determine the fan HP. Then convert to kW and enter the value in FAN-KW/CELL. The cell is normally grayed out, so right-click the cell and enter the kW value by changing the user default.'

Moreover, I do follow the same in E+ too.

Hope this helps!



On Wed, Mar 21, 2018 at 7:26 PM, Jones, Christopher via Bldg-sim <bldg-sim at lists.onebuilding.org<mailto:bldg-sim at lists.onebuilding.org>> wrote:
My mind is dead this morning. I can’t recall how to convert the 90.1 cooling tower fan power requirement to TWR-EIR for DOE2.2. For example, given 40.2 gpm/HP and convert Btu/Btu. Seems like you have to assume a delta-T for the condenser water flow in order to convert the gpm flow to Btu?


Christopher R. Jones, P.Eng.
Technical Specialist
Sustainability & Energy

[cid:image001.png at 01D3D23B.105A1980]
T +1 416-644-0252

2300 Yonge Street, Suite 2300
Toronto, ON M4P 1E4 Canada
wsp.com<http://wsp.com>


Please consider the environment before printing...



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