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
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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!
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
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Nick Caton, P.E., BEMP
Senior Energy Engineer
Regional Energy Engineering Manager
Energy and Sustainability Services
Schneider Electric
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M 785.410.3317
F 913.564.6380
E nicholas.caton at schneider-electric.com
15200 Santa Fe Trail Drive
Suite 204
Lenexa, KS 66219
United States
[cid:image003.png at 01D3C119.AF4C9050]
Thanks Nick,
Silly me, looking for TWR-EIR ? still back in DOE2.1e.
Christopher R. Jones, P.Eng.
Technical Specialist
Sustainability & Energy
[cid:image001.png at 01D3C127.A697FC20]
T +1 416-644-0252
2300 Yonge Street, Suite 2300
Toronto, ON M4P 1E4 Canada
wsp.com
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