90.1-2010, Appendix G3.1.3.11 states, “The heat rejection device shall be an axial fan cooling tower with two-speed fans, and shall meet the performance requirements
of Table 6.8.1G.”
Table 6.8.1G gives the performance for open-circuit and closed-circuit towers but Appendix G doesn’t seem to specify whether one is to use an open or closed circuit
tower in the baseline.
Christopher Jones,
P.Eng.
Senior Engineer
WSP Canada Inc.
2300 Yonge Street, Suite 2300
Toronto, ON M4P 1E4
T +1 416-644-4226
F +1 416-487-9766
C +1 416-697-0056
From: EnergyPlus_Support@xxxxxxxxxxxxxxx [mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx]
Sent: Tuesday, March 15, 2016 10:58 AM
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: Re: [EnergyPlus_Support] Re: Tables 6.8.1 - ASHRAE 90.1-2007
Open cell for sure.
In EnergyPlus you can probably leave everything on autosize and as default values, that are CTI rated conditions.
- 95F entering water
- 85F leaving water
- either the default CTI OA wet bulb of 78F or (from approximate memory) 10F below the design wet bulb temperature, whichever is lower or something. It's further in appendix G
I don't recall seeing anything in 2007 about two speed towers?
Cheers
Julien
Envoyé de mon iPhone
Le 15 mars 2016 à 16:14, "fpasserini.tn@xxxxxxxxx [EnergyPlus_Support]" <EnergyPlus_Support@xxxxxxxxxxxxxxx> a écrit :
Sorry, Jean. I am considering ASHRAE 90.1-2010 because I'm considering a LEED v.4 project. I wrote in the wrong discussion and I confused...
In ASHRAE 2010 for "Propeller or axial fan open-circuit cooling towers" the performance required is 3.23 L / (s*kW) while for "Propeller or axial fan closed-circuit cooling towers" the performance required is 1.18 L / (s*kW). For the baseline model according to Appendix G shall I consider the first value?
---In EnergyPlus_Support@xxxxxxxxxxxxxxx, <jeannieboef@...> wrote :Does 2007 differentiate? It's been a while...probably open loop. The closed loop tower possibly performs a little less effectively, but has other real world advantages. I'm betting the performance gap is small, but don't have any experience to say for sure.
On 14 Mar 2016 3:37 pm, "fpasserini.tn@... [EnergyPlus_Support]" <EnergyPlus_Support@xxxxxxxxxxxxxxx> wrote:
Other questions relative to Table 6.8.1G of ASHRAE 90.1-2007:
- for the baseline model (System 8) shall I consider "open-circuit cooling towers" or "closed-circuit cooling towers"?
- how could the required performance be imposed in EnergyPlus? I'm using the object CoolingTower:TwoSpeed
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Posted by: "Jones, Christopher" <Christopher.r.Jones@xxxxxxxxxxxx>
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