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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
Best Regards
 



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Posted by: Julien Marrec <julien.marrec@xxxxxxxxx>


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