Hi!
In Ashrae 90.1 2007 appendix G, in baseline simulation, what is the system type for humidification? (If the proposed building has humidification)
Many thanks
Ricardo
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Marcus Sheffer
LEED Fellow7group / Energy Opportunities
LEEDuser Expert
5906 thumbs up
March 5, 2012 - 6:11 pm
Typically humidification is modeled identically in the baseline and proposed models since it is not really addressed in Appendix G.
Ricardo Marques
3 thumbs up
March 6, 2012 - 4:24 am
Thanks Marcus Shiffer for your help,
I’m doing a thermal simulation of a data center based on ASHRAE 90.1 2007 Appendix G. The proposed building has a air cooled chiller and air handing units to cool the spaces. The proposed HVAC system has a direct evaporative cooling to control the humidity.
In baseline my HVAC system is the number 6 (Packaged VAV PFP Boxes). The baseline has air free-cooling.
In this case, what is the humidifier system for baseline?
Many Thanks
Ricardo
Marcus Sheffer
LEED Fellow7group / Energy Opportunities
LEEDuser Expert
5906 thumbs up
March 6, 2012 - 9:12 am
The same as the proposed for humidification. In our area humidification is typically added in the winter but only in situations where winter humidity levels are critical for the spaces served. So I am not sure based on your description above how the proposed is humidifying? What climate zone is the project?
Ricardo Marques
3 thumbs up
March 6, 2012 - 9:32 am
Marcus thanks for your help,
When the humidity below the set-point the evaporative cooling, cool the air and humidify it. The direct evaporative cooling cools the air through evaporation of water. This system below the temperature of air and humidify it. It’s true the humidification is typically in winter. The climate zone is 4A and 4B.
In this case the baseline system should be a evaporative humidifier cooling, as the proposed system, is it true?
Many Thanks
Ricardo
Marcus Sheffer
LEED Fellow7group / Energy Opportunities
LEEDuser Expert
5906 thumbs up
March 6, 2012 - 10:19 am
If that is the situation then yes.
Ricardo Marques
3 thumbs up
March 7, 2012 - 6:24 am
Marcus,
What is the efficiency of the direct evaporative cooling in baseline simulation?
Many Thanks
Marcus Sheffer
LEED Fellow7group / Energy Opportunities
LEEDuser Expert
5906 thumbs up
March 7, 2012 - 11:19 am
The same as installed.
If you wish to claim any savings you will need to establish a reasonable baseline and defend it to the reviewer following the exceptional calculation method.
Ricardo Marques
3 thumbs up
March 7, 2012 - 11:34 am
Many Tanks Marcus,
Keep on the good work!
Tanks for your help
Marcus Sheffer
LEED Fellow7group / Energy Opportunities
LEEDuser Expert
5906 thumbs up
March 7, 2012 - 12:12 pm
No thanks I don't need any tanks right now . . . just kidding. Your typos gave me a good chuckle.
You are welcome.