Forum discussion
NC-2009 EAp2: Minimum Energy Performance
Hi!
I am working on simulation of a warehouse where my proposed project has natural ventilation. This warehouse have occupation.
In my baseline, should i to simulate with air conditioning?
Thanks!
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Marcus Sheffer
LEED Fellow7group / Energy Opportunities
LEEDuser Expert
5909 thumbs up
November 1, 2013 - 11:48 am
Technically you are supposed to add a cooling system to a heating only space. If it is heated only you can model system 9 or 10 and forgo the cooling system. Is it heated?
Marina Andrade
Sustainability Consultancy ServicesCushman & Wakefield
17 thumbs up
November 1, 2013 - 12:11 pm
I don't understand.
No, the warehouse has no air conditioning system...only natural ventilation.
Marcus Sheffer
LEED Fellow7group / Energy Opportunities
LEEDuser Expert
5909 thumbs up
November 1, 2013 - 12:41 pm
Unconditioned spaces (no heating or cooling) are modeled identically in both cases.
Marina Andrade
Sustainability Consultancy ServicesCushman & Wakefield
17 thumbs up
November 1, 2013 - 1:01 pm
So, how can I gain in energy savings in occupied spaces where I have natural ventilation?
For example, in a meeting room I use natural ventilation (proposed). My baseline should not have an air conditioning system?
Jean Marais
b.i.g. Bechtold DesignBuilder Expert832 thumbs up
November 1, 2013 - 1:18 pm
1) Make sure not to confuse the fuctions of VENTILATION with CONDITIONING
2) If your zone is not conditioned, think of other end-users in the zone such as
- lighting
- heated water use
- process & plugloads
Marina Andrade
Sustainability Consultancy ServicesCushman & Wakefield
17 thumbs up
November 1, 2013 - 1:25 pm
What do you mean with " not to confuse the fuctions of VENTILATION with CONDITIONING"?
Thanks!
Jean Marais
b.i.g. Bechtold DesignBuilder Expert832 thumbs up
November 1, 2013 - 1:37 pm
- Ventilation is concerned with the fresh air amount for breathing.
- Conditioning is concerned with the temperature (and possibly humidity) conditioning of the air and surfaces of the zone.
For example, you may ventilate with windows and condition with hotwater radiators.
As soon as you condition, you must model a baseline conditioning system. Except for demand ventilation systems, the outdoor air ventilation rates of both baseline and design models must match, regardless if that outdoor air comes from windows or mechanical systems.
Marcus Sheffer
LEED Fellow7group / Energy Opportunities
LEEDuser Expert
5909 thumbs up
November 1, 2013 - 2:10 pm
Guidance on modeling natural ventilation for savings is found in Appendix C (I think) of the Advanced Energy Modeling Guide for LEED which can be found on the USGBC web site.