[Bldg-sim] ASHRAE 90.1 Appendix G3.1.2.2

[varun kulkarni]

Milda,
I think if you are performorming energy simulations for the baseline, it
doesnt matter what is this 25% and 15% upsizing is used for, as it used only
as much capacity it needs to satisify the loads and thermostat. And your
system size should be based on the design results and not simulation results
(that also proposed model).
But nevertheless I always interpret this as you said in your first point,
to cover uncertainity in building simulation.
I also think it helps baseline to reduce its unmet load hours.

Hope this helps.

  On Tue, Mar 29, 2011 at 3:27 AM, milda margarin <empire999 at hotmail.com>wrote:

>   hi , I already submitted this question but there were no responses so
> I'd like to try again:
>  could somebody share some insight to the ASHRAE 90.1 Appendix G3.1.2.2
> point regarding heating and cooling equipment sizing based on building
> energy simulations. It is stated that the equipment should be oversized by a
> factor of 1.25 for heating and 1.15 for cooling. Are these "safety factors"
> based on the uncertainty associated with building energy simulations or a
> requirement that makes sure that the system can respond quickly enough
> during startup? Why are there different factors applied for heating and
> cooling?
> thanks!
> Milda
>
>
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-- 

Thanks and Best Regards,



Sincerely,

Varun Kulkarni , M.S. , EIT

RMF Engineering

5520, Research Park Drive, Suite 300

Baltimore, MD - 21228



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