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Re: [EnergyPlus_Support] Zone Level Airflows

Thanks Jean,

I did find some support from LEEDuser for oversizing at the zone level (see below). Which would confirm as Jim pointed out that the reviewer is mistaken in raising the 25% increased VAV flow as an issue. I'm going with this, wish me luck!

Marcus Jones,  M.Sc., LEED®AP BD+C
Freelance energy consultant
Vienna, Austria

Comment by Micheal Tillou, re: How to oversize;

1. Set all internal load and envelope parameters to the baseline conditions.
2. Set design day criteria to the required ASHRAE conditions specified in Appendix G. Remember that programs like eQUEST require the creation of special heating and cooling design days otherwise the peak heating and cooling is based on the weather file.
3. Simulate the model and find the peak heating and cooling loads for each system.
4. Increase the peak heating loads by 25% and the peak cooling loads by 15%.
5. Calulate the supply air flow rate for each system using a 20F delta-T.
6. Enter in the calculated heating and cooling capacities and the supply air flow rates for each baseline system.
7. Simulate the final baseline HVAC energy model.

Comment by Marcus Sheffer re; Sizing equipment vs. zone;

Correct it can't be done at both the system and zone level. In general it is done at the zone or the plant level, usually the zone level. Again it can't be at both.


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