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Re: [EnergyPlus_Support] RE: Demand Controlled Ventilation
Ian:
CO2-based demand controlled ventilation is planned for EnergyPlus
version 1.1, to be released in mid-2003. For now, Derek's approach
should serve you well.
Mike Witte
On 18 Jul 2002, at 8:29, Derek McGarry wrote:
> Ian,
>
> Currently, the only practical way I know of to model DCV is by altering
> schedules for ventilation based on your own analysis (spreadsheets/owner
> input/judgement/ASHRAE62 guidance) of occupancy. LEED, for instance,
> accepts this kind of analysis...
>
> "To document savings for this scheme, follow the ECB Exceptional Calculation
> Method. See Section 11.5 of the ASHRAE 90.1 User's Manual. Under the ECM,
> schedule variations may be used as a basis of engineering calculations for
> discrete measures that are precluded by the reference standard or the LEEDTM
> EMP...An engineering narrative must provide a theoretical basis and describe
> the expected interactive modes the measure will have with other systems of
> the basic simulation, and it shall describe all of the
> assumptions in the analog system model used to predict the savings."(LEED
> Credit Inquiry Rulings)
>
> Where I think there is room for improvement is to actually use ASHRAE62's
> Quantitative evaluation procedures, which I think are based on metabolic
> rates, ventilation rates and occupancy schedules, and not simply using, say,
> 20cfm/person, but calculating carbon dioxide production.
>
> hope this helps.
> Derek
>
> -----Original Message-----
> From: Ian [mailto:Ian-Campbell@xxxxxxx]
> Sent: Wednesday, July 17, 2002 6:53 PM
> To: EnergyPlus_Support@xxxxxxxxxxxxxxx
> Subject: [EnergyPlus_Support] Demand Controlled Ventilation
>
>
> Hello...:)
> Are there plans for Demand Controlled Ventilation simulations in E+?
> If so, when may they be available?
> What other Demand Controlled Ventilation simulations have respect and
> professional standing?
> Thanks for any assistance.
>
> Ian Campbell, GPS Gas Protection Systems Inc.
>
>
>
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