[Bldg-sim] ASHRAE 90.1 Baseline LPD and occupancy sensor credit

Ramana Koti ramana.koti at gmail.com
Thu Dec 1 11:32:10 PST 2011


Thank you all, that confirms my understanding.

RK.

On Thu, Dec 1, 2011 at 2:27 PM, Jim Dirkes
<jim at buildingperformanceteam.com>wrote:

>  Makes sense (and gets me thinking a bit differently, which is also
> good.)  Thanks!****
>
> ** **
>
> *The Building Performance Team
> **James V. Dirkes II, P.E., BEMP , LEED AP
> *1631 Acacia Drive NW
> Grand Rapids, MI 49504
> 616 450 8653****
>
> ** **
>
> *From:* Steven Savich [mailto:ssavich at systemswestengineers.com]
> *Sent:* Thursday, December 01, 2011 1:35 PM
> *To:* 'Jim Dirkes'; 'Bldg-Sim'
> *Cc:* 'Nick Caton'
>
> *Subject:* RE: [Bldg-sim] ASHRAE 90.1 Baseline LPD and occupancy sensor
> credit****
>
>   ** **
>
> Jim,****
>
> ** **
>
> My reasoning for adjusting schedules instead of LPD or actual connected kW
> is that it's more transparent for the reviewer, because:****
>
> The baseline LPDs == 90.1 required values****
>
> Proposed model LPDs or directly input kWs == what is on the drawings****
>
> ** **
>
> You can then have identical "occupancy sensor" schedules in both the
> models which is applied where occupancy sensors are *required *in the
> baseline (classrooms, conference, etc), and where occupancy sensors are *
> installed* in the proposed building model.****
>
> ** **
>
> Steven****
>
> ** **
>
> *From:* Jim Dirkes [mailto:jim at buildingperformanceteam.com]
> *Sent:* Thursday, December 01, 2011 10:15 AM
> *To:* ssavich at systemswestengineers.com; 'Bldg-Sim'
> *Subject:* RE: [Bldg-sim] ASHRAE 90.1 Baseline LPD and occupancy sensor
> credit****
>
> ** **
>
> Steven,****
>
> Out of curiosity, why do you think it matters that the *schedule* be
> adjusted instead of the *LPD*? It seems that the end result will be the
> same.****
>
> ** **
>
> *The Building Performance Team
> **James V. Dirkes II, P.E., BEMP , LEED AP
> *1631 Acacia Drive NW
> Grand Rapids, MI 49504
> 616 450 8653****
>
> ** **
>
> *From:* bldg-sim-bounces at lists.onebuilding.org
> [mailto:bldg-sim-bounces at lists.onebuilding.org] *On Behalf Of *Steven
> Savich
> *Sent:* Thursday, December 01, 2011 12:35 PM
> *To:* 'Ramana Koti'; 'Bldg-Sim'
> *Subject:* Re: [Bldg-sim] ASHRAE 90.1 Baseline LPD and occupancy sensor
> credit****
>
> ** **
>
> Ramana,****
>
> ** **
>
> 90.1-2007 Table G3.1 section 6 under Baseline Building Performance states:
> " . . . No automatic lighting controls (e.g. programmable controls or
> automatic controls for daylight utilitzation) shall be modeled in the *baseline
> building design*, as the lighting schedules used are understood to
> reflect the mandatory control requirements in this standard."****
>
> ** **
>
> You should not be adjusting the power density number to simulate lighting
> controls, but adjusting the schedules to reflect occupancy sensor
> operation.  For example, say there are a number of offices and conference
> rooms in the proposed building that will have occupancy sensor controls.
> This should be simulated by inputting the LPD or actual connected load, and
> creating a schedule with a 10% - 15% reduction for each hour of operation
> per Table G3.2.  In the LEED baseline model, the schedule for the offices
> would be not have the occupancy sensor reduction, but the conference room
> and other spaces required by 90.1 to have occupancy sensor control would
> use the reduced schedule.  Clear as mud?****
>
> ** **
>
> Steven****
>
> ** **
>
> *From:* bldg-sim-bounces at lists.onebuilding.org
> [mailto:bldg-sim-bounces at lists.onebuilding.org] *On Behalf Of *Ramana Koti
> *Sent:* Thursday, December 01, 2011 8:21 AM
> *To:* Bldg-Sim
> *Subject:* [Bldg-sim] ASHRAE 90.1 Baseline LPD and occupancy sensor credit
> ****
>
> ** **
>
> All,****
>
>  ****
>
> This question pertains to a LEED energy model per the ASHRAE 90.1 Appendix
> G. Occupancy sensors are required in spaces such as conference rooms and
> employee lunch/break rooms per Section 9.4.1.2 and no lighting power
> density credit can be taken for their use in the proposed design model.***
> *
>
>  ****
>
> My question is, do the baseline maximum LPDs prescribed by ASHRAE, say 1.3
> W/sf for conference rooms, already account for the power 10 or 15%
> adjustment for occupancy sensor use or does the credit have to be manually
> applied on top of the 1.3 W/sf in the Baseline model?****
>
>  ****
>
> Thank you,****
>
> Ramana Koti.****
>
>  ****
>
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