Dear all,
I have a query about assigning the area light values and miscellaneous
equipment values in eQuest.
While assigning the area lights, exterior loads and miscellaneous equipment
loads; I input the necessary power densities in the wizard mode. However I
have realized that, the exterior lighting load (w/sf) input in the Wizard
mode is multiplied by the building area (all floors) and becomes a direct kW
load on the electric meter. This directly resulted in very high numbers for
the exterior usage in the simulation results. This is erroneous in my case
and I have figured out a way to correct it by calculating the actual
exterior load figure and assigning it to the electric meter and updating it
with a necessary schedule.
I was wondering if the software considers a similar analogy for calculating
the area lights and the miscellaneous equipment figures in the simulation
results as it does for the exterior usage. If that is so, i am sure my
results are way too wrong or over board. what would be correct way/s to
input the area light and miscellaneous equipment figures.
Thanks for your time in anticipation.
--
Regards,
Ar. Kirti Pramod Pabrekar.
Dear all,
I have a query about assigning the area light values and miscellaneous
equipment values in eQuest.
While assigning the area lights, exterior loads and miscellaneous equipment
loads; I input the necessary power densities in the wizard mode. However I
have realized that, the exterior lighting load (w/sf) input in the Wizard
mode is multiplied by the building area (all floors) and becomes a direct kW
load on the electric meter. This directly resulted in very high numbers for
the exterior usage in the simulation results. This is erroneous in my case
and I have figured out a way to correct it by calculating the actual
exterior load figure and assigning it to the electric meter and updating it
with a necessary schedule.
I was wondering if the software considers a similar analogy for calculating
the area lights and the miscellaneous equipment figures in the simulation
results as it does for the exterior usage. If that is so, i am sure my
results are way too wrong or over board. what would be correct way/s to
input the area light and miscellaneous equipment figures. Please find
attached the .INP file for your reference.
Thanks for your time in anticipation.
--
Regards,
Ar. Kirti Pramod Pabrekar.
Kirti,
We can give actual exterior load by assigning it to the electric meter as screen shot 1, before that you have to create the exterior lighting schedule as shown in screen shot 2 day, week & annul schedule, then you can assign the calculated value in electric meter in detail mode. Regarding the miscellaneous equipment leave eQUEST default as shown in screen shot 3 , otherwise if you enter the value by yourself it should be same in baseline & proposed. Regarding LPD for Baseline ASHRAE 90.1 value & for Proposed Actual electrical design. I hope this helps you...
[cid:image005.jpg at 01CC1979.5055A8B0][cid:image006.jpg at 01CC1979.5055A8B0] [cid:image009.jpg at 01CC1979.5055A8B0]
Kind Regards
Soham babu
Soham and Kirti,
1. Exterior lighting: W/SF as entered in the wizards is
multiplied by the corresponding shell's area in which you're assigning
it. Quirky, but if you keep that in mind you can avoid the extra step
of correcting in detailed. It's an easy mistake to enter installed
Watts or kW in the wizard (that seems intuitive to me also).
2. Miscellaneous loads and LPD's in the wizards are also handled
on a W/SF basis, but for each space. You can override the defaults if
you wish to:
a. LPD is entered for each occupancy type, and those occupancy
types are then assigned to each zone, if you fully utilize the DD
wizards. You may be as detailed (or not) in assigning your occupancy
types as you feel comfortable/necessary.
b. For miscellaneous equipment, I suggest referencing the 90.1
User's manual for plug load W/SF in the context of a LEED/90.1 model.
You can similarly enter a uniform W/SF value for each occupancy type and
that will translate straight into detailed.
c. Miscellaneous loads beyond plug loads (ex: elevators, process
equipment...) are something I usually handled in detailed mode, where I
can directly edit/create/import the associated scheduling and assign
names I can easily track/reference/document.
3. An extra reminder: You can streamline the process of defining
exterior lighting schedules by saving re-useable ones in an .inp file
and importing them from previous projects ;). More discussion in the
archives if you're curious!
~Nick
NICK CATON, E.I.T.
i used to not separate them out either but 2 leed reviews ago i received
a comment about it. being active about it i just did my next submittal
with it broken out & then found out (via a cir from 2007) that the
reason they're asking is the reviewers want to make sure credit is only
taken for the tradable exterior lighting power. exterior non-tradable
lighting power is energy neutral. i.e. you can't use the designed,
lower than leed allowed non-tradable in the proposed model and the
higher 90.1 allowable in the baseline. makes no sense to me what so
ever. as far as i'm aware non-tradable means just that - you can't
trade it for higher lighting power elsewhere, not that when simulated
you can't claim credit for using less than what is allowable.
but the cir says otherwise, along with 10 or so other things. april 25,
2007. also noted in the advanced energy modeling guide for leed common
errors section on page 27, last row, last bullet item, "Nontradable
surfaces are not modeled with lesser of nontradable surface and
installed lighting power for each nontradable surface, as required."
without wanting to change the topic to water savings note question 9
(they put in 11 questions in one cir), if you didn't know you can't
claim energy savings due to using low flow fixtures. so if you're using
less hot water you can't reduce the amount of water circulated to claim
credit on the electrical (and/or gas) side of things.
cir from april 25, 2007 states 2 important things:
Inquiry Number: 5261
MPR/Prerequisite/Credit: EAc1: Optimize Energy Performance
Posting date: 4/25/2007
[REVISED 10/30/07 to allow energy savings for exterior lighting.] ...
question:
7. Exterior Lighting Will USGBC for LEED 2.2 allow credit for exterior
lighting that is more efficient than the new mandatory provision for
exterior lighting in 90.1-2004 section 9.4. Appendix G does not address
how exterior lighting should be modeled for the baseline, and therefore
the default is that it should be modeled the same as the design and no
credit for savings could be taken
answer:
7. Yes, project teams can take credit for efficient exterior lighting
within ASHRAE 90.1 Appendix G. Credit may only be taken for the tradable
surfaces listed in ASHRAE 90.1-2004 Table 9.4.5. All other exterior
lighting must be modeled identically in the Baseline and Proposed case.
The Baseline case exterior lighting power allowance should be calculated
using the methodology outline in Section 9.4.5.
question:
9. DHW Usage Reduction Will USGBC for LEED 2.2. allow the approach to
claim domestic hot water energy cost reduction based on low flow
fixtures, relative to EPACT standard allowed fixture flows from earlier
LEED 2.1 rulings. Another approach would be to adopt 90.1-2004 addendum
a) revision to Table 3.1 Baseline 11. labeled as a revision to G4.3
under the older numbering convention.
answer:
9. No. Credit for saving water is already granted in the Water
Efficiency section of the LEED Rating System. The Domestic Hot Water
(DHW) loop will be sized for design flows and the PRM does not allow
credit for changing loop flows for DHW.