Hi,
I am doing Energy Model for LEED CI Project under V3 2009 Rating System. The project is G+M+3 Floors. Our tenant spaces are located in 1st Floor. Tenant’s spaces are conditioned by packaged unit. Cooling capacities, air flow of FCU’s and lighting design are modified as per the tenant’s advice. Tenant level energy simulation has completed considering Appendix G. Here, I have modeled GF, MF, other than tenant spaces of 1st floor, 2nd floor & 3rd floor as simple box to get an impact as built.
Please help me by answering the questions.
1. In Baseline Energy Model, I have considered System 6 – Packaged VAV. Since, the total floor is 5 (G+M+3) and the conditioned areas is less than 150,000 Sq.ft. Shall I use G3.1.1A Table to determine the base case HVAC System?
2. In Baseline, I have modeled Heating capacity as 1.25% and cooling capacity as 1.15%. Is this correct?
3. In Baseline, the supply air is auto sized as per Appendix G. Is this correct.
4. In Baseline, the Envelopes are considered as per Existing design and the same has been considered in Proposed Case. Is this correct.
5. In Proposed case, the cooling capacity, supply air and lighting power density are considered as per the latest design documents. Is this correct?
6. Service hot water is not used in the project. So I have not considered this in energy end use. Is this ok or need to consider?
7. Whether Energy Model to be considered only for CI-2009 EAc1.3: Optimize Energy Performance—HVAC. If yes, how the points will be allocated to the project.
8. How the points are determined using ASHRAE 90.1-2007 Point Scale for LEED-CI v2009 Tenant-Level Energy Models.pdf. Because, we are getting 13% savings only from tenant level Energy Model and I am not find any points under EAc 1.3. As per the guideline (ASHRAE 90.1-2007 Point Scale for LEED-CI v2009 Tenant-Level Energy Models.pdf), our project is able to meet EA Credit 1.1 to 1.2: Optimize Energy Performance (6 points for 13%). Then how to meet other credits i.e. EA c 1.3 & 1.4.
SSN Energy Model
Mechanical Engineer5 thumbs up
August 20, 2017 - 3:21 am
could you help me on the avove?
Please.
Nik
Marcus Sheffer
LEED Fellow7group / Energy Opportunities
LEEDuser Expert
5907 thumbs up
August 22, 2017 - 10:58 am
1. Yes
2. Yes
3. Yes
4. Yes
5. Yes
6. Ok to exclude if no system is installed
7. Yes this is used for c1.3, 5 points for 15% and 10 points for 30% HVAC performance difference. There is also LEED Interpretation 10412 that allows the model to be used to document many of the energy credits and the prerequisite.
8. c1.3 and c1.4 are covered in this point scale. At 13% you do not appear to be able to earn points associated with those credits. You have to get to 30% to claim points associated with c1.3. You have to get to 19% to claim points associated with c1.4.
SSN Energy Model
Mechanical Engineer5 thumbs up
August 23, 2017 - 1:12 pm
Thanks for the reply.
Whether the same modeling results can be used for EA Prerequisite 2: Minimum Energy Performance? OR need to meet mandatory, prescriptive requirements as well to comply with EA P2.
Marcus Sheffer
LEED Fellow7group / Energy Opportunities
LEEDuser Expert
5907 thumbs up
August 23, 2017 - 1:18 pm
The model can be used for EAp2 compliance. You always need to meet the mandatory provisions. If modeling you don't need to meet the prescriptive requirements.
SSN Energy Model
Mechanical Engineer5 thumbs up
August 23, 2017 - 2:07 pm
We are not meeting the mandatory requirements. so, what we can do in this situation? can we use LEED Interpretation 10412 along with ASHRAE 90.1-2007 Point Scale for LEED-CI v2009 Tenant-Level Energy Models.pdf.
Since the project/tenant space is using existing envelope and existing Packaged Air conditioning syatem. Only LPD and air side syatem (supply cfm and fan power) has redesigned as I informed in earlier post.
Marcus Sheffer
LEED Fellow7group / Energy Opportunities
LEEDuser Expert
5907 thumbs up
August 23, 2017 - 2:08 pm
For CI projects I think you are only required to meet the mandatory provisions associated with the systems in your scope of work.