With the more stringent requirements of ASHRAE 90.1-2010 as the baseline, additional creativity and effort is required to achieve higher levels of energy efficiency under this credit.
Teams will need to take a concerted approach from the early design phase forward to optimize the building massing and envelope, reduce heating and cooling loads, and maximize daylighting opportunities, in order to make the selection and integration of high-efficiency lighting and HVAC systems practical and effective. However, the effort is worth it as this credit can provide long-term operational cost savings, as well as a significant number of points toward your LEED certification goals.
Yes, you may still factor in the estimated energy production of onsite renewable energy systems as a credit against the energy costs of the proposed building.
To achieve increasing levels of energy performance beyond the prerequisite standard to reduce environmental and economic harms associated with excessive energy use.
Establish an energy performance target no later than the schematic design phase. The target must be established as kBtu per square foot-year (kW per square meter-year) of source energySource energy is the total amount of raw fuel required to operate a building; it incorporates all transmission, delivery, and production losses for a complete assessment of a building's energy use. use.
Choose one of the options below.
Analyze efficiency measures during the design process and account for the results in design decision-making. Analysis can include energy simulation of efficiency opportunities, energy simulation analyses for similar projects, or published data from energy analyses performed for similar projects (such as AEDGs).
Analyze efficiency measures focused on load reduction and HVAC-related strategies; passive measures are acceptable. Project the potential energy savings and cost implications for all affected systems.
Follow the criteria in EA Prerequisite Minimum Energy Performance to demonstrate a percentage improvement in the proposed tenant project performance rating compared with the baseline.
Use any combination of the strategies in any or all of the categories below.
For base building systems that serve the project, as well as any applicable improvements that are part of the project, document compliance with the following according to base building type and climate zoneOne of five climatically distinct areas, defined by long-term weather conditions which affect the heating and cooling loads in buildings. The zones were determined according to the 45-year average (1931-1975) of the annual heating and cooling degree-days (base 65 degrees Fahrenheit). An individual building was assigned to a climate zone according to the 45-year average annual degree-days for its National Oceanic and Atmospheric Administration (NOAA) Division.. For projects outside the U.S., consult ASHRAE/ASHRAE/IESNA Standard 90.1–2010, Appendixes B and D, to determine the appropriate climate zone.
Interior Lighting Power (1–4 points)
Reduce connected lighting power density below that allowed by ASHRAE/IESNA Standard 90.1–2010, either using the space-by-space method or applying the whole-building lighting power allowance to the entire tenant spaceTenant space is the area within the LEED project boundary. For more information on what can and must be in the LEED project boundary see the Minimum Program Requirements (MPRs) and LEED 2009 MPR Supplemental Guidance. Note: tenant space is the same as project space.. Points are awarded according to Table 2.
Interior Lighting Controls (1–2 points)
Install daylight-responsive controls in all regularly occupied daylit spaces within 15 feet (4.5 meters) of windows and under skylights for at least 25% of the connected lighting load. Daylight controls must switch or dim electric lights in response to daylight illumination in the space.
Install occupancy sensors for at least 75% of the connected lighting load.
Equipment and Appliances (1–2 points)
Install ENERGY STAR appliances, office equipment, electronics, and commercial food service equipment (HVAC, lighting, and building envelope products are excluded from this credit) or performance equivalent for projects outside the U.S.. Calculate their percentage of the total (by rated-power) ENERGY STAR–eligible products in the project. Points are awarded according to Table 3.
Under v3, only new appliances/equipment being purchased for the project counted and had to be tracked for credit compliance. Is that still the case here? I cannot find specific language to it in the guide, addenda, or on here. In our project, we are assuming that much of our existing computer equipment would be brought with us.
Please advise. Thanks.
My assumption is that only new appliances and equipment need to be tracked in LEEDv4, similar to v2009. The language in the reference guide does not specifically call it out, but the "Changes from LEED 2009" section in the reference guide does not mention any changes to the requirements for Energy Star appliances. So I think the credit would apply only to new appliances.
I got a response from LEEDCoach on this topic, and thought I'd share here for clarity:
The forms for these Prerequisite and Credit in LEED Online ask for equipment that was part of the scope of work and ask for a narrative to "Describe the ENERGY STAR eligible equipment installed in the project that was not included in the project scope of work, and confirm that this equipment was procured prior to the project."
Hope that helps. I'm also posting this in the related prereq forum where someone else asked this same question.
Under option one for compliance (energy simulation), which measures can credit be taken for? Ex: Envelope, HVAC, Lighting, Process Loads, DHWDomestic hot water (DHW) is water used for food preparation, cleaning and sanitation and personal hygiene, but not heating., etc.
Also, how can one establish if LEED CI is right for a given project compared to LEED NC if the scope of the project may overlap.
The specific modeling protocol is spelled out in the Reference Guide. You can get credit for or penalized for the base buildingThe base building includes elements such as the structure, envelope, and building-level mechanical systems, such as central HVAC, and materials and products installed in the project (e.g., flooring, casework, wall coverings). systems under this protocol. You can claim savings for all energy end uses.
Follow this link for rating system selection guidance - http://www.usgbc.org/articles/rating-system-selection-guidance
Hi! Where's the dropdown for EAc3 Advanced Energy Metering? Thanks!
This is more of a statement, but I wanted to bring to attention the fact that the LEED CI v4 sample form on the usgbc website (below) for Optimize energy performance contains duplicates of the forms and calculators for the Minimum energy performance credit.
This question is in regards to the Optimize Energy Performance section, under the Prescriptive compliance method and more specifically the Equipment and Appliances credits.
My team and I are seeking clarification on some of the wording in the book which states "Calculate their percentage of the total (by rated-power) ENERGY STAR-eligible products in the project."
The first thing in question is the ENERGY STAR-eligible, which in this case we are referencing microwaves. Being that microwaves either cannot or have not received an energy star rating, would they even be considered eligible. And with that if they are not considered eligible, can they be excluded from the calculation regarding percentage of energy star products?
The second thing of interest is the rated-power verbiage. And we are merely just looking for more information on what exactly that means or what it is referring to. Any and all information is helpful and i thank you for your time.
Both of these subjects have been covered in the LEED v2009 forums for this credit. You might find some more detail there.
Yes only Energy Star eligible appliances are counted. Anything else is excluded.
Rated powerRated power is the nameplate power on a piece of equipment. It represents the capacity of the unit and is the maximum that it will draw. is usually expressed in watts.
The base buildingThe base building includes elements such as the structure, envelope, and building-level mechanical systems, such as central HVAC, and materials and products installed in the project (e.g., flooring, casework, wall coverings). for my project is an odd shape and there are a few zones which touch two building walls (for example, a conference room has one window which faces west and three windows which face southwest). How does USGBC define 'exposure'? It would be a bit excessive to design two zones in this conference room. Would it be appropriate to have one zone for this space?
Yes one would probably work and I would pick the predominate one.
My reference guide states that this credit is eligible for exemplary performanceIn LEED, certain credits have established thresholds beyond basic credit achievement. Meeting these thresholds can earn additional points through Innovation in Design (ID) or Innovation in Operations (IO) points. As a general rule of thumb, ID credits for exemplary performance are awarded for doubling the credit requirements and/or achieving the next incremental percentage threshold. However, this rule varies on a case by case basis, so check the credit requirements. on the Quick Reference table on page 17. It is also eligible for Regional Priority credit. On the LEED online site, it seems I have achieved an extra credit point automatically, which I understand to be the Regional Priority Credit. Exemplary Performance is attained by meeting 32% savings. Can I attain both the Regional Priority Credit and the Exemplary Performance credits and get essentially 2 extra bonus points?
Yes, you can earn EP and RP for the same credit.
We are looking to comply with this credit using the Prescriptive Compliance Path. My question is regarding the Daylighting Controls portion of the Interior Lighting Controls credit.
The Reference Guide says "Install daylight-responsive controls in all regularly occupied daylit spaces within 15 feet (4.5 meters) of windows and under skylights for at least 25% of the connected lighting load. Daylight controls must switch or dim electric lights in response to daylight illumination in the space. "
Is this "25% of the connected lighting load"
a) 25% of the project's TOTAL connected lighting load, OR
b) 25% of the connected lighting load in all regularly occupied daylit spaces
Can a project eligible for points under Base BuildingThe base building includes elements such as the structure, envelope, and building-level mechanical systems, such as central HVAC, and materials and products installed in the project (e.g., flooring, casework, wall coverings). Systems - Building Envelope, Opaque and Building Envelope, Glazing if they can meet most of recommendations from 50% AEDG? Our base building able to meet at least 80% and 60% of the requirement respectively.
Michael, I don't think so. The way these prescriptive requirements are set up, it's not meant to be a menu of choices—I think LEED wants you to meet all the requirements.
Can a project pursue the prescriptive compliance path if there is not a ASHRAE 50% Advanced Energy Design Guide that is specifically applicable to the base buildingThe base building includes elements such as the structure, envelope, and building-level mechanical systems, such as central HVAC, and materials and products installed in the project (e.g., flooring, casework, wall coverings). (i.e. it is greater than 100,000 SF, is not retail, is not a hospital and is not a school).
Amy, no—unfortunately those paths are limited to the specific building types that apply.
My project has the same issue, i.e., the base buildingThe base building includes elements such as the structure, envelope, and building-level mechanical systems, such as central HVAC, and materials and products installed in the project (e.g., flooring, casework, wall coverings). is a large office building.
However, the base building has received LEED precertification Gold, and it has also been awarded Green Mark Platinum (the highest in the local green building rating standard), can the project be exempted form filling ASHRAE 50% AEDG? Thanks.
I don't think that gives you any exemption to the requirements. You may not be eligible for the base buildingThe base building includes elements such as the structure, envelope, and building-level mechanical systems, such as central HVAC, and materials and products installed in the project (e.g., flooring, casework, wall coverings). points but could look at the remaining points not based on the AEDG.
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