understanding leed for homes v4 - greenhome institute• complete the thermal enclosure system rater...

Understanding LEED for Homes v4A Nine Part Series

Module #4: EA Prescriptive

USGBC Education Provider

Formerly

Founded 2000Midwest LEED for Homes Provider 501(c)3 non‐profit; mission:

Empowering people to make more informed and sustainable choices building and remodeling of the places we live.

Moderator

Brett Little, LFA,APH,GHPExecutive DirectorGreenHome InstituteGrand Rapids, [email protected]

EA Session Sponsor

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About the Presenter

Jay Hall, PhDJay Hall & Associates, Inc.Annapolis, [email protected]

LEED AP HomesLEED for Homes Green RaterLEED Faculty (former)HERS Rater, ENERGY STAR Partner

Target Audience

1. Familiarity with LEED for Homes v20082. Limited exposure to LEED for Homes v43. Additional Support / Resources / Links

• v2008• v4

Agendafor Whole Workshop

Module 1• Overview‐ Summary of Changes• IP / LT• Tools

Module 2• SS

Module 3• WE

Module 4• EA – Prescriptive

Module 5• EA ‐ Performance

Module 6• MR

Module 7• EQ

Module 8• IN / RP / AE / Process

Module 9• Activity ‐ Low Rise• Activity ‐Mid‐Rise• Summary / Next Steps

Agenda Module 4

• Review of WE

• EA Prereqs andCredits

• Apply EA to Projects

• Wrap Up

Learning Objectives

Student participants will be able to:• Describe EA changes in v4 Rating System from

v2008.

• Identify EA prereqs and credits.

• Apply EA to projects.

• Fill‐out the v4 workbook

Review of Module #3Water Efficiency (WE)

Two PathsPrescriptive (10 pts.)NEW! Performance (12 pts.)

New PrereqWE P1 Water Metering

Point FloorRemains at 3 pts.

Overall Point ChangeChanged from 15 pts to 10 / 12 pts. Don’t be Afraid of Change

Overall Impact: Increased Stringency

Water Efficiency(WE)

Water Efficiency (WE)

WE P1 Water Metering Exempt: Gut Rehabs Exempt: Homes w/ Well Water

WE C1 Total Water Use (12 Pts.) New Indoor Calculator New Outdoor Calculator

WE C2 Indoor Water Use (6 Pts.) Lower flow rates required

WE C3 Outdoor Water Use (4 Pts.) Must reduce turf AND Use native adapted plants

Only One (or Two) Credits!

Review of Module #3 (cont’d)

http://www.epa.gov/watersense/docs/home_final_waterbudget508.pdf

Q#1. Do Projects Using the WE Credit: Total Water Use (Performance) Path need Pre‐Approval?Answer: No

Q#2. How in non‐vegetated areas (e.g. mulch, gravel, hardscapes) to be treated in the landscape area calculations in WE C1 and WE C3?Answer: Exclude from landscape area calculations.

Q#3. How are HIGH, MEDIUM and LOW defined in the WaterSense Water Budget Tool ?Answer: From WaterSense New Home Program Guidance

HIGH: Species that need more water than most plants (or use 70 to 90 percent of ETo). MEDIUM: Species that need a typical amount of water (use 40 to 60 percent of ETo). LOW: Species that need less water than most plants (or use less than 30 percent of

Eto).

Credit # Credit Name Single Family (Max. Points)

Midrise (Max. Points)

v2008 v4 v2008 v4 v2008 v4

WE 1.1 Rainwater Harvesting 4 *

5

*

WE 1.2 Graywater Reuse 1 * *

WE 1.3 Municipal Recycled Water or 3 * *

WE 2.1 High Efficiency Irrigation 3 N/A2

N/A

WE 2.2 Third Party Inspection 1 N/A N/A

WE 2.3 WE C1 Reduce Demand by > 45% or 4 or 2

WE 3.1 High Efficiency Fixtures 3 N/A

WE 3.2WE C3

Very High Efficiency Fixtures or 66

WE 3.3 Water Efficient Appliances N/A 2

Total 15 10/12 15 10/12

WE P1 Water Metering Prereq

WE C1 Total Water Use or 12

WE C2 Outdoor Water Use (Landscaping) 4

Note * Calculation required in V 4.0, WE C1

Think About It…

The average US home uses $2,024 of energy per year.

Source: US DOE EIA

How much of this is for Lighting and Appliances?

a) 20%b) 30%c) 40%d) 50%

?

Energy and Atmosphere

(EA)

Prereqs

CreditsHomes 9 Pts.Mid‐Rise 7 Pts

Credits28 Pts.(Homes Only)

EA CreditAnnual Energy UseMax: Homes 29

Mid‐Rise 30

Overview of EA

New PrereqsEA P1 ENERGY STAR for Homes v 3.0EA P2 Energy Metering

Minimum Point Floor 8 points in LT and EA combined.

Moved InEA P3 Education of Occupant

Point Change None (38 pts.)

Don’t be Afraid of Change

Overall Impact: Beneficial for small homes

Energy And Atmosphere

Prescriptive Path EA P1 Performance of ENERGY STAR Homes

EA P2 Energy Metering

EA P3 Education of Homeowner / Tenant

EA P4 Home Size

EA P1 Minimum Energy Performance Homes

Prerequisite Applies to • Homes & Midrise

Intent • To improve the building’s overall

energy performance and reduce its greenhouse gas emissions.

Requirements Case 1. HomesCase 2. Midrise

EA P1 Minimum Energy Performance Homes (cont’d)

RequirementsCase 1. HomesMeet ALL of the following requirements:

• 1. Meet the requirements of ENERGY STAR for Homes, version 3 • Complete the thermal enclosure system rater checklist, the HVAC system quality

installation rater and contractor checklists, and the water management system builder checklist.

• Certified Passive House projects automatically meet the thermal enclosure system rater checklist requirement.

• Achieve a HERS index rating at or below the HERS index target (or USGBC‐approved equivalent for projects outside the U.S.) or meet the requirements of the ENERGY STAR for Homes version 3 Prescriptive Pathway, which includes meeting or exceeding all components of the ENERGY STAR Reference Design.

• At least one of the following appliances must be ENERGY STAR qualified (or performance equivalent for projects outside the U.S.) and installed in each dwelling unit: refrigerator; dishwasher; or clothes washer.

• All duct runs must be fully ducted (i.e., building cavities may not be used as ducts).


Existing portions of an existing building are given the following allowances:

Thermal Enclosure System Rater Checklist 2.1. Slab insulation is strongly encouraged but not required to meet or exceed 2009 IECC levels. 4.1. Attic insulation at the intersection of existing roof and existing exterior walls does not have to meet

R‐value requirements. 4.4.5e. Advanced framing is not required on existing framed walls, 5.2.1. Existing sill plates on top of concrete are not required to be placed on a foam gasket.

Water‐Managed Site and Foundation 1.3. A capillary break under an existing slab is not required unless there are visible signs of moisture

damage on the slab floor. 1.5. Exterior below‐grade walls are not required to be damp‐proofed on the exterior surface unless there

are visible signs of moisture damage on the interior of the wall. 1.8 Drain tiles surrounded with clean gravel and fabric filter are not required for existing slabs, unless

there are visible signs of moisture damage on the slab floor 2, 3. Water‐managed wall and roof assembly requirements are not required for existing walls or roofing

unless there are signs of moisture damage related to vulnerabilities in the walls or roof


RequirementsCase 2. MIDRISE Meet both the whole‐building energy simulation and commissioning requirements:

Whole‐Building Energy Simulation • Demonstrate a 5% improvement over the baseline building performance rating.

Calculate the baseline according to the building performance rating method of USGBC’s residential midrise simulation guidelines, which is based on ANSI/ASHRAE/IESNA Standard 90.1–2010, Appendix G (with errata), or USGBC‐approved equivalent standard for projects outside the United States, using a computer simulation model for the whole‐building project.

• Comply with the mandatory provisions of ANSI/ASHRAE/IESNA Standard 90.1–2010 (with errata).

• Comply with USGBC’s residential midrise simulation guidelines. • Include all energy consumption and energy costs associated with the building project. • Compare the design case with a baseline building that complies with Standard 90.1–

2010, Appendix G (with errata but without addenda).


RequirementsCase 2. MIDRISE (cont’d)

AND Commissioning

Option 1. Commissioning using ENERGY STAR Protocols.Meet the ENERGY STAR Qualified Multifamily High Rise Buildings Testing and Verification (T&V) Protocols.

OR Option 2. Commissioning using Prescriptive Path. Meet ALL of the following:

1. Reduced Heating and Cooling Distribution System Losses for In‐unit HVAC 2. Fundamental Commissioning of Central HVAC Systems 3. Construction Document Specifications 4. LEED for Homes Multifamily Midrise Thermal Enclosure Inspection Checklist


1. Reduced Heating and Cooling Distribution System Losses for In‐unit HVAC Limit the duct air leakage rate, testing for leakage to outside the unit or conducting a total duct leakage test. The tested leakage‐to‐outside rate must be less than 4.0 cfm25 per 100 square feet (1.2 cmm at 25 Pascals per 100 square meters) of conditioned floor area for each installed system, verified by a qualified energy rater. For units smaller than 1,200 square feet (110 square meters) tested leakage must be less than 6.0 cfm25 per 100 square feet (1.7 cmm at 25 Pascals per 100 square meters). Total duct leakage for in‐unit systems must not exceed 8 cfm25 per 100 square feet (2.4 cmmat 25 Pascals per 100 square meters) of conditioned floor area. Testing is waived if the air‐handler unit and all ductwork are visibly within the unit’s envelope (i.e., no ducts are hidden in walls, chases, floors, or ceilings).

2. Fundamental Commissioning of Central HVAC Systems Meet the performance testing and ongoing maintenance requirements of EA Prerequisite Fundamental Commissioning and Verification of LEED v4 for New Construction for central commercial heating, cooling, water heating and ventilation systems. The requirements include the following: • Develop a system test procedure. • Verify system test execution. • Maintain an issues and benefits log throughout the commissioning process. • Document all findings and recommendations and report directly to the owner throughout the

process. • Prepare and maintain a current facilities requirements and operations and maintenance plan

documenting information necessary for efficient building operations


3. Construction Document Specifications • Include the following details in construction and bid documents: • Elements to be sealed (construction and bid documents). List all elements identified in

ASHRAE 90.1–2007, Section 5.4.3.1, or applicable state or local codes, in addition to any site‐specific elements identified during plan review, and include the items in the LEED for Homes multifamily midrise thermal enclosure inspection checklist (see below). Show locations to be sealed as well as acceptable methods and materials.

• Air barrier sheet (bid documents). Show the air barrier continuity through the various conditions of the exterior enclosure; this information can serve as an index to details.

• Compartmentalization sheet (bid documents). Show the continuity of fire and smoke barriers around each apartment and between corridors, stairs, and common areas; this information can serve as an index to details.

4. LEED for Homes Multifamily Midrise Thermal Enclosure Inspection Checklist • Have a third party–qualified energy rater verify each item on the checklist. The LEED

checklist is based on the ENERGY STAR for Homes, version 3 (Rev. 02) thermal enclosure rater checklist, Sections 2, 3, and 5.

• Certified Passive House projects automatically meet the thermal enclosure inspection checklist requirement.

Verification Measure

Upload Builder’s Option Package, and ENERGY STAR for Homes inspection checklist

Verify appliances are installed.

Verify duct runs are fully ducted

+1.5 point EA C14 Appliances

+1.0 point WE C2 Indoor Water Use1+1.0 point EQ C2 Supply Air Flow Testing+1.0 point EQ C2 (3) Pressure Balancing

+1.0 point EA C5 HVAC Start‐Up Credential

ENERGY STAR for Homes v3.0

+5.5 Total

EA P2 Energy Metering


Intent • To support energy efficiency efforts by

monitoring and benchmarking energy use over time.

Requirements Case 1. Single Family Case 2. Multifamily

Gas and

Electric

Case 1. Single Family • Install whole‐house electric and gas meters, as applicable. • Encourage homeowners or tenants to share energy usage data with USGBC

via a USGBC‐approved third‐party by describing the benefits of participation in the Homeowner Education Manual.

Case 2. Multifamily • Install an electricity meter or submeter for each residential unit and • Install a gas meter for the entire building, or a gas meter or sub‐meter for

each unit. • Single room–occupancy units, transitional and temporary housing, and

designated supportive housing buildings do not need an energy meter in each unit but must have a whole‐building energy meter.

• Encourage homeowners or tenants to share energy usage data with USGBC via a USGBC‐approved third party by describing the benefits of participation in the Homeowner Education Manual.

EA P2 Energy Metering (cont’d)

EA P3 Education of Homeowner, Tenant, or Building Manager


Intent • To sustain the performance of the home by training its occupants in the operation

and maintenance of LEED features and equipment.

Requirements • Provide to all individuals or organizations responsible for ongoing maintenance of

the home (e.g., occupants, building managers, maintenance contractors) an operations and maintenance manual, binder, or CD that includes all the following items:

EA P3 Education of Homeowner, Tenant, or Building Manager (cont’d)

• the completed checklist of LEED for Homes features; • a copy of each signed accountability form; • copies of all ENERGY STAR for Home, version 3, checklists; • product manufacturers’ manuals for all installed equipment, fixtures, and appliances; • general information on efficient use of energy, water, and natural resources; • operations and maintenance guidance for any installed equipment, including space

heating and cooling, mechanical ventilation, humidity control, radon protection, renewable energy, and irrigation, rainwater harvesting, or graywater systems (following 2009 EPA WaterSense Single‐Family New Home Specifications, item 5.0, Homeowner Education);

• guidance on occupants’ activities and choices, including cleaning materials and methods, water‐efficient landscaping, integrated pest management, effects of chemical fertilizers and pesticides, irrigation, lighting selection, and appliance selection;

• information on local green power options; and • information on sharing utility data with USGBC via a USGBC‐approved third party.

In addition, conduct a minimum one‐hour walkthrough of the home with the occupants.

Same as

v2008

`

MultifamilyFor buildings with building managers, include the building manager.

The walkthrough must feature the following:

• identification of all installed equipment;

• instruction in how to use and operate the equipment; and

• information on its maintenance.

EA P3 Education of Homeowner, Tenant, or Building Manager (cont’d)

EA P4 Home Size

Prerequisite applies to: • Homes

Intent • Reduce energy consumption and greenhouse gas emissions by designing more

compact living spaces.

Requirements

• Earn 1 point for every 4% decrease in conditioned floor area compared with the ENERGY STAR for Homes, version 3, reference home (Table 1).

• Buildings that are larger than the reference home lose 1 point for every 4% increase in conditioned floor area.

• Projects cannot exceed the maximum number of points in the EA section.

EA P4 Home Size (cont’d)

Table 1. Conditioned floor area of reference home, by number of bedrooms

For multifamily buildings, home size includes only in‐unit space.

How is the EA Prereq Home Size accounted for in LH v4 scoring?

a) The certification threshold is adjusted.

b) This Preq is awarded points.

c) Points are added to the EA credit Annual Energy Use.

d) Points are added to the EA Total.

Think about it…


Verify home size adjustment calculation (including ensuring that only appropriate rooms are counted as bedrooms), or perform home size adjustment calculation for each building.

Verify building area for each building.

Total

Small Habitat Home

No of Bedrooms: 3

Floor Area: 1,200 Sq. Ft.

ESH Benchmark Size: 2,200 Sq. Ft.

Percent Difference:= ( 2,200 – 1,200) / 2,200= 45%

# of EA P4 Points:(1 point per 4% difference)

= 45% / 4%= 11 points

v2008 = ‐10 points

Credit Example:EA P4 Home Size

Large Custom Home

No of Bedrooms: 5

Floor Area: 5,500 Sq. Ft.

ESH Benchmark Size: 3,400 Sq. Ft.

Percent Difference:= ( 3,400 – 5,500) / 3,400= ‐ 62%

# of EA P4 Points:(1 point per 4% difference)

= ‐ 62% / 4%= ‐15.5 points

V2008 = 17 points


(EA)

Prereqs




Mid‐Rise 30

Energy And Atmosphere (cont’d)

Prescriptive Path (cont’d)EA C2 Efficient Hot Water Distribution

System EA C3 Advanced Utility Tracking EA C4 Solar‐Ready Design EA C5 HVAC Start‐Up Credentialing

EA C2 Efficient Hot Water Distribution System

Points • Homes and Midrise (2‐5 points)

Intent • To reduce energy consumption and the burden on water supply and wastewater

systems by increasing the efficiency of hot water distribution.

Requirements Option 1. Efficient Hot Water Distribution (2 points)

Path 1. Maximum Allowable Pipe Length

OR Path 2. Maximum Allowable Pipe

OR Option 2. Performance Test (3 points)Case 1. Hot water source is a water heater or boiler with no circulation loop or heat traced pipe; or in

multifamily buildings a central circulation loop or heat traced pipe.

Case 2. Hot water source is a circulation loop or heat traced pipe serving a single unit or house

AND/OR Option 3. Pipe Insulation (2 points)

v2008 2 Point

Changed from v2008

EA C2 Efficient Hot Water Distribution System (cont’d)

Option 1. Efficient Hot Water Distribution (2 points) Design and install an energy‐efficient hot water distribution system, based on either

maximum pipe length requirements (Path 1) or maximum pipe volume limits (Path 2). The source of hot water is assumed to be a water heater, boiler, circulation loop piping,

or electric heat‐traced piping. Multiple water heaters and multiple distribution systems may be used to comply with

this credit. Systems that use heat traces that serve a single unit or house are awarded only half

credit. All heat traced piping must be insulated.

Path 1. Maximum Allowable Pipe Length Do not exceed the maximum allowable pipe length from the source of hot water to the

termination of the fixture supply pipe, as listed in Table 1a or Table 1b. If a branch consists of more than one size of pipe, use the largest size when determining

the maximum allowable length. Branch length requirements do not apply to cold water demand loads (e.g., toilets),

tubs without showerheads, or stovetop pot‐fillers.


Table 1a. Maximum length of pipe

V2008 20 10+ 2 x ceiling height + occupant control


Table 1b. Maximum length of pipe (SI)

Option 1 (cont’d)OR Path 2. Maximum Allowable Pipe Volume Do not exceed a maximum volume of hot or tempered water of:

64 ounces (1.89 L) from a water heater or boiler with no circulation loop or heat traced pipe or in multifamily buildings a central circulation loop or heat traced pipe to the fixture, or

24 ounces (0.71 L) for hot water from a circulation loop pipe or an heat‐traced pipe serving a single unit or house to the fixture.

Pipe volume is the sum of the internal volumes of pipe, fittings, valves, meters, and manifolds between the source of hot water and the termination of the fixture supply pipe. To determine the volume, refer to Table 2, which lists the volumes for specific types of tubing.

Branch volume requirements do not apply to cold water demand loads (e.g., toilets), tubs without showerheads, or stovetop pot‐fillers.



Table 2. Volume of water distribution pipes, by tubing type


Option 2. Performance Test (3 points) Case 1. Hot water source is a water heater or boiler with:

• No circulation loop or heat traced pipe; or • Multifamily buildings a central circulation loop or heat traced pipe.

To minimize wasted water before hot water is delivered, using EPA WaterSense testing procedures, verify that no more than:

• 0.5 gallons (1.9 liters) of water is stored in any piping between the hot water source and any fixture,

and• 0.6 gallons (2.3 liters) of water is collected from the hot water fixture before hot water is

delivered.

Heat traces are only allowed in situations to prevent freezing.

Projects that meet WaterSense Labeled New Homes requirements automatically achieve this credit.

http://www.epa.gov/watersense/docs/hw_distribution_guide.pdf


Option 2 (cont’d)OR Case 2. Hot water source is a circulation loop or heat traced pipe serving a single unit or house

• To minimize wasted water before hot water is delivered, using EPA WaterSense testing procedures, verify that no more than 0.25 gallons (1 liter) of water can be collected from the hot water fixture furthest from the recirculation loop,

• Systems that use heat traces that serve a single unit or house are only awarded half credit. All heat traced piping must be insulated.


For Paths 1 and 2: Pumps and Controls for Hot Water Circulation Loops

Circulating systems must meet the following requirements.

1. Circulating pump may not operate continuously, on a timer control, or on a water temperature (aquastat) sensors. Gravity and thermo‐syphon circulation systems are prohibited.

2. Circulating pump must be demand activated by a momentary contact switch, motion sensor, flow switch, door switch or voice command.

3. After the pump starts, the controls shall allow the pump to operate until the water temperature in the return pipe rises not more than 10ºF (6 ºC) above the initial temperature of the water in the pipe. Controls shall further limit the water temperature to a maximum of 105ºF (40 ºC). Controls shall limit pump operation to not more than 5 minutes per activation in the event that both means of shutting off the pump have failed.

4. Circulating hot water systems must be provided with an automatic or readily accessible manual switch to turn off the hot water circulating pump when not in use.


AND/OR Option 3. Pipe Insulation (2 points) Install at least R‐4 insulation on all domestic hot water piping, including

subslab pipes. Insulation on all piping elbows and tees must adequately insulate changes in direction.

Run buried piping in a slab or below grade through a protective, waterproof raceway, channel, sleeve, or path whose internal dimensions and changes of direction are large enough that the piping and insulation can be removed and replaced without damaging the piping’s dimensional integrity.

The waterproof sleeve is not required for below‐grade piping if the insulation manufacturer stipulates that the pipe insulation will maintain its insulating value in underground applications in damp soil when installed according to the manufacturer's instructions. This exception does not apply to piping that runs through or under building slabs.

V2008: R‐4 (1point); IECC 2012: R‐3

EA C3 Advanced Utility Tracking

Points • Homes & Midrise(1–2 points)

Intent • To support energy efficiency efforts through real‐time monitoring of energy and

water use.

Requirements

Case 1. Single Family Option 1. Electric and Water (1 point)

AND/OR Option 2. Third‐Party Utility Reporting (1 point)

Case 2. Multifamily

Option 1. Electric and Water (1 point)

AND/OR Option 2. Third‐Party Utility Reporting (1 point)Path 1. Whole‐Building Master Meter Path 2. Individual Unit Meters

EA C3 Advanced Utility Tracking (cont’d)

Case 1. Single Family Option 1. Electric and Water (1 point) Meet one of the following: • Install a permanent energy‐monitoring system that records at

intervals of one hour or less and is equipped with the ability to transmits data to the homeowner or occupant at a remote location (e.g., computer, in‐house display).

OR

• If the project has an automatic in‐ground irrigation system and the landscape irrigated area is larger than 1,000 square feet (93 square meters), install a submeter to monitor all irrigation system components.

AND/OR Option 2. Third‐Party Utility Reporting (1 point) • The homeowner must share all applicable utility data with USGBC via a

USGBC‐approved third‐party before the project team submits its application for certification.



Case 2. Multifamily Option 1. Electric and Water (1 point) • In each unit, install a permanent energy‐monitoring system that

records at intervals of one hour or less and is equipped with the ability to transmit data to the homeowner or occupant at a remote location (e.g., computer, in‐house display).

OR • If the project has an automatic in‐ground irrigation system and the

landscape irrigated area is larger than 1,000 square feet (93 square meters), install a submeter to monitor all irrigation system components.


Case 2. Multifamily (cont’d)AND/OR Option 2. Third‐Party Utility Reporting (1 point)

Path 1. Whole‐Building Master Meter

• The building owner must share all applicable utility data with USGBC via a USGBC‐approved third‐party before the project team submits its application for certification.

OR Path 2. Individual Unit Meters

• At least 50% of unit owners or occupants must share all applicable utility data with USGBC via a USGBC‐approved third‐party before the project team submits its application for certification.

https://www.wegowise.com/

EA C4 Active Solar‐Ready Design

Points • Homes Only (1 point)

Intent • To reduce energy consumption and greenhouse gas emissions by

designing to maximize opportunities for solar design.

Requirements Option 1. Photovoltaic‐Ready Design (1 point) AND/OR Option 2. Solar Direct Hot Water–Ready Design (1 point)

EA C4 Active Solar‐Ready Design (cont’d)

Option 1. Photovoltaic‐Ready Design (1 point) • A project team that installs a photovoltaic (PV) system that meets

the requirements of EA Credit Renewable Energy is not eligible for this credit.

• Meet EPA’s solar photovoltaic specifications for a renewable energy–ready home.

• Provide detailed information about such systems in the homeowner education manual so that future occupants can install an active PV system.

http://www.energystar.gov/index.cfm?c=rerh.rerh_index

EA C4 Active Solar‐Ready Design (cont’d)

AND/OR Option 2. Solar Direct Hot Water–Ready Design (1 point)

• A project team that installs a solar direct hot water (DHW) system that meets the requirements of EA Credit Efficient Domestic Hot Water Equipment is not eligible for this credit.

• Meet EPA’s solar water heating specifications for a renewable energy–ready home.

• Provide detailed information about such systems in the homeowner education manual so that future occupants can install an active solar DHW system.

http://www.energystar.gov/index.cfm?c=rerh.rerh_index

EA C5 HVAC Start‐Up Credentialing

Points• Homes ONLY (1 point)

Intent• To reduce energy consumption by ensuring that heating and cooling systems

operate at peak efficiency.

Requirements • Have all heating, cooling, and ventilation systems commissioned by a technician

with North American Technician Excellence certification, HVAC contractor credentialed by an EPA‐recognized HVAC Quality Installation Training and Oversight Organization (H‐QUITO) (or equivalent as defined by USGBC).

• The technician must complete the ENERGY STAR for Homes, version 3, HVAC system quality installation contractor checklist, or equivalent as defined by USGBC.

Note: Required under ESH v3


(EA)

Prereqs




Mid‐Rise 30

Prescriptive Path (cont’d)EA C6 Building Orientation for Passive Solar EA C7 Air InfiltrationEA C8 Envelope InsulationEA C9 Windows EA C10 Space Heating and Cooling Equipment EA C11 Heating and Cooling Distribution Systems EA C12 Efficient Domestic Hot Water Equipment EA C13 Lighting EA C14 High‐Efficiency Appliances EA C15 Renewable Energy

Energy And Atmosphere (cont’d)

EA C6 Building Orientation for Passive Solar

Points• Homes ONLY (3 points)

Intent • To reduce energy consumption and greenhouse gas emissions by designing to

maximize opportunities for solar design.

Requirements Meet all of the following requirements:

• The south‐facing glazing area is at least 50% greater than the sum of the glazing area on the east‐and west‐facing walls.

• The east‐west axis of the building is within 15 degrees of due east‐west.

• At least 90% of the south‐facing glazing is completely shaded (by awnings, overhangs, plantings) at solar noon on the summer solstice and unshaded at noon on the winter solstice.

In areas south of 25 degrees of latitude or where topography significantly impacts insolation, orientation may be adjusted to meet local conditions provided the team provides documentation to demonstrate that its building orientation decision is based on solar and meteorological data for the site.

v2008 1 Point

Same as v2008

EA C7 Air Infiltration

Points • Homes ONLY (1–2 points)

Intent • To minimize waste of energy caused by uncontrolled air leakage into and from

conditioned spaces.

Requirements Case 1. Single Family

• Meet the air leakage requirements shown in Table 1 or Table 2.

• The rate of air leakage to outside must be tested and verified by a qualified energy rater.

Case 2. Multifamily • Meet the air leakage requirements shown in Table 1 or Table 2. • The rate of air leakage to outside must be tested and verified by a qualified energy rater. • Meet the requirements for leakage to outside the conditioned envelope for each dwelling unit,

unless the whole building can be entirely and sufficiently depressurized by a blower door(s).

v2008 3 Points

Similar to v2008, higher bar

EA C7 Air Infiltration (cont’d)

V2008CZ 1‐2 CZ 3‐4 CZ 6‐75.0 4.25 3.53.0 2.5 2.0

New Metric:Cfm50 per Sq. Ft. of Envelope

New Metric:SI Units

EA C8 Envelope Insulation

Points • Homes (1–2 points)

Intent • To conserve energy by selecting and installing insulation to minimize heat transfer

and thermal bridging.

Requirements • Select insulation whose R‐value exceeds the requirements listed in the 2012

International Energy Conservation Code (IECC), Chapter 4, or local code, whichever is more stringent.

• Do not include thermal mass or infiltration effects in the R‐value calculation.

• Points are awarded according to Table 1.

v2008 2 Points


Table 1. Points for exceeding code requirements for R‐value

• Install the insulation to meet the Grade I specifications set by the RESNET Home Energy Rating Standard.

• Installation must be verified by a qualified energy rater conducting a pre‐drywall thermal enclosure inspection.

EA C8 Envelope Insulation (cont’d)

V2008

N/A

5%

EA C9 Windows

Points • Homes ONLY (1.5–3 points)

Intent • To maximize the energy performance of windows.

Requirements• Design and install windows, skylights, and glass doors whose ratings from the National

Fenestration Rating Council exceed the requirements in the ENERGY STAR for Homes, version 3, prescriptive pathway, as shown in Tables 1–3.

• Use the average window ratings, average skylight ratings, and average exterior door ratings.

• Determine the window‐to‐floor‐area (WFA) ratio by calculating the total window area in the above‐grade conditioned floor area.

• All skylight window areas count toward the WFA ratio.

• For decorative glass, the project team may exclude up to 0.75% of the WFA ratio from the calculations.

v2008 3 Points

Similar to v2008, Higher Bar

EA C9 Windows (cont’d)

If the WFA ratio is 15% or more, the following additional requirements apply:

• In climate zones 4–8, homes with a WFA ratio of 15% or more must meet a more stringent U‐factor requirement:

U‐factor = (0.15 / WFA) * (U‐factor from Table 1)

• In climate zones 1–3, homes with a WFA ratio of 15% or more must meet a more stringent solar heat gain coefficient (SHGC) requirement:

SHGC = (0.15 / WFA) * (SHGC from Table 1)

Project teams that achieve EA Credit Building Orientation for Solar Design are exempt from the requirements for window SHGC.

EA C9 Windows (cont’d)

Table 1. Points for exceeding baseline window ratings

Table 2. Points for exceeding baseline skylight ratings

Table 3. Points for exceeding baseline door ratings

V2008CZ 3 CZ 4 CZ 5‐80.35 0.35 0.310.35 0.40 Any0.32 0.32 0.280.30 0.40 Any

EA C10 Space Heating and Cooling Equipment


Intent • To reduce energy consumption associated with the heating and cooling system.

Requirements • Design and install HVAC equipment that is more efficient than the equipment

required by the ENERGY STAR for Homes, version 3, prescriptive pathway. • Points are awarded according to Table 1. • Any piping designed as part of a heat pump system to carry water that is well

above (or below) the thermostatic temperature settings in the home must have R‐4 or better insulation.

• Refrigerant piping must be insulated to R‐6 or better on the air‐conditioning mode suction line or the heat‐pump mode discharge line.

v2008 4 Points


IECC 2012: R‐3

IECC 2012: R‐3

EA 10 Heating and Cooling Equipment (cont’d)

Table 1. Points for HVAC equipment that exceeds Energy Star requirements

V2008

AC Gas14

9215

94

V2008

AC Gas15

9016

92

EA C11 Heating and Cooling Distribution Systems


Intent • To minimize energy loss to thermal bridges and leaks in the heating and

cooling distribution system.

Requirements Case 1. Forced‐Air System Option 1. Ductwork in Conditioned Space (3 points)OR Option 2. Ductwork in Unconditioned Space (2 points)

Case 2. Hydronic System (2–3 points)

v2008 3 Points


EA C11 Heating and Cooling Distribution Systems (cont’d)

Requirements Case 1. Forced‐Air System Option 1. Ductwork in Conditioned Space (3 points)

• Duct leakage testing is waived if the following conditions are met: • The air‐handler unit and all ductwork are located entirely within

conditioned spaces. • The envelope is airtight; 2 points are earned in EA Credit: Air

Infiltration.

• Ductless systems with air circulation blowers qualify. • This case is not available for multifamily projects whose

ductwork runs through spaces between units: interstitial space is considered outside the thermal envelope of the unit.


Requirements Case 1. Forced‐Air System Option 2. Ductwork in Unconditioned Space (2 points) Large Homes or Multifamily Units For homes or multifamily units of 1,200 square feet (110 square meters) or more,

limit the rate of duct air leakage to outside the conditioned envelope. For each installed system, the tested duct leakage rate must not exceed 3.0 cfm at 25

Pascals per 100 square feet (0.9 cmm at 25 Pascals per 100 square meters) of conditioned floor area, verified by the qualified energy rater.

Small Homes or Multifamily Units For homes or multifamily units smaller than 1,200 square feet (110 square meters),

limit the rate of duct air leakage to outside the conditioned envelope. For each installed system, the tested duct leakage rate must not exceed 4.0 cfm at 25

Pascals per 100 square feet (1.2 cmm at 25 Pascals per 100 square meters) of conditioned floor area, verified by the qualified energy rater.

v2008: 3.0 cfm25/100 SF (1 pt.) 1.0 cfm25/100 SF (2 pt.)


Requirements (cont’d)Case 2. Hydronic System (2–3 points)

• Keep the system (including boiler and distribution pipes) entirely within the conditioned envelope (2 points).

• For an additional point, install an outdoor reset control that modulates distribution water temperature based on the outdoor air temperature (1 point).

Same as v2008

EA C12 Efficient Domestic Hot Water Equipment


Intent • To reduce the energy consumption associated with domestic hot water by

improving the efficiency of the water heater.

Requirements • Install an ENERGY STAR–qualified water heater (1 point), or• Install a solar water heater that, in combination with an ENERGY STAR

water heater, meets at least: • 40% of the annual domestic hot water (DHW) load (Table 1). (2 points), or • 60% (3 points)

• Projects outside the U.S. may use a performance equivalent to ENERGY STAR

v2008 3 Points

Almost identical to v2008

EA 12 Efficient Domestic Hot Water Equipment (cont’d)

Table 1. Points for high‐efficiency water heater

.

1.52

EA C13 Lighting


Intent • To reduce the energy consumption associated with interior and exterior

lighting.

Requirements Case 1. Single Family Option 1. Indoor Lighting (1.5 points)Option 2. Exterior Lighting (0.5 point)

Case 2. Multifamily Option 1. Indoor Lighting (1.5 points) Option 2. Exterior Lighting (0.5 point)

v2008 3 Points

Substantially different from v2008

EA C13 Lighting (cont’d)

Requirements Case 1. Single Family Option 1. Indoor Lighting (1.5 points) • Install high‐efficacy lighting. • Meet or exceed the requirements for lighting power density for hard‐wired

fixtures, as listed in Table 1.

Table 1. Points for reducing lighting power density


The proposed fixtures used to calculate energy savings must be capable of meeting the recommended light levels (weighted average footcandles) in the Illuminating Engineering Society Lighting Handbook, 9th edition, for the given space type.

Either calculate the needs for each space type, or use 16 as the weighted average footcandles for the home.

In calculating lighting power density, follow these guidelines: • Use a lighting power density of 1.1 W per square foot (11.8 W per square meter) for

rooms or portions of any rooms with less than the required hardwired lighting. • Account for all hard‐wired fixtures in the home, including the garage and exterior lights

(whether affixed to the home or freestanding). • Do not include portable table and floor lamps, appliance lights, or landscape lights. • Include step lights and undercabinet and cabinet lights. • For standard incandescent (a‐line medium screw base) bulbs,

assume 64 watts per socket. • For LED and Xenon lights, use actual wattages. • For fluorescent lighting, calculate wattage based on the assumptions in Table 2

or use the actual wattages installed.

EA 13 Lighting (cont’d)

Table 2. Assumptions for fluorescent bulb wattage

Credit Example EA C13 Lighting (Option 1: Indoor)

Conditioned Floor Area = 1,611 Sq. Ft.

Wattage Allowance (from Table 1)1,611 * 0.72 = 1,160 watts (0.5 pt.)

1,661 * 0.60 = 967 watts (1.0 pt.)

1,611 * 0.48 = 773 watts (1.5 pts)

Credit Example (cont’d)EA C13 Lighting (Option 1: Indoor)

Credit Example (cont’d) EA C13 Lighting (Option 1: Indoor)

Actual WattageInstalled Fixtures

820 Watts

+ Adjustment for Bedroom #3= 144 Sq. Ft. * 1.1 W/SF= 158 watts

Total = 820 + 158 = 978= 0.61 W/SF (i.e., 978 Watts / 1,611 Sq. Ft.)

EA Points= 0.5 pt.

Wattage Allowance (from Table 1)

1,611 * 0.72 W/SF = 1,160 watts (0.5 pt.)

1,661 * 0.60 W/SF = 967 watts (1.0 pt.)

1,611 * 0.48 WSF = 773 watts (1.5 pts)

Total


Conduct on‐site verification that lighting calculation matches what was installed.


Requirements (cont’d)Case 2. Multifamily Option 1. Indoor Lighting (1.5 points) • Install high‐efficacy lighting and/or lighting controls that achieve a reduction

from the ENERGY STAR baseline. • Complete the ENERGY STAR multifamily midrise worksheet for interior

lighting.

Table 3. Points for reducing interior lighting from baseline

https://www.google.com/?gws_rd=ssl#q=energy+star+multifamily+midrise+worksheet

Requirements (cont’d)Case 2: MultifamilyOR Option 2. Exterior Lighting (0.5 point)

• Complete the ENERGY STAR multifamily midrise worksheet for exterior lighting.

• Reduce exterior lighting wattage by at least 50%. • All exterior lighting must be Dark Sky qualified.


EA C14 High‐Efficiency Appliances


Intent• To reduce energy consumption through installation of efficient appliances.

Requirements Install appliances from the list below. To receive credit for one type (e.g., refrigerator), every appliance of that type must meet the requirement.

• ENERGY STAR–qualified refrigerator(s) (1 point); • ENERGY STAR–qualified ceiling fans (at least one in the living or family room

and one per bedroom) (0.5 point); • ENERGY STAR–qualified dishwasher(s) (0.5 point).

Projects outside the U.S. may use a performance equivalent to ENERGY STAR.

v2008: 2 Points

Note: Clothes Washer moved to WE C2 Indoor Water Use (1 Point)

Similar to v2008

EA C15 Renewable Energy


Intent• To encourage the installation and operation of renewable electricity generation

systems.

Requirements • Design and install a renewable electricity generation system. Receive 1 point for every 500

kWh produced per year by the system.

• The maximum allowable points for this credit is equivalent to the total points earned from all other EA credits.

• Renewable energy certificates (RECs) must be retained by the building owner

Table 1. Points for electricity generation from renewable sources

v2008 10 Points


Credit ExampleEA C15 Renewable Energy

KWh Generated Reference Annual Electricity Use

V2008 Points(1 pt. per 3%)

V4 Points(1 pt. per 0.5 KWh)

500 7,500 2 1

1,000 7,500 4 2

1,500 7,500 6 3

2,000 7,500 8 4

Assumptions (Reference Electricity Use):Heating N/A (Gas)Cooling 3,500DHW N/A (Gas)Lighting 500Appliances 3,500Total 7,500

More Aggressive Requirements

Total

Verification Measures

Conduct on‐site verification that renewable energy system has been installed. Verify that RECs have been retained by building owner. Verify calculations related to annual electric load supplied by renewable system.

Summary of Changes from v2008

EA Prescriptive PathCredit # Credit Name Single Family

(Max. Points)Midrise

(Max. Points)

v2008 v4 v2008 v4 v2008 v4

EA 2.1 EA P1 Basic Insulation Prereq ESHv3

EA 2.2 EA C3 Enhanced Insulation 2 2

EA 3.1 EA P1 Reduced Air Leakage Prereq ESH v3

EA 3.2 EA C7 (1) Greatly Reduced 2 1

EA 3.3 AE C7 (2) Minimal Air Leakage 3 2

EA 4.1 EA P1 Good Windows Prereq ESHv3

EA 4.2 EA C9 (1) Better Windows 2 1.5

EA 4.3 EA C9 (2) Exceptional Windows 3 3

EA 5.1 EA P1 Reduced Distr’n Losses Prereq ESHv3

EA 5.2 EA C11 (1) Greatly Reduced 2 1‐2

EA 5.3 EA C11 (2) Minimal Distr’n Losses 3 3

Sub‐Total 11/38 10 /38 N/A N/A

EA Prescriptive Path (cont’d)Credit # Credit Name Single Family


(Max. Points)

v2008 v4 v2008 v4 v2008 v4

From Previous Page 11 10

EA 6.1 EA P1 Good HVAC Design & Install Prereq ESHv3

EA 6.2 EA C10 (1) High Efficiency HVAC 2 2

EA 6.3 EA C10 (2) Very High Efficiency HVAC 4 4

EA 7.1 EA C2 (1) Efficient DHW Distr’n 2 3

EA 7.2 EA C2 (3) Pipe Insulation 1 2

EA 7.3 EA C12 Efficient DHW Equipment 3 3

EA 8.1 EA P1 ENERGY STAR Lighting Prereq ESHv3

EA 8.2 EA C13 Improved Lighting 2 N/A

EA 8.3 EA C13 Advanced Lighting Package 3 2

EA 9.1 EA C14 High Efficiency Appliances 2 2

EA 9.2 WE 2 Water Efficient Clothes Washer 1 N/A

Sub‐Total 27/38 27/38 N/A N/A

EA Prescriptive Path (cont’d)Credit # Credit Name Single Family


(Max. Points)

v2008 v4 v2008 v4 v2008 v4

From Previous Page 27 27

EA 10 Renewable Energy 10 4+

EA 11.1 EA P1 Refrigerant Charge Test Prereq ESH v3

EA 11.2 N/A R‐410A / Puron 1 N/A

N/A EA P2 Energy Metering N/A Prereq

N/A EA P4 Home Size N/A Prereq

N/A EA C3 Adv. Utility Tracking N/A 2

N/A EA C4 Active Solar‐Ready Design N/A 1

N/A EA C5 HVAC Start‐Up Credential N/A 1

ID 1.4 EA C1 Bldg Orientation for Solar N/A 3

AE 1.1 EA P2 Education of Homeowner Prereq Prereq

Total 38 38 N/A N/A

Example Application of EA

Apply EA prereqs and credits to a project

Small Home (1,200 Sq. Ft. 3 bedroom) Average Home (2,800 Sq. Ft., 4 Bedroom) Large Home (5,500 Sq. Ft., 5 Bedroom)

Minimum Point Floor = 8 (LT and EA Combined)

Project ExamplePrescriptive Path

Small1,200 SF

Average2,800 SF

Large5,500 SF

Comment

EA P4 Home Size Adj. 11 0 ‐15.5

EA C1 Energy Performance N/A

EA C2 DHW Distribution 2/5 Pipe Insul’n

EA C3 Adv. Utility Tracking 0/2

EA C4 Solar Ready 0/1

EA C5 HVAC Credential 1/1 Req’ in ESHv3

Sub‐Total 14/38 3/38 ‐12.5/38

Note: Minimum Point floor is 8 pts in EA and LT combined

Project Example (cont’d)Prescriptive Path

Small1,200 SF

Average2,800 SF

Large5,500 SF

EA C1‐C5 From Previous Slide 14 3 ‐12.5

EA C6 Building Orientation 0 / 3

EA C7 Air Infiltration (3.0) 1 / 2

EA C8 Envelope Insulation (2012) 0 / 2

EA C9 Windows (0.26/0.40) 1.5/ 3

EA C10 Htg & Clg Equip’t (14/92) 2 / 4

EA C11 Htg & Clg Distr’n (< 3.0) 1 / 3

EA C12 Efficient DHW (ES) 1 / 3

EA C13 Lighting (Calc’n Req’d) 0.5 / 2

EA C14 Appliances 1.5 / 2

EA C15 Renewable Energy 0 / 4

Total (Min. Point Floor = 8) 22.5/38 11.5/38 ‐4/38

8 Pts.

Equiv. to

HERS 67

Think About it …..

Total EA Points Available: 38

Level % of Max. Goal Achieved‐ 4.0 ‐ Large Home11.5 ‐ Average Home

Certified 40% 15 pts. Silver 50% 19 pts 22.5 ‐ Small HomeGold 60% 23 pts. Platinum 80% 30.5 pts

How does Home Size Affect Overall Project Performance?

Summary / Wrap Up

Learning Objectives

Student participants will be able to:• Describe changes in v4 Rating System from

v2008.

• Identify prereqs and credits in the EA category.

• Apply EA prereqs and credits to a project.

• Fill‐out the v4 workbook

Overview of EA

New PrereqsEA P1 ENERGY STAR for Homes v 3.0EA P2 Energy Metering

Minimum Point Floor 8 points in LT and EA combined.

Moved InEA P3 Education of Occupant

Point Change None (38 pts.)

Don’t be Afraid of Change

Overall Impact: Beneficial for small homes

Next Module

What’s Next?Module 4: EA – Prescriptive Path

Module 5: EA – Performance Path

Module 6: MR Prereqs and Credits

Module 7: EQ Prereqs and Credits

Module 8: IN / RP /AE / Tools /Process

Module 9: Scoring of Example Projects


(EA)

understanding leed for homes v4 - greenhome institute• complete the thermal enclosure system rater...

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