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This presentation looks at the technical perspectives of delivering an energy model for both the purposes of different regulatory frameworks; LEED and BREEAM. The technical focus will be upon the metrics used and design strategies that affect the performance, certification and rating of buildings.
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Delivering an Energy Model for BREEAM and LEED – Exposing What Really Matters
John Gleeson B.Sc. Eng., C.Eng. MIEI,
IES Ltd. (Dublin) [email protected]
Liam Buckley ASHRAE Member, M.Eng., C.Eng. MIEI, BEMP
IES Ltd. (Boston) [email protected]
Delivering an Energy Model for BREEAM and LEED – Exposing What Really Matters
The Energy Model
• Efficiencies & Inefficiencies • Equivalencies & Synergies
• Opportunities
Delivering an Energy Model for BREEAM and LEED – Exposing What Really Matters
Delivering an Energy Model for LEED 1. The Model Geometry
Delivering an Energy Model for LEED 1. The Model Geometry
Proposed Model 4 Baseline Models
• 40% glazing maximum • No Shading • Fixed Envelope U-values • Fixed Lighting (W/m2) • Fixed HVAC based on heating fuel source,
number of floors and conditioned floor area of building
• No Renewable Energy
• As designed (almost)
Delivering an Energy Model for LEED 1. The Model Geometry
Solar Tracking & Shading Detailed Solar Tracking for Solar Gain Calculations Linked to HVAC Loads Sizing & Energy Simulation
Delivering an Energy Model for LEED 1. The Model Geometry
Abu Dhabi Financial Centre, UAE • 6,100,000 square foot development, 8 buildings • Double-Skin Façades • Daylight Harvesting • Automated Shades & Blinds • Underfloor Air Distribution • CDQ Desiccant Dehumidification • PV Panels
Delivering an Energy Model for BREEAM 1. The Model Geometry
Delivering an Energy Model for LEED 2. The Climate / Weather Data
• Dry-bulb temperature • Wet-bulb temperature • External Dew-Point Temperature • Wind Speed • Wind Direction • Direct Radiation • Diffuse Radiation • Global Radiation • Solar Altitude • Cloud Cover • Atmospheric Pressure • External Relative Humidity • External Moisture Content
Weather Data (8,760)
Delivering an Energy Model for LEED 2. The Climate / Weather Data
Q: What Weather Data do you use? • TMY, TMY2, TMY3, IWEC, CWEC, TRY, DSY, TMY (7), TMY (15), AMY?
1960 1970 1980 1990 2000 2010 2020 2030 2040 2050 2060 2070 2080
TMY2 Building Lifecycle if built today
1965 1970 1975 1980 1985 1990 1995 2000 2005 2010 2015 2020
TMY2 [1961-1990]
TMY (7)
TMY (15)
2014 TMY3 [‘91-’05]
IWEC [1982-1999]
Dublin89
IWEC
TMY(15)
TMY(7)
Delivering an Energy Model for LEED 2. The Climate / Weather Data
Dublin Weather Heat Maps JAN FEB MAY APR MAY JUN JUL AUG SEP OCT NOV DEC
Delivering an Energy Model for LEED 2. The Climate / Weather Data
Dublin Temperature Distribution
IWEC TMY(7)
Δ = 1,537 hours < 8°C
Delivering an Energy Model for BREEAM 2. The Climate / Weather Data
• Ireland – • Monthly weather data from with SBEM • Dynamic thermal simulation average IWEC
file used (8760hrs)
• UK • Monthly weather data from with SBEM • Dynamic thermal simulation average TRY
file used (8760hrs)
Delivering an Energy Model for LEED 3. The Building Envelope
Envelope Analysis; Fabric & Infiltration:
Delivering an Energy Model for BREEAM 3. The Building Envelope
• U-Values • Thermal Bridging • Infiltration
• Refurbishment – Oct 2014
Delivering an Energy Model for LEED 4. Internal Gains
0
0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
1.8
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23
Ligh
tin
g En
erg
y (M
BH
)
Time (Hrs)
Delivering an Energy Model for LEED 4. Internal Gains
Typical Daily Usage of Lighting Energy
Delivering an Energy Model for BREEAM 4. Internal Gains
• National Calculation Methodology
Delivering an Energy Model for LEED 5. HVAC Systems
HVAC Baseline System Selection • Based on heating fuel source, number of floors and conditioned floor area of building
Delivering an Energy Model for LEED 5. HVAC Systems
Part-Load Performance Curves
Delivering an Energy Model for LEED 5. HVAC Systems
Naturally Ventilate…. Or not?
Delivering an Energy Model for BREEAM 5. HVAC Systems
Delivering an Energy Model for LEED 6. Other End-Uses
Elevators, DHW, Exterior Lighting, etc.
Delivering an Energy Model for BREEAM 6. Other End-Uses
Dependant on building type
Delivering an Energy Model for LEED 7. The Simulation Metrics
Cost of Energy Consumption, Unmet load hours, etc.
Delivering an Energy Model for LEED 7. The Simulation Metrics
Walgreens Net-Zero Store
• PV Roof • Daylight Harvesting • Automated Shades • Geothermal • CO2 refrigeration • Energy recovery
Courtesy: Cyclone Energy Group
Delivering an Energy Model for BREEAM 7. The Simulation Metrics
EN01 Energy Efficiency • Notional building comparison • Translation into the ratio • Weighting
Building energy comparison BREEAM vs LEED
Delivering an Energy Model for LEED Summary
Detailed & Robust - Better Accuracy.
Updated/improved every 3 years.
Influential factors can be identified early.
- Favours Airside HVAC Systems. - Assumes sealed, fully conditioned buildings. - Documentation.
• Efficiencies are Improving • Baseline HVAC Becoming Regional • More Simulations (DL) Required
Delivering an Energy Model for BREEAM Summary
Key Objectives • Provide consistency and comparability • Comparison against national baseline • Use of national best practice standards • Adds value
Delivering an Energy Model for BREEAM Summary
BREEAM EQUIVALENCY FOR LEED
A Presentation by: Integrated Environmental Solutions
To find out more, please contact: John Gleeson B.Sc. Eng., C.Eng. MIEI,
IES Ltd. (Dublin) +353 1 8750104 [email protected]
Questions / Comments
Liam Buckley ASHRAE Member, M.Eng., C.Eng. MIEI, BEMP
IES Ltd. (Boston) +1 617 840 6101 [email protected]
