Delivering an Energy Model for BREEAM and LEED – Exposing What Really Matters (CIBSE ASHRAE...

Delivering an Energy Model for BREEAM and LEED – Exposing What Really Matters

John Gleeson B.Sc. Eng., C.Eng. MIEI,

IES Ltd. (Dublin) John.Gleeson@iesve.com

Liam Buckley ASHRAE Member, M.Eng., C.Eng. MIEI, BEMP

IES Ltd. (Boston) Liam.Buckley@iesve.com

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 John.Gleeson@iesve.com

Questions / Comments

Liam Buckley ASHRAE Member, M.Eng., C.Eng. MIEI, BEMP

IES Ltd. (Boston) +1 617 840 6101 Liam.Buckley@iesve.com