Simulation Driven Green Building Design - caeai.com · PDF fileSimulation Driven Green...
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Simulation Driven Green Building Design
© 2009 ANSYS, Inc. All rights reserved. 1 ANSYS, Inc. Proprietary© 2009 ANSYS, Inc. All rights reserved. 1 ANSYS, Inc. Proprietary
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Simulation for Green Technology
• Green Technology is composed of several key thrusts
– Pollution Reduction
– Renewable Energy & Fuels
– Energy Efficiency
– Indoor Air Quality
© 2009 ANSYS, Inc. All rights reserved. 2 ANSYS, Inc. Proprietary
– Indoor Air Quality
– Green Building Design
• ANSYS simulation tools are used in all of the above areas
• Application of ANSYS simulation tools (related to Airflow Modeling) in Green Building Design is briefly highlighted here
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What is Airflow Modeling
• Numerical approach to solve the complex governing equations of airflowcontinuity / momentum / energy / contaminant transport
• Requires a computer model of the space -> mesh– not all features of the geometry are relevant to airflow
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• Requires specification of boundary conditionsflows / heat sources / contaminant sources / wall BCs
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Airflow Modeling & Contaminant
Transport in Ramsis VII Tomb
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Courtesy of: Cairo University, Egypt
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How Airflow Modeling helps Engineers with
Green Building Design
– Help optimize energy performance (1-19 LEED points)
– Design on-site renewable energy (1-7 LEED points)
– Design to control indoor chemical and pollutant sources (1 LEED
• Engineers benchmark designs using the LEED Green Building Rating System
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– Design to control indoor chemical and pollutant sources (1 LEED point)
– Design to comply with ASHRAE Standard 55-2004, for thermal comfort (1 LEED point)
– Design HVAC system (mechanical or naturally ventilated) to provide minimum IAQ performance complying with ASHRAE 62.1-2007 (Required – No LEED points)
– Design for ETS control (Required – No LEED points)
• Airflow modeling assists in the process of developing and evaluating design concepts as well as contributes to the evidence that a proposed design meets various rating criteria
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Innovation for Demanding Applications
• Design objective was to create
William Jefferson Clinton Museum
Little Rock, Arkansas
Courtesy of Flack & Kurtz
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• Design objective was to create stratified layer of air with conditions in human comfort zone
• Large cooling load due to solar radiation, specialty lighting, and interactive display equipment
• Design included radiant floor, underfloor air distribution, and jet supply diffusers with various supply temperatures
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Use Airflow Modeling to Support
LEED Certification Process
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• Simulations were performed to study the interaction of the various systems
• To determine the optimum operating conditions for the air flow systems during regular occupancy
• to verify the ventilation effectiveness in support of a LEED™ credit
Supply Airflow PathlinesWilliam Jefferson Clinton Museum
Little Rock, ArkansasCourtesy of Flack & Kurtz
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Use Airflow Modeling to Support
LEED Certification Process
“We have used ANSYS software for quite a few years, but just within the past two years we have
Great River Energy Corporate HQMaple Grove, Minnesota
Courtesy of Dunham Associates
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John Costello, LEED AP
Dunham Associates
years, but just within the past two years we have been using it more often for many different projects. Simulation results assist us in the process of developing and evaluating design concepts as well as contribute to the evidence that a proposed design meets various rating criteria. Moreover, we use the software to produce visualizations for marketing purposes to enhance our communication with prospective clients. I don't see our use of this tool letting up any time soon.”
Colored contours of Thermal Comfort in a conference room predicted for a particular ventilation system design
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Atrium Design for Energy Efficiency
& Comfort
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Courtesy of:Architectural Energy CorporationEnergy and Sustainable Design ConsultantsBoulder, CO
National Museum for the Marine CorpsQuantico, Virginia
Temperature contours
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Natural Ventilation
& Solar Radiation
Proposed Expansion of
Phipps Conservatory and Botanical Gardens
Pittsburgh, Pennsylvania
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Simulation of naturally ventilated tropical rain forest building showing
• airflow pathlines
• air temperature
• solar shading
Courtesy of:IKM Incorporated ArchitectsPittsburgh, PA
Architectural Energy CorporationEnergy and Sustainable Design ConsultantsBoulder, CO
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Airflow Simulation in Design
of Green Buildings
• Award winning entry in U.S. Green Building Council (USGBC) Design Competition modeled using CFD software from Ansys
• Entries required to meet
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• Entries required to meet requirements for LEED Platinum Rating plus target budget of <$100 per square foot.
• Natural ventilation design performance assessed through airflow simulation
Proposed Addition to facility for the Pittsburgh Project
Courtesy of OWPP
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CFD Assessment of
Natural Ventilation Design
• Simulation allows exploration of energy efficiency concepts that might otherwise be deemed unrealizable
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• Velocity Vectors and Temperature Contours in Proposed Design
unrealizable
Courtesy of OWPP
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Allianz Stadium in Munich
• Specially built for the World Cup
• Holds 70,000 spectators and the largest car park in Europe (10,000 cars) underneath it
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• Simulation was used by VTD GmbH to design the stadium with respect to– Airflow requirements over the
stadium– Thermal comfort for the crowd– Airflow over the turf for optimal
grass growing conditions– Fire/smoke management– Parking garage ventilation
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Allianz Stadium
Simulated Airflow Patterns
External
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Internal
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• Occupant thermal comfort and indoor air quality• Predicting room conditions:
– Air velocity, temperature– Relative humidity, thermal radiation– Toxins
• Assessment of a variety of comfort criteria– Combined with information about occupant activity and clothing
• Impact of heat loss through the structure, including solar gain effects
Thermal Comfort and Ventilation
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• Impact of heat loss through the structure, including solar gain effects• Testing effectiveness of novel strategies and concepts:
– Natural and mixed ventilation– Minimizing energy consumption
Courtesy of Olof Granlund Oy
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Hodynka Arena in Moscow
Courtesy of
Home of the 2007 IIHF World
Championships
Supply jetsDisplacement Diffuser
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• Simulation was used to– Determine the best HVAC systems– Thermal comfort for the crowd– Fire/smoke management
• Facility employs combined displacement ventilation and mixing airflow from supply jets
• Facility has multiple uses
Temperature during Summer Hockey Game
Air Velocity for Mixing Airflow from Roof Zone
Temperature during Summer Concert
Diffuser
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Yoyogi National Stadium in Japan
• Multi-use stadium– Swimming competitions– Concerts
• Different ventilation strategies– Active/inactive supply
diffusers– Different airflow patterns –
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Yoyogi National Stadium with its double-crescent roof design
– Different airflow patterns – Still able to provide
temperature uniformity
Computational mesh
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particle traces colored by temperature
Airflow & Thermal Comfort
in a Theater
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Courtesy of McCracken & Lopez, P.A.
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Airflow & Thermal Comfort in
the Budapest Opera House
• Built in 1884 and original ventilation was via natural ventilation through vents under seating area
• Renovated several times over the years with
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over the years with mechanical ventilation and air conditioning systems introduced
• Separate ventilation system for the stage area
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• Used airflow modeling as part of an HVAC assessment of the building
• CFD results showed
• Poor ventilation in the
Airflow & Thermal Comfort in
the Budapest Opera House
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Pathlines colored by temperature show differences of 5oC or less between seating area
and orchestra pit
• Poor ventilation in the orchestra pit
• Thermal anomalies in the balcony
• Airflow study being used in the reconstruction and modernization of the Opera House ventilation system
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Welsh Assembly (BDSP)
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• Aim:– Optimize ventilation configuration
with regard to thermal comfort and energy consumption
• Results shown here: Fan-assisted buoyancy-driven ventilation
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Swiss Re Building - London
• Simulations assessed the buildings fluid and thermal performance– Displacement ventilation– Chilled floors– The cooling dome–
First Sustainable Design Building in London
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– The cooling dome– Solar heating– Pedestrian and worker comfort
Simulated airflow on one floor with windows open
CAD model of several floors
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Greenwich Millennium DomeGreenwich Millennium Dome
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• CFD done by CFX , began in 1998, commissioned by NMEC & Buro Happold
• Ventilation + fire• Wind boundary conditions at dome
roof provided by Buro Happold
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Floor Temperature & Thermal Stratification in
a Conference Room with Displacement
Ventilation
� 250 cfm per diffuser� 64 oF supply temp
� 150 cfm per diffuser� 56 oF supply temp
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• Project showed ability of the ventilation system to circulate fresh air throughout the facility
Parking Garage Ventilation
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• Ventilation system for an enclosed 5-level parking garage– Fresh air through openings– Axial circulating fans on each
level– Centrifugal exhaust fans on
each level
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Wind Engineering
• Response of the building to its environment as well as the response of the environment to the building
• Understand the aerodynamics of a structure and the resulting pressure map on its surface
• Analysis of the behavior and stability of the construction under various weather conditions
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construction under various weather conditions
• Impact on pedestrian comfort and safety
• In urban and non-urban settings, address: – Environmental and safety issues– Dispersion of gases and aerosols
Some pictures courtesy of Building Design Partnership Ltd
Dispersion of exhaust discharge and its impact on the surrounding
buildings to ensure the design proposal met current regulations
and standards
Pressure map on a building with flow pathlines around it
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BullRing Shopping & Leisure Complex
- Birmingham, England
•
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• Simulations assessed performance of proposed plant arrangement
• Identified if exhaust air was re-circulated to fresh air intakes
• Aided finding the appropriate solution for plant and intake positioning
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Bishopsgate Tower - London
Pressures on the surfaces of Bishopsgate Tower and some surrounding buildings
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• External wind simulation • Computed building surface pressure
distribution used for wind loading analyses
Courtesy of Hilson Moran, London, UK
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CFD Modelling of Regional Flow
Patterns near Cape Shopping Centre
Surface Mesh
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Courtesy of:Stephan Schmitt & Thomas Kingsley
Qfinsoft, SA
Surface PressuresSurface Pressures
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temperature contours
ANSYS Simulation Software Products are
Effective Green Building Design Tools
• Better understand alternatives to mixing ventilation• Streamline diffuser placement• Optimize supply flow rates and supply temperatures• Investigate design performance ahead of time
• Save time and money by quickly and accurately exploring alternate designs
• Demonstrate to clients how different ventilation strategies work
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air velocity vectors
contours
Naturally Ventilated Shopping GalleriaCourtesy of Mechanical Design Associates