Conceptual Building Performance Analysis Overview Introduction · Revit Conceptual Energy Analysis Applicable to Autodesk® Revit® Architecture and Autodesk® Revit® MEP with Subscription

Building Information Modelling for Sustainable Design Conceptual Building Performance Analysis Overview

©2011 Autodesk. All rights reserved.

Introduction

In this whitepaper we will explore some of the Building Information Modelling technologies available for making informed

sustainable design decisions from the earliest possible design stages.

How does Building Information Modelling aid Sustainable Design?

Building Information Modelling (BIM) is core to Autodesk’s sustainable design approach. BIM is an integrated workflow built on

coordinated, reliable information about a project from design through construction and into operations.

Autodesk BIM software makes sustainable design practices easier, more efficient, and less costly by enabling architects,

engineers, builders, and owners to:

• Easily create coordinated, digital design information and documentation

• Use that information to accurately visualise, simulate and analyse project performance, appearance, and cost

• Reliably deliver the project faster, more economically, and with reduced environmental impact through the project

lifecycle from design through operation

With BIM, the information required for sustainable design, analysis, code compliance, and certification becomes available as a

by-product of the standard design process, making the sustainable design process inherently more efficient and cost-effective.

Further, analytical capabilities not possible in traditional, drawing-based methods are easily accessed through BIM.

Autodesk’s commitment to sustainability

Autodesk is committed to sustainability and demonstrates this through:

• Using Autodesk’s own operations as living lab opportunities to innovate in sustainable design practices.

• Providing educational programs to help the next generation of designers to incorporate sustainability.

• Striving to help every AEC professional more easily and routinely consider the sustainability implications of their design

decisions by offering a broad portfolio of products and helping get the most from them.

• Acting as an expert adviser to bodies such as the World Economic Forum’s Low Carbon Taskforce, DOE’s Net-Zero

Energy Consortia, and the U.K’s Technology Strategy Board and work on solutions with other companies through the

Green Sigma Coalition, World Resources Institute, U.S.-China Energy Cooperation Program, and various green

certification councils.

The Autodesk Corporate Sustainability Report can be viewed at: http://www.autodesk.com/sustainabilityreport



Revit Conceptual Energy Analysis Applicable to Autodesk® Revit® Architecture and Autodesk® Revit® MEP with Subscription

With the Revit Conceptual Energy Analysis tool, architects and engineers can quickly convert conceptual design models into rich

analytical energy models, and conduct integrated whole building energy analysis.

As an early design concept changes, the energy model and conceptual massing forms are updated accordingly. This makes it

possible to continuously conduct energy and carbon analysis and compare design alternatives.

Highly visual analysis reports make it easier to understand and communicate the impact of design changes to project

stakeholders.

These integrated early analyses help make more informed decisions in the conceptual design phase when changes are least

expensive. An added advantage is the conceptual model can be used to form the basis of the more advanced model as the

design develops.

Key features

Web-based Climate Data

At the heart of the Revit Conceptual Energy Analysis Tool is cloud based computing that allows rapid analysis without disturbing

user workflow. To enable the analysis, a high resolution global climate data set containing more than 1.5 million weather

stations is available to the user. The building can be located using Google Maps™ technology and an appropriate weather station

selected. The data for this weather station is then used for the energy analysis runs.



Conceptual Massing Tools

Building forms can be quickly created using the expressive conceptual design tools available. Separate forms can be created

within the mass to allow separate space types to be applied. Mass floors are applied to the resulting form as a prerequisite for

energy analysis

Automatic Form Rationalisation

Intelligent energy settings are used to define the desired performance parameters for the building and are used to rationalise

the mass form into zones and surfaces used for energy analysis. The global energy settings for the building can be overridden for

specific zones and surfaces to tune the model to suit requirements. Custom glazing and shading can be created where required.



Graphical Energy Analysis Results

With the mass form complete and the required energy settings applied, the model can be submitted to the cloud for analysis.

When complete, the user will be notified via a pop-up window and can then review the results. These results include energy

usage, lifecycle costs, and breakdowns of consumption and loads. The easy to understand graphical results and raw data can be

shared with project stakeholders via .pdf, .png image file or .csv file.

Compare Design Options

Use Revit design options and results comparison to explore and evaluate multiple concepts and design iterations.



Export mass to gbXML

Leverage the easy to use conceptual modelling tools to create energy analysis models for use in downstream analysis tools via

the gbXML file format.

Revit Solar Studies Applicable to Autodesk® Revit® Architecture, Autodesk® Revit® Structure and Autodesk® Revit® MEP

It is possible at the earliest stages of design to evaluate the impact of natural light and shadows on your design by performing

solar studies using Revit’s sun path functionality. The sun path is a visual representation of the sun's range of movement across

the sky at the geographic location you specify for a project. Using the sun path's on-screen controls, you can create solar studies

by placing the sun at any point along its daily path, and at any point along its analemma. It is also possible to animate solar

studies for a defined period.



Technology Previews

Autodesk® Project Vasari

Project Vasari is aimed at concept designers and energy analysts and acts as a test bed for new technology and as an ‘on-ramp’

to Building Information Modelling. It includes the Revit Conceptual Energy Modelling and Analysis Tools and can be downloaded

from:

http://labs.autodesk.com/utilities/vasari/

Analyses included in Project Vasari not currently found in Autodesk® Revit® products are Solar Radiation and Wind.

Autodesk® Green Building Studio®

Utilising cloud-based whole building energy analysis, Green Building Studio uses uploaded gbXML files to provide analysis of the

design to estimate energy consumption, determine carbon emissions and understand potential for renewable energy use. The

gbXML files used can be derived from the Revit Conceptual Energy Analysis mass models or more detailed building information

models containing rooms or spaces from Autodesk® Revit® Architecture or Autodesk® Revit® MEP, or compatible third party

products.

Additional assumptions and parameters can be applied to the analysis runs over that possible in the Revit Conceptual Energy

Analysis tools. In addition, if the gbXML is derived from an Autodesk® Revit® MEP model, specified space types, interior loads,

constructions and HVAC equipment data will be used for the analysis.

Key features

Energy and Carbon Results

Results from the analysis are displayed in a comprehensive yet easy-to-understand summary page. The results provide accurate

information on building energy and resource use, carbon emissions, simulation assumptions, performance metrics, and costs.

These results can be used to compare the energy costs of multiple building design scenarios.



Design Alternatives

Use drop down menus to adjust parameters that will impact the energy and carbon analysis. This permits fast optioneering to

explore aspects critical to the design, such as HVAC systems, lighting performance or construction materials.



Portfolio Dashboards

Portfolio Dashboards facilitate the display of analysis results across a range of buildings. This allows building owners to quickly

identify how buildings are performing across their portfolio. You can organise your projects in different dashboards by location,

building type, climate, and other categories. Dashboards can compare Energy Use Intensity, Annual Energy Cost, Annual Energy

Consumption and Average Energy versus Degree Days.

Autodesk® Simulation CFD Applicable to Autodesk® Revit® Architecture and Autodesk® Revit® MEP

Autodesk Simulation CFD allows you to conduct real world testing on your models to understand how design changes can help

you achieve environmental objectives and energy certifications.

Factors such as aesthetic appeal, occupant comfort, indoor air quality, and safety needs are considered for both the present and

the future. Simulation CFD informs energy-efficient design and takes advantage of natural resources to significantly improve

sustainable development



Key features

Real-World Validation

Autodesk Simulation CFD provides airflow and thermal validation directly from the Building Information Model. Architects and

engineers are able to understand how design changes can help achieve environmental objectives.

Direct Comparison

Performance of a new technology or design approach can be studied for effectiveness early in the development stage before

significant time, investment or design resources are committed. For example: natural ventilation vs. mechanical ventilation

studies, impact of solar shading Etc.

Architects and engineers are able to demonstrate how a design approach will achieve energy efficiency standards, energy

certifications or air quality requirements before construction.

Simulation CFD offers tools for maximising efficiency of a given design approach, such as varying the thickness of the air layer in

a ventilated façade.

Engineers have access to tools for making fast, accurate comparisons of thermal comfort and air quality issues for different types

of HVAC and structural designs.



Autodesk Sustainable Design Resources

For further reading, please see the following web resources:

Sustainable Design Centre: www.autodesk.com/sustainabledesign

Sustainable Design Guide for AEC: www.autodesk.com/sustainabledesignguide

Sustainable Design Workshops: http://sustainabilityworkshop.autodesk.com/

Documents

Conceptual Building Performance Analysis Overview Introduction · Revit Conceptual Energy Analysis Applicable to Autodesk® Revit® Architecture and Autodesk® Revit® MEP with Subscription