Building simulation was once a thing of science fiction, but is now an integral part of green building design and assessment, providing more accurate energy prediction and ultimately a more efficient building

Core to the principals of a green building is using less energy, and is one of the main assessment categories of both LEED and Green Star rating tools. We guide projects through the process of energy modelling from concept to completion, and facilitate iterative design with the client, architect, mechanical engineer, electrical engineer, wet services, and operational team to ensure that the sustainability targets are met and that the best possible building within budget and programme constraints is achieved.

We provide performance modelling from the conceptual stages of the project, iteratively feeding back into the design to optimise the building efficiency. This process facilitates the collaboration between the various professionals to ensure the building envelope (passive) and energy consuming  (active) systems are optimised.

We assist the professional team in critical design decisions, by empowering decision makers with a better understanding of the energy use implications.

We assess the building design for submission to the USGBC (LEED projects) and GBCSA (Green Star projects). This process is a prerequisite requirement for LEED projects as well as contributing a large portion of the attainable credits for both rating systems.






Simulation of natural light distribution. Reduce glare. Improve lighting efficiency and occupant well being.
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Annual simulation

Simulate building designs hourly for an entire year. Analyse energy use and thermal comfort.
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Cooling Design

Simulate building cooling systems in early design for system type selection, sizing, and parameter optimisation.
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Heating Design

Simulate building heating systems in early design for optimisation and with the emphasis being on passive solutions.
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What is ASHRAE 90.1? – the American Society of Heating, Refrigerating, and Air-Conditioning Engineers (ASHRAE) are the largest HVAC organisation in the world. Founded in 1894 they have produced engineering standards for over a century. LEED rating systems adopt the ASHRAE standards, and standard 90.1 relates to the energy performance of a building.

What is ASHRAE 62.1? – Standard 62.1 sets ventilation limits for acceptable indoor air quality, and is an integral part of the LEED rating systems.

What is ASHRAE 55? – Standard 55 relates to what conditions affect the thermal comfort of building occupants, and is an integral part of the LEED rating systems.

What is an energy modelling baseline? – a baseline is a theoretical building to compare a proposed project to. It allows for the quantification of building performance, and is defined by a number of guidelines depending on which certification type the project is aiming for. In both ASHRAE and SANS it denotes the minimum performing building of the same geometry, and projects are only awarded when their efficiency exceeds this.