Building and occupancy data
Geometry, materials, equipment, occupant density and occupancy scenarios.
Building performance modelling
Building Energy Modelling
We compare façade, lighting and mechanical system options through energy simulation for design teams and LEED consultants. We report the results in line with your project’s design or certification objectives.
From AECO references Project 2001 IGGM ↗
ENERGY · Service approach
A scope of work aligned with your project’s targets.
Dynamic simulation
Assessing energy consumption and building performance using local climate conditions.
Decision support
Comparing design options, operational and renovation scenarios.
We move forward together
Work process
The scope and stages of the work are determined according to your project's conditions.
Data collection
Defining architectural and mechanical data and operating conditions.
Model development
Integrating the building envelope, systems and occupancy scenarios into the model.
Simulation
Calculating consumption and system behaviour using climate data.
Results and comparison
We compare the design options and report the assumptions used, energy consumption and cost results.
Detailed information
About the service
Comparing system choices through energy results
How a façade option changes heating and cooling demand, or how different lighting controls affect consumption, can be assessed during design. Building energy modelling addresses these questions through calculations based on building and system information. AECO compares the effects of alternatives to help clients and design teams ground their choices in technical results.
The service supports new-building design and the assessment of operational or renovation options for existing buildings. We also provide energy modelling as a separate service where another firm leads LEED consultancy. The purpose is agreed with the relevant consultant and project team; reporting and responsibilities for review responses are defined at the outset.
Defining the building and its use together
Geometry, orientation, envelope and material properties are prepared alongside lighting, occupant and equipment loads. Heating, cooling, ventilation and control information are connected with the building's operating schedule. A weather file is selected to represent the location and analytical purpose. Interactions between these inputs inform the meaning of the results.
AECO uses the EnergyPlus engine for energy modelling. Analyses allow energy use to be examined over time and by end use. The team can assess differences in heating, cooling, lighting and other uses alongside the total result. Input sources and calculation assumptions are explained together with the findings.
Comparing the baseline and proposed design appropriately
For certification or standards assessments, the relevant method establishes comparison conditions. The baseline and proposed design are assessed within the same framework. Energy consumption, energy cost and emissions are different metrics; the report clearly identifies which result is being compared.
The Performance Rating Method in ASHRAE 90.1 Appendix G is one method used to compare energy performance. Where it applies, the baseline building and proposed design follow the rules of the relevant edition. The standard and edition are selected through the target assessment pathway.
Translating analysis into design decisions
We explain how each design change relates to differences in the relevant end uses. Envelope, glazing, shading, lighting and mechanical system decisions can be examined together. The design team can consider the options alongside implementation and operational needs as well as calculation results.
Deliverables include input and assumption records, comparative results, graphics and technical assessments within the agreed scope. Calculated performance represents the conditions used. If results are to be compared with actual consumption, measurement records and operational conditions are also reviewed.
Related work
For assessing options together during early design, see our optimisation service; for the relationship between light and the façade, see our daylight and solar radiation service. Our energy modelling article explains the role of the work in the design process.
For your questions
Frequently asked questions
Which design decisions can building energy modelling support?
Energy modelling calculates building energy use to help compare façade, glazing, lighting and mechanical system options. The results show how each option affects consumption and operating costs. Investment decisions can then be supported by technical comparisons based on clearly defined assumptions.
How are the baseline building and proposed design compared?
The baseline is defined using the assessment method appropriate to the study, while the proposed design represents the project's characteristics. Weather, use and calculation conditions follow that method's comparison rules. Energy consumption, energy costs and emissions are reported as distinct measures.
Will the savings calculated in a simulation appear at the same rate on utility bills?
Calculated savings compare two scenarios under defined assumptions. Actual consumption can vary with weather, operating hours, occupancy and how systems are run. For buildings in operation, comparisons with measured data can help assess how the model relates to actual operating conditions.
What project information is needed for energy modelling?
Key inputs include architectural geometry, envelope and glazing properties, mechanical systems, lighting power and operating schedules. The level of detail depends on the study's purpose and project stage. Assumptions for information not yet confirmed are documented and considered when interpreting the results.
Can you provide energy modelling for a project with another LEED consultant?
Yes. We also provide energy modelling for projects whose LEED consultancy is led by another firm. The calculation method, required inputs, reports and responsibilities for review responses are agreed at the outset. Our proposal defines model file deliverables and coordination between the teams.
What does simple box analysis offer during early design?
Simple box analysis uses simplified building geometry to compare the energy effects of design options. Decisions on orientation, glazing ratio, shading and the building envelope can be explored before detailed design is fixed. These comparisons help establish priorities for further design and modelling.
What affects the timescale and cost of energy modelling?
Building complexity, data readiness, the options to be compared, revisions and reporting requirements affect both timing and fees. We review your project information and define the study scope, deliverables and programme in our proposal. For certification studies, the scope of support for review responses is also specified.
Project analyses
Examples from practice
Projects
Building Performance Modelling Projects
Abbreviations
- ASHRAE
- American Society of Heating, Refrigerating and Air-Conditioning Engineers — publishes standards on heating, cooling, ventilation and building energy performance.