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Simulate the interactions of building systems and how they affect overall energy performance with the goal to optimize the energy balance, and reduce energy needs for cooling and heating.

Some of the energy modeling software programs most commonly used by architects include Sketch-up for shading studies, IES Virtual Environment, and Ecotect and Weather Tool by Autodesk, which generate data for analysis as text and graphic files. These programs provide a means to comparatively rank conceptual design schemes in terms of energy use early in a project. This analysis allows for interpretive adjustments and corrections. EnergyPlus is a common program used by engineers, and allows for a much more precise and detailed analysis.

Google SketchUp offers a 3D modeling interface and the ability to assign characteristics to objects in the design. Autodesk products are Ecotect (hours or days of modeling time for output), Weather Tool (5 minutes for international wind, temperature and climate graphs and passive strategies breakdown) and Solar Tool. EnergyPlus by the Department of Energy (DOE) is widely regarded as a more powerful and flexible simulation engine. Consult your Callison Energy Modeling Team for design energy modeling studies including facade solar gain analysis, retail skylight optimization to minimize heat gain, and daylight studies to reduce electrical lighting demand.

The value of energy modeling tools is their ability to analyze and quantify highly complex interactions between systems, which ultimately results in lower energy use and costs for a building owner and/or tenant.

Early use of energy modeling provides insights that can contribute to more effective design decisions with respect to energy reduction measures and cost.

Industry drivers are energy codes and energy incentives by legislation and/or industry.

5.1.3 Daylight Modeling