Many have become familiar with energy modeling as it can validate local code compliance and it can be a useful tool in the LEED certification process. Often alternatively referred to as Whole Building Energy Simulation, it is frequently utilized to achieve the prerequisite and/or to gain additional points in the Energy & Atmosphere credit category. The building must show it has a 10% improvement above the ASHRAE 90.1-2007. Additional percentages in 2% increments above that will garner extra points. LEED certification is a great reason to develop an energy model, yet it should not constitute the only rational for pursing one.
The energy model can be an integral part of the design process from conceptual design through construction documentation. When creating the model, a series of inputs will assist in best determining the energy outputs. Input examples include:
Location - climate data
Envelope - Infiltration rates
Internal Gains - plug loads in watts/s/f
Schedule - lighting schedule
Systems - fan and pump inputs, renewable energy systems
Conversely, it is also important to note that the results of the model can only predict how the building will perform, and cannot say in absolute certainty what the final energy consumption will be. When the building is running in real time, variables will certainly be present like a spike or dip in seasonal temperatures or employee working hours that don't reflect what the model accounted for.
It is without question that the energy model is a great tool to use in the design or retrofit of a building. Despite the in-depth the knowledge of the team members, it is incredibly valuable to analyze how all the components in the building design will come together and work with the local environmental factors. The whole building energy simulation assists the design team and owners in creating and operating the most efficient building possible within their project goals.
Zoe Reich, LEED AP BD+C, is the director of sustainability at Edwards & Zuck, P.C., New York, N.Y.
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