Daylighting
After mastering the basics of energy modeling with OpenStudio and EnergyPlus, there are still many advanced modeling features left to explore. A few include: Radiant heating and cooling systems that can achieve deeper savings for some climates and buildin
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Daylighting
8.1 Introduction After mastering the basics of energy modeling with OpenStudio and EnergyPlus, there are still many advanced modeling features left to explore. A few include: • Radiant heating and cooling systems that can achieve deeper savings for some climates and building types, • Distributed energy resources and storage systems may be added to design net zero or off grid buildings,1 • Large refrigeration for grocery store and warehouse models, • Airflow network models may be added for improved infiltration and natural ventilation assessment, and • EnergyPlus’ EMS scripting language which allows users to model custom building controls and sequences of operation. These features and many more, integrated within EnergyPlus are beyond the scope of this introductory text. However, the approaches we have discussed for comparative analysis of building design features is equally applicable when considering these advanced topics. The EnergyPlus Input Output Reference is the definitive reference for learning more about EnergyPlus’ full range of capabilities. In addition, OpenStudio can facilitate interoperability and co-simulation with other engines and solvers that are designed to model specific building or grid-related phenomena in greater detail. One such program, and the subject of this Chapter, is Radiance.2 While EnergyPlus can model daylighting and calculate associated energy savings, that isn’t its primary function and the algorithms it uses to do so are simplified. Radiance has been purpose-built to model light propagation in buildings 1 Distributed energy resources include solar hot water, photovoltaic, and wind turbine, and generator systems. A few examples of thermal and electric storage include phase change construction materials and mechanical systems or batteries. 2 Ward and Shakespeare (1998).
© Springer International Publishing AG, part of Springer Nature 2018 L. Brackney et al., Building Energy Modeling with OpenStudio, https://doi.org/10.1007/978-3-319-77809-9_8
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8 Daylighting
and is capable of calculating lighting metrics with far greater accuracy. OpenStudio pairs EnergyPlus with Radiance to deliver superior energy savings estimates for lighting-related ECMs.
8.2 Daylighting Daylighting is a key design strategy used in low energy buildings, particularly offices, which tend to have high lighting loads and daytime occupancy. By making use of naturally available light entering the building through windows, skylights, and other apertures; electric lights may be dimmed or turned off when they are not needed. This strategy provides direct lighting energy savings. In addition, reducing lighting heat rejection can lower cooling loads for further HVAC energy savings. Beyond the energy benefits, many studies3,4 have found that daylit spaces are more comfortable, pleasant, and healthy for occupants. Creating a well daylit space requires careful design, far beyond the energy performance tradeoff of adding fenestration to provide daylight access while potentially reducing the envel
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