Tag Archives: passive cooling

Visualizing Weather Data Using Climate Consultant

Green Building

Visualizing Weather Data Using Climate Consultant

Originally published on December 28, 2015 by BNP Media through the Architectural Roofing & Waterproofing Blog. The U.S. Department of Energy’s Office of Energy Efficiency & Renewable Energy (EERE) provides public access to long-term climate data for over 2,100 locations throughout the world in formats suitable for the publicly-funded EnergyPlus whole-building energy modeling software. These files are chock-full of hourly weather data of 30-year averages for temperature, humidity, wind speeds, and much more. For residential projects and other skin-load dominated….

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The Difference Between Reflectance and Emittance

Green Building

The Difference Between Reflectance and Emittance

Originally published on November 18, 2015 by BNP Media through the Architectural Roofing & Waterproofing Blog. What is emittance? Among the three basic forms of heat transfer – conduction, convection, and radiation – the term emittance refers to a material’s ability to release heat through radiation. The term necessarily refers to the heat exchange at surface of a material because heat exchange through a solid would be conductive and heat exchange through a fluid would be convective. Emittance is the….

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When the ‘Prevailing’ Wind Direction is Anything But

Green Building

When the ‘Prevailing’ Wind Direction is Anything But

Originally published on June 1, 2015 by BNP Media through the Walls & Ceilings Blog. The wind rose is a conventional diagram for characterizing both the direction and frequency of wind around a project site. This graphic is commonly included in a climate data analysis. Some software platforms such as Climate Consultant, one of several free energy analysis tools developed and released through the University of California, Los Angeles (UCLA) Department of Architecture & Urban Design, can generate wind roses….

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Water: The Ideal Thermal Mass? (EDC Magazine Edition)

Green Building

Water: The Ideal Thermal Mass? (EDC Magazine Edition)

A classic example of a roofpond application, the Atascadero House (Atascadero, Calif.) was designed with the assistance of Harold R. Hay and built in 1973. Photo credit: John Reynolds. Thermal mass is an essential component for any passive solar heating or cooling strategy. It’s useful because it absorbs solar energy and provides inertia against interior temperature fluctuations despite diurnal temperature cycles. Design teams can introduce thermal mass into projects in a number of ways. Baked clay, adobe and various types….

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The Invention of the Roofpond System

Green Building

The Invention of the Roofpond System

The roofpond system has always been a dark horse of sorts in the realm of passive solar heating and cooling. Most literature on passive systems will pay lip service to roofponds, but few give credence to the system’s immense potential as exemplified by various case studies with well-documented performance. The reason that the roofpond is often overlooked is two-fold. First, the system has always had a difficult time  “fitting in” with any one category of environmental control systems. It can be used….

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