All posts by Daniel Overbey

The Psychrometric Chart Explained

Green Building

The Psychrometric Chart Explained

Originally published on June 13, 2018 by BNP Media through the Building Enclosure Blog. It is one of the intimidating charts for any building design professional: the psychrometric chart. At first blush, the “psych chart” looks very complicated. There are layers of axes and curved reference lines. However, a closer examination will reveal that – at its essence – the chart is visually conveying the answers to two related questions: How much sensible (dry-bulb) heat is in the air? (See….

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Dry-Bulb Temperature, Wet-Bulb Temperature and Enthalpy

Green Building

Dry-Bulb Temperature, Wet-Bulb Temperature and Enthalpy

Originally published on May 9, 2018 by BNP Media through the Building Enclosure Blog. There is energy in the air all around us. Some of it exists in the form of thermal energy that one can sense – heat in air that impacts one’s perception of thermal comfort. But there is also an energy embodied in the vapor present in the air. While this “hidden” heat is not experienced as warmth, it certainly has a bearing on thermal comfort as….

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Defining Humidity Ratio and Relative Humidity

Green Building

Defining Humidity Ratio and Relative Humidity

Originally published on April 4, 2018 by BNP Media through the Building Enclosure Blog. How does a hot-air balloon rise? Fire up the burner and the temperature of the air captured within the balloon increased. The molecules of the air take on the thermal energy and become more excited. The excited molecules create more space between them. As a result, the air expands as its temperature increases. Thus, one pound of air at 80-degrees Fahrenheit (°F) is a larger volume than….

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Thermal Dynamics: Visualizing Sensible Versus Latent Heat

Green Building

Thermal Dynamics: Visualizing Sensible Versus Latent Heat

Originally published on March 12, 2018 by BNP Media through the Building Enclosure Blog. It’s the first law of thermodynamics. The Law of Conservation of Energy states that energy can neither be created nor destroyed; energy can only be transferred or changed from one form to another. This is the foundation of phase change in the physical environment. Molecular activity requires energy. The activity does not just magically happen. Phase Change When a material changes its state or phase (e.g., going….

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Five Diagrams Every Design Team Should Know

Green Building

Five Diagrams Every Design Team Should Know

Originally published on February 7, 2018 by BNP Media through the Building Enclosure Blog. They might be considered cliché; however, they might also be very true. The following are five diagrams that frequently work their way into slide decks about green building design and construction. You should be familiar with all of these. Let’s unpack each one briefly – going back to primary source material and acknowledging attribution. Read more…

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Tracking Energy Efficiency Improvements in ASHRAE Standard 90.1

Green Building

Tracking Energy Efficiency Improvements in ASHRAE Standard 90.1

Originally published on January 17, 2018 by BNP Media through the Building Enclosure Blog. It may be the most well-known standard in the building design and construction industry: ANSI/ASHRAE/IES Standard 90.1, Energy Standard for Buildings, Except Low-Rise Residential Buildings (or more commonly, ASHRAE Standard 90.1). It serves as the basis for many energy codes across the U.S. It is also the energy standard referenced by LEED and other green building certification systems. Every few years, Standard 90.1 is updated by….

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Toward Benchmarking Embodied Carbon in Buildings

Green Building

Toward Benchmarking Embodied Carbon in Buildings

Originally published on December 14, 2017 by BNP Media through the Building Enclosure Blog.   The term “Global Warming Potential” (GWP) is a measure of greenhouse gas emissions, such as carbon dioxide and methane. These emissions are causing an increase in the absorption of radiation emitted by the Earth, increasing the natural greenhouse effect. This may in turn have adverse impacts on ecosystem health, human health, and material welfare. With regard to buildings, GWP is gauged by carbon emissions and….

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GBCI Ramps Up Service Offerings to Green Building Industry

Green Building

GBCI Ramps Up Service Offerings to Green Building Industry

Originally published on November 15, 2017 by BNP Media through the Building Enclosure Blog.   You probably know Green Business Certification Inc. (GBCI) as the third-party entity that evaluates and certifies your office’s LEED projects. What you may not be aware of is that GBCI currently provides third-party verification services for certification and credentialing on a variety of platforms in addition to LEED. By implementing a standardized, scientific process through which a product, process, or service is reviewed by a….

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Leveraging Life Cycle Assessment in the Design Process

Green Building

Leveraging Life Cycle Assessment in the Design Process

Originally published on October 11, 2017 by BNP Media through the Building Enclosure Blog. While environmentally responsible design and sustainable building practices have become increasingly prevalent in the design and construction industry, decision-making for building products and materials have historically focused on single attributes such as regional manufacturing, recycled content, or consisting of renewable materials or certified wood. It used to frustrate me that there was not an efficient way to make holistic decisions about building products and materials that….

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How to Determine if Your Project is in a Flood Hazard Area

Green Building

How to Determine if Your Project is in a Flood Hazard Area

Originally published on September 18, 2017 by BNP Media through the Building Enclosure Blog. The debate about whether or not to build on floodplains will always follow flooding disasters. LEED and other sustainable design certification systems encourage teams to locate development above certain floodplains. However, referencing this information is not something architects and engineers do everyday. Do you know how to determine if your project is in a flood hazard area? In the digital age, it is very easy to….

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