Understanding Electronically Commutated Motors

Posted by Eveline Killian on Aug 2, 2017 10:00:00 AM

Although electronically commutated motors (ECMs) are specified in efficient buildings, and energy efficiency programs provide incentives for their installation, I only had a cursory understanding of the difference between this technology and traditional shaded pole or permanent split capacitor type motors.  What makes ECMs more efficient?

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Topics: Energy Efficiency, Building Performance & Technology

An Energy Efficiency Horoscope

Posted by Jennifer Chiodo on Jul 26, 2017 10:00:00 AM

Imagining an energy efficiency horoscope for three of its most promising players …

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Topics: Energy Efficiency

Magnetic Bearing Chillers - Proven Efficiency and Reliability

Posted by Eveline Killian on Jul 19, 2017 10:00:00 AM

Office building cooling energy in the United States accounts for 7.4% of this country’s total commercial energy consumption, and chillers alone provide 31.9% of this space cooling. (The largest provider of space cooling is packaged rooftop units, which account for over 51%[1].) So, when an improved technology is proven to be successful, it’s worth the time to explore its merits.  And so, it is with magnetic bearing centrifugal chillers.

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Topics: Energy Efficiency, Building Performance & Technology

The Importance of Functional Performance Testing BAS Outputs

Posted by Walker Calderwood on Jul 12, 2017 10:00:00 AM

Previous blog posts from my colleagues and I contain a detailed explanation of functional performance testing (FPT), an overview of how functional performance tests are created, and specific examples of how conducting FPT contributes to better building performance and energy savings.  In this post I would like to expand upon the previous post “Functional Performance Testing Done Right: Details Matter.”

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Topics: Building Cx & Design Review, Energy Efficiency

CleanMed Conference Report

Posted by Katie Mason on Jul 6, 2017 10:00:00 AM

I recently attended the CleanMed Conference and Exposition in Minneapolis, Minnesota. This event, organized by Health Care Without Harm and Practice Greenhealth, “has gained a global reputation as the premier conference on environmental sustainability in the health care sector.”[1] This blog post will discuss the conference content as well as a few key points from several of the workshops I attended.  

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Topics: Sustainability, Building Performance & Technology

High Performance Neighborhoods: Sustainable Water Use

Posted by Gretchen Schimelpfenig on Jun 28, 2017 10:00:00 AM

Earlier this month, the New England chapter of the American Institute of Architects’ (AIA) Committee on the Environment held their annual leadership summit in Burlington, Vermont. As the keynote speaker, Clark Brockman – principal at SERA Architects and a leader in his field – delivered a presentation on district scale solutions for net zero energy and water in communities.

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Topics: Sustainability, Public Policy

Acting Locally After Paris Accord Withdrawal

Posted by Daniel Tuhus-Dubrow on Jun 21, 2017 10:00:00 AM

Following the withdrawal of the United States from the Paris Climate Agreement and the abdication of responsibility at the federal level to address climate change, the action now moves to states, municipalities, businesses and individuals. Fortunately, there are a lot of exciting things happening right now in these arenas, which could go a long way toward filling the current leadership vacuum. This post will survey some of the efforts underway, with a focus on initiatives aimed at improving energy efficiency in buildings.

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Topics: Public Policy, Energy Efficiency

The Advantages of Publicly Accessible Controls Documentation

Posted by Rick Stehmeyer on Jun 14, 2017 11:00:00 AM

Commissioning agents do a large amount of review of other people’s work and products.  The building commissioning (Cx) process is a quality-assurance process for verifying and documenting that the performance of facilities, systems, and assemblies meet defined objective criteria[1].  Therefore, to verify facilities and systems, I need access to a product’s technical documentation.  In the commercial building space, almost all documentation is online and readily available via a quick Google search.  Notice that I said almost.

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Topics: Building Cx & Design Review

Adapting to Climate Change: Why Do It, and How to Begin?

Posted by Rachael Straub on Jun 7, 2017 10:00:00 AM

I appreciate NASA’s Global Climate Change website as a resource for scientific evidence of the existence of human-made climate change (https://climate.nasa.gov/evidence/). The facts are simple, such as the rate of global sea level rise during the last two decades being nearly double that of the last century. Of course, the most telling fact is that the planet's average surface temperature has risen about 2.0 degrees Fahrenheit (1.1 degrees Celsius) since the beginning of global temperature record keeping (around 1890). Most of the warming occurred in the past 35 years, with 16 of the 17 warmest years on record occurring since 2001. Essentially every year is warmer than the year before and is the warmest year on record. That is, until the next year.

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Topics: Sustainability, Public Policy

The Emerging Business Model of Energy-as-a-Service (EaaS)

Posted by Eveline Killian on May 24, 2017 10:00:00 AM

I recently read an article about an emerging business model, Energy-as-a-Service (EaaS), which is a deviation from traditional power purchase agreements (PPAs) and Energy Management services.  In its basic form, “energy as a service” is the idea that an outside service company guarantees a building’s future energy costs.  If the building uses more energy than predicted, the service company is responsible for the difference.  But if the building uses less energy than contracted, the service company profits.  From the building owner’s perspective, it’s a way to manage overhead electricity costs that fluctuate by time-of-day rates and demand peaks, and fossil fuel costs that fluctuate throughout the year. For the service company, it is a way to be creative in energy supply and management, and an incentive for efficiency improvement.

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Topics: Energy Efficiency

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