David Sellers
 David is a Senior Engineer with Facility Dynamics Engineering. His background includes over 30 years of experience with commissioning, design engineering, facilities engineering, mechanical and control system contracting, and project engineering in a wide array of facilities, ranging from hospitals and semiconductor clean rooms to commercial office buildings to research/pilot projects in the energy efficiency and sustainability arena. While working in these venues, he has performed new construction, renovation, and remedial engineering in the central plants, air handling systems, control systems, medical gas systems, fire protection systems and other supporting utilities serving, commercial building, health care facilities, and manufacturing processes. David also provides technical training and develops technical guidelines on retrocommissioning and commissioning field techniques and engineering fundamentals in a number of venues. David has BS in aeronautics with a major in Aircraft Maintenance Engineering from Parks College of St. Louis University. User Stats
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A Field Guide for EngineersRecent PostsDesign Review - Same Frame Size, Different Fan Sizes - Part 2May 13, 2008 | Link This | Email this | Comments (0) In my previous post, I looked at how for a given frame size in a modular rooftop air handling unit product line, there were several fan options avaialble and that these different fan options had efficiency and first cost implications. In this post, we will see how these factors translate into operating cost when you take a look at them from a life cycle cost perspective. To understand the life cycle cost implications of the proposed fan selection versus the other options, I needed two pieces of information; the annual operating cost for each fan type and the cost differential associated with changing the fan selection to one of the other options. Recent PostsDesign Review; Leveraging Opportunities Before Ideas Become RealitiesMay 10, 2008 | Link This | Email this | Comments (0) A friend and client of mine recently sent me a copy of a proposal he had solicited from an equipment manufacturer for a turn-key installation of three air handling units and asked if I would review from a commissioning and engineering perspective. The units were intended to replace three aging direct expansion package systems serving a hotel ballroom. The new equipment would be double wall, modular rooftop air handling units served by a recently renovated and expanded chilled water plant. The project and proposal included the expansion of the facility's DDC system to serve the air handlers and related utility systems. All-in-all, the new equipment has the potential to take a major step forward in terms of providing improved performance and efficiency, better turn-down capability and higher quality equipment to serve a critical hospitality industry function. B...Read More Recent PostsThe 16th National Conference on Building CommissioningApril 22, 2008 | Link This | Email this | Comments (0) I arrived at the 16th National Conference on Building Commissioning late in the evening yesterday and became immersed in passionate discussions about the state of the industry, the benefits of utility incentive programs, the potential for energy savings in the existing buildings stock versus the new construction market, the difficulties created by the pressures of schedule and finance in new construction commissioning, and that was just in the first 30 minutes. I have been attending the conference since 1997 and always find myself looking forward to the chance to network with my peers, learn from the experience of others, and be involved in some small way in charting the course for the commissioning industry. There have been a lot of good things that have happened at these conferences for me. For one thin...Read More Recent PostsLooking Back at my Educational Experience; Reflections on Wired Engineering's "Top 5 Reasons it Sucks to Be an Engineering Student"April 19, 2008 | Link This | Email this | Comments (3) I don't know how many of you took a look at Michael Ivanovich's Wired on Engineering Education post, but in it, he points you to a blog article on the Wired magazine’s website titled “Top 5 Reasons it Sucks to Be an Engineering Student”. The article has generated a flurry of responses (the most recent was posted on April 19th, which is the day I am writing this) and as I read through some of them, I had mixed feelings about the article and responses. On the one hand, I was encouraged that folks were dialogging about what they thought the problems were with the learning process; you can't fix a problem that nobody is acknowledging. But on the other hand, I was sad because it seemed like so many students found the path to their cho...Read More Recent PostsTroubleshooting a Screw Chiller - Adding Up Clues and Building ConfidenceMarch 29, 2008 | Link This | Email this | Comments (0) When I started my last post on the cooling tower level control issue on a current project, I had planned to use a string of posts to discuss what we learned on the project. But, it turned out that Michael Ivanovich (CSE Editor in Chief) was putting together the April issue, which focused on campus systems, and my pending string of posts looked like a perfect article for the issue to him. So watch for the April issue of CSE if you want to find out more about the cooling tower issues I mentioned or just want to learn more about campuses and engineering on them. Meanwhile, we've run into several other interesting problems on the project that I thought I would share.
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