Articles by Steven G. Liescheidt, P.E., CSI-CCS, CCPR

Modular Heating Water Boilers

Modular boilers have come a long way in the past few years, along with load-matching strategies. Improving efficiencies, navigating critical tight spaces, and allowing for future growth are three reasons this option is heating up.
Modular boilers were reportedly first introduced in the 1960s.
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HRVs and ERVs For Classroom Ventilation Applications

Recovering sensible or total heat, wheels or cubes, optional add-ons like fans and filters and assorted sensors ... it takes some homework to specify the right energy-saving recovery ventilator for your school application.
It doesn’t get much more sensitive in HVAC design than designing ventilation systems for the schools that our youth occupy during their learning years.
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Motors For Use With VFDs

The questions can pile up quickly when it’s time to specify a motor to pair with a variable drive. The information available sometimes leaves one wondering just as much about the information that is unavailable. Will a decision hold up not only in the actual application but also possibly in court? Wade into compatibility, spec terms, partial loads, and more as we try to get this motor running.
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Seismic & Wind Concerns

Earthquakes and strong gusts are threats in the physical world that creep into the HVAC design world of isolators, supports, and special louver considerations. Furthermore, a new legal world in terms of codes, insurance, and liability can leave inattentive engineers, owners, and manufacturers quaking in their boots. Read on to stay safe in more ways than one.
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VAV For Laboratory Spaces

Terminal devices, pressurization, supply air, proper exhaust … those factors and more go into a well designed VAV system for sensitive lab applications. From general tips to changing details such as fabric duct elements, booster fans, and a new AMCA standard, the author equips you to succeed in one space that is no place for experimentation.
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Commercial Kitchen Ventilation Design Considerations

After reviewing the methods and pros/cons of various hood designs, the author moves on to ventilation alternatives, details like equipment placement and insect control, and maintenance tips. Finish up with a design checklist that will never go stale, garnish with reading recommendations, and you’re ready to serve up a healthy design the next time an order is placed.
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PerSPECtives: The Product Selection Matrix

CLEARLY PRESENTED PROS AND CONS? YES, PLEASE.
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PerSPECtives: Evaluation Requires Measurable Criteria

The more articulation, the less litigation.
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perSPECtives: SPECIFICATION Formats

FOR CLARITY AND EFFECTIVENESS, PROPER PLACEMENT CAN BE HALF THE BATTLE.
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perSPECtives: TAKE IT FROM The Top

Although it is generally understood that the documents prepared by the architect and engineer are not used to describe the means and methods of construction, referring to these documents as "construction documents" can imply otherwise. This is why it is good to have a clear understanding that the "contract documents" are the documents that include the drawings and specifications that communicate the design intent of the architects and engineers. The actual construction procedures, means, and methods are the responsibility of the contractor(s).
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