Sakraida is a principal engineer with Sakraida & Associates, LLC (Denver, CO) which is a consulting and forensic engineering firm. He has 30 years experience in the design, construction, and operation of cleanroom, pharmaceutical, laboratory, and other high-technology facilities. He is a member of ASHRAE, ASHE, ISPE, and IEST. He can be reached at firstname.lastname@example.org.
Appropriately enough, a good variable airflow design accommodates and refines a number of design variables. Particle monitoring strategies, minimum supply air calculation, HVAC sequencing, and space pressurization are just a few stops on the way to spotless performance.
motor-driven vapor compression chillers are much more energy
efficient than absorption chillers, then why are we even having this
conversation? In a hunt for LEED® points or in applications with
certain demands, absorption could be just the ticket to
sustainability and/or economy.
OK, so “easy” may not be a word that comes to mind for designing such
sensitive environments. However, that doesn’t mean you can’t produce a
solid cleanroom design by tackling issues in a logical sequence. This
article covers each key step, down to handy application-specific tips
for adjusting load calculations, planning exfiltration paths, and
angling for adequate mechanical room space relative to the cleanroom’s
In addition to serving as a handy reference on the various
dehumidification technologies and their profiles, this article uses a
manufacturing scenario to explore load-related questions and other design
pitfalls. Will human occupancy make much of a difference? What valves does your
humidifier have? And exactly what’s in that room, anyway?
Why was one floor’s laboratory ventilation failing to keep up, when it was even the closest floor to the rooftop fans? Some system sleuthing led two engineers to a fitting conclusion. Read more stories in May Issue 2017.