Labs21 Phone Forum
July 26, 2004
Practical Design Approaches for Efficient Cleanroom
Fan Systems
Read
a summary of the discussion (
2 pp., 772 KB, about
PDF)
Featured Speaker: Peter
Rumsey, PE, Rumsey Engineers. Download
the presentation.(
35 pp., 667 KB, about
PDF)
Typically, the largest, and perhaps easiest, target for building
energy use reduction in a cleanroom facility is in the fan systems.
As one of the largest segments of a cleanroom's electricity consumption,
the fan systems (makeup and recirculation) are, therefore, obvious
targets to reducing energy costs.
This presentation covered the unique design issues and opportunities
relating to efficient cleanroom fan systems. The presentation discussed
measured benchmark data on recirculation air change rates and also
highlights air system efficiency metrics developed from benchmarking
measurements (shown in the table below). The presentation also reviewed
low pressure drop design concepts and configurations that offer
the highest efficiency systems. Finally, the presentation explored
Fan Filter Units (FFUs), a popular configuration for smaller cleanrooms,
design approaches based on FFUs, and the relative efficiency of
different FFU units.
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Metric
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Load Estimate
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Baseline
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Recirculation Air
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W/cfm
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Airflow rate is a design parameter (ACH, sf)
or is known from certification air balancing
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0.45 W/cfm
(2,222 CFM/kW)
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Makeup Air
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W/cfm
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75% of the design airflow or provide measurment
justification
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1.08 W/cfm
(926 CFM/kW)
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Biography:
Peter Rumsey is the Owner and Principal in Charge of Rumsey
Engineers. He has over 20 years of experience in the engineering
and energy field, and is a nationwide leader in sustainable and
efficient design of government, scientific, and private sector buildings
and critical environments, such as laboratories, cleanrooms, data
centers, and research facilities.
Mr. Rumsey's passion for energy efficient and sustainable design
issues has led him to publish several papers on HVAC energy efficiency.
He is the author of a column in Environmental Design and Construction
magazine discussing and debating sustainable design issues. For
Critical Environments, Mr. Rumsey wrote an article on Laboratory
Efficiency in the ASHRAE Journal and was a team leader in
a Data Center Efficiency Design Charette for the Rocky Mountain
Institute.
He has worked on the design and improvement of buildings in three
continents and is a registered mechanical engineer in nine states,
including California, Oregon, Arizona, and Texas. He is a Certified
Energy Manager and a member of the ASHRAE Cleanrooms Committee (TC9.11).
In 2002, he was awarded the Energy Engineer of the Year Award from
the Bay Area chapter of the Association of Energy Engineers. Mr.
Rumsey has a Bachelors of Science in Mechanical Engineering from
the University of California at Berkeley.
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