Berkeley Hood: a High-Performance Fume Hood
Lawrence Berkeley National Laboratory has developed a promising new technology, a
High-Performance Fume Hood, referred to as the Berkeley Hood in this document. The Berkeley hood reduces airflow requirements by 50 to 70 percent while
maintaining, or enhancing, worker safety. Airflow reduction cuts energy costs about $2,100 per year per hood installation, on
Berkeley Lab’s hood design uses a "push-pull"
approach to contain fumes and exhaust them from the hood. Small supply fans located at the top and
bottom of the hood’s sash, or “face,” gently push air into the hood (see Figure 3). These low-velocity airflows create
an "air divider" that separates the fume hood’s interior from the exterior (unlike an air curtain approach that uses high-velocity airflow).
Berkeley Lab’s air-divider approach of separating and distributing air (See Fig. 4) leads to
greater containment and exhaust efficiency. The result is an extremely effective and energy-efficient
Revolutionary Design Delivers
percent ventilation reduction and associated energy savings, the Berkeley Hood
offers design features that deliver a range of benefits, including:
Simpler design than the state-of-the-art VAV fume hood systems offers
easier and less expensive installations.
Constant volume operation ensures that energy efficiency is not
dependent on the operator.
Clean room-air flowing into the operator’s breathing zone reduces
potential hazard from fumes.
Supply airflow patterns reduce dangerous eddy currents and vortexes,
improving containment and exhaust performance.
new construction projects, designers will be able to specify the Berkeley Hood
and easily achieve energy cost savings.
The Berkeley Hood is expected to have a cost premium over a current
standard hood. However, this cost
premium can be offset with savings from installing smaller ducts, fans, and
central plants, as well as simpler control systems, Combined, these features
yield a lower overall first cost than standard hood systems.
retrofit projects, Berkeley Hood users will realize critical benefits beyond
energy savings. Typically, laboratories
are “starved” for air as their need for additional hoods has grown. In some cases, low airflows cause inadequate
exhaust and increased potential for hood spillage. Since increasing airflow is very costly in most cases, many
laboratories cannot add new hoods. By
replacing existing hoods with Berkeley Hoods, users can increase the number of
hoods or improve exhaust performance.
Based on conservative assumptions, researchers estimate
the new Berkeley Hood could save the U.S. over 8,000 GWh/year (assuming 75
percent market penetration). This
amounts to over $1.2 billion in energy savings annually.