Efficient Laboratory Hoods
Laboratory Hoods: Lab21 Efficiency Features vs. Conventional
A package of lab hood efficiency measures including heat recovery and automatic sash positioning.
Energy use per square foot in a modern laboratory can be five to ten times that of a typical office building. Because laboratories use significant energy and their design can influence energy use, a public-private partnership called Labs for the 21st Century was formed in 2002 to provide design guidelines for efficient lab operations. Many of these guidelines focus on improving laboratory ventilation systems, especially for fume hoods. This information assists laboratory designers and operators and encourages the building of high-performance labs.
Efficient laboratory fume hoods could employ a package of high-performance technologies to minimize energy consumption. The package would include high-efficiency variable speed fans and heat recovery to recover some of the energy in the conditioned air that is being drawn from the laboratory space around the hood. Automatic sash positioning could also be implemented with an occupancy sensor automatically closing the sash when no occupants are detected and the fume hood is not is use.
Depending on the size and needs of the lab, the Lab21 Best Practice guidelines suggest a variety of strategies, including manifolding hood systems for increased efficiency. With this strategy, multiple hoods can be ganged together in the same ducting system so that two variable speed fans can provide ventilation for all of the hoods. The same fans can also supply exhaust ventilation for general laboratory space. Still under development are technologies that will provide acceptable fume capture while dramatically reducing required face velocities and air flow requirements. (http://www.labs21century.gov/pdf/lowenergy_508.pdf, Aug. 2008)
Energy Savings: 30%
Energy Savings Rating:
Comprehensive Analysis What's this?
|1||Concept not validated||Claims of energy savings may not be credible due to lack of documentation or validation by unbiased experts.|
|2||Concept validated:||An unbiased expert has validated efficiency concepts through technical review and calculations based on engineering principles.|
|3||Limited assessment||An unbiased expert has measured technology characteristics and factors of energy use through one or more tests in typical applications with a clear baseline. |
|4||Extensive assessment||Additional testing in relevant applications and environments has increased knowledge of performance across a broad range of products, applications, and system conditions. |
|5||Comprehensive analysis||Results of lab and field tests have been used to develop methods for reliable prediction of performance across the range of intended applications.|
|6||Approved measure||Protocols for technology application are established and approved.|