Energy Efficiency Measures
LABORATORY FUME HOODS
 Fume
hoods can be the largest source of energy waste in laboratory buildings since
they move large quantities of conditioned air directly outside. This air must be
replaced by fresh air which must be heated or cooled, thereby adding to energy
needed for both fans and conditioning equipment. Energy-efficient fume hoods use
variable air volume motors to drive fans whose speed is changed depending on the
proximity of the user and the degree to which the sash is opened. As the sash is
opened to a greater extent, flow is increased so that the face velocity of air
over a given cross section of the sash opening is constant. This safeguards
scientists while minimizing air flow, thereby saving HVAC energy. Efficient fume
hoods also employ occupancy sensors which automatically increase exhaust air
rates when users are close to the hood. |
