Kitchen Hoods The purpose of kitchen hoods is

By admin on November 18th, 2007

Kitchen Hoods

The purpose of kitchen hoods is to remove the heat,
smoke, effluent, and other contaminants. The thermal
plume from appliances absorbs the contaminants that
are released during the cooking process. Room air
replaces the void created by the plume. If convective
heat is not removed directly above the cooking
equipment, impurities will spread throughout the
kitchen, leaving discoloured ceiling tiles and greasy
countertops and floors. Therefore, contaminants from
stationary local sources within the space should be
controlled by collection and removal as close to the
source as is practical.
Appliances contribute most of the heat in commercial
kitchens. When appliances are installed under an
effective hood, only the radiant heat contributes to the
HVAC load in the space. Conversely, if the hood is not
providing sufficient capture and containment,
convective and latent heat are spilling into the
kitchen thereby increasing both humidity and
temperature.
Capture efficiency is the ability of the kitchen hood to
provide sufficient capture and containment at a
minimum exhaust flow rate. The remainder of this
chapter discusses the evolution and development of
kitchen ventilation testing and their impact on system
design.