Why use Naturalvent
May 26th 2010 08:11
NATIONWIDE LOUVRE COMPANY LIMITED
510 QUESLETT ROAD
GREAT BARR
BIRMINGHAM
B43 7EJ
Telephone 0121 360 6140
510 QUESLETT ROAD
GREAT BARR
BIRMINGHAM
B43 7EJ
Telephone 0121 360 6140
Principles of Natural Ventilation
Naturalvent Terminal
For air to move into and out of a building, a pressure difference between the inside and outside of the building is required. The resistance to flow of air through the building will affect the actual air flow rate. In general, controlled natural ventilation and infiltration are driven by pressure difference across the building envelope. The pressure difference is caused by:
wind (or wind effect);
difference in air density due to temperature difference between indoor and outdoor air (stack or chimney effect); or
combination of both wind and stack effects.
Flow caused by wind
Louvre
Major factors affecting ventilation wind forces include:
average wind speed;
prevailing wind direction;
seasonal and daily variation in wind speed and direction;
local obstructing objects, such as nearby buildings and trees;
position and characteristics of openings through which air flows; and
distribution of surface pressure coefficients for the wind.
Imperial College - London
Guidelines for natural ventilation
The following guidelines are important for planning and designing natural ventilation systems in buildings:
a natural ventilation system should be effective regardless of wind direction and there must be adequate ventilation even when the wind does not blow from the prevailing direction;
inlet and outlet openings should not be obstructed by nearby objects;
windows should be located in opposing pressure zones since this usually will increase ventilation rate;
a certain vertical distance should be kept between openings for temperature to produce stack effect;
openings at the same level and near the ceiling should be avoided since much of the air flow may bypass the occupied zone;
architectural elements like wingwalls, parapets and overhangs may be used to promote air flow into the building;
topography, landscaping, and surrounding buildings should be used to redirect airflow and give maximum exposure to breezes;
in hot, humid climates, air velocities should be maximised in the occupied zones for bodily cooling;
to admit wind air flow, the long faηade of the building and the door and window openings should be oriented with respect to the prevailing wind direction;
if possible, window openings should be accessible to and operable by occupants;
vertical shafts and open staircases may be used to increase and generate stack effect;
openings in the vicinity of the neutral pressure level may be reduced since they are less effective for thermally induced ventilation;
if inlet and outlet openings are of nearly equal areas, a balanced and greater ventilation can be obtained.
Louvred Doors and panels
For more information contact Naturalvent Limited on 0121 360 6140
Solar Shading Panels NLC-SOL75
Naturalvent Limited use new computer programmes to design solar shading systems.
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Natural ventilation combined with Solar Shading / Brise Soleil is the best solution for a better enviroment.
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