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Why Invest in
an Air Curtain?
In buildings and businesses where entry doors or gates are
continually being opened and closed it is necessary to prevent
the undesirable inflow of cold air during winter time. Likewise,
if the building is air conditioned then it is appropriate to
protect the building during summer time against the entry of hot
air.
A well designed air curtain prevents the above mentioned thermal
losses (and so provides energy savings) of 75% to 85% Operating
costs are in the power consumption of the ventilators and the
unused (loss) performance of the heat exchanger of 15 to 25%. If
we calculate the achieved savings from the use of an air
curtain, in the majority of cases the return on investment
period is in the range of 1.5 to 3 years.
Return on Investment Calculation
The amount of air entering a building (Vw) can be derived from
the median air flow speed in the door opening (vw) and the size
of the door opening(Sd) Vw= Sd . vw
The thermal loss caused by air entering the building (Qw) can be
derived from the difference between the average temperature
during the heating period and the inside temperature (Δt), air
density(ρ), specific heat capacity (c) and the amount of air
entering the building (Vw). Qw= Vw . ρ . c . Δt
The thermal loss for the heating period is calculated by
multiplying the thermal losses by the length of the heating
season.
HOW TO ACHIEVE MAXIMUM AIR CURTAIN EFFICIENCY AND THEREBY
MINIMISE OPERATING COSTS?
Balanced Ventilation
In the area behind the air curtain it is necessary to have
balanced ventilation. If in the area behind the air curtain
there is over or under pressure, the air curtain cannot prevent
the natural balancing of pressure between the air outside and
the air behind the curtain. A high pressure difference can lead
to the air curtain becoming entirely ineffective.
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Correct
installation of the air curtain |
Correct
Installation
The air curtain needs to be installed as close as possible to
the opening in front of the air curtain both in terms of height and
distance from the opening in front of the curtain. The ideal
installation of the air curtain is on the top edge of the door. The
effectiveness of the air curtain depends namely on the volume and
speed of the air stream coming out of the air curtain. The volume of
air blown out of the air curtain does not change with distance;
however its speed rapidly declines.
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Air Curtain
Energy Saving
Document here
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High installation
of the air curtain
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For example, if the
air curtain is installed one meter above the top edge of the door,
the median speed of the air current at the top edge is approximately
half. So considering that the decline of the median speed of the air
current is not linear, such an installation causes losses of the
best curtain qualities above the opening, where they are actually
not utilized. |
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Air curtain
installed |
Likewise, the air
curtain must not be offset from the opening behind the air curtain.
If a gap between the air curtain current and the opening behind the
curtain is created, air enters through this gap and the function of
the air curtain is degraded. |
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Regular Cleaning of
the Air Curtain
Conclusion
The installation of an air curtain clearly brings substantial
energy savings. The level of savings and the length of time until
the investment into air curtain is paid back depends namely on the
proper design, construction, appropriate installation, correct
operation and maintenance of the air curtain. Based on long term
measurements and experience the air curtains are designed in such a
way as to achieve the highest possible curtain effect. The
construction elements and regulation are also designed so as to
eliminated the most common operation mistakes, which substantially
lower the curtain efficiency and energy saving.
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