MEMBRANE DIFFUSER |
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We
often face a requirement of cooling and heating using one
system. However, the way of distribution of air must be completely
different for both regimes to provide effective heating and
draught-free cooling. This contradictory requirements can
be resolved using a membrane diffuser that is divided horizontally
in the centre using thin impermeable textile - membrane.
This membrane can cover (and thus put out of operation) the
upper or lower longitudinal half of the diffuser. The upper
part is designed to diffuse air, the lower part is designed
to direct high-speed air flow downwards. The delivery also
includes a special flap with a servomotor that allows switching
over between both regimes of air distribution.
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Two
kinds of diffuser are combined in one product. A membrane, which
is made of flimsy impermeable fabric, is sewed horizontally in the
centre of a diffuser. The beginning of the membrane is attached to
a flap controlled by a servomotor. It covers either the top or the
bottom half of the diffuser. While heating, the membrane covers the
top half of the diffuser and the air is diffusing through the row
of openings downwards. The membrane covers the bottom half of the
diffuser and the air is diffusing upwardly through permeable fabric
/ fabric modified by means of microperforation while air-cooling.
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FLAP:
Is used to switch over between the two modes. The flap is made of PMS
or PMI fabric (according to fire resistance), inner construction is made of galvanized steel. The length is 400 mms always. |
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| The flap D<=630 mm is hung in 1 point, the flap D>630 mm is hung in 2 points. | |
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The
main purpose of a membrane diffuser is to adjust the air flow to
the heating
or cooling mode. The
diffuser is not destined for temperature regulation at a work place,
which should be primarily regulated
by a heat supply control. The transition of the flap position lasts
cca. 140 seconds. Because the
membrane vibrates intensely while being displaced, the frequency of
transitions should be limited to
the needful minimum. We recommend to condition the transition act by
a certain temperature difference.
E.g. When the supply air is colder than the air in the room, the air
flow should be altered from the
rectified current to the diffused one by means of the flap. Proper
hysteresis e.g. 2 - 3 °C can reduce the
frequency of transitions to the minimum. The supplier will take account
of possible inobservance of the recommendation in case of complaint
procedure. |
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