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S & P Coil Products Ltd
THERMASAIL Radiant Conditioning Sails
At the heart of the SPC’s THERMASAIL system is a
unique, patented composite aluminium sheet panel. Structurally
rigid, the panel is used elsewhere in the automotive and marine
construction industries, because of its high strength and low weight
characteristics. It is a building material in its own right.
The good thermal conductivity of the aluminium
panel ensures high efficiency for SPC radiant heating and cooling
products.
Basic Operation
Chilled or hot water is introduced into the panel
via copper pipes which are mechanically fixed into aluminium
extrusions. The extrusions are then bonded and riveted to the upper
surface of the panel ensuring excellent and reliable heat transfer.
Cooling
When chilled water is passed through the coil,
the large chilled lower surface cools the air against it. It also
absorbs radiant gains from the room. The air above the panel is also
cooled, and this cooled air convects around the edges of the sail.
The unique strength of the panel eliminates the need for any
structural sidewall allowing unrestricted cooled air movement and
high cooling performance.
Heating
When warm water is passed through the coil, the
lower surface of the sail operates as an efficient radiant heater.
The air above the panel is also warmed, and convects into the room
space. With a large heated area, low water temperatures can be used
which maximises boiler efficiency. The system has a low inertia,
reacting very rapidly to heating and cooling demands, ensuring
minimum energy consumption.
Cooling with THERMASAILS
The maximum output of SPC’s THERMASAILS is
governed by dew point. The water temperature must be carefully
controlled to ensure that condensation does not occur on the
THERMASAIL. This means that in the UK the difference between the
water flow temperature and the room temperature is likely to be
about 8 or 9 degrees.
The cooling load is calculated in the normal way,
except that there are no latent loads because the flow temperature
is kept above dew point. Radiant gains can also be ignored when
sizing the THERMASAILS because of the radiant cooling effect, but
they must be included in flow rate and chiller load. Remember that
the radiant cooling effect will also mean the resultant comfort
temperature will be about 2 or 3 degrees cooler than the air
temperature.
Divide the cooling load by the THERMASAIL cooling
output given below to find the area of THERMASAIL required. This
area is divided into suitable sail shapes and sizes, (e.g. 1.2m x 3m
sails).
The resultant THERMASAILS should be evenly
distributed across the ceiling to provide uniformly comfortable
conditions. Services such as lighting, fire alarms, sprinklers etc.,
can be fitted to, or through the THERMASAILS, so there is no need to
compromise on systems layout.
Heating with THERMASAILS
Heat loads are calculated in the normal way,
however with radiant heating using THERMASAILS comfort temperature
is achieved with an air temperature 2 degrees lower than
conventional heating, which significantly reduces the heat load.
Divide the heat load by the output of the THERMASAIL given in the
graph below to give the area of THERMASAIL required for heating.
The surface area of THERMASAILS is likely to be
governed by cooling requirements, so given an area of THERMASAIL for
cooling, the graph below can be used for calculating the required
mean water temperature, which will normally be relatively low;
increasing boiler efficiency. It is possible to put a separate coil
on a THERMASAIL for heating, in which case the heating area required
is added to the cooling area.
Note: - a THERMASAIL used for heating provides
more heat output than an equivalent THERMATILE radiant panel as
there is no upper insulation, which means there is additional
convected heat output.
Heating THERMASAILS should be evenly spaced
across a room to provide a comfortable even distribution of heat.
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