Cooling Coils are generally manufactured for horizontal airflow. If the
coil is to be mounted in a vertical duct, or the airflow is other than
horizontal, this must be specified when ordering.Coils are designed for ‘Contra-Flow’ i.e. with the water flow connection
on the air leaving face of the battery such that the cooling medium is
flowing in the opposite direction to that of the air. This gives the
maximum logarithmic mean temperature difference and therefore the
maximum performance. Coils can be designed for ‘Parallel Flow’ but this
must be specified at the enquiry stage.All Cooling Coils must be installed with the primary tubes horizontal.
The connections can be on the same side or on opposite sides, but if the
configuration of the connections is important, it must be specified in
your enquiry.Cooling Coils are available in depths from one to sixteen rows with
alternate rows equally staggered, to obtain maximum heat transfer.Heat Transfer Surface
The primary tubes are manufactured from solid drawn seamless copper
tube.Fins are of the smooth plate type produced from aluminium, vinyl coated
aluminium or copper and are punched with self spacing collars.
The primary tubes are mechanically expanded into the pre-formed collars
thus assuring a good metallic bond between the fins and tubes. This
results in uniform heat transfer with guaranteed performance throughout
the life of the coil. The tubes are brazed or silver soldered into
copper return bends ( where applicable ) terminating in tubular copper
flow and return headers each provided with a B.S.P. screwed male
connection. Flanged connections are available on request.
The cooling surface is housed in a casing produced from galvanised sheet
steel. Where the primary tubes pass through the casing, smooth belled
holes are provided to permit freedom of movement for expansion and
contraction. The casing is produced in channel and tray formation
suitably stiffened to prevent distortion. The flanges formed by the
casing sections can be drilled for attachment to adjacent components on
request. The bottom panel of the casing is formed into a drip tray with
a B.S.P. socket drain connection.
All Chilled Water Cooling Coils are subject to an air under water test
of 2000 kPa. Where higher working pressures are involved coils can be
tested up to 3500 kPa or twice their working pressure.Finish
Coils with a galvanised steel casing are generally supplied unpainted
but special finishes are available on request.