HOT WATER HEATING COILS |
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General All heating coils can be manufactured to suit either vertical or horizontal air flow, but the application 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 heating 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. One row and two row coils with opposite side connections can be installed with the primary tubes either vertical or horizontal. Coils with more than two rows and one row or two Heat Transfer Surface Plain tube coils are available for anti-frost applications or where the pre-heating of unfiltered air is required. |
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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 |
Casing The heating 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 |
Testing All Hot Water Heating Coils are subject to an air under water test of 2000 kPa. Where higher working pressures or extreme temperatures are involved coils can be tested up to 3500 kPa Finish |
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