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For electronic and telecommunications installations
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Control the internal temperature of enclosures containing sensitive, heat-generating equipment
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Sealed enclosures containing heat-generating electronic or telecommunications equipment are
notoriously difficult to cool, especially in remote or inaccessible locations. SPC's Enclosure
Cooling System overcomes the problem in an imaginative and cost-effective way.
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Passive enclosure cooling often functions without the need for any moving parts.
Internal heat energy is collected in a thermal store by day. At night, when the
external temperature falls below the internal temperature of the enclosure, a heat pipe
transfers the energy from the thermal store to the exterior of the enclosure.
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The processes of melting, vaporising, condensing, and solidifying continue day after day
without the need for human intervention. They maintain internal temperatures within a specified
set of design conditions – typically below 40°C.
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Phase changes keep pace with internal and external temperatures
During the day, when external temperatures soar, the combined heat load produced by the
internal heat-generating equipment and the ambient temperature is at its heaviest.
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An internal heat exchanger conducts heat energy to a heat-storing phase-change wax. Once
melted, the wax holds its heat energy until the outside temperature falls below that
of the installation. An internal fan may be required if the natural movement of air
within the enclosure is insufficient to transfer the internal heat load.
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As the external ambient temperature falls, a heat pipe containing a liquid-to-vapour phase-change material comes into
play. The heat pipe transfers heat energy from the internal thermal store to the external environment, where a radiator dissipates it.
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The beauty of the system is that it is entirely self-regulating. So long as external night-time temperatures fall
below internal temperatures, the store of daytime heat energy will always be dissipated at night.
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For a simple general explanation of the principles behind heat-pipe technology visit the heat
pipes page. For an in-depth, tutored explanation, ask about the presentations on heat pipes
conducted by SPC as part of the Chartered Institution of Building Services Engineers' Continuing
Professional Development programme.
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Enclosure cooling works automatically, day in, day out
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The benefits of enclosure cooling are huge, in terms of cost-effectiveness and peace of mind. Once installed,
a passive cooling system goes on working night and day with virtually no maintenance.
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Apart from the fans, there are no moving parts, so very little can go wrong. Your enclosure cooling system will
probably outlast the equipment it is protecting.
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The phase-change waxes are non-corrosive and non-toxic. There is no noise and no electrical interference. And
since the heat pipe is sealed and virtually maintenance-free, it can be installed in hazardous areas.
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Best of all, the mechanism consumes no energy, so the running costs, again apart from the fans, are negligible.
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Sealed and tested units for specific tasks
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The SPC Enclosure Cooling System comes in a range of capacities and control temperatures. By choosing
appropriate phase-change materials, we can build an Enclosure Cooling System to cope with a specific
set of design conditions and external ambient conditions.
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Each assembly is fully factory-tested.
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Further information:
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