FEATURE ENCLOSURES & AIR MOVERS
sulphur from the natural gas. In the summer the equipment has to withstand high levels of UV radiation and daytime temperatures up to 55˚C in the shade. The company is supplying three
shelters for this project. Two employ active cooling and were delivered at the end of 2013; the third will house solar-powered instrumentation and uses passive cooling technology. The shelters are designed to protect SCADA systems – comprising remote terminal units (RTUs), telemetry network equipment and associated electronics – for the control infrastructure of a new gas pipeline on the coast of the Persian Gulf. All the shelters were constructed
using the techniques and composite materials that Intertec uses for its high performance ARCTIC range. In this instance, 85mm thick walls are employed, with 4mm inner and outer skins of GRP sheeting sandwiching a 77mm layer of insulating foam. The GRP material layers are inherently inert and virtually immune to the corrosive effects of salt and aggressive chemicals. Two of the instrumentation shelters
that Intertec has built for this project are near to the electricity grid and are able to use active cooling. Each is equipped with a custom 3kW air conditioning system;
and a special corrosion-resistant external heat exchanger was developed for the application. Another major design challenge involved creating a cooling system based on a CFC-free refrigerant such as R-134A that could work efficiently in very high temperatures. The third shelter will protect
instrumentation sited in a remote location. Here, all instrumentation power is derived from inverters, fed by batteries that are recharged by a photovoltaic generator. This system’s strict power budget means that even though the shelter has a very large volume of 142 cubic metres, its cooling system has to be entirely passive.
PASSIVE COOLING Intertec’s passively-cooled shelter comprises two adjacent walk-in rooms with their own entry doors. One room contains the rechargeable batteries, while the second room houses all the system instrumentation and electronics including a PLC, computer network, power inverters and a controller for the external photovoltaic generator. The overall dimensions of the contained area are 5.2m x 9.1m, with a floor-to-ceiling height of 3m; and the entire roof area is covered by a heat exchanger and
The passively-cooled shelters used for a natural gas project in the Middle East comprise two adjacent walk-in rooms
sunshade combination. The passive cooling technology Intertec
employs for this project is based on thermo-siphoning using water – which is cooled and heated by the natural swing of day and night temperatures. The rear of the equipment room houses an 8,000 litre thermally stratified water tank connected to two closed-loop thermo- siphon systems formed by internal wall- mounted and external roof-mounted heat exchangers. The water circulates entirely due to natural convection.
Intertec
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Enter 14 24 MARCH 2014 | DESIGN SOLUTIONS / DESIGNSOLUTIONS
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