6 months ago

ECOBuilder-Specifiers Journal spring2018


THE SIMPLE BENEFITS OF TRENCH HEATING By David Taylor, Dunham-Bush Regional Sales Manager specialising in trench and perimeter heater Selecting appropriate heating and cooling emitters for specific application to a building makes a vital contribution to both efficiency and the environmental comfort of the occupier. Good air quality, comfortable ambient temperatures, low noise levels and appropriate lighting have proven to enhance the performance of the people working within the building. to prevent unsightly condensation on large glazed areas and outside walls. Perfect for a wide variety of commercial and institutional buildings, for example, high-rise offices, car showrooms, airports, universities and exhibition centres, where extensive glazed areas are a common feature. Natural convection heating trench systems have no moving parts and are effectively silent, making them ideal for acoustically reverberant spaces. Low temperature hot water is the most commonly used heating medium, Trench heating systems using low temperature hot water have inherent low water content, making them extremely efficient and responsive to the solar heating gain experienced in large glazed facades. Fan-assisted trench units with cooling coils can be used to offset these solar gains still further during the summer months, again with no additional grilles or systems, other than making chilled water available. These systems can integrate with building management systems to meet both comfort and time schedule requirements, and on forced convection units the warm up times can be further reduced by increasing the fan speed, further reducing waste. Trench heaters can be modified to integrate with a ventilation system, thus allowing primary or fresh air to be distributed with no additional floor grilles being required and local tempering of the air if required. Not requiring any wall space yet providing an even distribution of heat along the entire length of the emitter, trench systems provide an effective, aesthetically attractive, non-intrusive heat emitter solution for the architect, engineer and client, delivering comfort in hard to serve areas. A major consideration when selecting heat emitters for a building must be the variable occupancy, building usage, buildings orientation and the possibility of having four seasons’ weather in one day, which is common in the UK climate. These considerations are of particular importance in buildings with large glazed areas, where solar gains and losses are common. Heat emitters that respond quickly to these changes can increase the seasonal efficiency of a building substantially, reduce CO 2 and NOx emissions and at the same time increase the well-being of occupants and enhance their performance. Trench heating systems provide a highly effective, tried and tested solution for countering down draughts on cold surfaces, helping however electric trench emitters are available for certain applications. Fan assisted trench or forced convection systems are a compact alternative when higher outputs are required and space is restricted. In addition, fan assisted trench emitters can incorporate a cooling coil and drip tray, typically available as either a 2-pipe or 4-pipe application, similar to fan coil units. Natural convection units require little if any maintenance, whilst fan assisted units are, by their very nature, readily accessible for routine maintenance with no need to consider the dangers of working at heights. All electrically powered heated trench emitters must comply fully with EN 60335-2-30: (heaters intended to be built into floor areas and having a grille or opening at or near floor level shall be constructed so that any water spillage does not present a hazard). Dunham-Bush manufacture standard and bespoke systems to the client’s dimensions and outputs, to suit all applications. Floor grille bars can be finished in stainless steel, anodised aluminium, bespoke cast iron and wood from sustainable sources and can be selected to meet any architectural brief. 44 ECOBUILDER - THE SPECIFIER SPRING 2018

BIG CATS PERFECT FOR TRANQUIL SPACE AT NEW LOUVRE ABU DHABI The New Louvre, Abu Dhabi Dunham-Bush has supplied United Arab Emirates based Intercool Central Air Conditioning Ltd with 247 of its Panther and 207 Puma Fan coil units to provide heating and cooling at the magnificent new Abu Dhabi Louvre Museum. Designed by the Paris based architect Jean Nouvel, the museum is organised like a traditional Arab city with separate galleries connected by walkways. A large 590ft radius dome shades the main structure underneath, while allowing shafts of light to rain down through the unusual woven roof. Water surrounds the museum and flows inside, allowing visitors to walk or sit near the interior pools between visits to the museum’s galleries. The selection of fan coil units was governed not only by thermal or air volume flow rate requirements, but also by constraints on the level of noise permitted in the room space. The powerful yet quiet Panther and Puma fan coil units fully satisfied the design brief to create the tranquil environment required in this prestigious building. The climatic conditions experienced in the UAE demand that only the highest quality materials be used in the museum’s construction and the comfort levels of their visitors were a major consideration for the designers. Dunham-Bush fan coil units combine the very latest design and manufacturing technology to provide the ideal solution to meet precise thermal and noise criteria. For further information contact Dunham-Bush Ltd Tel: 023 9247 7700 Email: ECOBUILDER - THE SPECIFIER SPRING 2018 45

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