INSTALLATION NEWS Taking control of learning
valves and actuators to complete the system. LYNX terminal unit controls allow energy savings and reduce carbon emissions by providing only the exact amount of energy required to terminal units. LYNX terminal unit controllers also ensure that HVAC plant operates only when parts of buildings are occupied and demanding energy. It sets ideal parameters and ensures the plant is controlled energy efficiently.
Combining LYNX terminal
The prestigious new City of Westminster College Paddington Green Campus in central London has been fitted with a sustainable building control system from CentraLine by Honeywell. Specified and installed by system integrators Ashdown Controls, the CentraLine BMS features a suite of energy efficient products to control the College’s HVAC systems. Designed by leading Danish architects schmidt hammer lassen and opened in January 2011, the £102 million Campus has just won a 2011 RIBA Award for architectural excellence. The 24,000sq m design features a distinctive stepped façade and full height internal atrium.
It
incorporates a restrained palette of materials and finishes, including exposed concrete and pale timber, to create a modern, light and spacious feel. The diversity of spaces within the College had to be reflected in the overall HVAC design and, in particular, the central building management system is designed to control heating, air conditioning and ventilation in order to maximise energy efficiency. Universities and colleges are very well suited to the use of programmed and monitored automation systems to save energy. An energy efficient building control system such as CentraLine can help reduce energy costs by up to 30% and provide optimum operational performance and managed energy consumption without compromising comfort.
Energy saving
More than 30 CentraLine HAWK integrated HVAC controllers and 300 LYNX terminal unit controllers were installed at the Paddington Green Campus, along with four CHB2512A touch screens and associated
unit controllers with HAWK controllers provides a complete Open Protocol solution from field level through to the enterprise level.
If all factors, such as time programmes, room occupancy, energy generation and distribution, set point values and air quality are continuously monitored for potential savings, then exceptionally economical operation is possible. Maintaining air quality in the different areas and matching it exactly to the number of students and staff leads directly to more efficient operation. Manual switching overrides allow facilities and maintenance teams to react quickly to unscheduled activities without having to carry out the tedious process of altering the time programme. Rob Oakley of Ashdown Controls commented: “The suite of products which CentraLine could offer us perfectly suited the technical nature of the building. CentraLine has a great range of energy efficient products which could be easily integrated to allow the required levels of control and monitoring, while ensuring the right ambience and comfort.”
Sustainability
The system perfectly complements the new Campus’ other sustainable features, which include a green roof, rainwater harvesting and movement controlled lighting to minimise power use and the building’s impact on the local environment. City of Westminster College is a leading
provider of further and higher education in central London, and offers more than 200 academic and vocational courses each year to over 7,000 students. The new Campus provides superb facilities, including specialist science labs and workshops, a double-height sports hall, dance studio, fitness suite and the professional quality Sarah Siddons Theatre.
A cool solution for Central Saint Giles
Trox fan coil units have been selected for a striking new mixed-use development in central London. Incorporating energy efficient motors and featuring customised jet nozzle and grille designs, the fan coil units meet the extremely high performance requirements of the consultant at the same time as achieving the architect’s intentions for the visual impact of the space. The Central Saint Giles development provides 375,000 square feet of office space,
56 private apartments and 53 affordable homes, in addition to a restaurant and retail units. Situated in the Covent Garden/Bloomsbury area of central London it features an outdoor public piazza and an impressive reception area.
External appearance
When specifying the air handling scheme for the reception there were a number of important priorities. The external appearance of the fan coil units needed to meet the architect’s aesthetic objectives for the space and in addition, the unusual dimensions of the reception area presented specific air distribution challenges. The consultant for the project, Arup, wanted to prove empirically that the air handling equipment would perform exactly as anticipated before moving forward with the installation and ensure that the HVAC systems would meet low carbon requirements and be suitable for integration with a biomass boiler.
Trox was able to meet the demanding specification due to its broad product range, its ability to manufacture customised grilles, its technical expertise, and the facilities at its Thetford site for laboratory testing of equipment. Trox achieved the architect’s intentions for the visual impact of the space by supplying specially designed linear bar grilles. The architect did not want spacing bars next to the jet nozzles, and wanted all blades to line up. Trox achieved this by machining customised grilles for the project with circular holes into which the jet nozzles fit.
Optimum design
Trox also worked with the consultants during the specification phase to determine the optimum design of jet nozzle to create the required comfort requirements. The company was then able to quantify and prove the performance of the equipment under laboratory conditions at its testing facilities in Thetford. To meet the low carbon requirements for the project, Trox recommended fan coil
units featuring energy efficient EC motors. It also advised the customer on the sizing of the fan coils to ensure that they worked effectively with the higher than average water temperatures in the system resulting from the use of a biomass boiler. Nick Howard, Key Account Manager of Trox UK, commented: “The technical requirements for the equipment were extremely stringent, and the process for proving each element of performance was painstaking. But our testing facilities are designed specifically to meet this need, and ongoing investment in our manufacturing capabilities has meant that we are ideally positioned to create bespoke designs cost effectively and within sensible lead times.”
Armstrong delivers the goods
Vertical inline pumps from Armstrong have delivered cost savings and freed-up valuable space in the plant room for the prestigious redevelopment of the King’s Cross Eastern Goods Yard. The £170 million project forms part of one of London’s development projects involving a site with a rich industrial history. It will provide a new campus for the University of Arts, London (UAL) and includes Central Saint Martins College of Art and Design, which moves in this September. The UAL section of the development consists of a four-storey new build section linked to a refurbished Grade II listed Granary Building. When completed, the refurbished Eastern Goods Yard will also include retail areas, offices and public spaces. The priorities for the developer, King’s Cross Central Limited Partnership, and their M&E contractor BAM Services Engineering, were to obtain the most competitive installed capital cost for the plant room, with low carbon, highly energy efficient equipment,
and to make optimum use of space at this prestigious central London site.
Space saving
The equipment supplied for the project includes Armstrong 4392 Startwin IVS Series variable speed pumps (with integrated inverters) and 4300 Series vertical inline pumps with standalone IVS102 inverters, all fitted with space-saving Suction Guides and Flotrex valves. Also supplied were 3750 Series pressurisation units and GLA Glycol Autofill units, along with 6800 Series IVS variable speed booster sets incorporating built-in inverters. The Armstrong variable speed pumps supplied for the project have energy efficiency advantages as well as having the ability to reduce equipment footprint and to deliver significant savings in installed cost. Traditional base mounted end suction pumps can require up to three times more floor space than the Armstrong alternatives.
16 BUILDING SERVICES & ENVIRONMENTAL ENGINEER SEPTEMBER 2011
The Armstrong pumps have a smaller footprint because they are designed to be hung as an integral component of the pipework, making it possible to install them above ground level and position other system components below them to use space more effectively.
Optimum flow
The pumps supplied for the King’s Cross project also feature Armstrong Suction Guides and Flo-Trex valves, which provide further space savings. The Suction Guide creates the optimum flow conditions at the pump inlet with a single component. This eradicates the need for the conventional Y Strainer, flanges, nuts, bolts, gaskets and suction spool piece. At the discharge outlet, the Flo-Trex combination valve carries out the functions of a check valve, throttling valve and shut-off valve with just one component. These features contribute to the pumps’ competitive installed cost. As the pumps
were pipeline-hung it was possible to eliminate the cost of inertia bases, springs, flexible pipe connectors, field grouting and alignment. The use of the Armstrong Suction Guides and FloTrex valves also offered a cost saving by reducing the number of individual components and the related assembly costs. Wayne Rose, Director - Product Solutions Group for Armstrong Integrated Limited, said: “The space-saving features of the Armstrong equipment were particularly valuable for this important project as space saved in the plant room translates into additional floor space.”
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