HVAC in schools
NEW BOILERS MEET CAMPUS DEMANDS
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deal Commercial Boilers has overseen the installation of its Evojet condensing pressure jet boilers at a new primary school and community facility in the Scottish Borders.
Two state-of-the-art Evojet 270kW BMS modulating boilers have been installed by Marmac Services at the new Duns Primary School, as part of an £8.6million project delivered by Scottish Borders Council, working alongside its development partner Hub South East Scotland. The school officially opened in August 2017 after work was completed on time by main contractor Graham Construction, working alongside M&E consulting engineer TUV SUD and M&E Services Installers Marmac. The project was part funded by Scottish Futures Trust (SFT). After almost 140 years in its previous building, Duns Primary School has moved to a purpose-built facility which also includes a new Berwickshire Locality Support Centre, all situated on the site of a fully refurbished former high school. With a large water content of 230l each, the Evojet pressure jet boilers will meet high demand for hot water across the extensive hub campus. Launched in 2015, the Evojet condensing range is available in 10 models with outputs from 150-1450kW for a wide range of applications. They are floor standing for applications in either single or multiple configurations, enabling the school to exploit the benefits of modulation, whilst the high water content ensures a space-saving solution with no need for upper storage vessels. The Evojet has a stainless steel heat exchanger, which was the
appropriate solution for this application because of the high water content compared to other condenser boilers. Charlie Newell, senior business development manager at Ideal Commercial Boilers, said: “The Evojet range meets demand for high water content pressure jet boilers. It offers high efficiency through its modulation capabilities, comprehensive control and a stainless steel turbulator for maximum heat transfer. “Duns Primary School also has the benefit of a cascade setup, designed
to prevent the inefficiencies of on/off cycling and ensure that the boilers meet the demand placed on it at any given time as efficiently as possible.” Brian Lofnes, director, Marmac Services, said: “This project marked the start of a close working relationship between Marmac and Ideal Commercial Boilers, which enables us to take advantage of both their product excellence and technical support. “The installation at Duns Primary School was well thought-out, expertly executed and will deliver an efficient, effective heating solution across the campus.”
Pick & mix for schools
Heating system design for schools, nurseries and colleges can present the building services engineer with many challenges. Careful consideration before selecting an appropriate heat emitter for a specific area of a building is of paramount importance to en- sure the comfort of its occupants as well as deliver- ing the most economical, efficient engineering solution for the end user
T
he well-being of students and their academic performance can be significantly affected by poor air quality within a classroom. The selection of a heat emitter that can address the problem of poor air quality, while
providing an effective, efficient heating solution, will help to increase the performance levels of the room’s occupants. Fan convectors such as those by Dunham-Bush offer an option that introduces fresh air into the building via a plenum fitted with electronic driven dampers, linked to CO2 sensors sited within the classroom. Automatic on-demand ventilation can be introduced into the room that the emitter is serving, triggered by the set point on the CO2 sensor, as required by Building Bulletin BB101. Other spaces within a building can also benefit from the use of fan convectors. School halls are generally large volume areas with intermittent usage, which
only require short periods of heating. Fan convectors offer a solution for heating large volume areas with intermittent usage over variable periods. FCV’s quick response to heating demand ensures the set temperature required will be achieved in the fastest possible time and then default to a lower set temperature once the space is vacated. The ability to infinitely modulate fan speed on these low water content units by the use of EC motors linked to BMS systems increases comfort levels in buildings and reduces energy usage. The fast response time of a fan convector eliminates lengthy heat up periods and prevents any overshoot of heating requirements, thus saving energy and reducing NOx and CO2 emissions. Other large volume spaces, such as sports halls, require additional
considerations. Whilst they may have similar intermittent usage as school halls, other factors need to be taken into account. Radiant panels are often the preferred choice for these applications as they can be installed at high level, freely suspended, ceiling mounted or fitted high upon a wall. As the panels are sited remotely from the sports’ activities taking place, there are no concerns about damage, obstruction or air movement, (for example in badminton halls), as they do not impede upon the activity. Radiant panels provide an extremely efficient system by employing radiated heat in preference to convection, as radiated heat is not diminished by the additional air changes required in these facilities. Public areas and entrances can be served by several other forms of
emitters. Warm air door curtains provide a thermal barrier to the ingress of cold air from outside and the escape of warm air to the outside. Trench
28 April 2018
www.heatingandventilating.net
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