Chilled Beams 31
Mastering energy efficiency in further education buildings
THE CARBON TRUST estimates energy costs for the further and higher education sector to be around £400m a year. In addition to the pressure exerted on education budgets, this represents an environmental impact of around 3.1m
tonnes of CO2 emissions annually. Furthermore, this demand on budgets is expected to increase. Student numbers in further and higher education have increased by 44% over the past ten years, The Carbon Trust advises.
In addition, colleges and universities are experiencing the same increases in demand for cooling that are being addressed in commercial buildings, relating to increasing investment in IT capability.
Design and usage patterns for educational buildings present particular challenges for energy efficiency. Levels of occupancy around the site can vary significantly throughout the day, and across the academic term.
Zones such as libraries and IT centres may have extended opening hours, offering students the opportunity to study 24 hours a day, seven days a week. In addition, many educational buildings provide facilities for their local communities in the evenings, weekends and outside term-time.
Despite these challenges, however, The Carbon Trust argues that it is perfectly feasible for energy consumption (and carbon emissions) to be reduced by around 20% through better housekeeping and low- cost upgrades.
Perhaps more crucial however, is the ability to minimise such running costs from the very outset. Effective selection of HVAC components, and intelligent system design, can deliver savings by providing solutions to the specific challenges that these types of buildings present.
A recent project to create a new further education facility in the north of England, for example, installed Trox chilled beams and flow rate controllers. These will continue to deliver energy and cost savings throughout their lifetimes to help the college achieve its sustainability objectives. The £22m project to create the Newcastle Sixth Form College has provided a state-of-the-art world-class learning environment. The 11,000sqm building is the only dedicated sixth form college in the city of Newcastle. Designed specifically to meet the needs of 16–18 year old students, it incorporates specialist facilities including dance and drama studios, science laboratories and art/design workshops in addition to large social spaces such as a bistro and internet café. Achieving the optimum indoor environment for learning was a key requirement for the new college. Equally important was the energy efficiency of the building, which has been designed with a number of sustainability features, including a ‘green roof’.
A key challenge was how best to cater for widely differing occupancy levels in zones across the site throughout the day. Optimum comfort conditions for students and staff needed to be maintained whilst ensuring that the HVAC system could adjust to match demand to prevent wasted energy.
The HVAC products supplied to meet the demanding requirements included Trox Multi Service Chilled Beams (MSCBs) and variable volume flow rate controllers. The MSCB’s are based on the energy- efficient air-water technology of the popular Trox model DID632 active chilled beam.
These units are ideally suited to areas with high cooling loads, combining the aerodynamic properties of ceiling diffusers
with the energy benefits of load dissipation using water. They are suitable for both recessed and exposed installations in new buildings and for the refurbishment of existing buildings with clear room heights between 2.6m and 4m.
The chilled beams installed at Newcastle Sixth Form College supply heating, cooling and ventilation throughout the building as well as incorporating lighting. As the units are extremely easy to maintain and do not require cleaning they offer significant benefits for the demands of a busy academic site such as this.
In addition, Trox variable air volume flow rate controllers have been installed to ensure that energy usage can ramp up and reduce down in line with changing occupancy levels in each zone. The products supplied are Trox TVR and RN Models. The Trox type TVR is a circular flow rate controller for variable supply or extract air, suitable for almost all control, regulation and shut-off tasks in room air conditioning systems.
The unit incorporates factory-fitted and tested mechanical and electronic components, and contains an averaging differential pressure sensor for air flow measurement, and a control damper. The control damper, with plastic seal, complies (when closed) with the air tightness requirements of EN 1751. The flow rate control is a closed circuit system with external power supply.
The Trox type RN is a mechanical automatic controller for constant volume flow systems which operates without external energy. Volume flows are set with an external pointer.
In conclusion, the products selected for the college will help to reduce the site’s running costs and carbon impact, whilst ensuring that it continues to provide the ideal environment for learning.
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ACR News February 2014
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