SCHOOL MAINTENANCE
difficult to access and restricted in space. This in turn reduces installation time so there is minimal disruption to staff and pupils.
Integrating new boilers with pre-existing pipework can affect the operation and efficiency of any new heating appliances, but this can be easily avoided with the addition of a plate heat exchanger. This provides two elements of protection by separating old and new systems allowing them to work efficiently together.
Royal Grammar School Worcester
Heating overhaul for the sixth oldest school in the world
This is exactly what happened at the Royal Grammar School Worcester, which after suffering several legacy boiler failures, required a reliable and efficient heating solution across its seven plant rooms.
The heritage of the school meant there were certain challenges when incorporating energy efficient technologies within buildings dating back as far as the 19th century. Having opted to enhance its sustainability credentials and replace a poor performing heating system, the school needed to tackle the integration of new boilers across its estate while using its pre-existing pipework. As an added complication, the replacement of the aged heating boilers and systems needed to be completed over the six- week long summer holidays before term time commenced.
Many of the existing boilers were legacy boilers over 15 years old so would be costly to repair, if they could be restored at all, and were not in line with the school’s ambition to improve energy efficiency and future proof its estate. Overall, it was decided that a total of 21 high-efficiency condensing boilers would be installed across seven critical locations, with each plant room presenting its own unique challenges. Bosch Commercial and Industrial
recommended its GB162 boiler as the range of outputs available and the option to cascade meant that the school could cater for different heat demands across different areas of the site. With net efficiencies of up to 110% and NOx emissions of less than 40mg/kWh, the GB162 range provides clean, low-carbon heating and hot water, with the ability to modulate down to as little as 2.5 per cent of the total output. Due to the boilers being fitted in the summer holidays, the school has already experienced its first winter with the new system in place and has seen improved control. With plans to replace other legacy equipment on site, upgrade to solar technology, LED lighting and secondary glazing, and to improve insulation, the school is expecting significant energy savings in the long term.
Coping with fluctuating demand With schools roughly shut for 12 weeks
Upgrading a system needn’t be as intrusive as you might expect 28
www.education-today.co.uk May 2017
throughout the year, it can be difficult for school leaders to ensure they have a heating system in place that caters for fluctuating demand for hot water while a school is open and a significant drop in demand outside of term time. For example, showers for PE lessons and after-school sport, along with the wash-down of kitchen equipment, plates and cutlery after lunch, can cause dramatic peaks in the amount of hot water required. This rise and fall in demand can take its toll on older heating systems, which can struggle to cope and bring costs through the roof. A continuous flow hot water system is ideal for coping with these peaks in demand, providing instantaneous hot water at a set temperature to ensure regulations are adhered to and only using energy when hot water is required to maximise efficiency. Providing heating and hot water via two separate systems will ensure than any peaks in demand for hot water can be easily catered for. This continuous supply of hot water is perfect for schools with cafeterias, bathrooms and changing rooms with showers that can all demand hot water at the same time. What’s more, the instantaneous water heating technology frees the need for a storage cylinder,
which saves space, reduces energy loss, and lowers the risk of Legionella contamination. The condensing technology also allows for greater energy efficiency of up to 105% resulting in significant energy savings.
The water heaters can be installed as single units or in a cascade of up to 12 units to provide a combined flow rate of up to 247 ltrs/min. This makes them ideal for schools which can have surges in demand for domestic hot water depending on the occupancy of the building. With energy saving a major objective for schools and pressure on budgets increasing, condensing boilers and a continuous flow hot water system could be the ultimate partnership to ensure a school can cater to demand, enhance its energy efficiency credentials and ultimately, stay open whilst improving the learning environment for students and staff.
For more information on Bosch Commercial and Industrial and its dedicated offering for the education sector, visit
www.bosch-
industrial.co.uk. Alternatively, follow Bosch Commercial and Industrial on Twitter (@BoschHeating_UK) and LinkedIn (Bosch Commercial and Industrial UK).
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