Havelock Academy, Grimsby, due to open later this year, is shown at first-floor level
they do not obstruct the air flow. The main hall, dining areas and
technology areas are ventilated by central air handling units with integral heat recovery. The science classrooms and landlocked rooms within the spine of the P are ventilated by local, supply-and-extract heat recovery units, which have an integral plate heat exchanger with a summer bypass. The IT and Learning Resource Centre areas are heated and cooled by fan coil-type VRF (variable refrigerant flow) units. These allow heat to be recovered from an internal cassette when it is in cooling mode and passed to another unit where heating is needed. The school has an internal courtyard
area, or agora, with a barrel vault roof made from clear, UV-protected polycarbonate. To
prevent over-heating the agora has high and low louvres that respond to temperature and CO2 levels, although an automatic ‘weather station’ prevents the louvres opening if it is raining or too windy outside. Space heating is mostly provided by
thermostatic-valve controlled radiators. However, some of the mechanically ventilated areas are heated by warm air systems, and the circulation spaces are heated by underfloor heating. These are fed by the central boiler plant, which comprises two gas boilers of 250 kW each and one biomass boiler of 250 kW. Todd says the biomass boiler can
provide half of the total design load of the school and around 90% of the heat demand. The school has joined a public sector purchasing consortium, Yorkshire
Procurement, to source the wood pellets for the boiler. The school’s biomass boiler can modulate down to 30% of its capacity and features automatic ignition, so it doesn’t have to be left burning all night. Instead, the system can be scheduled to start up at whatever time in the morning suits the operator. ‘The feedback we have is that the system is working as intended,’ says Todd. AECOM produced the concept and
performance design at Hereford and conducted a peer review of the subsequent detailed design, which was carried out by NG Bailey. The gas, hot water and electrical systems are sub-metred, with the readings connected to the school’s Local Area Network, so the pupils can log on to see how much energy each part of the system is consuming. The school aims to use this
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CIBSE Journal May 2011
www.cibsejournal.com
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