SCHOOL DESIGN HVAC SERVICES Typical fi rst fl oor classroom ventilation strategy Solar control glazing
Motorised roof light linked to room temperature sensor, CO2
sensor and weather station.
FACTFILE HEREFORD SCHOOL HVAC SERVICES
Trickle ventilation Manual window openings
c2 T
CO2 sensor
Temperature sensor
Ventilation
Central roof mounted air handling units with thermal wheel heat exchanger
Perimeter radiators
feature as an educational tool. Meanwhile, the town’s Havelock
Academy, currently under construction and due to open this autumn, also shows how school design is changing to suit the needs of IT-focused learning institutions. Havelock will specialise in mathematics, computing and technology. It is proposed that all 1,100 pupils will carry their own netbook portable computer, which they will use throughout their time at the school. Thirty children in a classroom, each with their own portable computer, would ordinarily cause big heat gains that would need to be countered with a powerful ventilation system. But the netbooks will feature ‘thin client’ technology, which means that all the processing is done on a server in the school, reducing heat output from the notebooks. AECOM has avoided using air
Brumpton: ‘The head teacher was very keen that the users of the school could control their own environment, by being able to open a window.’ A simple sticker on the wall will advise users on how to get the best out of the natural ventilation system. The fi rst-fl oor classrooms are also
You can’t just be an engineer, you also have to embrace the head teacher’s vision
naturally ventilated, except for the Learning Resource Centre, which will have mixed- mode ventilation. Heat pumps will provide heating and cooling in four IT suites. Internal classrooms will have extractor ventilation. Brumpton says the ventilation strategy at Havelock draws on AECOM’s experience of working on four Sheffi eld Building Schools for the Future projects, which also featured single-
conditioning wherever possible at Havelock. The building will be star-shaped. The ground fl oor perimeter classrooms are naturally ventilated, with openable strips at the top and bottom of each window. But there won’t be any CO2 monitors to help the occupiers use the windows. Says AECOM associate director Paul
sided natural ventilation successfully. ‘Those were successful and we were keen to adopt the same strategy at Havelock,’ he says. Brumpton stresses that Havelock is in a quiet area with low background noise, making open windows feasible. ‘As an engineer, I’ve learned so much
about how schools need to operate,’ says Brumpton. ‘You can’t just be an engineer anymore, tightening nuts and bolts and coming up with the calculations. You’ve really got to embrace the head’s vision for the teaching.’
A computer- generated image showing Havelock Academy from a side elevation
Local ceiling void mounted supply and extract heat recovery units complete with low temperature hot water heater batteries and plate heat exchanger with summer bypass facility
Twin fan toilet extract systems Bifurcated kitchen extractor fan
Bifurcated fan serving food technology canopy extract
Actuated roof lights to fi rst fl oor naturally ventilated classrooms controlled by weather station
Actuated low level inlets and roof lights controlled by weather station providing natural ventilation to the agora
Cooling
Local ceiling void mounted supply and extract plate heat exchanger, heat recovery unit with integrated DX VRF heat exchangers.
Air-handling units and local heat recovery supply and extract units confi gured to maximise free cooling as permitted by external conditions
Heating
Biomass boiler. Wood pellet boiler modulating boiler with automatic ignition
Two modulating gas-fi red boilers
Low-temperature hot-water perimeter radiators to naturally ventilated classrooms. Warm air heater batteries to mechanically ventilated science and technology classrooms
Underfl oor heating serving ground and fi rst fl oor circulation spaces
Low-temperature hot-water door curtains at main entrances to provide climate separation and protection to circulation spaces heated by underfl oor heating
Ceiling void mounted supply and extract heat recovery unit with integrated DX VRF heat exchanger has been installed
www.cibsejournal.com
May 2011 CIBSE Journal
51
Page 1 |
Page 2 |
Page 3 |
Page 4 |
Page 5 |
Page 6 |
Page 7 |
Page 8 |
Page 9 |
Page 10 |
Page 11 |
Page 12 |
Page 13 |
Page 14 |
Page 15 |
Page 16 |
Page 17 |
Page 18 |
Page 19 |
Page 20 |
Page 21 |
Page 22 |
Page 23 |
Page 24 |
Page 25 |
Page 26 |
Page 27 |
Page 28 |
Page 29 |
Page 30 |
Page 31 |
Page 32 |
Page 33 |
Page 34 |
Page 35 |
Page 36 |
Page 37 |
Page 38 |
Page 39 |
Page 40 |
Page 41 |
Page 42 |
Page 43 |
Page 44 |
Page 45 |
Page 46 |
Page 47 |
Page 48 |
Page 49 |
Page 50 |
Page 51 |
Page 52 |
Page 53 |
Page 54 |
Page 55 |
Page 56 |
Page 57 |
Page 58 |
Page 59 |
Page 60 |
Page 61 |
Page 62 |
Page 63 |
Page 64 |
Page 65 |
Page 66 |
Page 67 |
Page 68 |
Page 69 |
Page 70 |
Page 71 |
Page 72 |
Page 73 |
Page 74 |
Page 75 |
Page 76 |
Page 77 |
Page 78 |
Page 79 |
Page 80 |
Page 81 |
Page 82 |
Page 83 |
Page 84