SCHOOL DESIGN HVAC SERVICES GOING FOR
Hereford Technology School, Grimsby, is orientated to reduce heating in IT areas
it
Two new technology schools set a challenge for engineers faced with complex heating and ventilation needs. Mark Jansen reports
T
www.cibsejournal.com
wo specialist technology schools in the same town, both engineered by AECOM, set a challenge for the consultancy when it came
to specifying heating and ventilation for schools with high heat-generation from the onsite IT services. Moreover, these HVAC services also had to be geared towards the preferences of the individual school’s differing requirements. The Hereford and Havelock schools in
Grimsby have both been designed to the BREEAM Very Good standard. Opened in October 2010 to accommodate 900 pupils, Hereford Technology School has a P-shaped design that has been orientated so that the high-heat IT areas are located on
May 2011 CIBSE Journal
the north façade, to reduce the solar gains and cooling loads of these areas. The science and music classrooms,
which are also mechanically ventilated because of their high-heat activities, have been located on the ground floor, to enable the general-curriculum classrooms to be grouped on the first floor, along the spine of the P. These are naturally ventilated by manually-operated, single-sided windows, which open at the top and bottom (see Figure 1). Around 45% of the building area is naturally ventilated, according to AECOM principal engineer Colin Todd. The classrooms also feature electronically
controlled roof lights for more daylight, linked to temperature and CO2 sensors within the classrooms. The system provides a purge facility during summer periods and enhances the natural ventilation by enabling cross-flow ventilation. The roof lights can also enable overnight cooling. Todd says the roof-light controls have
been adjusted since the school opened to prevent them from opening when the external temperature is below 16 degrees. The roof lights were opening in response to excessive CO2 in the classrooms, but this led to excessive heat loss in cold weather. ‘If the CO2 has been building up, it might be that they haven’t been using the windows properly,’ notes Todd The naturally ventilated classrooms are
mostly orientated east to west, making use of beneficial solar gains. The sun’s glare is mitigated by individual blinds on each of the three panes that make up a window, so
49
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