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OffiCe Case study cibse AwArd winner The building’s predicted energy use has dropped to a little over the Passivhaus maximum limit allowed, but certification was still awarded prOjeCt team ClienT: Powys County Council ArChiTeCT: JPW Construction ConTrACTor: C Sneade Ltd Building serviCes engineers: Barry Gwynnett & Adrian Tester eCologisT: Middlemarch Ecology BreeAM Assessor: Gordon Brown 40 maximum of 26C or on manual boost. In winter, the additional heat from the server room is useful in keeping the building’s internal temperature above 20C. Additional heating is generated by a 24 kW gas-fired low-NOx boiler and radiators. The building’s actual heating load was calculated at a mere 4.8 kW but the M&E contractor, who had not worked on a similar scheme before, was reluctant to fit a smaller boiler so its minimum output of 9 kW is twice what is needed. Certification After squeezing every last energy saving out of the building, its predicted energy use dropped to 144 kWh/sq m/yr. This figure was still 24 kWh/sq m/ yr over the Passivhaus maximum, but the Institut certified the building because the computer servers supply other buildings and because Williamson had done everything possible to reduce the loads. One issue the project did highlight was the problem of framework agreements, particularly where IT is concerned on this project. JPW Associates sourced the scheme’s Passivhaus-approved components from the UK and from abroad. ‘A major issue appears to be that councils are locked into framework agreements involving conventional technologies because their maintenance and procurement officers are reluctant or unable to change suppliers quickly,’ says Williamson. And when new products are sourced, an allowance has to be included in the maintenance team’s training budget. Powys County Council says it is happy with the scheme. Handover of the building was simplified through the use of the BSRIA/Usable Building Trust’s Soft Landings Framework. In fact, Soft Landings was so successful that JWC Associates has persuaded the council to adopt the framework on all of its new-build projects from now on. The building cost £1,784/sq m including the PVs and biodiverse roof, which compares well with benchmark cost from BRE and Faithfull + Gould for a BREEAM Excellent secondary school of £1,789 to £1,856/sq m. ‘We didn’t experience a cost uplift for the scheme,’ says Willamson. To cap it all, the scheme obtained a BREEAM (Offices 2006) score of 84.43%, the highest in Wales at the time, and making it the first building in the world to achieve both Passivhaus and BREEAM certification simultaneously. Councils are locked into framework agreements involving conventional technologies because their maintenance and procurement officers are reluctant or unable to change suppliers quickly CIBSE Journal April 2011 www.cibsejournal.com
Made in Britain for the electrical contractors of Britain Marco Cable Management is proud to introduce the latest ELITE Range, marking the next generation of trunking systems available, further enhancing the company’s reputation as the leading British Manufacturer of cable management. Available in three sizes, this highly durable system holds great aesthetic and practical appeal for a broad range of applications, and is designed for use in power and high density structured cabling systems, including: CAT5E, CAT6, Shielded, CAT7 and the new CAT6A 10 gig solution. Elite by name, Elite by nature, Elite by Marco. For further information 01248 725772 RANGE N o 1 B R I T I S H W I R E T R AY M A N U FA C T U R E R www.marcocableman.co.uk email: sales@marcocableman.co.uk www.cibsejournal.com April 2011 CIBSE Journal 41
Page 1 and 2: www.cibsejournal.com CARBON CHAMPIO
Page 3 and 4: Contents News 6 News Green body bla
Page 5 and 6: www.cibsejournal.com Editorial Edit
Page 7 and 8: Key questions remain over RHI ● R
Page 9 and 10: 72% off. News from the 52-storey Ne
Page 11 and 12: Building tenants ‘should be requi
Page 13 and 14: Boiling filtered water, instantly.
Page 15 and 16: Bursary supports public health engi
Page 17 and 18: The FLEET FLEET Vertical 26 models
Page 19 and 20: In a session looking at the future
Page 21 and 22: During a session on transforming th
Page 23 and 24: opinion Your views from across the
Page 25 and 26: Traditional quick-response or mixed
Page 27 and 28: IDEAL COMMERCIAL HEATING’S LATEST
Page 29 and 30: IntervIew PAtrick Bellew, Atelier t
Page 31 and 32: High performance macerating pump, p
Page 33 and 34: mass and fl uids. By the third year
Page 35 and 36: The brief for Powys County Council
Page 37 and 38: mild climate, annual solar gains te
Page 39: LIFE SUPPORT for energy efficient a
Page 43 and 44: Clients are increasingly demanding
Page 45 and 46: Figure 1: ASHRAE’s Thermal Guidel
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Page 49 and 50: ZoNING foR ENERGy www.cibsejournal.
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Page 53 and 54: Professional development The CIBSE
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