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Ceilingsystems from Armstrong were specified for a new Pre-Operative Assessment Departmentand Surgical Admissions Suite at Bristol Royal Infirmary for theirsustainability credentials.

Armstrong’sCoolZonepassive energy-saving tiles were used alongside the manufacturer’s Ultima+range, which is the world’s first complete ceiling range to win Cradle toCradle certification, with a Tegular edge detail on a 24mm suspension grid throughoutthe £2million replacement Surgical Admissions Suite (SAS) and Pre-OperativeAssessment Department (POD).

Some 300m2of the metal CoolZone tiles incorporating Phase Change Material (PCM) whichabsorbs heat during the day and releases it at night to reduce a building’sreliance on air conditioning, feature alongside 300m2 of Ultima+mineral tiles.

The newbuilding, located on the roof of the hospital’s King Edward Building replaces aderelict structure that was carefully demolished with full scaffold protectionto the roof perimeter. In addition, small areas of refurbishment were carriedout within adjacent areas to provide links to two retained towers.

Of modularbuild, the new structure was craned into place, with a road closure and 24-hoursecurity but no hitches or incidents, over a single weekend before being fittedout to provide 15 consulting rooms, nine changing cubicles, reception, waitingareas and associated clinical support services.

The brieffrom University Hospitals Bristol NHS Foundation Trust to CMS Architects was toprovide an enlarged accommodation schedule to facilitate the client’s “Model ofcare” which streamlined two services into one department as part of a £143millioninvestment in the redevelopment of Bristol Royal Infirmary.

The conceptlayout of the building was developed to consider passive design methodsfocusing on thermal mass, orientation, and natural lighting and coolingstrategies in collaboration with end users (staff and patients) andrepresentatives from infection control, hotel services and facilitiesmanagement.

CMS seniorarchitect Paul Rogers said: “The design embraced sustainable thinking from theoutset, with the use of prefabrication construction methods, natural ventilation,maximising daylight with external louvres, and innovative PCM ceiling tiles.

“These areused throughout the building to absorb daytime solar gains and level any peaks,releasing their stored energy by night-time purge ventilation working with the naturalventilation system. This works particularly well as the building is onlyoccupied during the day.”

He added:“The project and building design champion sustainable principles. All materialsspecified were Green Guide A rated as a minimum standard. The PCM tiles enabledthe project to achieve Part L requirements without the need for cooling andthus additional renewables/photovoltaics to offset this increased energy usage.

“It isearly days but client feedback has been very positive, that the environmenteven during hot days has remained pleasant.”

Carefulconsideration was given to the elevation treatment and form of the building tomarry in with the historic King Edward Building which was built in 1902.Engagement with the local planning authority and conservation officer waspromoted from the outset to progress a solution which was affordable andsustainable while in keeping and subservient to the host building.

CMSArchitects are regular Armstrong specifiers but this was the first time they hadused the CoolZone system which was installed alongside the Ultima+tiles by specialist sub-contractor Pegasus Interiors for main contractorHalsall Construction, supplied by the Bristol branch of distributor SIGInteriors.

Paul Rogerssaid: “We were initially looking for a PCM product for walls and came acrossthe Armstrong ceiling tiles. The client had requested their standardspecification be followed but due to the fact the project was using the PCMproduct we promoted the use of a common supplier for all ceilingsystems/treatment.”

CoolZoneincorporates BASF Micronal PCM into Armstrong’s plain metal ceiling tiles. Thismaterial – microscopic polymer capsules containing a wax storage medium - isembedded in gypsum and then encased in the metal tile.

On heatingduring the day and cooling at night, the wax melts and solidifies. In this waythe internal temperature is regulated, reducing and even eliminating the needfor air conditioning. During initial tests, the CoolZone tiles delayed theonset of air conditioning by approximately four to five hours in an averageoffice. Not only can this save around 40% of the HVAC energy costs and reducepeaks in demand for air conditioning but it can also help to improve thethermal comfort for the occupants.

Thenext-generation Ultima+ range features a bright white surface, with 87% lightreflectance to help achieve 16% cost savings compared with indirect lighting.

Manufacturedwith up to 64% recycled content and 100% recyclable, it is available in threecore densities that allow specifiers to engineer sound absorption andattenuation for optimum acoustic performance – standard Ultima+giving medium density, Ultima+ OP giving low density and Ultima+dB giving high density, up to 41 dB. 

Pegasus directorRich Shore said: “The CoolZone tiles were easy to use and install and they givea great effect due to their metal finish. They complemented the Ultima+tiles very nicely.

“The wholeproject went smoothly, with all parties in the supply chain cooperating welland the technical support from Armstrong was exceptional.”

To see moreon the project go to http://bit.ly/1EzvGhR.


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