Meeting high energy targets
The hospital’s achievement of Gold in the Swedish energy standard was remarkable, considering the high-energy demands. Locating ventilation units directly above the operating department to ensure maximum energy-efficiency while delivering pure, cool air, was one of WSP’s contributions towards the Gold award. Others included the installation of solar panels across the whole roof area apart from the space occupied by the helipad. This is primarily used for hot water and for heating the swimming pool. “We prioritised energy-efficiency in the design of the lighting control system and selection of luminaires, as well as transformers and UPS systems,” adds Marcus Frost. “The lifts are also designed to recover energy when descending.”
Flexibility now and for the future
The nursing staff had adopted a new way of working to increase their contact with the children, as Monica Johansson explains; “The staff wanted to work in smaller, self-contained units, each with a nurses’ station, team room and documentation located close to the patients, rather than the large, central administration room they had previously occupied.” This required replicating the systems such as IT and telecommunications across all the nurses stations but also demanded a high level of flexibility. “We learned that there may be occasions when nurses’ stations might be combined, for example to have one single station on a floor rather than several,” Ulf Larsson says. “This meant systems such as nurse call had to be capable of operating as individual units or all talking together as a single unit.”
In the infection ward, the hospital wanted rooms where pressurisation could be changed depending on whether the occupants had infections or needed protection from infection. “This is not easy from an engineering point of view,” states Erwin Spijker. “Our solution was to install a sluice between the room and the corridor to change the room pressure from positive to negative.”
In terms of providing future-ready design, Patrik Holmquist predicts; “It’s possible that in the next 50 years, higher levels of, say, heating and cooling may be required. We have installed over-sized ducts to accommodate future changes.”
Robust systems that cannot fail
As an emergency hospital, one of the greatest challenges was to prevent any of the systems from failing. The mechanical solution was to install three air handling units, so if one breaks down or requires maintenance, the others can handle the volume. Similarly, with the power supply, dual systems ensure one can take over if another fails.
Complexities handled by BIM
Due to the complexity of the project and the need to communicate design changes to the whole team as it progressed, high levels of detailed coordination were required from the outset between the many different services in the building. “When we started the project in 2010 we knew there would be changes as it went along,” says Patrik. “For example, the decision to include a sterilisation department was taken relatively late and we had already done a lot of the design. To fit it in, the basement had to be lowered, then all the shafts had to be changed.” In addition, the medical equipment, which can pose significant demands on the building systems, would not be procured till very late in the programme.
In order to manage all the different components of the building, WSP created a BIM model at the start of the project. As it has developed the model has incorporated every part of the hospital in the minutest detail. “This was essential for coordinating the services in the equipment floors and describing to the contractor in what sequence the electrical and mechanical services should be installed,” says Frost, “Or dealing with the many installations in the ceilings, such as sprinklers, medical gasses and all the electricals.”
The BIM model has now been passed over to the client for the continuing management and maintenance of the building.