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Morgan Academy, Dundee

Morgan Academy, Dundee

Reconstruction of a fire-damaged A-listed landmark building in Dundee, which highlights the powerful link between building conservation and sustainable design. 

Overview

Reconstruction of a fire-damaged landmark building in Dundee, which highlights the powerful link between building conservation and sustainable design.

Morgan Academy was founded by John Morgan in 1850, and is set in the heart of the city of Dundee. Morgan’s wish was to establish an educational institution that would serve the city’s working-class community. A dispute arising over Morgan’s will meant that the building could not survive as a private venture, and it was acquired by the city in 1889 and established as a state school. The Academy – an imposing, baronial-style, A-listed building – became a familiar and much-loved city landmark.

There are many sustainable advantages in the renovation of existing buildings: the reduction of demolition and the re-use of resources both lessen environmental impact, and an old and much-loved building can be retained and given a new life.

Approach

Considered Materials

The conservation plan recommended the use of building materials such as slate, stone, timber, lime and clay-based products because of their relatively low embodied energy, and for the further sustainable value gained from being able to source them locally. Morgan Academy is a prime example of how conservation and the need to carefully match new materials to the existing building fabric has the added advantage of less impact in the manufacturing, extracting and transportation of materials. 

Rational Design

The renovation process resulted in the additions being removed from the original courtyard to provide space for a new school assembly hall. To avoid creating a potentially claustrophobic ‘enclosure’ of classrooms around this space, the project architect developed a plan that incorporated large expanses of glass in the hall roof, with extensive internal window-space overlooking the central space. Situating the hall in the courtyard also allowed for a compact building form which reduced heat loss through the building fabric.

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Renewable Energy

The design team were keen to tap into renewable energy sources, partly to offset the need to use mechanical ventilation, heating and cooling in some parts of the building. A shallow geothermal borehole installation was proposed, with a set of closed circuit alkathene pipes placed in 90-metre deep boreholes in two locations close to the main building. A heat pump acts as a heat exchange between the geothermal pipe-run and water supply at suitable temperatures. In winter, the earth’s slightly higher temperature is extracted via the heat pump, while in summer excess heat extracted from classrooms is routed back into the ground. 

The opportunity to hail Dundee as a pioneer of solar power-use encouraged the local authority to look at how photovoltaic cells (PVs) might power the geothermal installation. Although concerned by the high costs of installation and long payback period, Dundee City Council made a successful application to the Energy Saving Trust Scotland and was awarded £115,000 to the costs of installation. The photovoltaic array generates 34kw of energy at full power, and will ensure that key areas of the school will be powered from renewables.

 

Performance

Daylight and Natural Ventilation

The renewables-led servicing strategy was a response to a set of strategic design decisions to design for natural ventilation and daylight made early in the project. The decision to locate the assembly hall in the central courtyard had many advantages, not least that the external appearance and compact form of the school was retained. The atrium space and assembly hall is at the heart of the new school community. The predominantly glazed roof is designed to fill the area with light. To counteract the potential drawbacks of such an expansive glass feature in terms of glare and overheating in hot weather, the glazing is solar-reflective and motorised blinds have been incorporated. The space is mechanically ventilated, while some heat is recovered via air extraction. Although the classrooms surrounding the space feature internal windows, levels of daylight overspill have been reduced. Fire regulations prevented the opening of windows onto the courtyard from the classrooms.

Upper corridors of the school are contained centrally within the building. To introduce as much daylight into the school as possible, both as a means of reducing energy consumption and to maximise the beneficial qualities of daylight, upper corridors are lit via ‘sun pipes’ – skylights with mirrored casings that maximise light transmission by piping external light into an enclosed space.

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Mechanical Ventilation, Heating and Cooling

Because of the ventilation restrictions posed by these fire regulations, the classrooms required mechanical ventilation, heating and cooling. These internalised rooms are provided with heated or cooled air as required from roof-top plant with individual room temperature control from a ‘Spilotair’ installation. This devolved system avoided the need for a large centralised refrigeration plant. Staff are also able to set temperatures manually.

Classrooms situated around the external perimeter of the building are serviced by a simple low-pressure hot water system for heating, while ventilation is achieved simply through opening windows. This allows a good degree of user control, while being simple, cheap and effective. 

The heating and ventilation installation is characterised by a clear and logical configuration with a generous provision of space for maintenance and replacement. The basement level features a ‘racetrack’ layout for the service-runs around the internal courtyard, with boilers providing heating and hot water. A further perimeter plant room is located around the rooftop areas, making provision for the heat pump, air-supply and extract ducting. 

 

Lessons

Re-use and conservation are inherently sustainable, and compact-build forms reduce energy demand. Building services strategies need to be finely attuned to usage and if renewable energy installations are incorporated this needs to be done as an integral part of a broader strategy.

Promoting sustainable development was a major aim under the ‘Dundee Sun City’ initiative, and the restoration of Morgan Academy was intended to serve as a benchmark for the future – an educational institution that ‘practises what it preaches’. But how best to convey such a forward-thinking initiative to the school community and the wider population alike is still a challenge.

New systems of building procurement often move responsibility for design and specification of works to contractor organisations but in such special circumstances it is crucial that sustainability criteria are specified and agreed at project inception.

Renewable technologies such as those employed at Morgan Academy have high capital costs, particularly the photovoltaic installation. Special grant funding and the commitment of the local authority’s ‘Dundee Sun City’ initiative ensured that the development proceeded, but it was also important that the local authority were seen to be supporting such technologies, to influence the attitudes of businesses and the local community in favour of sustainable design. To reinforce this they agreed that a thorough assessment of the long-term benefits of the initiative should be carried out.

While sustainable design measures adopted in the renovation of Morgan Academy are praiseworthy, other projects would have to take into account the unique circumstances of the fire damage and the cultural qualities of the existing building. The use of high-cost materials and components on new-build projects could prove prohibitive. In such cases, however, other sustainability criteria can be applied – for instance, the use of low-toxicity building materials or increased use of passive solar systems.

Heat pump and PV technologies have high capital outlay, but it can be possible for local authorities to make an economic argument that specifying such technologies reduces fixed and recurring costs in their building stock. Introducing an element of renewable energy sources into a large property portfolio can also reduce the impact of the future instability in energy cost likely to happen as the UK imports more fossil fuel such as gas and coal. In the long term, renewable energy sources may lead to a much-desired certainty in cost efficiency and life-cycle analysis

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