Masterplanning Hospitals
Green
growth
A master plan aimed at doubling the size
of an English teaching hospital points to
the need for a radical shift in energy
sourcing and usage. Paul Haddlesey
looks at the challenges and options ahead
A
ddenbrooke’s Hospital in Cambridge is to In light of this, as the 2020 Vision strategy envisages
almost double in size in the next decade an increase in clinical floor area from 190,000 sq m
as part of a development plan dubbed the to around 275,000 sq m, unit emissions (kg per sq m)
2020 Vision. The aim is to develop the would have to be reduced substantially further than the
site as an international centre of excellence, bringing 26 per cent gross reduction on 1990 levels required by
together clinical care, teaching and research to form the carbon reduction strategy.
the Cambridge Biomedical Campus on the site. The overall energy efficiency of the estate would
The development plan has a strong focus on therefore have to increase by 50 per cent by 2020 –
sustainability, according to Cambridge University implying a drop from 151 kg per sq m to 77 kg per
Hospitals Trust, which runs Addenbrooke’s and sq m. Given that it will be difficult to substantially
other healthcare facilities on the site. Faced with firm reduce consumption in existing parts of the estate,
targets for cutting carbon emissions, the trust regards new buildings will have to be designed to emit very
sustainable development as a must, particularly for the little carbon dioxide. “Achieving this target will require
new buildings. a radical change in the way that the trust uses and
AECOM (formerly Faber Maunsell) is providing procures energy,” McKenzie says.
engineering consultancy services for the master plan. “With priority given to passive means of heating,
Its director of building engineering, Carl McKenzie, cooling and lighting, new and refurbished buildings
says the plan provides an ideal opportunity to set can be as intrinsically energy-efficient as possible, with
an overall framework for the trust’s continuing energy use not exceeding 35 to 55 GJ/100m3 in new
sustainability initiatives – in line with the NHS carbon buildings and 55 to 65 GJ/100m3 in existing buildings.
reduction strategy as well as national, regional and local This may mean redevelopment of the most energy-
sustainability requirements. inefficient parts of the campus,” he adds.
The vision for 2020 relates to the projected date for Consequently, the intention is that the entire
controlled development of facilities on the site. Full campus may be supplied with low-carbon forms of
Achieving this
development is expected to take until 2040. heat, cooling and electricity such as combined heat
and power (CHP), and that all new buildings will
target will require
Carbon reduction make use of district energy, eventually leading to the
a radical change
Carbon dioxide emissions per unit of floor area at entire site being served by low carbon energy. While all
in the way that
the trust have fluctuated over the previous five years. technologies will be evaluated – including wind power,
In 2008, at 151 kg per sq m, emissions were close to ground source heat pumps and biomass heating –
the trust uses
typical practice for a teaching hospital within the health large-scale renewable forms of energy such as solar
and procures
service. However, targets set within the NHS carbon thermal and photovoltaics may be introduced to the
energy. – Carl
reduction strategy relate to gross emissions, and these site in phases.
have risen over the past five years, principally due to It is also recognised that the trust’s carbon emissions
McKenzie
increases in floor area. are not restricted to the operation of its buildings –
46 CIBSE Journal June 2009 www.cibsejournal.com
CIBSEjun09 pp46-48 hospitals.indd 46 29/5/09 12:25:18
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