Urban and Regional Planning adopting RES - Sitra

Making Cities Energy Efficient
Figure 18: Greenwatt Way development, Slough, UK
The development is equipped with a range of renewable energy technologies,
including ground source and air source heat pumps, biomass boiler, and solar
thermal panels. Heat is distributed to the dwellings through a pre-insulated
twin-pipe mini-district heating system. The dwellings are also equipped with
mechanical ventilation heat recovery.
At the heart of the system is a carefully configured 8m 3 stratifying thermal
store with connections devised to get the best out of the system. This results
in much greater system flexibility and higher efficiency of renewable heating
plant operation. Instead of running the plant when there is a heat demand,
the thermal store enables plant to run when it is most efficient to do so,
(eg during the day for the solar thermal, and during the afternoon for the
sir source heat pump). In particular, the store is the key to obtaining high
efficiency performance of the heat pumps, and the system as a whole is
a good example of combining a heat network with heat pumps.
Figure 19:
Effective thermal storage
is at the heart of
the Greenwatt Way system
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