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THE INCREASING USE OF LOW TEMPERATURE WATER SYSTEMS | 3
Energy refurbishment
of buildings
Buildings heated by
low temperature
radiators systems
consume less total
energy than
underfloor heated
buildings
Improving the
energy efficiency
of older buildings is
a more effective
way of saving
more energy
In short, buildings heated by low temperature radiator
systems consume less total energy than underfloor heated
buildings, even when using heat pumps as a heat generator.
Differences of COP values are compensated by the higher
energy efficiency of the low temperature radiators.
Buildings, particularly residential buildings are currently
in a upward spiral of energy consumption. Energy used in
buildings is the biggest single energy consumption sector
in Europe. Logically our energy-saving activities should be
directed at reducing energy use in buildings. Interestingly
though, modern buildings (new or well-renovated) are not
of newer buildings built after 1982 make up 23% of the
country’s total stock, but consume only 5% of the heating
energy. In other words, improving the energy efficiency of
older buildings is a more effective way of saving more energy.
Fig.3.6
Focus on old buildings:
Buildings in figures
and in terms of energy
consumption,
Fraunhofer 2011
77% of the buildings
in Germany built
before 1982 use 95%
of heating energy.
100
80
60
40
20
0
23
77
amount of buildings
5
95
use of heating energy
built after 1982
built before 1982
46
47