Test rapportmall SCALA1 - Svensk Fjärrvärme

Svensk Fjärrvärme AB | Januari 2004
Summary – District Heating in Single Family Houses.
Fjärrrvärme till småhus - Litteraturstudie 2003 | Värmegles 2003:2
The study compiles relevant Swedish and international research with regard to district
heating in single family houses. It surveys relevant research and shows what conclusions
can be drawn from this research. Areas where little research has been conducted are also
identified. The report is part of the Swedish program District Heating in Low Density
Areas showing areas where further research is needed.
The compilation warrants the following conclusions:
• Expansion of district heating in single family houses has been possible in countries
outside off Sweden, e.g. Denmark, without specific low cost technical solutions. This
is due to favourable energy political conditions.
• The accounted costs related to construction differ considerably between different
areas of single family houses.
• Costs related to grounding and building represent a considerable high part of the
total costs related to distribution pipes.
• Continuity of the building process reduces costs relating to grounding and building
of distribution pipes.
• Several different professional careers are involved in the building process, which have
a negative impact on the continuity.
• Cold installation of district heating pipes leads to continuity in the building process
without lowering of the standards, and ought therefore be used when connecting
single family houses.
• Reuse of excavated materials also lead to continuity without lowering of the
standards, and ought therefore be used when connecting single family houses. When
cold installation is utilized, excavated materials should be avoided in bends.
• District heating substations in single family houses ought to be coupled in parallel.
• Distribution heat losses are high in areas with single family houses compared to areas
with apartment blocks.
• The reduction of heat losses is considerable when utilizing double pipes instead of
single pipes. Hence, double pipes ought to be used when connecting single family
houses.
• High heat losses during summer time cause problems in securing the domestic hot
water temperature, which must be solved in a quality guaranteed way.
• The total cost related to the connection of a single family house is strongly
dependant on the number of connected houses in the project. Hence, there is a
margin to invest in sales to raise the number of connected houses.
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