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8.5. District Heating Pipes for Low-Energy Houses by LOGSTOR
District heating is one of the most eco-friendly energy supplying ways available today. New buildings have
low energy demand and therefore innovative thinking is necessary regarding to the supply of the minor
energy quantity, which is required for room heating and domestic hot water.
In order to calculate the heat loss of a pre-insulated pipe system relatively precisely, it is necessary to
include all the parameters influencing the heat loss. For that purpose, the calculation program Calculator
was developed which takes into consideration the temperature dependent lambda value and the changes
in insulation over time (ageing).
The low energy demand of low-energy houses in combination with new types of heat exchangers with
storage tanks gives the opportunity to use smaller dimensions of service pipes. Therefore, new sizes for
house connections were needed and new LOGSTOR Twin Pipe ø14mm with PUR foam and LDPE casing was
developed. The combination of high-efficient insulation materials, gas diffusion barriers and small
dimensions of service pipes, makes it
possible, with the new service pipe, to
reduce the heat loss in a house connection
up to 70 %, compared to traditional
connections.
Figure 71. LOGSTOR Twin-Flex 14-14/110 mm district heating pipe
8.6. Development and optimization of an existing complete
wood chips fuelled downdraft staged air gasification CHP plant
by BioSynergi Proces ApS
The central process in the combined heat and power system (CHP system) converts wood chips into a
combustible producer gas. The conversion takes place in an air-staged Open Core downdraft gasifier. The
producer gas is used as a fuel in a combustion engine in couple with an electrical generator. The complete
plant is designed for automatically, unmanned operation.