A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Energy geocomposites for tunnels
Thermo-active ground structures (energy foundations, retaining walls, tunnels, etc.), but also energy wells are a promising innovation regarding sustainable and clean energy consumption. A significant advantage of such systems is that they are installed within elements that are already needed for statical/structural or geotechnical reasons. Hence, no separate/additional structural or hydraulic measures are required. Foundations, walls (below and above ground) or tunnel linings can be used directly for the installation of absorber pipes for heat exchange. Energy tunnels using geosynthetics fitted with absorber pipes are a key improvement over the conventional geothermal methods like (deep) borehole heat exchangers or near-surface earth collector systems. Comparative large scale tests and site experience have shown that composites, consisting of non woven geotextiles fitted with absorber pipes provide the best results. Usually, a temperature difference of only T = 2 deg C between absorber fluid inflow and returnflow from the primary circuit is sufficient for an economical operation of the energy system. Consequently, such geothermal systems represent low temperature systems. Experience has shown, that the electricity required for operating the entire system commonly varies between 20 to 30% of the total energy output. If no heat pump is necessary (e.g. for free cooling) this value drops to 1 to 3% for merely operating a circulation pump.
Energy geocomposites for tunnels
Thermo-active ground structures (energy foundations, retaining walls, tunnels, etc.), but also energy wells are a promising innovation regarding sustainable and clean energy consumption. A significant advantage of such systems is that they are installed within elements that are already needed for statical/structural or geotechnical reasons. Hence, no separate/additional structural or hydraulic measures are required. Foundations, walls (below and above ground) or tunnel linings can be used directly for the installation of absorber pipes for heat exchange. Energy tunnels using geosynthetics fitted with absorber pipes are a key improvement over the conventional geothermal methods like (deep) borehole heat exchangers or near-surface earth collector systems. Comparative large scale tests and site experience have shown that composites, consisting of non woven geotextiles fitted with absorber pipes provide the best results. Usually, a temperature difference of only T = 2 deg C between absorber fluid inflow and returnflow from the primary circuit is sufficient for an economical operation of the energy system. Consequently, such geothermal systems represent low temperature systems. Experience has shown, that the electricity required for operating the entire system commonly varies between 20 to 30% of the total energy output. If no heat pump is necessary (e.g. for free cooling) this value drops to 1 to 3% for merely operating a circulation pump.
Energy geocomposites for tunnels
Verbundkonstruktionen für die Erdwärmegewinnung für Tunnel
Brandl, H. (author) / Adam, D. (author) / Markiewicz, R. (author)
2006
6 Seiten, 11 Bilder, 5 Quellen
Conference paper
Storage medium
English
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