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planning:building_services:heating_and_dhw:groundtubes [2024/10/24 15:41] – [2Cold local district heating in underground pipes] yaling.hsiao@passiv.deplanning:building_services:heating_and_dhw:groundtubes [2024/10/30 10:47] (current) – [See also] yaling.hsiao@passiv.de
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-===== Ground Tubes =====+====== Ground Tubes ======
  
-==== 1 Heat distribution via underground pipes – district heating in the neighborhood? ====+Author: Berthold Kaufmann 
 + 
 +===== Heat distribution via underground pipes – district heating in the neighborhood? =====
  
 The power plants that will be operated with renewable energy sources in the future, as well as heating systems in residential areas that may work with combined heat and power (CHP), will be supplied with surplus energy from the summer half-year into the winter half-year. These summer surpluses of electrical energy must therefore be stored temporarily, for example by converting PV and wind power into liquid or gaseous energy sources using electrolysis etc. ('power-to-gas'). These can then be used in the winter months in the same way as the fossil fuels natural gas and crude oil. The waste heat generated during combustion in CHP plants or fuel cells can generally already be used very well today to heat buildings and provide domestic hot water. The energy content can therefore be used almost completely: electrical energy from the generator for light, power and communication and the waste heat for heating. This will become all the more important in the future because the available budget for renewable energy sources is likely to be more limited and primary energy will therefore be significantly more expensive than it is today, especially in winter. The power plants that will be operated with renewable energy sources in the future, as well as heating systems in residential areas that may work with combined heat and power (CHP), will be supplied with surplus energy from the summer half-year into the winter half-year. These summer surpluses of electrical energy must therefore be stored temporarily, for example by converting PV and wind power into liquid or gaseous energy sources using electrolysis etc. ('power-to-gas'). These can then be used in the winter months in the same way as the fossil fuels natural gas and crude oil. The waste heat generated during combustion in CHP plants or fuel cells can generally already be used very well today to heat buildings and provide domestic hot water. The energy content can therefore be used almost completely: electrical energy from the generator for light, power and communication and the waste heat for heating. This will become all the more important in the future because the available budget for renewable energy sources is likely to be more limited and primary energy will therefore be significantly more expensive than it is today, especially in winter.
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 An improvement is achieved by shortening the network (variant 3), improving the thermal insulation of the underground pipes (variant 7) and, if applicable, increasing the density of apartments (variant 5) and reducing the feed flow temperatures (variants 2, 4, 6, 8). With all these measures combined, the efficiency in the example increases to around 80 % (variant 8). An improvement is achieved by shortening the network (variant 3), improving the thermal insulation of the underground pipes (variant 7) and, if applicable, increasing the density of apartments (variant 5) and reducing the feed flow temperatures (variants 2, 4, 6, 8). With all these measures combined, the efficiency in the example increases to around 80 % (variant 8).
  
-==== Cold local district heating in underground pipes ====+===== Cold local district heating in underground pipes =====
  
 In variants 9 and 10, the feed flow temperatures were reduced to 15 °C. As expected, this immediately drastically reduces the heat losses in the network despite standard thermal insulation. [AKKP 61 WP] In variants 9 and 10, the feed flow temperatures were reduced to 15 °C. As expected, this immediately drastically reduces the heat losses in the network despite standard thermal insulation. [AKKP 61 WP]
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 Allerdings werden sich bei diesem Konzept die Investitionskosten verschieben: anstatt eine zentrale WP oder KWK-Anlage im gesamten Nahwärmenetz muss jetzt für jedes Gebäude oder für jede Wohneinheit eine WP installiert werden.  Allerdings werden sich bei diesem Konzept die Investitionskosten verschieben: anstatt eine zentrale WP oder KWK-Anlage im gesamten Nahwärmenetz muss jetzt für jedes Gebäude oder für jede Wohneinheit eine WP installiert werden. 
  
-==== Literature ====+===== Literature ===== 
 + 
 +**[AKKP 61 WP]** B. Kaufmann, Wärmepumpen für die Altbausanierung, in Arbeitskreis Kostengünstige Passivhäuser, Protokollband 61, Serielle energetische Sanierung nach Passivhaus Prinzipien, Darmstadt, 2024 
 + 
 +**[AKKP 46 FW]** B. Kaufmann, Bewertung leitungsgebundener Energieträger: Wärmeverteilverluste von Fern-/ Nahwärmenetzen Szenarien für die optimierte Fernwärmenutzung aus KWK. In: Arbeitskreis Kostengünstige Passivhäuser, Protokollband 46, Nachhaltige Energieversorgung mit Passivhäusern, Darmstadt 2012 
 + 
 +**[Drexel 2007]** C. Drexel, Tagungsband zur Internationalen Passivhaustagung 2007 (Bregenz), Energie Institut Vorarlberg (EIV) / Passivhaus Institut, Darmstadt 2007. 
 + 
 +**[Dimplex]** https://www.dimplex.co.uk/professional/heat-pumps/ambient-temperature-network? 
 + 
 +**[districtPH]** districtPH is used to create energy balances for neighborhoods, from smaller groups of buildings up to whole districts. A specific strength of the tool is the ability to investigate the effects that different scenarios of development and retrofitting have for the building stock. The analysis takes into account grids for electricity and heat, renewable energies, electromobility and public consumers. districtPH was developed within the EU-funded Sinfonia project. http://www.sinfonia-smartcities.eu/en/ 
 + 
 +---- 
 + 
 +{{:picopen:outphit_logo_description.png?400}}{{:picopen:eu_logo_description.png?400}} 
 + 
 +---- 
 + 
 + 
 + 
 +===== See also ===== 
 + 
 +[[planning:refurbishment_with_passive_house_components]] 
 + 
 +[[planning:building_services:ventilation]] 
 + 
 +[[https://passipedia.org/eu_projects_publications#outphit_-_deep_retrofits_made_faster_cheaper_and_more_reliable|outPHit - Deep retrofits made faster, cheaper and more reliable]] 
 + 
 +Webinar: [[webinars:outphit_single-family_retrofit]]
  
planning/building_services/heating_and_dhw/groundtubes.1729777316.txt.gz · Last modified: by yaling.hsiao@passiv.de