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Thermo-Economic Analysis of Near-Surface Geothermal Energy Considering Heat and Cold Supply within a Low-Temperature District Heating Network

Title data

Kutzner, Sebastian ; Heberle, Florian ; Brüggemann, Dieter:
Thermo-Economic Analysis of Near-Surface Geothermal Energy Considering Heat and Cold Supply within a Low-Temperature District Heating Network.
In: Processes. Vol. 10 (2022) Issue 2 . - 421.
ISSN 2227-9717

Official URL: Volltext

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Project financing: Deutsche Forschungsgemeinschaft

Abstract in another language

This study evaluates low-temperature district heating (LTDH) networks with different geothermal heat sources under thermo-economic criteria. In particular, the heat and cold supply of modern neighbourhoods are taken into account in a dynamic simulation model built on the modelling language Modelica. Both horizontal and vertical ground heat exchangers (GHE) were investigated in respect to the load profiles of the consumers, depending on dimension as well as location. The selected base case represents a LTDH network near Stuttgart (Germany). The corresponding results of an annual simulation show that a horizontal GHE is suitable for pure heat supply and can reduce costs by up to 12% compared to a vertical system. This economic advantage remains when the cooling demand is considered. Subsequently, a variation of the system location was carried out. It is shown that horizontal GHEs operate more economically in northern regions, whereas vertical ones are more advantageous in regions with increased cooling demand. For both cases, possible savings of between 3.0% and 4.2% resulted from the simulations. The heating-to-cooling demand ratio was used as a first decision criteria to weigh-up between the two systems. Vertical GHEs were more economical than horizontal systems as soon as the ratio dropped below 1.5.

Further data

Item Type: Article in a journal
Refereed: Yes
Keywords: low-temperature district heating; near-surface geothermal energy; decentral heat pumps; thermo-economic analysis; transient simulation; geothermal heating and cooling
Institutions of the University: Faculties > Faculty of Engineering Science > Chair Engineering Thermodynamics and Transport Processes
Profile Fields > Emerging Fields > Energy Research and Energy Technology
Research Institutions > Research Units > Zentrum für Energietechnik - ZET
Faculties > Faculty of Engineering Science
Profile Fields
Profile Fields > Emerging Fields
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Research Institutions > Research Units
Result of work at the UBT: Yes
DDC Subjects: 600 Technology, medicine, applied sciences > 620 Engineering
Date Deposited: 24 Feb 2022 08:19
Last Modified: 23 Aug 2023 13:29