Identifying key locations for shallow geothermal use in Vienna

Tissen, Carolin; Menberg, Kathrin; Benz, Susanne A.; Bayer, Peter; Steiner, Cornelia; Götzl, Gregor; Blum, Philipp

doi:10.1016/j.renene.2020.11.024

Cited by 31 publications

(12 citation statements)

References 44 publications

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“…Supplementary Fig. 4 further compares our results to existing studies quantifying both heating demand and heat input 14 , 15 , 19 , 20 , 37 . All of these are focused on larger cities and hence have high heating demands.…”

Section: Resultsmentioning

confidence: 69%

“…Assuming energy extraction is focused on the groundwater table depth, this balance is achieved when the extraction rate is equivalent to the sum of conductive heat fluxes between the groundwater table and the natural and built environment at the surface. These fluxes have previously been determined for selected cities 14 , 19 , 36 , 37 . In three of these studies local infrastructure such as district heating networks and subsurface parking garages dominate on the smaller scale.…”

Section: Resultsmentioning

confidence: 99%

“…While less ubiquitous, even a single component of buried infrastructure can elevate ambient ground temperatures by several degrees Celsius 18 . Despite widespread subsurface thermal pollution, combining underground infrastructure with shallow geothermal energy systems to recycle their waste heat is far from widespread, and while recycling the accumulated heat of urban (or even rural) settlements has been studied for selected locations 19 , 20 , its global potential is unclear.…”

Section: Introductionmentioning

confidence: 99%

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Shallow subsurface heat recycling is a sustainable global space heating alternative

et al. 2022

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Despite the global interest in green energy alternatives, little attention has focused on the large-scale viability of recycling the ground heat accumulated due to urbanization, industrialization and climate change. Here we show this theoretical heat potential at a multi-continental scale by first leveraging datasets of groundwater temperature and lithology to assess the distribution of subsurface thermal pollution. We then evaluate subsurface heat recycling for three scenarios: a status quo scenario representing present-day accumulated heat, a recycled scenario with ground temperatures returned to background values, and a climate change scenario representing projected warming impacts. Our analyses reveal that over 50% of sites show recyclable underground heat pollution in the status quo, 25% of locations would be feasible for long-term heat recycling for the recycled scenario, and at least 83% for the climate change scenario. Results highlight that subsurface heat recycling warrants consideration in the move to a low-carbon economy in a warmer world.

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Section: Resultsmentioning

confidence: 69%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Shallow subsurface heat recycling is a sustainable global space heating alternative

et al. 2022

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“…Tissen et al [152] analyzed different characteristics of a particular location (Vienna, Austria) to identify the most appropriate sites for shallow geothermal use. In particular, they mapped the anthropogenic heat flux into the urban subsurface, the technical geothermal potential (calculated as in [151]), the sustainable potential, the heat supply rate, and the existing heating infrastructure to identify the most attractive locations for installing a GSHP system; furthermore, the authors calculate all these indicators for both configurations of the GSHP system (open-and closed-loop).…”

Section: Site and Locationsmentioning

confidence: 99%

Sustainability of Shallow Geothermal Energy for Building Air-Conditioning

2021

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Geothermal heat pumps have a widespread diffusion as they are able to deliver relatively higher energy output than other systems for building air-conditioning. The exploitation of low-enthalpy geothermal energy, however, presents crucial sustainability issues. This review investigates the primary forms of the environmental impact of geothermal heat pumps and the strategies for their mitigation. As life-cycle analyses shows that the highest impacts arise from installation and operation stages, most optimization studies focus on system thermodynamics, aiming at maximizing the energy performance via the optimization in the design of the different components interacting with the ground and serviced building. There are environmental studies of great relevance that investigate how the climate and ground properties affect the system sustainability and map the most suitable location for geothermal exploitation. Based on this review, ground-source heat pumps are a promising technology for the decarbonization of the building sector. However, a sustainable design of such systems is more complex than conventional air-conditioning systems, and it needs a holistic and multi-disciplinary approach to include the broad environmental boundaries to fully understand the environmental consequences of their operation.

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“…Decarbonizing the heating sector is important for reducing CO 2 emissions. In Vienna, around 28% of the total CO 2 emissions are caused by the energy supply for buildings [13] and one of the most promising environmentally friendly technologies because of the potential of geothermal energy. In the last 15 years, the heating sector in Vienna has been moving towards more renewable energy sources with an increase of 34% in renewable energies.…”

Section: Proposed Interventions For Retrofitmentioning

confidence: 99%

Energy Efficiency Measures Applied to Heritage Retrofit Buildings: A Simulated Student Housing Case Study in Vienna

2021

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One pavilion was selected for deep retrofitting from the Otto Wagner area situated in the west of Vienna. The retrofitting process involves sustainable and energy-efficient construction to improve the energy performance and energy production potential of the building while preserving the cultural heritage and significance. This four-story pavilion was re-designed according to the proposed regulations of a net positive energy university building to become a student residence. Architectural, building envelope, and engineering interventions along with various changes were simulated through the Sefaira tool in the SketchUp model. These included: optimization of the U-values of the roof, walls, and floor; the addition of different layers of sustainable energy-efficient insulation materials to decrease the overall energy demand. The specific energy demands for heating, cooling, and lighting were decreased in the proposed model to reduce the total energy use intensity from 248.9 kWh/(m2 year) to 54.3 kWh/(m2 year) resulting in a 78.2% reduction. The main goal of this study is to try and achieve a net positive energy status building as part of the Otto Wagner area by improving the building envelope and integrating renewable energies. A total of 22.5% of the annual energy consumption was generated by the designed PV system. The selected building achieved the passive house standards in Austria by optimizing the energy performance with the proposed energy efficiency measures.

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Identifying key locations for shallow geothermal use in Vienna

Cited by 31 publications

References 44 publications

Shallow subsurface heat recycling is a sustainable global space heating alternative

Shallow subsurface heat recycling is a sustainable global space heating alternative

Sustainability of Shallow Geothermal Energy for Building Air-Conditioning

Energy Efficiency Measures Applied to Heritage Retrofit Buildings: A Simulated Student Housing Case Study in Vienna

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