Exergy as criteria for efficient energy systems – Maximising energy efficiency from resource to energy service, an Austrian case study

Sejkora, Christoph; Kühberger, Lisa; Radner, Fabian; Trattner, Alexander; Kienberger, Thomas

doi:10.1016/j.energy.2021.122173

Cited by 11 publications

(15 citation statements)

References 31 publications

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“…Incineration of woody biomass is only used for covering the demand at 250 • C. Heat demands at higher temperatures are covered by the incineration of renewable gases. A detailed discussion of the optimal technology mix to maximise Austria's exergy efficiency can be found here in [47].…”

Section: Energy-based Resultsmentioning

confidence: 99%

“…The exergy-based optimisation model described here for the analysis of a national energy system in currently under review by the authors of this work [47]. Further information can be found there when it is published.…”

Section: Renewable Generation/productionmentioning

confidence: 99%

“…They are also known as electrofuels [51]. The share of battery electric vehicles (BEVs) over the years [40] is multiplied by the maximum possible amount of BEV, in accordance with the required range and transport capacity [47]. In general, these assumptions can be considered as rather conservative.…”

Section: Scenario Sufficiencymentioning

confidence: 99%

“…On the one hand, this is caused by the high degree of electrification and, on the other hand, it is the consequence of the availability of other controllable consumers such as heat pumps. Flexible operation during negative residual loads of central heat pumps can help increase overall efficiency [47].…”

Section: Comparison and Explanation Of The Technical And Economic Ele...mentioning

confidence: 99%

“…Furthermore, exclusively in the scenario Energy Efficiency, the technical potential of wood gas via the gasification of woody biomass is also included. Wood gasification and wood gas utilisation enable a better exergetic utilisation of woody biomass than the typical thermal biomass utilisation for the provision of low-temperature heat such as space heating [47]. In this section, first the technical import demand (use of all technical potentials) and then the economic import demand (use of exclusively economic production) are discussed.…”

Section: Import Demand Of Renewable Gasesmentioning

confidence: 99%

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Interlinking the Renewable Electricity and Gas Sectors: A Techno-Economic Case Study for Austria

et al. 2021

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Achieving climate neutrality requires a massive transformation of current energy systems. Fossil energy sources must be replaced with renewable ones. Renewable energy sources with reasonable potential such as photovoltaics or wind power provide electricity. However, since chemical energy carriers are essential for various sectors and applications, the need for renewable gases comes more and more into focus. This paper determines the Austrian green hydrogen potential, produced exclusively from electricity surpluses. In combination with assumed sustainable methane production, the resulting renewable gas import demand is identified, based on two fully decarbonised scenarios for the investigated years 2030, 2040 and 2050. While in one scenario energy efficiency is maximised, in the other scenario significant behavioural changes are considered to reduce the total energy consumption. A techno-economic analysis is used to identify the economically reasonable national green hydrogen potential and to calculate the averaged levelised cost of hydrogen (LCOH2) for each scenario and considered year. Furthermore, roll-out curves for the necessary expansion of national electrolysis plants are presented. The results show that in 2050 about 43% of the national gas demand can be produced nationally and economically (34 TWh green hydrogen, 16 TWh sustainable methane). The resulting national hydrogen production costs are comparable to the expected import costs (including transport costs). The most important actions are the quick and extensive expansion of renewables and electrolysis plants both nationally and internationally.

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Section: Energy-based Resultsmentioning

confidence: 99%

Section: Renewable Generation/productionmentioning

confidence: 99%