Exergoeconomic analysis of a district heating system for geothermal energy using specific exergy cost method

Alkan, Mehmet Ali; Keçebaş, Ali; Yamankaradeni̇z, Nurettin

doi:10.1016/j.energy.2013.08.017

Cited by 46 publications

(12 citation statements)

References 26 publications

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“…Investigating the operation of a district heating system supplied by geothermal heat pumps, Jensen et al [24] find that to connect the heat pumps in series can improve the performance, and the exergy efficiency of the heat production unit can achieve 50-60%. In terms of the exergoeconomic analysis, Alkan et al [25] demonstrate 6 that the heat production costs per unit exergy of a GSHP heating system decreases along with the increase of the well head temperature and reference temperature.…”

Section: Introductionmentioning

confidence: 99%

Ultra-low temperature district heating system with central heat pump and local boosters for low-heat-density area: Analyses on a real case in Denmark

Yang

Svendsen

2018

Energy

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Low temperature district heating (DH) system gives easier access to the renewable energy as heat sources and improves the heat distribution efficiency. From the exergy point of view, low DH supply temperature also better matches the exergy demand of space heating and domestic hot water. It is more beneficial to operate district heating system under lower temperature level for the heat-sparse area where the distribution losses accounts for a large proportion in the total heat supply. In this study, the actual performance of a case ultra-low temperature district heating (ULTDH) system in Denmark was investigated based on long-term measurements. The system combines the central heat pump and local boosters, while the impact of such configuration on the overall system performance was analysed. The energy, exergy and economy performances of the case system were compared to medium temperature district heating system (MTDH) and low-temperature district heating system (LTDH). The results show that the LTDH system without supplementary heating has the highest energy and exergy efficiency. While the ULTDH system has better performance compared to the

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Section: Introductionmentioning

confidence: 99%

Ultra-low temperature district heating system with central heat pump and local boosters for low-heat-density area: Analyses on a real case in Denmark

Yang

Svendsen

2018

Energy

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“…In the SPECO method, cost balance equations of each unit include the cost flow rates associated with capital amortization from an economic accounting, while fuel and product definitions and auxiliary cost equations are developed at the component level and in the most complex case considering the separate components of exergy. This approach has become the most widely accepted exergoeconomic analysis method even for complex energy systems (e.g., [57][58][59][60]) and has combined with mathematical algorithms for iterative optimization (e.g., [61][62][63]).…”

Section: Accounting Methodsmentioning

confidence: 99%

A Review of Evaluation, Optimization and Synthesis of Energy Systems: Methodology and Application to Thermal Power Plants

et al. 2018

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To reach optimal/better conceptual designs of energy systems, key design variables should be optimized/adapted with system layouts, which may contribute significantly to system improvement. Layout improvement can be proposed by combining system analysis with engineers’ judgments; however, optimal flowsheet synthesis is not trivial and can be best addressed by mathematical programming. In addition, multiple objectives are always involved for decision makers. Therefore, this paper reviews progressively the methodologies of system evaluation, optimization, and synthesis for the conceptual design of energy systems, and highlights the applications to thermal power plants, which are still supposed to play a significant role in the near future. For system evaluation, both conventional and advanced exergy-based analysis methods, including (advanced) exergoeconomics are deeply discussed and compared methodologically with recent developments. The advanced analysis is highlighted for further revealing the source, avoidability, and interactions among exergy destruction or cost of different components. For optimization and layout synthesis, after a general description of typical optimization problems and the solving methods, the superstructure-based and -free concepts are introduced and intensively compared by emphasizing the automatic generation and identification of structural alternatives. The theoretical basis of the most commonly-used multi-objective techniques and recent developments are given to offer high-quality Pareto front for decision makers, with an emphasis on evolutionary algorithms. Finally, the selected analysis and synthesis methods for layout improvement are compared and future perspectives are concluded with the emphasis on considering additional constraints for real-world designs and retrofits, possible methodology development for evaluation and synthesis, and the importance of good modeling practice.

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“…Furthermore, the visualization is Exploration and management strategies for shallow geothermal energy in residential sites Shallow geothermal energy is a resource-saving alternative to conventional heating and cooling applications in residential buildings (Haehnlein et al 2013). Hence, there is a strong increase in large-scale geothermal projects, e.g., providing heat for entire residential neighborhoods (Alkan et al 2013). Therefore, novel strategies for shallow geothermal site exploration and management are being developed to promote the sustainable thermal uses of the subsurface.…”

Section: Co2man: Visualization Of a Co 2 Sequestration Pilot Sitementioning

confidence: 99%

TESSIN VISLab—laboratory for scientific visualization

et al. 2014

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Scientific visualization is an integral part of the modeling workflow, enabling researchers to understand complex or large data sets and simulation results. A highresolution stereoscopic virtual reality (VR) environment further enhances the possibilities of visualization. Such an environment also allows collaboration in work groups including people of different backgrounds and to present results of research projects to stakeholders or the public. The requirements for the computing equipment driving the VR environment demand specialized software applications which can be run in a parallel fashion on a set of interconnected machines. Another challenge is to devise a useful data workflow from source data sets onto the display system. Therefore, we develop software applications like the OpenGeoSys Data Explorer, custom data conversion tools for established visualization packages such as ParaView and Visualization Toolkit as well as presentation and interaction techniques for 3D applications like Unity. We demonstrate our workflow by presenting visualization results for case studies from a broad range of applications. An outlook on how visualization techniques can be deeply integrated into the simulation process is given and future technical improvements such as a simplified hardware setup are outlined.

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Exergoeconomic analysis of a district heating system for geothermal energy using specific exergy cost method

Cited by 46 publications

References 26 publications

Ultra-low temperature district heating system with central heat pump and local boosters for low-heat-density area: Analyses on a real case in Denmark

Ultra-low temperature district heating system with central heat pump and local boosters for low-heat-density area: Analyses on a real case in Denmark

A Review of Evaluation, Optimization and Synthesis of Energy Systems: Methodology and Application to Thermal Power Plants

TESSIN VISLab—laboratory for scientific visualization

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