Techno-economic planning and construction of cost-effective large-scale hot water thermal energy storage for Renewable District heating systems

Ochs, Fabian; Dahash, Abdulrahman; Tosatto, Alice; Janetti, Michele Bianchi

doi:10.1016/j.renene.2019.11.017

Cited by 53 publications

(25 citation statements)

References 19 publications

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“…Moreover, the same technology has been evaluated from an environmental point of view and the eco-economical prospective, by applying the life cycle assessment methodology (LCA) [6]. Water can be considered as renewable by definition and new technologies based on its use are emerging [7] [8]. For this reason this process driven by water utilization should be appealing as a renewable improvement of energy sources exploitation.…”

Section: Introductionmentioning

confidence: 99%

Effects of humidified enriched air on combustion and emissions of a diesel engine

et al. 2020

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The potential of Humidified Enriched Air (HEA) on Diesel engine combustion is investigated, by means of 3D CFD combustion simulations, on a current production 4-cylinder turbocharged Diesel engine. HEA is supposed to be obtained by water degassing operation, exploiting the different vapor-liquid equilibria of it main constituents, nitrogen and oxygen. Simulations are carried out using a customized version of the KIVA 3V code, featuring a detailed chemistry combustion mechanism. The model of the engine is previously validated through comparison with experimental data and then it is used to analyse combustion and emissions of HEA combustion in combination with late injection strategies. Numerical results demonstrate that oxygen-enriched air enhances the thermal efficiency of the engine (up to 13%) and reduces significantly soot emissions; on the other hand, in-cylinder peak pressure and NOx emissions increase. The latter can be significantly reduced by using humidified air maintaining the advantage in terms of thermal efficiency and in soot reduction, nevertheless the baseline case NOx emissions cannot be restored.

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Section: Introductionmentioning

confidence: 99%

Effects of humidified enriched air on combustion and emissions of a diesel engine

et al. 2020

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“…In this context, Ochs et al [1] examined a number of design parameters of the large-scale TES on the investment cost in a techno-economic analysis framework. Therein, the TES volumes considered are typically between 100,000 m 3 and 2,000,000 m 3 for two main types of STES: 1) tank TES and 2) pit TES.…”

Section: Literature Reviewmentioning

confidence: 99%

“…Such resources include geothermal energy, solar energy or wind energy that requires the installation of power-to-heat technologies. Besides, waste heat can be also integrated; thus, it also emerges as a key heat resource [1].…”

Section: Introductionmentioning

confidence: 99%

Techno-Economic Planning and Exergy Analysis of Large-Scale Hot-Water Tank and Pits

Dahash¹,

Ochs²,

Tosatto³

2022

Atlantis Highlights in Engineering

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Large-scale seasonal thermal energy storage (STES) substantially facilitates a full exploitation of the local renewable energy sources (e.g. geothermal, solar, waste heat) potential in renewables-based district heating systems in order to mitigate CO2 emissions and the climate change. Large-scale seasonal TES systems store energy for lengthy timescales; therefore, it is essential to properly plan these structures in order to avoid high capital cost and/or performance below expectations. The STES planning phase includes a wide list of variables such as hydrogeological conditions (e.g. soil type, groundwater existence and/or flowing), TES geometry (e.g. tanks, conical pits, pyramid stump pits), TES construction (e.g. freestanding, partially or fully buried), system characteristics (e.g. operation temperatures), liners and insulation and others. Therefore, it is crucial to strive for an optimal TES selection in which a compromise between the technical performance and the economic investment is made. This work examines the planning of large-scale TES systems by means of numerical simulations. The models used are calibrated using measured data from the pit thermal energy storage in Dronninglund (Denmark). For the techno-economic assessment, different key performance indicators are used such as: energetic efficiency, exergetic efficiency, stratification efficiency and levelized cost of stored heat (LCOS). In this context, the investigation depicts that a hybrid TES arises as a promising option that combines the advantages of both tank and shallow pit. Accordingly, hybrid LCOS deems to be the lowest among other geometries. Further, the examination reveals that a tank has better technical performance and lower LCOS than a shallow pit under the same set of boundary conditions. Considering the transition to low-temperature district heating (DH) systems, the work further investigates the influence of DH temperature on TES techno-economic performance. Not only does the lowtemperature DH lead to an increase in TES performance but it also results in lower LCOS compared to its counterpart in a DH with high-temperature.

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“…Recent Progress in District Heating with Emphasis on Low-Temperature Systems DOI: http://dx.doi.org/10.5772/intechopen.94459 aspects of cost-effective largescale seasonal thermal energy storage for LTDH systems have been studied by Ochs et al as part of the gigaTES 4 initiative [36]. However, the planning and development of seasonal thermal storage require a comprehensive study to identify the project cost.…”

Section: Introductionmentioning

confidence: 99%

Recent Progress in District Heating with Emphasis on Low-Temperature Systems

Khosravy¹

2022

Geothermal Energy

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District heating plays an important role in future sustainable energy system by integrating any available heat source, including waste heat and renewable heat sources such as geothermal or solar heat. The low-temperature district heating system is the latest generation of district heating. It was introduced less than ten years ago in adaption to the need for lower heat demand of energy-efficient buildings. The low-temperature district heating system provides an infrastructure for a higher share of renewable energy sources while reduces heat loss in pipes. Several small-scale projects were commissioned since the introduction of the technology, and many existing district heating systems are in the process of adaptation. The recent progress of low-temperature district heating systems has been discussed here. First, the fundamental knowledge that is required to understand the main advantages of a low-temperature district heating system was explained briefly. Then the most recent and important projects were discussed with emphasis on solar and geothermal district heating systems. The results of case studies show that the low-temperature solution has the lowest capital costs and has a unique position to be the primary source for building heating demand.

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Techno-economic planning and construction of cost-effective large-scale hot water thermal energy storage for Renewable District heating systems

Cited by 53 publications

References 19 publications

Effects of humidified enriched air on combustion and emissions of a diesel engine

Effects of humidified enriched air on combustion and emissions of a diesel engine

Techno-Economic Planning and Exergy Analysis of Large-Scale Hot-Water Tank and Pits

Recent Progress in District Heating with Emphasis on Low-Temperature Systems

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