The future role of energy geostructures in fifth generation district heating and cooling networks

Meibodi, Saleh Salavati; Loveridge, Fleur

doi:10.1016/j.energy.2021.122481

Cited by 45 publications

(5 citation statements)

References 110 publications

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“…One sort of vertical geothermal system utilized at shorter depths (10-30 m) is called an "energy pile," and it has a bigger bridge than a traditional vertical system. Energy piles serve dual structural and energy purposes, and they offer a wide range of possible applications in the 5GDHC and NZEB [73]. Four plans for geothermal facilities with energy heaps [74], along with a number of numerical and analytical methods appropriate for simulations of energy heaps, have been discussed.…”

Section: Advancements In Technology For Geothermal Resourcesmentioning

confidence: 99%

Technological Advancements and Challenges of Geothermal Energy Systems: A Comprehensive Review

et al. 2022

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Geothermal is a renewable energy source, but this is not as often seen as other renewable energy sources, such as solar, wind, hydro, etc. Several applications could be implemented through geothermal energy, and heating & cooling systems are one of them. Because of the limits of technology, it is hard to improve cooling systems as an application. To address long-term sustainable space heating and cooling, it is imperative to develop geothermal technology. It is known as the oldest, most flexible, most adaptable, and most prevalent approach toward using renewable energy. Therefore, this review has reviewed the global development and challenges of geothermal energy for cooling systems. There are large reserves of geothermal energy available around the world, and numerous scholars have emphasized its importance, but due to a lack of knowledge, no operational work has been done in using these systems for cooling up to this point. This review paper examines globally available geothermal energy sources and technologies for environmentally friendly and sustainable cooling supplies. Finally, the benefits and challenges of geothermal systems for cooling are outlined to promote local, regional, and global investment in utilizing these resources for cooling.

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Section: Advancements In Technology For Geothermal Resourcesmentioning

confidence: 99%

Technological Advancements and Challenges of Geothermal Energy Systems: A Comprehensive Review

et al. 2022

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“…From an energy point of view, the basic operational principles of energy piles and other energy geo‐structures are well known, and their adoption has been growing almost exponentially over the last two decades, due to their environmentally friendly features. Several review works on this topic are available in the literature 2–10 …”

Section: Introductionmentioning

confidence: 99%

“…Several review works on this topic are available in the literature. [2][3][4][5][6][7][8][9][10] From the mechanical point of view, energy piles are subjected to cyclic thermally induced internal forces that arise due to the interaction with the surrounding soil, and that add to the mechanical load transferred by the structure. This can significantly change the performance of the soil/foundation system and may have adverse effects on the serviceability of the supported structure.…”

mentioning

confidence: 99%

Numerical analysis of energy piles in a hypoplastic soft clay under cyclic thermal loading

Iodice

Laora

Tamagnini

et al. 2023

Num Anal Meth Geomechanics

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This work is a numerical investigation of the effect of thermally induced volumetric collapse of normally consolidated clays on the performance of energy piles. A series of coupled thermo-hydro-mechanical Finite Element simulations were carried out using the commercial software ABAQUS. These examined a single free-head energy pile embedded in a normally consolidated clay layer subjected to a constant mechanical load and to a number of heating/cooling cycles, to reproduce operating conditions. The soil behaviour was described with two advanced hypoplastic constitutive models for clays, one of which incorporates the thermally induced volumetric collapse using an ad-hoc algorithm developed by the authors. Both models predict a cyclic accumulation of settlement and excess pore water pressure, especially when the thermal collapse effect is considered. While the excess pore pressure distribution stabilises within a few cycles, the rate of settlement of the pile head does not show any tendency to decrease from one cycle to another. These results are in agreement with data from small scale tests on an isolated energy pile in normally consolidated clay, indicating that the numerical model developed in this study can be used to investigate the complex soil/pile/raft interaction processes occurring in real piled foundations incorporating energy piles.

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“…García-Céspedes et al [10] conducted a review on the use of shallow geothermal energy in the 5GDHN. Soil and groundwater can also be used to store low-temperature thermal energy through seasonal thermal energy storages, such as boreholes and aquifers (see for example Meibodi et al [11]). In addition, 5GDHNs can be fed by low temperature heat from sea, lake, and river water or sewage water, which are considered "ambient energy" under EU Directive 2018/2001 [12].…”

Section: Introductionmentioning

confidence: 99%

Design of a 5th Generation District Heating Substation Prototype for a Real Case Study

Martinazzoli

Pasinelli²,

Lezzi

et al. 2023

Sustainability

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The evolution of district heating networks is moving toward low temperatures in heat distribution with so called 4th generation networks. However, the lowest heat transfer fluid temperatures in district heating are achieved through ultra-low temperature networks, referred to as 5th generation district heating networks (5GDHNs). Low temperatures in heat distribution results in an extremely different configuration of 5GDHN compared to traditional district heating network, especially in the grid substation due to the inability to directly couple the grid with the buildings. This paper presents a detailed design of a 5th generation substation prototype, which is carried out to verify the proper operation and monitor the performance of this type of substation in a real case study. The prototype is fed by low-temperature waste heat, currently dissipated through evaporative towers, and will be built in the city of Brescia, Italy. The layout of the substation prototype, consisting of a bidirectional pumping system, a reversible water-to-water heat pump, an inertial thermal energy storage and a heat exchanger, is presented. An analysis is performed to figure out which refrigerant offers the best performance of the heat pump. In addition, fixed the refrigerant, the performance of the grid connected heat pump is found to be increased from 29.5% to 55.5% for both heating and cooling compared with a stand-alone air-to-water heat pump solution. Finally, the process flow diagram and the piping and instrumentation diagram of the substation are presented and commented.

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The future role of energy geostructures in fifth generation district heating and cooling networks

Cited by 45 publications

References 110 publications

Technological Advancements and Challenges of Geothermal Energy Systems: A Comprehensive Review

Technological Advancements and Challenges of Geothermal Energy Systems: A Comprehensive Review

Numerical analysis of energy piles in a hypoplastic soft clay under cyclic thermal loading

Design of a 5th Generation District Heating Substation Prototype for a Real Case Study

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