Towards the increased utilisation of geothermal energy in a district heating network through the use of a heat storage

Kyriakis, Sotirios A.; Younger, Paul L.

doi:10.1016/j.applthermaleng.2015.10.094

Cited by 32 publications

(10 citation statements)

References 29 publications

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“…Geothermal energy has been attracting more and more attention in the past few decades due to its advantageous characteristics of cleanness, renewability and environmental friendliness1. Middle enthalpy geothermal energy, which occurs at temperatures varying from 90 to 150 °C, is generally stored in sandstone, limestone or granite at a depth of thousands of metres2.…”

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confidence: 99%

Experimental investigation of the hydraulic and heat-transfer properties of artificially fractured granite

Luo

Zhu

Guo

et al. 2017

Sci Rep

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In this paper, the hydraulic and heat-transfer properties of two sets of artificially fractured granite samples are investigated. First, the morphological information is determined using 3D modelling technology. The area ratio is used to describe the roughness of the fracture surface. Second, the hydraulic properties of fractured granite are tested by exposing samples to different confining pressures and temperatures. The results show that the hydraulic properties of the fractures are affected mainly by the area ratio, with a larger area ratio producing a larger fracture aperture and higher hydraulic conductivity. Both the hydraulic apertureand the hydraulic conductivity decrease with an increase in the confining pressure. Furthermore, the fracture aperture decreases with increasing rock temperature, but the hydraulic conductivity increases owing to a reduction of the viscosity of the fluid flowing through. Finally, the heat-transfer efficiency of the samples under coupled hydro-thermal-mechanical conditions is analysed and discussed.

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confidence: 99%

Experimental investigation of the hydraulic and heat-transfer properties of artificially fractured granite

Luo

Zhu

Guo

et al. 2017

Sci Rep

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“…According to the results, the adoption of the 4thgeneration heating systems combined with isolation leads to a successful heating system, where solar energy covered the local heat energy demand. Likewise, several authors have created a dynamic simulation model with regard to the energy economic assessment of geothermal, solar and biomass energy [19][20][21]. The proposed system has been modelled using the TRNSYS tool.…”

Section: Is It Economically Feasible On a Micro-scale?mentioning

confidence: 99%

The establishment of a micro-scale heat market using a biomass-fired district heating system

et al. 2020

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Background Local biomass potential in Southeastern European countries is relatively high. Nevertheless, biomass residues such as wood leftovers, straw and energy crops are often not properly managed or inefficiently utilised for energy purposes in individual house heating or domestic hot water preparation. This is more relevant in rural areas, where the utilisation of biomass resources is mainly based upon traditional technologies, has low efficiency or is carried out by using individual bases without local energy supply management. Usage of biomass residues in combination with other renewable energy sources is in agreement with the targets of the EU’s Energy and Climate Goals and promotes rural development and a circular economy. Methods For this purpose, local heating and domestic hot water preparation demands, as well as the available biomass potentials, were analysed and mapped by using a geographic information system (GIS). A model for analysing the optimal operation of the district heating boiler with a relatively high share of solar energy, which is backed up by either a short- or long-term heat storage, was developed. The model takes the supply and the return temperatures from the DH network into account and decides whether the excess of solar heat produced by the prosumers can be delivered into the network. This reduces heat overproduction and enables a smooth and uninterrupted operation of the system. Such configuration would benefit both the DH Company and the prosumers. The DH Company would have the opportunity to buy cheaper excess heat from the prosumers rather than to start its own and relatively slow biomass boiler. Results In this paper, several scenarios are proposed for the Romanian village Ghelinta. The target village is characterised by a small-scale biomass district heating boiler with thermal storage and prosumers with either solar thermal collectors or locally installed heat pumps. Integration of seasonal thermal storage and local prosumers can smooth out the biomass district heating boiler operation and bring additional socio-economic benefits for the bioenergy village communities. This could be the first step towards the establishment of a micro-scale thermal energy market. Conclusions Analysis has proven that the proposed system configuration is socio-technically feasible, even for micro-scale systems, as apparent in the Romanian target village Ghelinta. The main objective of this research is to analyse the implementation of a small-scale biomass and renewable energy-based district heating system and to prove the concept of bioenergy villages from a technical and economical perspective. Furthermore, the role of residential household prosumers has been analysed. Based on outcomes, the transferability of the results is also discussed, while several suggestions for stakeholders who implement such projects were formulated for future research as well.

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“…With respect to the water–heat nexus, it is vital to coordinate the heat supply and water consumption in the heating systems, and the geothermal water must be adjusted to match the seasonal changes (Eicker et al , 2015; Sayegh et al , 2016; Kyriakis and Younger, 2016). However, water consumption and geothermal water flows can affect geothermal heat production.…”

Section: Literature Reviewmentioning

confidence: 99%

Examination of the relationship between the exploitation of geothermal sources and regional economies: a Beijing case study

Jiang

Lei

Liu

et al. 2019

Water & Environment J

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Rapid urbanization has resulted in severe demands on water, heat and energy resources, which threaten the sustainability of the urban economy and environment. Geothermal energy is one of the cleanest sources of energy, and it plays an important role in the sustainability of the regional economy and environment. This paper employs the vector autoregressive (VAR) model to assess the effects of water, heat and energy consumption on geothermal adoption and the interactions among these factors. Beijing is chosen as a case study to investigate the water-heat-energy nexus and examination of the relationship between geothermal adoption and the regional economy. The results reveal that water consumption has mainly affected geothermal adoption. Water consumption and energy consumption have negative effects on geothermal adoption, while the centralized heat supply has a positive effect on geothermal adoption. This paper also adopts a gear model and coupling coordination degrees to investigate the relationship between geothermal adoption and the regional economy. The rates of geothermal adoption and the regional economy vary, but they are in a good state of coupling coordination. In addition, the coupling coordination of geothermal adoption and the regional economy has the potential to improve.

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Towards the increased utilisation of geothermal energy in a district heating network through the use of a heat storage

Cited by 32 publications

References 29 publications

Experimental investigation of the hydraulic and heat-transfer properties of artificially fractured granite

Experimental investigation of the hydraulic and heat-transfer properties of artificially fractured granite

The establishment of a micro-scale heat market using a biomass-fired district heating system

Examination of the relationship between the exploitation of geothermal sources and regional economies: a Beijing case study

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