scholarly journals Application of ORC in a Distributed Integrated Energy System Driven by Deep and Shallow Geothermal Energy

Energies ◽  
2021 ◽  
Vol 14 (17) ◽  
pp. 5466
Author(s):  
Hongmei Yin ◽  
Likai Hu ◽  
Yang Li ◽  
Yulie Gong ◽  
Yanping Du ◽  
...  
Keyword(s):  
Power Generation ◽  
Temperature Field ◽  
Geothermal Energy ◽  
Heating System ◽  
Energy System ◽  
Integrated System ◽  
Generation Mode ◽  
Integrated Energy System ◽  
Shallow Geothermal Energy ◽  
Flexible Generation

This study presents a distributed integrated energy system driven by deep and shallow geothermal energy based on forward and reverse cycle for flexible generation of cold, heat and electricity in different scenarios. By adjusting the strategy, the system can meet the demand of heat-electricity in winter, cool-electricity in summer and electricity in transition seasons. The thermodynamic analysis shows that the thermal efficiency of the integrated energy system in the heating and power generation mode is 16% higher than that in the cooling and power generation mode or the single power generation mode. Meanwhile, the annual heat-obtaining quantity of the system is reduced by 11% compared with that of the independent power generation system, which effectively alleviates the imbalance of the temperature field of the shallow geothermal reservoir. In terms of net power generation, the integrated energy system can generate approximately 31% more electricity than the conventional independent cooling and heating system under the same cooling and heating capacity. An integrated system not only realizes the comprehensive supply of cold and thermal ower by using clean geothermal efficiency, but also solves the temperature imbalance caused by the attenuation of a shallow geothermal temperature field. It provides a feasible way for carbon emission reduction to realize sustainable and efficient utilization of geothermal energy.

Shallow geothermal energy integration in district heating system: An example from Serbia

2020 ◽  
Vol 147 ◽  
pp. 2791-2800 ◽  
Author(s):  
Miroslav V. Kljajić ◽  
Aleksandar S. Anđelković ◽  
Vaclav Hasik ◽  
Vladimir M. Munćan ◽  
Melissa Bilec
Keyword(s):  
Geothermal Energy ◽  
District Heating ◽  
Heating System ◽  
Energy Integration ◽  
District Heating System ◽  
Shallow Geothermal Energy

scholarly journals Optimal Planning of Integrated Energy Systems Based on Coupled CCHP

Energies ◽  
2018 ◽  
Vol 11 (10) ◽  
pp. 2621 ◽  
Author(s):  
Xiaofeng Dong ◽  
Chao Quan ◽  
Tong Jiang
Keyword(s):  
Power Generation ◽  
Energy Use ◽  
Clean Energy ◽  
Energy System ◽  
Power Lines ◽  
Gas Pipelines ◽  
Integrated Energy Systems ◽  
Integrated Energy System ◽  
Gas Price ◽  
Combined Cooling

With the widespread attention on clean energy use and energy efficiency, the integrated energy system (IES) has received considerable research and development. This paper proposed an electricity-gas IES optimization planning model based on a coupled combined cooling heating and power system (CCHP). The planning and operation of power lines and gas pipelines are considered. Regarding CCHP as the coupled hub of an electricity-gas system, the proposed model minimizes total cost in IES, with multistage planning and multi-scene analyzing. Renewable energy generation is also considered, including wind power generation and photovoltaic power generation. The numerical results reveal the replacing and adding schemes of power lines and gas pipelines, the optimal location and capacity of CCHP. In comparison with conventional separation production (SP), the optimization model which regards CCHP as the coupled hub attains better economy. At the same time, the influence of electricity price and natural gas price on the quantities of purchasing electricity and purchasing gas in the CCHP system is analyzed. According to the simulation result, a benchmark gas price is proposed, which shows whether the CCHP system chooses power generation. The model results and discussion demonstrate the validity of the model.

scholarly journals Adsorption of Silicate Anions from Geothermal Brine Using Chitosan-Polyethylene Glycol Composite to Prevent Silica Scaling on the Dieng Geo Dipa Geothermal Energy System

2021 ◽  
Vol 21 (5) ◽  
pp. 1063
Author(s):  
Nur Hayati ◽  
Hanik Humaida ◽  
Dwi Siswanta
Keyword(s):  
Power Generation ◽  
Polyethylene Glycol ◽  
Geothermal Energy ◽  
Contact Time ◽  
Electricity Generation ◽  
Freundlich Isotherm ◽  
Energy System ◽  
Geothermal Brine ◽  
Pseudo Second Order ◽  
Membrane Adsorbent

Silica scaling is a common problem in geothermal power generation facilities which inhibits electricity generation. In order to provide a solution to this problem, the removal of silicate ions using CPEG-TOMAC (Chitosan-polyethylene glycol–trioctyl methyl ammonium chloride) membrane adsorbent was investigated for geothermal brine from Geo Dipa Energy, Dieng. The process is dependent on contact time, pH, and the concentration of silicate. An adsorption batch study that used adsorbents for the geothermal brine of the Dieng Geo Dipa reactor 28A showed that CPEG TOMAC at pH 6 resulted in an adsorption capacity of 72.6 mg g–1. Furthermore, the adsorption of silicate ions onto the membrane followed pseudo-second-order kinetics and the Freundlich isotherm model.

scholarly journals A Robust Operation Method with Advanced Adiabatic Compressed Air Energy Storage for Integrated Energy System under Failure Conditions

Machines ◽  
2022 ◽  
Vol 10 (1) ◽  
pp. 51
Author(s):  
Rong Xie ◽  
Weihuang Liu ◽  
Muyan Chen ◽  
Yanjun Shi
Keyword(s):  
Energy Storage ◽  
Energy System ◽  
Integrated System ◽  
Compressed Air ◽  
Stable Operation ◽  
Compressed Air Energy Storage ◽  
Release Process ◽  
Operation Method ◽  
Integrated Energy System ◽  
Failure Conditions

Integrated energy system (IES) is an important direction for the future development of the energy industry, and the stable operation of the IES can ensure heat and power supply. This study established an integrated system composed of an IES and advanced adiabatic compressed air energy storage (AA-CAES) to guarantee the robust operation of the IES under failure conditions. Firstly, a robust operation method using the AA-CAES is formulated to ensure the stable operation of the IES. The method splits the energy release process of the AA-CAES into two parts: a heat-ensuring part and a power-ensuring part. The heat-ensuring part uses the high-temp tank to maintain the balance of the heat subnet of the IES, and the power-ensuring part uses the air turbine of the first stage to maintain the balance of the power subnet. Moreover, another operation method using a spare gas boiler is formulated to compare the income of the IES with two different methods under failure conditions. The results showed that the AA-CAES could guarantee the balance of heat subnet and power subnet under steady conditions, and the dynamic operation income of the IES with the AA-CAES method was a bit higher than the income of the IES with the spare gas boiler method.

Development and testing of an innovative energy wall system in Torino (Italy)

2020 ◽  
Author(s):  
Matteo Baralis ◽  
Marco Barla
Keyword(s):  
Heat Exchange ◽  
Exchange Rates ◽  
Urban Areas ◽  
Geothermal Energy ◽  
High Efficiency ◽  
Cost Benefit ◽  
Energy System ◽  
Test System ◽  
Existing Building ◽  
Shallow Geothermal Energy

<p>Shallow geothermal energy (SGE) is increasingly being regarded as a valuable solution for space heating and conditioning because of high efficiency, diffuse availability and low environmental impact. Significant growth in the number of installations is envisaged as a result of energy policies and European Directives. Indeed, the obligations in the construction sector about the share of energy supply from renewable sources is increasingly pushing the design of new and renovated buildings. On the one hand shallow geothermal energy is suitable as a sustainable and distributed energy source. On the other hand, significant installation costs related to drilling of traditional installations represent an hampering factor. Thermally activating geostructures such as piles, diaphragm wall, tunnels and anchors can allow to include these costs in the construction of the structural elements. Moreover, a large availability of operational surface is represented by new and/or existing building heritage in urban areas as most of them  have underground levels that can be equipped with heat exchangers.</p><p>This contribution introduces a novel modular very shallow geothermal exchanger as part of a Heating, Ventilation and Air Conditioning (HVAC) system. The system concept allows its application not only to new structures and buildings but also to existing ones. While the low depths interested may penalize the heat exchange rates, on the contrary, extremely low installation costs make the cost-benefit ratio of this new technology extremely interesting and promising.</p><p>A first prototype consisting of three modules was designed by the authors and installed in an office building in Torino (Italy). External deployment of pipes to the basement wall in two different arrangements was realized in order to test system efficiency. Due to the experimental nature of the tests, a large number of sensors were placed to monitor the additional stresses and strains on the wall and the thermal regime of the partially saturated ground volume involved in heat exchange.</p><p>Preliminary thermal performance tests were performed together with numerical modelling re-interpretation. On the basis of the first tests and interpretation carried out, it was demonstrated that remarkable heat exchange rates of up to 20 and 27 W/m<sup>2</sup> could be injected/extracted from the ground in summer and winter respectively. Furthermore, the monitoring records suggest that extremely low affection of ground thermal status is operated by the system with respect to analogous non thermo-active walls. This evidence is extremely promising in the perspective of wide and dense diffusion of this new shallow geothermal energy system in urban areas where thermal interferences should be limited or avoided.</p>

scholarly journals Renewable Energy Sources in a Post-Socialist Transitional Environment: The Influence of Social Geographic Factors on Potential Utilization of Very Shallow Geothermal Energy within Heating Systems in Small Serbian Town of Ub

2020 ◽  
Vol 10 (8) ◽  
pp. 2739 ◽  
Author(s):  
Nikola Jocić ◽  
Johannes Müller ◽  
Tea Požar ◽  
David Bertermann
Keyword(s):  
Climate Change ◽  
Renewable Energy ◽  
Geothermal Energy ◽  
Renewable Energy Sources ◽  
Heating System ◽  
Energy Sources ◽  
Wide Range ◽  
Energetic Stability ◽  
Shallow Geothermal Energy ◽  
Very Shallow Geothermal Energy

Energetic stability is a precondition for a regular functioning of society and economy. Actual climate change raised the awareness of population and policy makers about the importance of exploited energy sources. Renewable energy sources are revealed as the solution which should satisfy both needs—a need for energetic stability, as well as a need for producing ‘clean’ and ‘sustainable’ energy, and therefore reduce humans’ influence on the climate change. Very shallow geothermal energy offers wide range for utilization, among others for heating and cooling living spaces. This article shows potentials of low temperature heating system networks in a small Serbian town of Ub. In addition to technical possibilities, this article combines geographical and social, as well as political and economic circumstances in the town of Ub, which emerge as a result of a complex (post-socialist) transitional vortex.

scholarly journals Research on complex integrated energy planning and operation optimization

2021 ◽  
Vol 336 ◽  
pp. 05025
Author(s):  
Zhou Wen ◽  
Liang Meng ◽  
Zhengfu Yang ◽  
Zhibin Liu ◽  
Yajing Liu
Keyword(s):  
Energy System ◽  
Integrated System ◽  
Energy Planning ◽  
Utilization Rate ◽  
Stable Operation ◽  
Low Carbon ◽  
Energy System Model ◽  
Integrated Energy System ◽  
Scheduling Method ◽  
The Stability

The safe and stable operation of the energy system is the top priority of the world in the industrial field. The energy integrated system optimizes the system through multiple channels and cascade utilization of energy, which greatly improves the utilization rate of energy and provides a convenient way for the development of low-carbon society. In this paper, the composite integrated energy system model is constructed through the analysis of the structure of the integrated energy system. On this basis, a coordinated optimal scheduling method for integrated energy system with multiple energy stations is proposed, which takes the system operation economy as the goal. The case simulation results show that the coordinated operation of energy stations can greatly improve the stability and economy of the hybrid integrated energy system.

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