Lifecycle greenhouse gas emissions of thermal energy storage implemented in a paper mill for wind energy utilization

In practical work, implementation of the technology of aquifer thermal energy storage(ATES) is divided into energy storage phase and energy utilization phase. Sufficient cold/warm water is stored in energy storage phase, and the stored cold/warm water is consumed in energy utilization phase, so as to achieve the purpose of cooling or heating. In this paper, taking Sanhejian Coal Mine as an example, we analyze the effect of cold energy storage in multi-wells by analyzing the volume change of cold water body within different temperature ranges in different periods. Through the analysis of volume change of cold water body, it can prove in the cooling process, all of the 2-5°C cold water body is consumed, and then the 5-10°C cold water body is consumed. The volume of 10-15°C cold water body is stable, because with the consumption of colder water, part of low temperature water body changes into high temperature water body, adding the 10-15°C cold water body in aquifers. And in condition 1, there are almost the same volume of 2-5°C, 2-10°C and 2-15 °C cold water in the four cold energy storage wells.The running of 1-1’ wells, 2-2’ wells, 3-3’ wells and 4-4’ wells by sequence, all of the 2-5°C cold water body is consumed, and the 5-10°C cold water body is the mainly cold water body for cooling, and the consumption of 10-15°C cold water body is small. It proves that the cooling wells normally run, and the cold water body for cooling is sufficient, which can meet the need of cooling.

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Greenhouse gas emissions of aquifer thermal energy storage (ATES)

10.5194/egusphere-egu21-5052 ◽

2021 ◽

Author(s):

Ruben Stemmle ◽

Philipp Blum ◽

Simon Schüppler ◽

Paul Fleuchaus ◽

Melissa Limoges ◽

...

Keyword(s):

Life Cycle ◽

Energy Storage ◽

Regression Model ◽

Greenhouse Gas ◽

Thermal Energy ◽

Thermal Energy Storage ◽

Ghg Emissions ◽

Conventional Heating ◽

Aquifer Thermal Energy Storage ◽

Electricity Mix

Aquifer Thermal Energy Storage (ATES) is an open-loop geothermal system enabling seasonal storage of thermal energy in groundwater. It is a promising technology for environmentally friendly energy generation that can overcome the seasonal mismatch between demand and supply of heating and cooling and helps to reduce greenhouse gas (GHG) emissions. Yet, there are only few studies quantifying GHG emissions caused by ATES systems over their entire life cycle. This study presents a novel life cycle assessment (LCA) regression model focusing on the GHG emissions that is a fast alternative to conventional time-consuming LCA. Due to its parametric structure, the regression LCA model can be used to perform Monte Carlo simulations of a wide range of different ATES configurations. Accordingly, it allows the environmental evaluation of the technology as a whole.The application of the model reveals that the median value of investigated ATES configurations is 83.2&#160;gCO2eq/kWhth with most of the emissions resulting from electricity consumption during the operational phase. Compared to conventional heating systems based on heating oil and natural gas, this value reveals potential GHG savings of up to 74&#160;%. In terms of cooling, ATES can save up to about 59&#160;% of GHG emissions compared to conventional, electricity-based technologies. Specific GHG emissions from a modified LCA regression model considering a projected electricity mix for the year 2050 add up to 10.5&#160;gCO2eq/kWhth forecasting even higher emission savings of up to 97&#160;%. A sensitivity analysis reveals that in particular the operational time for cooling and the coefficient of performance (COP) of the heat pump should be carefully considered when planning or optimizing new systems under current conditions. In contrast, when considering the projected 2050 electricity mix, the most important system parameter is the number of wells. This reflects the decreasing importance of the electrical power necessary for ATES operation due to the much lower specific GHG emissions of the projected 2050 electricity mix.

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A Wind Power Plant with Thermal Energy Storage for Improving the Utilization of Wind Energy

Energies ◽

10.3390/en10122126 ◽

2017 ◽

Vol 10 (12) ◽

pp. 2126 ◽

Cited By ~ 13

Author(s):

Chang Liu ◽

Mao-Song Cheng ◽

Bing-Chen Zhao ◽

Zhi-Min Dai

Keyword(s):

Energy Storage ◽

Power Plant ◽

Wind Energy ◽

Wind Power ◽

Thermal Energy ◽

Thermal Energy Storage ◽

Wind Power Plant

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CONCEPT OF EFFICIENT REDUCING GREENHOUSE GAS EMISSIONS IN UKRAINE’S ENERGY SECTOR

Economy of Ukraine ◽

10.15407/economyukr.2019.06.003 ◽

2019 ◽

Vol 2019 (6) ◽

pp. 3-17

Author(s):

Oleksandr SERDIUK ◽

Keyword(s):

Private Sector ◽

Greenhouse Gas Emissions ◽

Greenhouse Gas ◽

Thermal Energy ◽

Renewable Energy Sources ◽

Energy System ◽

Energy Sector ◽

Economic Incentives ◽

Gas Emissions ◽

Economic Point

Ukraine’s energy system, namely the sector of thermal energy, is the country’s largest producer of greenhouse gas emissions nowadays. Given the significant contribution of Ukraine’s energy sector to the nationwide producing greenhouse gas emissions, the need for its restructuring is becoming increasingly obvious from an economic point of view. However, the lack of economic incentives for private parties and the limited financial capacity of the public sector hamper the implementation of appropriate measures. Given that the natural economic incentives for reducing greenhouse gas emissions from the private sector in the energy sector (80% of the thermal energy sector belongs to the private sector) can only arise in the event of a change in the energy market situation, this raises the question of how to effectively use the limited financial resources of the state for such needs. In view of this, the concept of reducing greenhouse gas emissions in Ukraine’s energy sector is developed, which should be implemented in three stages: (i) the optimization of electricity generation at the TPPs by bringing the load to the maximum and relatively efficient levels, at which the largest amount of energy will be generated per unit of greenhouse gas emissions; (ii) clustering of TPPs into two groups by the performance indicators of operation: the identifying relatively efficient TPPs to be modernized; (iii) ranking of relatively inefficient TPPs by priority for replacement with renewable energy sources. To identify the enterprises in relation to which the proposed measures should be applied, the software is developed, which will determine the relevant information by analyzing the data characterizing the activity of enterprises.

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Research Progress on the Phase Change Materials for Cold Thermal Energy Storage

Energies ◽

10.3390/en14248233 ◽

2021 ◽

Vol 14 (24) ◽

pp. 8233

Author(s):

Xinghui Zhang ◽

Qili Shi ◽

Lingai Luo ◽

Yilin Fan ◽

Qian Wang ◽

...

Keyword(s):

Energy Storage ◽

Phase Change ◽

Thermal Energy ◽

Thermal Energy Storage ◽

Phase Change Materials ◽

Supply And Demand ◽

Energy Utilization ◽

Research Progress ◽

Low Temperature Storage ◽

Free Cooling

Thermal energy storage based on phase change materials (PCMs) can improve the efficiency of energy utilization by eliminating the mismatch between energy supply and demand. It has become a hot research topic in recent years, especially for cold thermal energy storage (CTES), such as free cooling of buildings, food transportation, electronic cooling, telecommunications cooling, etc. This paper summarizes the latest research progress of the PCMs-based CTES. Firstly, the classification of PCMs for low temperature storage is introduced; the thermal physical properties (e.g., phase change temperature (PCT) and latent heat) of suitable PCM candidates (−97 to 30 °C) for CTES are summarized as well. Secondly, the techniques proposed to enhance the thermal properties of PCMs are presented, including the addition of nanomaterials, the microencapsulation and the shape stabilization. Finally, several representative applications (−97 to 65 °C) of PCMs in different CTES systems are discussed. The present review provides a comprehensive summary, systematical analysis, and comparison for the PCMs-based CTES systems, which can be helpful for the future development in this field.

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