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Liu, Z., Yang, X., Jia, W. & Li, H. (2020). Justification of CO2 as the working fluid for a compressed gas energy storage system: A thermodynamic and economic study. Journal of Energy Storage, 27, Article ID 101132.
Open this publication in new window or tab >>Justification of CO2 as the working fluid for a compressed gas energy storage system: A thermodynamic and economic study
2020 (English)In: Journal of Energy Storage, E-ISSN 2352-152X, Vol. 27, article id 101132Article in journal (Refereed) Published
Abstract [en]

The compressed carbon dioxide (CO2) energy storage (CCES) system has been attracting more and more attentions in recent years. The CCES system leads the way of green solutions to accommodating the intermittency of renewable power generation systems in a large-scale energy storage pattern. Particularly, the usage of CO2 as the working medium for CCES successfully offers a green solution to massive carbon capture and storage. This paper aims to further analyze the applicability and feasibility of a novel CCES system with the merit of efficiently and economically utilizing pressure energy and thermal energy. Thermodynamic and cost evaluation on the energy conversion cycle were carried out. Genetic algorithm was employed to perform multi-objective optimization on the novel energy conversion cycle with thermal energy storage towards maximizing exergy efficiency and economic profits. Results reveal that the net output power monotonously increases with turbine inlet temperature, but the unit product cost monotonously decreases with turbine inlet temperature. The multi-objective optimization recommends a 60.5% for the overall exergy efficiency and 0.23 $/kWh for the unit product cost. Moreover, scattered distribution of decision variables suggests always a higher outlet pressure for compressor. 

Place, publisher, year, edition, pages
Elsevier Ltd, 2020
National Category
Energy Engineering
Identifiers
urn:nbn:se:mdh:diva-46636 (URN)10.1016/j.est.2019.101132 (DOI)2-s2.0-85076253661 (Scopus ID)
Available from: 2020-01-02 Created: 2020-01-02 Last updated: 2020-01-02Bibliographically approved
Li, B., Nian, V., Shi, X., Li, H. & Boey, A. (2020). Perspectives of energy transitions in East and Southeast Asia. Wiley Interdisciplinary Reviews: Energy and Environment, 9(1), Article ID e364.
Open this publication in new window or tab >>Perspectives of energy transitions in East and Southeast Asia
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2020 (English)In: Wiley Interdisciplinary Reviews: Energy and Environment, ISSN 2041-8396, E-ISSN 2041-840X, Vol. 9, no 1, article id e364Article in journal (Refereed) Published
Abstract [en]

Energy transitions are designed to improve the resilience, sustainability, and productivity of a country's energy system, and are the key instruments to mitigating the warming climate. Countries and regions have unique circumstances when projecting energy transition pathways. Nonetheless, East Asian economies have shared opportunities and challenges. From the perspective of fuel mix, East Asia had some initial success in renewable energy development accompanied by energy efficiency improvements. Nuclear energy, although controversial, has been well developed and is continuing its advancement in East Asia. However, the dominance of coal in the energy mix has not been sufficiently addressed, mostly because of legacy issues. The region's renewable energy potential is also underdeveloped due to a mismatch between resources and energy demand. Since the region as whole is well endowed with renewable energy resources, the region's advancement in regional energy connectivity presents a valuable institutional asset to further decarbonize East Asian energy sector beyond individual nation's efforts. This article is categorized under: Energy and Climate > Economics and Policy Energy Policy and Planning > Economics and Policy Energy and Development > Economics and Policy.

Place, publisher, year, edition, pages
John Wiley and Sons Ltd, 2020
Keywords
East Asia, energy interconnection, energy transition, legacy issues, regional integration, Economics, Energy efficiency, Energy policy, Sustainable development, Energy transitions, Renewable energy resources
National Category
Earth and Related Environmental Sciences
Identifiers
urn:nbn:se:mdh:diva-47111 (URN)10.1002/wene.364 (DOI)2-s2.0-85071752094 (Scopus ID)
Available from: 2020-02-20 Created: 2020-02-20 Last updated: 2020-02-20Bibliographically approved
Zheng, W., Hennessy, J. & Li, H. (2020). Reducing renewable power curtailment and CO2 emissions in China through district heating storage. Wiley Interdisciplinary Reviews: Energy and Environment, 9(1), Article ID e361.
Open this publication in new window or tab >>Reducing renewable power curtailment and CO2 emissions in China through district heating storage
2020 (English)In: Wiley Interdisciplinary Reviews: Energy and Environment, ISSN 2041-8396, E-ISSN 2041-840X, Vol. 9, no 1, article id e361Article in journal (Refereed) Published
Abstract [en]

Emissions reductions are often achieved through the increased share of renewable energy sources (RES) and China is the leader in the growth of RES in the power sector. This growth has led to high levels of curtailment of RES power due to insufficient reinforcement of the electricity grid to support such growth and due to competition with other power sources. Although the problem of curtailment has been alleviated in recent years, large amounts of power are still discarded, and it is important to consider how to address this problem in the short term and how much CO2e emissions could be avoided as a result. The use of district heating systems to reduce the curtailment of renewable power has seen increasing interest in recent years. Based on a review of potential energy storage in district heating, the current paper assesses the capability to use the national storage potential of district heating systems in China to reduce curtailment and to determine what effects that may have on avoiding CO2e emissions. The distribution networks and the thermal inertia of buildings connected to district heating are considered as two major forms of storage that can be “charged” using power that would otherwise be curtailed. The results show that there may be sufficient storage available to absorb all renewable power that is currently curtailed in those provinces using district heating during the heating season, resulting in avoided emissions of up to 14 MtCO2e/annum. This article is categorized under: Energy and Climate > Economics and Policy Wind Power > Climate and Environment Energy Infrastructure > Climate and Environment Energy and Urban Design > Climate and Environment.

Place, publisher, year, edition, pages
John Wiley and Sons Ltd, 2020
Keywords
CO2 emission, district heating storage, renewable power curtailment, thermal inertia, Carbon dioxide, Electric energy storage, Heating equipment, Potential energy, Wind power, Avoided emissions, CO2 emissions, District heating system, Emissions reduction, Energy infrastructures, Renewable energy source, Renewable Power, District heating
National Category
Energy Engineering
Identifiers
urn:nbn:se:mdh:diva-47112 (URN)10.1002/wene.361 (DOI)2-s2.0-85070734905 (Scopus ID)
Available from: 2020-02-20 Created: 2020-02-20 Last updated: 2020-02-20Bibliographically approved
Wu, S., Xiong, R., Li, H., Nian, V. & Ma, S. (2020). The state of the art on preheating lithium-ion batteries in cold weather. Journal of Energy Storage, 27, Article ID 101059.
Open this publication in new window or tab >>The state of the art on preheating lithium-ion batteries in cold weather
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2020 (English)In: Journal of Energy Storage, E-ISSN 2352-152X, Vol. 27, article id 101059Article in journal (Refereed) Published
Abstract [en]

Preheating batteries in electric vehicles under cold weather conditions is one of the key measures to improve the performance and lifetime of lithium-ion batteries. In general, preheating can be divided into external heating and internal heating, depending on the location of the heat source. External heating methods are usually characterized by low system complexity, long heating time and high energy loss; while internal heating methods can achieve a shorter heating time, a higher heating efficiency and lower impacts on thermal-induced aging but at a higher risk in safety. Through reviewing recent progress in the development of preheating methods for lithium-ion batteries, this paper provides insights on developing new preheating techniques and guidance on the selection of preheating methods. 

Place, publisher, year, edition, pages
Elsevier Ltd, 2020
Keywords
Battery thermal management, Electric vehicles, External heating, Internal heating, Lithium-ion battery preheating, Battery management systems, Energy dissipation, Ions, Preheating, Battery thermal managements, Heat sources, Heating efficiencies, Recent progress, State of the art, System complexity, Lithium-ion batteries
National Category
Energy Engineering Energy Systems
Identifiers
urn:nbn:se:mdh:diva-46153 (URN)10.1016/j.est.2019.101059 (DOI)2-s2.0-85074704695 (Scopus ID)
Available from: 2019-12-10 Created: 2019-12-10 Last updated: 2019-12-10Bibliographically approved
Li, H., Song, J., Sun, Q., Wallin, F. & Zhang, Q. (2019). A dynamic price model based on levelized cost for district heating. Energy, Ecology and Environment, 4(1), 15-25
Open this publication in new window or tab >>A dynamic price model based on levelized cost for district heating
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2019 (English)In: Energy, Ecology and Environment, ISSN 2363-7692, Vol. 4, no 1, p. 15-25Article in journal (Refereed) Published
Abstract [en]

District Heating (DH) is facing a tough competition in the market. In order to improve its competence, an effective way is to reform price models for DH. This work proposed a new dynamic price model based on the levelized cost of heat (LCOH) and the predicted hourly heat demand. A DH system in Sweden was used as a case study. Three methods were adopted to allocate the fuel cost to the variable costs of heat production, including (1) in proportion to the amount of heat and electricity generation; (2) in proportion to the exergy of generated heat and electricity; and (3) deducting the market price of electricity from the total cost. Results indicated that the LCOH-based pricie model can clearly reflect the production cost of heat. Through the comparison with other market-implemented price models, it was found that even though the market-implemented price models can, to certain extent, reflect the variations in heat demand, they cannot reflect the changes in production cost when different methods of heat production are involved. In addition, price model reforming can lead to a significant change in the expense of consumers and consequently, affect the selection of heating solution.

Place, publisher, year, edition, pages
Joint Center on Global Change and Earth System Science of the University of Maryland and Beijing Normal University, 2019
Keywords
District heating, Dynamic heat price, Heat demand, Levelized cost of heat, Price model
National Category
Energy Engineering Energy Systems
Identifiers
urn:nbn:se:mdh:diva-42917 (URN)10.1007/s40974-019-00109-6 (DOI)2-s2.0-85062437670 (Scopus ID)
Available from: 2019-03-19 Created: 2019-03-19 Last updated: 2019-08-13Bibliographically approved
Nian, V., Jindal, G. & Li, H. (2019). A feasibility study on integrating large-scale battery energy storage systems with combined cycle power generation – Setting the bottom line. Energy, 185, 396-408
Open this publication in new window or tab >>A feasibility study on integrating large-scale battery energy storage systems with combined cycle power generation – Setting the bottom line
2019 (English)In: Energy, ISSN 0360-5442, E-ISSN 1873-6785, Vol. 185, p. 396-408Article in journal (Refereed) Published
Abstract [en]

Strong attention has been given to the costs and benefits of integrating battery energy storage systems (BESS) with intermittent renewable energy systems. What's neglected is the feasibility of integrating BESS into the existing fossil-dominated power generation system to achieve economic and environmental objectives. In response, a life cycle cost-benefit analysis method is introduced in this study taking into consideration three types of battery technologies, namely, vanadium redox flow battery, zinc bromine flow battery, and lithium-iron-phosphate battery. The objective is to evaluate the life cycle carbon emissions and cost of electricity production by combined cycle power generation with grid-connected BESS. Findings from the Singapore case study suggest a potential 3–5% reduction in the life cycle carbon emission factors which could translate to a cumulative carbon emission reduction of 9–16 million tonnes from 2018 to 2030 from electricity generation. Grid-connected BESS could reduce the levelized cost of electricity by 4–7%. A synergistic planning of CCGT and BESS could theoretically reduce the system level power generation capacity by 26% albeit a potential increase in the overall capital cost at the current cost of batteries. The projected battery cost reduction is critical in improving the feasibility of large-scale deployment. 

Place, publisher, year, edition, pages
Elsevier Ltd, 2019
Keywords
Cost benefit analysis, Energy storage system, Life cycle analysis, Lithium ion battery, Vanadium redox flow battery, Zinc bromine flow battery
National Category
Mechanical Engineering
Identifiers
urn:nbn:se:mdh:diva-44932 (URN)10.1016/j.energy.2019.07.028 (DOI)000484869400033 ()2-s2.0-85068930332 (Scopus ID)
Available from: 2019-08-01 Created: 2019-08-01 Last updated: 2019-09-26Bibliographically approved
Lu, H., Yu, X., Li, H., Schwede, S. & Tu, S.-T. -. (2019). Accurately measurement and efficiently recovery of ionic liquid in energy utilization of microalgae. In: Energy Procedia: . Paper presented at 10th International Conference on Applied Energy, ICAE 2018, 22 August 2018 through 25 August 2018 (pp. 1337-1341). Elsevier Ltd, 158
Open this publication in new window or tab >>Accurately measurement and efficiently recovery of ionic liquid in energy utilization of microalgae
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2019 (English)In: Energy Procedia, Elsevier Ltd , 2019, Vol. 158, p. 1337-1341Conference paper, Published paper (Refereed)
Abstract [en]

Chlorella vulgais, a kind of micro-alagae, is an attracting feedstock for bioenergy production, such as biodiesel and biogas. But its tough cell wall structure is the main obstacle to efficiently extracting lipids and other biomass. Ionic liquid (IL) can be used to hydrolyze its cell-wall. However, due to its high cost and toxicity, it is important to recover IL as much as possible. Therefore, a method that can accurately measure the content of ILs, is urgently needed. In this work, two common methods that are used to measure the content of ILs: equimolar titration method and ultraviolet absorbance spectra were compared. The results show that equimolar titration method is not available for trace quantity analysis of ionic liquids as the endpoint of titration is hard to be identified at low IL content (<10 mg/L); while UV absorbance spectra method can be used at low IL contents, whereas, it may result in big deviations. To further improve the accuracy of UV absorbance spectra method, concentrating the sample could be a potential solution.

Place, publisher, year, edition, pages
Elsevier Ltd, 2019
Keywords
Chlorella, Industrial ionic liquid, Lipids extraction, Biomass, Energy utilization, Lipids, Titration, Bioenergy productions, Cell wall structure, Cell walls, Micro-algae, Quantity analysis, Ultraviolet absorbance, UV absorbance spectra, Ionic liquids
National Category
Energy Engineering
Identifiers
urn:nbn:se:mdh:diva-43193 (URN)10.1016/j.egypro.2019.01.328 (DOI)000471031701108 ()2-s2.0-85063873518 (Scopus ID)
Conference
10th International Conference on Applied Energy, ICAE 2018, 22 August 2018 through 25 August 2018
Available from: 2019-04-25 Created: 2019-04-25 Last updated: 2019-07-11Bibliographically approved
Xi, X., Li, H., Wallin, F., Avelin, A., Yang, X. & Yu, Z. (2019). Air pollution related externality of district heating - A case study of Changping, Beijing. In: Energy Procedia: . Paper presented at 10th International Conference on Applied Energy (ICAE2018), 22-25 August 2018, Hong Kong, China (pp. 4323-4330). Elsevier Ltd
Open this publication in new window or tab >>Air pollution related externality of district heating - A case study of Changping, Beijing
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2019 (English)In: Energy Procedia, Elsevier Ltd , 2019, p. 4323-4330Conference paper, Published paper (Refereed)
Abstract [en]

Air pollution, caused by the use of fossil fuel, has been an environmental plague in China. It has a strong negative impact on human health. Since the costs of damage to health are not born by the pollution producers, these costs translate to social externality. Policies have an important role in optimizing resource allocation, such as penalizing the pollutant producers and incentivizing clean energy development. Among others, replacing coal with natural gas for heating represents an important example of air quality improvement measures. This paper presents a study that evaluates the health impacts from air pollution and the external cost of the "Coal-To-Gas" policy in district heating using Changping District (Beijing, China) as an example. Four scenarios were considered based on the historical and standard PM2.5 concentration. Results show that PM2.5 is responsible for causing an increase of 40% premature deaths in 2015 and that the monetary value of damage to health is higher than 1.2 billion CNY. In 2016 and 2017, the reported air quality was better than that in 2015. As a result, 13.3% and 26% premature deaths caused by air pollution were avoided in 2016 and 2017 compared to 2015 respectively. If the PM2.5 concentration level were to be reduced to national standard, the number of premature deaths attributed to PM2.5 could further decrease to 47.7% compared to 2015. Overall, the Coal-To-Gas policy in district heating reduces 0.017%~0.45% of premature death caused by air pollution each year. Air pollution reduction policies, which are expected to improve air quality together in the future, and the specific policy of Coal-To-Gas in district heating, could make great contribution to reducing the premature death caused by environmental problem and need more attention from the government and the public.

Place, publisher, year, edition, pages
Elsevier Ltd, 2019
Keywords
Coal-To-Gas, District heating, Externality, Health effect, PM2.5
National Category
Medical Engineering
Identifiers
urn:nbn:se:mdh:diva-43140 (URN)10.1016/j.egypro.2019.01.789 (DOI)000471031704105 ()2-s2.0-85063905381 (Scopus ID)
Conference
10th International Conference on Applied Energy (ICAE2018), 22-25 August 2018, Hong Kong, China
Available from: 2019-04-18 Created: 2019-04-18 Last updated: 2019-07-11Bibliographically approved
Lin, H., Fu, K., Wang, Y., Sun, Q., Li, H., Hu, Y., . . . Wennersten, R. (2019). Characteristics of electric vehicle charging demand at multiple types of location - Application of an agent-based trip chain model. Energy, 188, Article ID 116122.
Open this publication in new window or tab >>Characteristics of electric vehicle charging demand at multiple types of location - Application of an agent-based trip chain model
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2019 (English)In: Energy, ISSN 0360-5442, E-ISSN 1873-6785, Vol. 188, article id 116122Article in journal (Refereed) Published
Abstract [en]

This paper developed an agent-based trip chain model (ABTCM) to study the distribution of electric vehicles (EVs) charging demand and its dynamic characteristics, including flexibility and uncertainty, at different types of location. Key parameters affecting charging demand include charging strategies, i.e. uncontrolled charging (UC) and off-peak charging (OPC), and EV supply equipment, including three levels of charging equipment. The results indicate that the distributions of charging demand are similar as the travel patterns, featured by traffic flow at each location. A discrete peak effect was found in revealing the relation between traffic flow and charging demand, and it results in the smallest equivalent daily charging demand and peak load at public locations. EV charging and vehicle-to-grid (V2G) flexibility were examined by instantaneous adjustable power and accumulative adjustable amount of electricity. The EVs at home locations have the largest charging and V2G flexibility under the UC strategy, except for a period of regular working time. The V2G flexibility at work and public locations is generally larger than charging flexibility. Due to the fast charging application, the uncertainties of charging demand at public locations are the highest in all locations. In addition, the OPC strategy mitigates the uncertainty of charging demand. 

Place, publisher, year, edition, pages
Elsevier Ltd, 2019
Keywords
Agent-based trip chain model, Charging flexibility, Electric vehicle, Fast charging, Vehicle to grid
National Category
Transport Systems and Logistics Vehicle Engineering
Identifiers
urn:nbn:se:mdh:diva-45314 (URN)10.1016/j.energy.2019.116122 (DOI)000505271100103 ()2-s2.0-85072302928 (Scopus ID)
Available from: 2019-09-26 Created: 2019-09-26 Last updated: 2020-01-16Bibliographically approved
Du, Y., Wang, C., Li, H., Song, J. & Li, B. (2019). Clustering heat users based on consumption data. In: Energy Procedia: . Paper presented at 10th International Conference on Applied Energy, ICAE 2018, 22 August 2018 through 25 August 2018 (pp. 3196-3201). Elsevier Ltd, 158
Open this publication in new window or tab >>Clustering heat users based on consumption data
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2019 (English)In: Energy Procedia, Elsevier Ltd , 2019, Vol. 158, p. 3196-3201Conference paper, Published paper (Refereed)
Abstract [en]

In today's district heating (DH) energy market, it is common to use user functional categories in price models to determine the heat price. However, users in the same category do not necessarily have the same energy consumption patterns, which potentially leads to unfair prices and many other practical issues. Taking into account heat usage characteristics, this work proposes two data-driven methods to cluster DH users to identify similar usage patterns, using practical energy consumption data. Efforts are focused on extracting representative features of users from their daily usage profiles and duration curves, respectively. Employing clustering based on these features, the resulting typical usage patterns and user category distributions are discussed. Our results can serve as potential inputs for future energy price models, demand-side management, and load reshaping strategies.

Place, publisher, year, edition, pages
Elsevier Ltd, 2019
Keywords
Consumption profile, District heating, Duration curve, User clustering, Electric utilities, Data-driven methods, Energy markets, Future energies, Practical energies, Practical issues, Energy utilization
National Category
Energy Engineering
Identifiers
urn:nbn:se:mdh:diva-43194 (URN)10.1016/j.egypro.2019.01.1010 (DOI)000471031703087 ()2-s2.0-85063916560 (Scopus ID)
Conference
10th International Conference on Applied Energy, ICAE 2018, 22 August 2018 through 25 August 2018
Available from: 2019-04-25 Created: 2019-04-25 Last updated: 2019-08-13Bibliographically approved
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0002-6279-4446

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