In order to meet the growing need for cooling in buildings, solar air conditioning systems are a creative and environmentally friendly alternative. Solar energy is the primary energy source for producing chilled air, which can be used to maintain comforting inside temperatures. The working theories and components of several solar air conditioning systems, including hybrid, adsorption, and absorption systems, are thoroughly reviewed in this research. It also discusses the performance, efficiency, and economic feasibility of these systems and their environmental impact. The review highlights the potential benefits of solar air conditioning, such as plummeting greenhouse gas emissions, reducing energy usage, and enhancing indoor air quality. However, the paper also recognizes the limitations and challenges that need to be addressed to increase the widespread adoption of solar air conditioning systems. During our analysis, we found that solar air conditioning systems require consideration in terms of design and technological aspects. Ensuring these systems perform optimally in different climates and are economically viable is crucial. While there are challenges involved such as addressing the variations in resources and the initial setup costs. However, we are witnessing progress through advancements in materials, components, and control strategies. This continuous improvement inspires and reinforces the belief that solar air conditioning can become an accessible cooling solution for applications. This review provides a valuable resource for researchers, engineers, and policymakers interested in promoting sustainable and energy-efficient cooling technologies.

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Mohammad Azim Rasuli 
Department of Mechanical Engineering, Faculty of Engineering, Kabul University, Kabul, Afghanistan

Shuichi Torii 
Department of Mechanical System Engineering, Faculty of Engineering, Kumamoto University, Kumamoto, Japan

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The author(s) has received no specific funding for this article/publication.

The modern world's reliance on fossil fuels has led to many issues, including rising fuel prices, pollution, climate change, and geopolitical unrest. While massive effort is required to deal with climate change comprehensively. Developing alternative energy sources and storage technologies is an important priority that can only be gained over time by reducing these issues. Because of this, recent years have seen an increase in the use of high-power and high-energy density storage systems, increasing the use of renewable energy sources or improving transportation efficiency contribute to climate change mitigation. Renewable energy resource deployment is associated with storage systems for reliable and continuous energy supply. It is essential to keep developing more efficient storage units to advance environmentally friendly technologies. Despite extensive research and development efforts, an essential upsurge in energy storage capability is required to meet future demand. In the next generation of energy storage devices, supercapacitors (SCs) seem an excellent candidate for wearable and portable electronics compared to the flexible lithium-ion batteries-based technologies. Electrochemically excellent carbon materials are required to protect the environment and develop renewable energy sources, but they are scarce. Depending on the desired carbon morphology, there are many different types of biomasses and biowaste materials from which to choose carbon precursors. The preparatory work and characterization of newly found and evolved bio-based carbon sources are discussed and summarized in this study. Precursor and nanostructure types are listed in alphabetical order. New carbon precursors with excellent electrochemical performance in energy storage applications are also discussed. Ultimately, a conclusion and an outlook from the application perspective are drawn.

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Qamar Navid 
Department of Electrical Engineering, Faculty of Engineering and Information Technology, Technical University of Dortmund, Dortmund, Germany

Masoumeh Taali 
Department of Electrical Engineering, Faculty of Engineering, Shahid Rajaee Teacher Training University, Tehran, Iran

Mahdi Khosravy 
Cross Labs, Cross-compass Ltd., Tokyo, Japan

Mir Sayed Shah Danish 
Department of Electrical and Electronics Engineering, Faculty of Engineering, University of the Ryukyus, Okinawa, Japan

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Among the various types of metal organic frameworks (MOFs), the metal-oxide-based ones fulfill all the essential criteria such as strong bonding, organic linking units, and highly crystalline nature, properties required to be effective photocatalysts to serve environmental remediation. Moreover, the even spread of active sites and semiconductor properties make the MOFs ideal for absorbing irradiation from UV as well as visible light sources. Metal oxide composites with carbon based materials, especially, show high photocatalytic activity toward the degradation of organic dyes. Considering the relatively low cost of metal oxide semiconductors compared to pure metallic nanoparticles, metal oxide composites can provide a great alternative as photocatalysts especially considering the adjustable bandgaps and synergistic effects. Therefore, the metal oxide application as the photocatalysts in industry and technology in terms of techno-economic advantage is attracted. In this study, energy sustainability and solving carbon-related issues through metal oxide-based materials are discussed. This study aims to review metal oxide composites including metal oxide-MOFs and metal oxide-carbon material compositions as photocatalysts, application, merits in environmental and energy systems performances, and its contribution as an influential factor for sustainable development.

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Mir Sayed Shah Danish 
Strategic Research Project Center, University of the Ryukyus, Okinawa 903-0213, Japan

Tomonobu Senjyu 
Department of Electrical and Electronics Engineering, Faculty of Engineering, University of the Ryukyus, Okinawa 903-0213, Japan

Abdul Matin Ibrahimi 
Department of Electrical and Electronics Engineering, Faculty of Engineering, University of the Ryukyus, Okinawa 903-0213, Japan

Arnab Bhattacharya 
Department of Academic Affairs, Research and Education Promotion Association (REPA), Okinawa 900-0015, Japan

Zahra Nazari 
Department of Computer Science, Kabul Polytechnic University, Kabul 1006, Afghanistan

Sayed Mir Shah Danish 
Department of Electrical Engineering, Technical Teachers Training Academy (TTTA), Chihl Sutton, Kabul, Afghanistan

Mikaeel Ahmadi 
Department of Electrical and Electronics Engineering, Faculty of Engineering, University of the Ryukyus, Okinawa 903-0213, Japan

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The author(s) has received no specific funding for this article/publication.

In general terms, energy efficiency and conservation appraisal aspire to deliver an insatiable energy demand with less energy within the most significant amount of conservation and environmental benefits at the lowest possible price. Sustainable planning and design rely on a series of multi-disciplines: technical, technological, social, political, environmental, ecological, economic, institutional, and global restrictions that abstruse viable decision-making. Recent reports indicate that the residential building sector consumes 40% of the total energy and emits 30% of greenhouse gas (GHGs) worldwide. Thus accordingly, energy consumption in buildings is estimated at one-third of total primary energy resources. Therefore, proper modeling and optimization of a sustainable building in terms of energy efficiency and saving become a matter of focus. This paper explores an emerging picture of influential factors in the context of hands-on roadmap for energy-efficient and smart city planners, practitioners, scholars, and researchers. This study reviews the main points and proposes a framework in detail in the upcoming studies. Meanwhile, another objective of this paper was to introduce the most crucial indicators of energy-efficient building planning, design, and optimization to draw an exhaustive roadmap in compliance with resiliency, sustainability, and efficiency criteria throughout the lifecycle of a sustainable building.

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Mir Sayed Shah Danish 
Strategic Research Project Center, University of the Ryukyus, Okinawa 9030213, Japan

Tomonobu Senjyu 
Department of Electrical and Electronics Engineering, Faculty of Engineering, University of the Ryukyus, Okinawa 903-0213, Japan

Masooma Nazari 
Department of Electrical and Electronics Engineering, Graduate School of Engineering, University of Alberta, Alberta T6G 2R3, Canada

Hameedullah Zaheb 
Department of Electrical and Electronics Engineering, Faculty of Engineering, University of the Ryukyus, Okinawa 903-0213, Japan

Thabit Salim Nassor 
Department of Mechanical and Automotive Engineering, Karume Institute of Science and Technology (KIST), Mbweni Road, Zanzibar, Tanzania

Sayed Mir Shah Danish 
Department of Electrical Engineering, Technical Teachers Training Academy (TTTA), Chihl Sutton, Kabul, Afghanistan

Hedayatullah Karimy 
Department of Energy Engineering, Faculty of Engineering, Kabul University, Kabul 1006, Afghanistan

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The author(s) has received no specific funding for this article/publication.

Afghanistan hosts the Hindu Kush, an extension of the Himalaya mountains that act as water sources for five major rivers flowing through Afghanistan. Most of these rivers provide promise for the construction of water dams and installment of micro hydropower plants (MHP). Although civil war and political strife continue to threaten the country for more than four decades, the Afghan government introduced strategic plans for the development of the country. In 2016 Afghanistan introduced the Afghanistan National Peace and Development (ANPD) Framework at Brussels designed to support Afghanistan’s progress towards achieving the SDGs (Sustainable Development Goals). This study discussed the 7th Goal (ensuring access to affordable, reliable, and sustainable energy for all) and 8th Goal (promoting sustained, inclusive and sustainable economic growth, full and productive employment and decent work for all) alignment in Afghanistan. The Afghan government acknowledges its responsibility to provide electricity for all of its citizens, but this can only be achieved if the government can secure a reliable source of energy. Afghanistan’s mountainous terrain provides a challenge to build a central energy distribution system. Therefore this study looks for alternative solutions to the energy problems in Afghanistan and explores feasibility of micro-hydropower plant installations in remote areas. This study evaluated socio-economic impacts of micro-hydropower plants in the life of average residents. We focused on one example of a micro hydropower plant located in Parwan, conducted interviews with local residents, and gathered on-site data. The findings in this study can help policymakers to analyze the effects of development projects in the social and economic life of residents. It will encourage the government and hopefully the private sector to invest in decentralized energy options, while the country is facing an ever-growing energy demand.

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Mohammad Airaj Firdaws Sadiq 
Department of Energy Engineering, Faculty of Engineering, Kabul University, Kabul, Afghanistan

Najib Rahman Sabory 
Department of Energy Engineering, Faculty of Engineering, Kabul University, Kabul, Afghanistan

Mir Sayed Shah Danish 
Strategic Research Projects Center, University of the Ryukyus, Okinawa, Japan

Tomonobu Senjyu 
Department of Electrical and Electronics Engineering, Faculty of Engineering, University of the Ryukyus, Okinawa, Japan

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3. [3] Danish MSS, Sabory NR, Danish SMS, Senjyu T, Ludin GA, et al. (2017) “Electricity Sector Development Trends in an After-war Country: Afghanistan Aspiration for an Independent Energy Country” Journal of Energy and Power Engineering (vol. 11, no. 1, pp. 553–557) https://doi.org/10.17265/1934-8975/2017.08.007
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The author(s) has received no specific funding for this article/publication.

Afghanistan is one of the developing countries in South Asia with an enormous renewable and nonrenewable energy resources. Since 1893, utilization of secondary (modern) form of energy in Afghanistan has been pursued. The trends of sustainable energy provision have been reinforced after the post-conflicts in Afghanistan. The Sustainable Development Goal-7 (affordable and clean energy access) encourages nations to assess their resource development of renewable, affordable, and accessible energy. Unlike many developing countries that struggle to identify domestic sources of clean, sustainable energy, Afghanistan has hydro, solar, wind, and geothermal resources as assets. This literature review analyzes Afghanistan’s potential for renewable energy to identify obstacles and challenges like security, economics, and technology. Using surveys conducted by national and international organizations. This research evaluates Afghanistan’s progress in meeting SDG-7, identifies the main barriers for renewable energy development, and offers recommended solutions. This study reveals the facts of energy sector development in Afghanistan to enable students, researchers, and practitioners with an overview of the current situation and future direction of the energy sector. Also, this study offers a concise outlook for energy sector investors and donors at the national and international stages.

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Ahmad Khalid Slimankhil 
Department of Energy Engineering, Faculty of Engineering, Kabul University, Kabul, Afghanistan

Mohammad Abed Anwarzai 
Department of Energy Engineering, Faculty of Engineering, Kabul University, Kabul, Afghanistan

Najib Rahman Sabory 
Department of Energy Engineering, Faculty of Engineering, Kabul University, Kabul, Afghanistan

Mir Sayed Shah Danish 
Strategic Research Projects Center, University of the Ryukyus, Okinawa, Japan

Mikaeel Ahmadi 
Department of Electrical and Electronics Engineering, Faculty of Engineering, University of the Ryukyus, Okinawa, Japan

Mohammad Hamid Ahadi 
Department of Academic Affairs, Research and Education Promotion Association (REPA), Okinawa, Japan

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The author(s) has received no specific funding for this article/publication.

Cities are predicted to host 80 % of the populations by 2050 considering the current urbanization rate. It is inevitable. No choice is left to us but to keep our cities clean and livable. Efficient use of energy is tightly linked with the smart cities. Looking at the technology development trends and the extensive need for efficient use of energy, cities must be transforming to smart ones in order to keep them clean and livable for this and generations to come. Kabul city population has been growing so rapidly and also expanding widely to its outskirts in the last two decades. Environmental footprints have been so significant and diverse. One of the critical issues with Kabul city has been the access to clean and abundant sources of energy. At the same time, lack of a master plan for its future has made this city in the danger of becoming empty from the habitants in few decades. This is very important to draw future now. Develop a new vision for our cities that is meeting the requirements of future. Kabul city needs one badly. One important area of a city to be discussed is its energy demand, supply and consumption. In this research, energy demand, sustainable sources of energy supply and consumption are thoroughly discussed. Based on our key assumption, livable and clean Kabul, all the other parameters are analyzed and suggested. In specific, we have discussed the energy demand for electricity, heating & cooling of buildings, transportation and industry. It is also assumed that Kabul will be modern and smart city with state of the art technology available all around it. Key data and references for this research are: 1. Sasaki Urban Design Framework for Kabul city, 2. Previous master plans of Kabul city, 3. Energy strategies and outlooks for Afghanistan, 4. Sustainable Development Goals (SDGs) and many other guidelines internationally used for urban planning and design. This research will help policy makers, urban planners and designers, municipality authorities, other urban issues related sectors to work jointly and make smart and rational decisions for the capital of Afghanistan and save it from going abandoned.

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Najib Rahman Sabory 
Department of Energy Engineering, Faculty of Engineering, Kabul University, Kabul, Afghanistan

Mir Sayed Shah Danish 
Strategic Research Projects Center, University of the Ryukyus, Okinawa, Japan

Tomonobu Senjyu 
Department of Electrical and Electronics Engineering, Faculty of Engineering, University of the Ryukyus, Okinawa, Japan

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The author(s) has received no specific funding for this article/publication.