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The design methodology available in the literature for downdraft gasifiers of large capacity (∼40–600 kWth) is not directly applicable to very small sized gasifiers. In the present work, design and development of small downdraft gasifiers of 4 kWth and 2.5 kWth nominal capacities, for domestic cookstove application, have been carried out by non-linear extrapolation of data in literature for large...
Generation scheduling of combined heat and power extends the traditional power generation scheduling by satisfying the thermal load in parallel with the electrical load; the integration of storages into the system further improves the economic efficiency of the traditional generation scheduling. Such combined heat and power scheduling of the dispatchable generators and storages, which incorporates...
Considering the importance of clean energy, the combined operation of hydro-thermal-wind (HTW) system is formulated in optimal power flow (OPF) framework. The objective is to find an optimal generation schedule for the HTW system where the system will work economically and in a voltage secure manner with reduced loss during normal as well as stressed system operation. As system voltage may be vulnerable...
In diesel engine lubricants, over-based detergent additives are typically used to neutralize acids. These additives are required for long service life, but their use results in hazardous emissions, which mainly include sulfur and ash content. To address this problem, this study investigates the detergent-free bio-based lubricant conditioning approach by using a chemically active oil filter. A standard...
The aim of this research is to investigate the pollution haven hypothesis (PHH) in Ghana utilizing CO2 emission as an indicator of air pollution for the period of 1980–2012. Moreover, we utilized gross domestic product (GDP), GDP square, energy consumption, renewable energy consumption, fossil fuel energy consumption, foreign direct investment, institutional quality, urbanization and trade openness...
Dynamics of an energy harvesting device based on Magnetostrictive material (MSM), Metglas, subjected to low frequency base excitation is studied. The model consists of a steel based cantilever beam laminated by Metglas as a MSM throughout the length. The cantilever beam is surrounded by a pickup coil on which electrical current is induced due to the magnetic field according to Faraday's law. The governing...
Due to the nature of fluctuation and intermittence, integration of renewable energy sources (RESs) requests more flexibility of power systems. However, the “heat-led” operation mode limits the adjustability of combined heat and power (CHP) plants, and reduce the accommodation of RESs. This paper studies an integrated thermal and power system and introduces a phase-change heat storage (HS) facility...
Thermoelectric materials play a significant role in energy production and utilization for the near future. However, the temperature-dependent material properties including thermal conductivity, electric resistivity and Seebeck coefficient make the theoretical analysis challenging. In this work, we propose an approximate analytical solution, in which we evaluate the distribution of the electric resistivity...
There is a rapid growing interest in using biomass as an alternative source for clean and sustainable energy production. In this work, a hybrid system was developed to combine anaerobic digestion (AD) and gasification for energy recovery from yard waste and woody biomass. The feasibility of the proposed hybrid system was validated experimentally and numerically and the energy efficiency was maximized...
In this paper, we perform a comprehensive parametric study for supercritical CO2 (sCO2) Brayton cycle integration with a concentrated solar thermal (CST) plant. The main focus is to develop operational strategies for the cycle to adapt to fluctuations in solar energy availability. Several cycle layouts are analysed and a ‘combined’ cycle comprising recompression, reheat and intercool is found to be...
In this study, performance analyses of a gas turbine with two intercoolers and two re-heaters based on energetic, exergetic and ecological concepts such as power, power density, second-law efficiency (exergy efficiency), exergy destruction, ecological coefficient of performance (ECOP) and effective ecological power density (EFECPOD). The effects of turbine design parameters such as turbine speed,...
Optimum design of the Heat Recovery Steam Generator (HRSG) has noticeable effects on the thermal efficiency of the combined cycle power plants. In this paper, constructal design of a dual pressure HRSG is proposed. It is shown how to simultaneously optimize the operating and geometric design parameters of the HRSG by using the constructal theory. Considering the minimum total entropy generation as...
Battery energy storage (BES) plays an important role in the integration of intermittent renewable power and distributed generation. The price arbitrage is a major source of energy storage income. In China, the electricity price is tightly regulated by the government. It's interesting to find out whether the BES is economic viability in such a special electricity market, and what's the optimal response...
Interconnected electricity networks, or Supergrids, are considered as a possible solution to tackle challenges associated with near and far-future supply of electricity. These include, but are not limited to, reducing Green House Gas emissions and reliance on non-renewable fossil fuels. Supergrids can help to tackle these challenges, for example, by providing a reliable interconnection platform for...
A precise prediction of the power generation capacity of each power plant in an electric grid is important for managing the grid stably by preventing mismatch between the electric demand and power production. This prediction also helps power plant owners maintain their facilities because it allows effective performance monitoring. This paper proposes a unique analysis tool for predicting the near-term...
Increasing energy demand triggered by industrialization has led to high carbon dioxide (CO2) emission into the environment, causes rise in earth temperature resulting in global warming. Therefore, there is urgent need to develop a cost effective methods and materials for its sequestration from point source and reduce its impact on the environment. This paper reviewed the recent development in functionalized...
Buildings consume approximately half of the annual energy supply of the United States in their construction and operation. To effectively decrease this extensive energy footprint, both embodied and operating energy must be quantified and optimized. Although validated standard methods are available to compute operating energy, quantifying embodied energy is still complicated and inconsistent. Among...
Cyclic stability is a key factor in the design of thermochemical heat storage systems. Because carbon dioxide (CO2) may react with heat storage materials and lead to a decrease in energy storage efficiency, the effect of CO2 on Ca(OH)2/CaO and Mg(OH)2/MgO systems is investigated in this study. The experimental results show that CO2 reacts with CaO in the water vapor that appears during the heat release...
Drawing on basic physics, Kummel [24] and Beaudreau [4,5] attributed the productivity slowdown to the OPEC price-hike-led decrease in the rate of growth of energy consumption in the mid-1970s. The high post-WWII energy use growth rates observed in most OECD countries fell drastically, decreasing productivity and GDP growth. However since, considerable doubt has been cast on this view. For example,...
CO2 capture, utilization and storage (CCUS) is a significant strategy to mitigate climate change. Various capture technologies have been investigated in the last decades, such as absorption, adsorption, membrane and cryogenic, etc. However, energy penalty is considered as the major challenge for the existing techniques. One of the potential alternatives to overcome this challenge is the integration...
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