The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Using the test system for the microwave pyrolysis of scrap tires, the effects of different factors on the production characteristics of limonene in oils were investigated. The results showed that the optimum processing parameters for the production of limonene were the specific microwave power of 15 W/g, the weight hourly space velocity of 3.75 h−1, the tire particle size of 0.6 mm, and the absence...
Short-term electricity load forecasts and long-term projections of climate change impacts can benefit from understanding the relationship between electricity demand and meteorological conditions. We developed and applied a segmented regression technique to more than ten years of hourly electricity load data to estimate this relationship in two transmission zones in the United States that vary in their...
Based on the current models of an alkaline fuel cell (AFC) and a thermally regenerative electrochemical cycle (TREC), a novel model of the hybrid system consisting of an AFC, n TRECs, and a regenerator is proposed. The maximum power output density of the hybrid system is calculated. It is found that when the regenerative efficiency of TRECs is in the 0.4–0.8 range, the maximum power output density...
The objective of this study was to evaluate the effectiveness of extrusion on cell disruption of a marine alga Nannochloropsis oceanica with a single-screw extruder for the production of intracellular valuables. The effect of operating parameters including feed moisture (15–24%) and screw rotation speed (300–450 rpm) was also determined. Experimental results demonstrated that extrusion was effective...
The purpose of this research is to use a wavelet neural network (WNN) and stochastic gradient algorithm (SGA) to predict the performance and exhaust emissions of a compression ignition engine with nanoparticles-diesel fuel. The percentage of the additive of nanoparticles to the fuel ranges between 20 and 80 ppm. A model of WNN has been applied in order to predict the relationship between the power,...
In the current context, climate change has become an unequivocal phenomenon. Although it primarily encompasses change in temperature, nevertheless other weather variables such as rainfall, wind speed, evaporation and humidity can also be affected as a result of climate change. Addressing the impacts of climate change on electricity demand is essential for predicting the future demand. For example,...
The energy benchmarking has been recognised as an effective analytical methodology and a significant management tool that helps to improve the efficiency and performance of the energy utilisation. Studies on energy benchmarking has been worldwide carried out in many areas for different objectives. However, there are few systematic theories to support the development of a reasonable energy benchmarking...
Apostolaki-Iosifidou et al. [1], published in the May edition of Energy, is an important contribution to the field of vehicle-to-grid (V2G). It is the first publication to document the roundtrip efficiency of V2G, a critical element for assessing its economic viability. Roundtrip efficiency was found to range between 53% and 62%. This contrasts with existing V2G economic analyses, which either assume...
In this study, a parametric three dimensional computational fluid dynamics (CFD) analysis of solar chimney power plant was performed to illustrate the effects of collector's slope and chimney diverging angle on performance of Manzanares prototype. Numerical models were incorporated with solar load, DO (discrete ordinates) and RNG k-ɛ turbulence models. Firstly, CFD simulations results were validated...
In this study we estimate the final and primary energy savings for different energy efficiency measures in a multi-apartment building when heated by small-, medium- or large-scale district-heat production systems (DHSs). The small-scale system is based on heat-only boilers, whereas the other two also include cogeneration of district heat and electricity. In the systems with cogeneration units, a change...
This article describes an analysis of both a binary and a conventional Rankine cycle for a coal-fired power plant. The major question is whether it is possible to compensate the expected higher capital investment associated with additional components by a lower fuel consumption during the operation.By implementing an exergy analysis, the concept of a binary Rankine cycle with potassium and water as...
Non-thermal Plasma Synergistic Catalysis (NPSC) was firstly proposed and employed in the upgrading of biomass pyrolysis vapors for preparation of biofuels. The effects of the three-way catalysis (non-thermal plasma, HZSM-5 body and modified components) on the bio-oil upgrading performance and catalyst stability were comprehensively investigated. Bio-oil yields continued to decrease, but the physicochemical...
In this study, in-situ experiments and numerical simulations were used to study the heat transfer characteristics of a heat exchange system, a vertical deep-buried U-bend pipe with a buried depth of >2000 m to supply heat to buildings in Xi'an using geothermal energy. The in-situ experimental conditions include a constant inlet temperature and water flow rate in the deep-buried pipe, and the inlet...
In a 7-year study, we assessed the conservation agriculture (CA) practices [permanent bed (PB) and zero tillage (ZT)] and conventional till (CT) in 4-diversified maize rotations [maize-wheat-mungbean (MWMb), maize-chickpea-Sesbania green manure (MCS), maize-mustard-mungbean (MMuMb) and maize-maize-Sesbania green manure (MMS)]. Results showed that ZT and PB plots consumed lower energy (7 yr average)...
Waste printed circuit boards (WPCBs) contain abundant metals. Recovering WPCBs is significant in energy conservation, sustainable development, and environmental protection, which save the energy and environment cost of searching and melting of metals. Many reports were related to environment-friendly disposal of basal boards of WPCBs. Little information was reported about the recovery technology of...
In this study, conventional and advanced exergy analyses have been executed on a simple flat plate collector and a flat plate collector with thin metal sheet. Mathematical models have been designed using energy balance equations developed for each component. The results of the present work are well in agreement with those of previous researchers. The effects of Reynolds number, channel depth and radiation...
Fluctuations in individual renewable-energy supplies are largely reduced by distributing the renewable energy over a wide-area transmission network. Therefore, a new analysis algorithm for determining the amount of renewable energy in a wide-area transmission network was developed in this study. Accounting for the power interchange in the transmission network and the energy storage in electric heat...
This paper presents a robust method for assessing the efficiency of organic Rankine cycle (ORC) plants based on the molecular structures of the working fluids employed. The developed methodology uses molecular group contribution methods and does not require equations of state or extensive experimental data. The maximum utilization efficiency ɳu* of an ORC plant was correlated with two thermodynamic...
Due to humanity's huge scale of thermal energy consumption, any improvements in thermal energy management practices can significantly benefit the society. One key function in thermal energy management is thermal energy storage (TES). Following aspects of TES are presented in this review: (1) wide scope of thermal energy storage field is discussed. Role of TES in the contexts of different thermal energy...
In this study, the effects of heat transfer enhancement on engine performance by introducing slot grooves on walls of the displacer cylinder of a γ-type medium-temperature-differential Stirling engine have been investigated using computational fluid dynamics. Cases include smooth displacer-cylinder wall with heat source and heat sink extension on displacer cylinder circumferential wall and slot-grooved...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.