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Wind energy shows considerable promise for the future. Doubly fed induction generators (DFIGs) are attracting much attention in wind energy systems due to their unique advantages, including a reduced size power converter, as well as versatility in the independent control of active and reactive power. It is important to determine the precise output energy from the DFIG, particularly when the output...
Developing long-term forecasts for unconventional oil, gas and condensate production has challenged both analysts and academics because the shale revolution is still in its relatively early stages. Initial estimates of URR (ultimately recoverable reserves) in the Eagle Ford appear to have been too low. In this paper, forecast accuracy using limited early data of oil and condensate production in the...
Recently China has brought out several incentive policies to break high-cost limitation and stimulate investment in photovoltaic industry. Under this favorable policy environment, PV power is undoubtedly facing enormous development opportunities. Firstly, after analyzing current policy environment and interactions between involved variables, a simulation model of China's PV power development was built...
Field and laboratory trials of the energy crop species Virginia mallow (Sida hermaphrodita L. Rusby) and cup plant (Silphium perfoliatum L.) were conducted to evaluate the effects of liming and nitrogen application on biomass and energy productivity and the suitability of the biomass for biofuel production. Independent of the growing year, the average DM (dry mass) yields of cup plant and Virginia...
VAWT (Vertical axis wind turbines) pose several advantages over the horizontal axis machines that make them more suitable for applications where wind conditions are inherently turbulent. However, due to the complexity of VAWT aerodynamics, technical literature on the subject is very limited with research on VAWT performance mostly focused on steady wind analysis. This paper aims to numerically predict...
This paper deals with a furnace which its fuel (gas oil) is replaced by natural gas in such a way that the flue gas temperature and the rate of heat removal from the furnace are remained unchanged. The question now is: what are the benefits due to replacement of the fuel of the furnace? The objective of this work is to answer this question. Modeling the furnace similar to a continuous flow stirred-tank...
We report here a method of synthesizing MgH2–Fe3S4 composite with a series of remarkable hydrogen storage properties. For instance, compared to pure MgH2, three times higher hydrogen absorption weight (3.41 wt.% vs 0.98%) and two times faster hydrogen desorption rate (4.01 wt.% vs 2.32 wt.%) are seen in MgH2–Fe3S4 composite. Furthermore, the dehydrogenation temperature of MgH2 is also found to be...
This paper evaluates the economic feasibility of SPCC (solar-assisted post-combustion carbon capture) at a coal power plant near Sydney, Townsville and Melbourne for implementation in 2020. A review of Australia's carbon and renewable energy policy is performed first, after which the merits of application of each incentive for SPCC are compared. Incentives such as subsidies, preferential discount...
Energy and exergy efficiencies of the wheat and rye bread and hamburger bun making processes are assessed based on data from Turkey and Germany. Amount of the land required to produce the same amount of wheat in Turkey is 3.34 times of that required in Germany; this ratio is 2.30 for the rye grain. These results show that the efficiency of the conversion of the solar energy into the grain mass is...
This study is for the technoeconomic analysis of an integral facility consisting of wind energy-based electrolytic hydrogen production, bioethanol-based carbon dioxide capture and compression, and direct methanol synthesis. ASPEN Plus was used to simulate the facility producing 97.01 mt (metric tons) methanol/day using 138.37 mt CO2/day and 18.56 mt H2/day. A discounted cash flow diagram for the integral...
Rising concerns about pro-environment and energy conservation bring about the escalating interests in adsorption cooling systems using renewable energy. Adsorption chillers with common refrigerants (water, ethanol, methanol, etc.) face the problem that advanced technologies and intricate design considerations are required to maintain high vacuum. This paper aims at the parameters optimization of adsorption...
Economic optimal control has been a major concern in modern power plant. The HMPC (hierarchical model predictive control) incorporates both the plant-wide economic process optimization and regulatory process control into a hierarchical control structure, in which the model predictive control technology has been an effective tool for solving the higher-layer economic optimization problems. Since the...
TSA (total site analysis) has shown to be an efficient tool for identifying heat integration measures in industrial clusters, leading to the optimal design of utility systems and energy bill reduction. In order to justify investments, any proposed utility system must be shown to be able to operate in all configurations that an industrial cluster can encounter, especially those relating to varying...
Global competition for crude oil has increased in the past decade with the entry of industrializing nations such as China and India. Yet we still do not know much about the spatial structure of crude oil commodity trade and its evolution over time. In this paper, we apply complex network analysis to examine the geography of global crude oil flows and its evolution based on the United Nations commodity...
Exergetic analysis of a reverse osmosis desalination unit is performed for brackish water feed using different energy recovery methods. This includes single and two-stage pressure retarded osmosis units (for infinite area). The correct definition of exergetic efficiency for such systems is also discussed. A clear connection is seen between specific energy consumption and the efficiency definition...
In this work, the artificial neural network model was developed to predict the energy performance of a photovoltaic-thermal evaporator used in solar assisted heat pumps. The experiments were carried out under the meteorological conditions of Coimbatore city (latitude of 10.98°N and longitude of 76.96°E) in India. The energy performance parameters of a photovoltaic-thermal evaporator such as, evaporator...
Thermoacoustic engines attract much attention for their lack of moving parts and relatively benign environmental impact. In this review, an introduction of the thermoacoustic effect is supported by a summary of related theoretical models for thermoacoustics. An overview of the current research and experimental prototypes including typical thermoacoustic prime movers, thermoacoustic refrigerators,...
A novel solar based multigeneration system including thermoelectric generator is developed and analyzed energetically and exergetically. A unique cooling system of PV (photovoltaics) panels incorporating thermoelectric generator and cooler is developed to improve the efficiency. An exclusive integration of thermoelectric devices with multigeneration system is designed to increase the energy and exergy...
VIPs (vacuum insulation panels) with super-stratified glass fiber core material were prepared by CSB (centrifugal-spinneret-blow) process. The fiber orientation of the super-stratified glass fiber core material was concentrated in the X–Z plane which was perpendicular to the heat transfer direction. The initial thermal conductivity of this novel VIPs was only 1.25mW/(m K) which performs up to two...
Rare earth metal doped HTLPs (hydrotalcites-like precursors) were successfully synthesized by co-precipitation method. The prepared HTLPs were characterized by FE-SEM (field emission scanning electron microscopy), EDX (energy dispersive X-ray spectrometer), Fourier transform infrared spectroscopy (FT-IR), XRD (X-ray diffraction), BET (Brunauer–Emmett–Teller) technique. BET surface analysis results...
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