Showing papers in "Energy in 2004"

TL;DR: In this article, an analysis of the performance of organic Rankine cycle (ORC) subjected to the influence of working fluids is presented, which reveals that the thermal efficiency for various working fluid is a weak function of the critical temperature.

TL;DR: In this article, the authors present the first results of an investigation carried out by the authors on the potentialities of biodiesel as an alternative fuel based on strategic considerations and field experiences in boilers and diesel engines.

TL;DR: In this article, an engineering study was carried out to evaluate a concept where another (less expensive) liquid medium such as molten salt is utilized as storage medium rather than the heat transfer fluid (HTF) itself.

TL;DR: In this paper, the main variations are in gasification pressure, the oxygen or air medium, and in optimisation towards liquid fuels only, or towards the product mix of liquid fuels and electricity.

TL;DR: In this paper, the results of the seismic interpretation are shown, supported by synthetic seismic modelling and reservoir flow simulation of the migrating CO2 at the two different time-steps, which provides insights into the migration of the CO2.

TL;DR: The Sleipner project is the first commercial application of CO2 storage in deep saline aquifers in the world as discussed by the authors, and 3D seismic surveying has been used to successfully monitor the CO2 in the Utsira formation.

TL;DR: In this article, the authors use 3D images of fault surfaces or in 2D projections to identify fault orientations, ambient pore fluid pressures and in situ stresses in a potential storage site.

TL;DR: In this paper, the feasibility of utilizing a molten salt as the heat transfer fluid (HTF) and for thermal storage in a parabolic trough solar field to improve system performance and to reduce the levelized electricity cost was investigated.

TL;DR: In this article, the experimental work on a variety of porous materials is reported, including extruded monoliths with parallel channels and thin walls made from various oxide and non-oxide ceramics, ceramic foams and metal structures with the objective of applying them as open volumetric receivers in concentrated solar radiation.

TL;DR: In this paper, a summary of the main results and conclusions achieved in the DISS (Direct Solar Steam) project is presented, where the feasibility of the DSG process in horizontal parabolic trough collectors has been proven and an important know how has been acquired by the project partners regarding the thermo-hydraulic parameters of the water/steam flow in DSG solar fields.

TL;DR: In this paper, the authors draw some generic conclusions on reservoir characterization based on the Sleipner operation where CO2 is being injected into the Utsira Sand, which can radically affect CO2 migration within the aquifer.

TL;DR: In this paper, a thermal system design can be optimized using energy, economy and environment as separate objectives, and an evolutionary algorithm is used to find the surface of optimal solutions in the space defined by the three objective functions.

TL;DR: In this paper, the results of a collaborative effort under the International Energy Agency SolarPACES organization to address these questions and it shows the potential environmental and economic benefits of each configuration.

TL;DR: In this article, the phase diagram of the binary system of tetradecane and hexadecANE has been used to obtain information of the phase transition processes for cool storage applications.

TL;DR: An overview of the research work that is currently underway and an analysis of the current state of knowledge on geological storage of CO 2 is provided in this paper, where the analysis is broken down to address the key geological storage options: deep coal seams, depleted hydrocarbon reservoirs and deep saline aquifers.

TL;DR: In this paper, the effect of pyrolysis conditions on product yields and bio-oil composition when the heating rate was 5 K/min was used. But, the results showed that the biooil yield reached a maximum value of 35.86% with the steam velocity of 2.7 cm/s.

TL;DR: In this paper, numerical simulators were used on a suite of test problems for CO 2 disposal in saline aquifers and depleting oil and gas reservoirs and the results reveal broad agreement in most areas, but also points out sensitivities to fluid properties and discretization approaches that need further study.

TL;DR: In this paper, the authors draw upon the experiences that can be gained from the existing CO2 pipeline networks to derive estimates of the risk of CO2 releases from CO2 transmission pipelines; the results show that such pipelines do not represent a significant risk in terms of potential for release.

TL;DR: In this article, the authors present a full cost approach to determine the levelized cost of energy (LCOE) of 14 electricity generation technologies, including those that are traditionally omitted from economic evaluations of generation technologies.

TL;DR: In this paper, the authors discuss recent developments in the calibration of broadband solar radiometric instrumentation and improving broadband solar radiation measurement accuracy, including an improved diffuse sky reference and radiometer calibration and characterization software for outdoor pyranometer calibrations.

TL;DR: Aqueous liquefaction of Cunninghamia lanceolata, Fraxinus mandshurica, Pinus massoniana Lamb and Populus tomentosa Carr was carried out in an autoclave in the reaction temperature range of 553.15-633.15 K as discussed by the authors.

TL;DR: In this paper, the authors explored the quantitative effect on energy use and carbon dioxide (CO 2 ) emissions if households were to adopt "green" consumption patterns, and showed that green consumption patterns generally reduce energy consumption and CO 2 emissions.

TL;DR: In this paper, a multiple objective mixed integer linear programming model for power generation expansion planning is presented, which allows the consideration of modular expansion capacity values of supply-side options, and demand-side management is also considered an option in the planning process, assuming there is a sufficiently large portion of the market under franchise conditions.

TL;DR: In this paper, a multi-attribute decision-making evaluation of energy resources that will enable the selection of a suitable electricity generation alternative for Turkey is presented, and an integrated decision aid (IDEA) framework is presented for selecting the most suitable multidimensional method.

TL;DR: The Weyburn Oil Field, Saskatchewan is the site of a large (5000 tonnes/day of CO 2 ) CO 2 -EOR injection project by EnCana Corporation as mentioned in this paper.

TL;DR: Akbari et al. as discussed by the authors analyzed the effect of heat island reduction strategies on annual energy savings and peak power avoidance of the building sector of the Greater Toronto Area, using an hourly building energy simulation model.

TL;DR: In this article, an approach to predict the nitrogen oxides (NOx) emission characteristics of a large capacity pulverized coal fired boiler with artificial neural networks (ANN) was introduced.

TL;DR: The Bayesian framework for ANN, named as automatic relevance determination method (ARD), was employed to obtain the relative relevance of a large set of atmospheric and radiometric variables used for estimating hourly direct solar irradiance, proving the reliability of the ARD method.

TL;DR: In this paper, the thin layer convective solar drying and mathematical modeling of prickly pear peel was presented, and the experimental drying curves showed only a falling drying rate period. But the main factor in controlling the drying rate was found to be the drying air temperature.

TL;DR: In this paper, the authors examined the energy consumption of greenhouse gas separation by clathrate hydrates and showed that the hydrate process is preferable to the liquefaction process in terms of energy consumption.