Showing papers in "Energy Conversion and Management in 1999"

TL;DR: In this paper, the authors present various applications of neural networks in energy problems in a thematic rather than a chronological or any other order, including modeling the heat-up response of a solar steam-generating plant, estimation of a parabolic trough collector intercept factor, and the estimation of the local concentration ratio.

TL;DR: A comprehensive review of the various designs, details of construction and operational principles of the wide variety of practically-realised designs of solar-energy drying systems reported previously is presented in this article.

TL;DR: In this paper, a carbon dioxide removal and liquefaction system, which separates carbon dioxide from the flue gases of conventional power plants, was modelled and the effect of the main parameters on the absorption and stripping columns was presented, with the main constraints set for the model are a capture efficiency of 90% and the use of an aqueous solution with a maximum 30% amine content by weight.

TL;DR: In this article, the current status of EV energy sources and their suitability and potentiality are reviewed, and the concept of multiple energy sources for EVs is identified, hence the corresponding near term and long term measures are discussed.

TL;DR: The concept of injecting carbon dioxide, from the burning of fossil fuels, into coal-beds to remove methane has been proposed in this paper, with the dual result of increasing the production of methane, a more environmentally friendly fossil fuel than coal or oil, and using waste carbon dioxide to a useful purpose.

TL;DR: A comprehensive review of the fundamental principles and theories governing the drying process is presented in this paper, where the development of contemporary models of drying of agricultural products are traced from the earliest reported sorption and moisture equilibrium models through the single kernel of product models to the thin layer and deep bed drying analyses.

TL;DR: In this paper, the authors compared the performance of ejector refrigeration systems with water, halocarbon compounds (CFCs, HCFCs and HFCs), cyclic organic compound (COC), and an azeotrope.

TL;DR: In this paper, the Structural Theory of Thermoeconomics is proposed as a standard and common mathematical formulation for all thermoeconomic methodologies that can be expressed by linear equations.

TL;DR: In this paper, the authors evaluated Turkey's renewable energy source potential and their present use based on the available data and found that Turkey's geographical location has several advantages for extensive use of most of these sources.

TL;DR: In this paper, a review of flat-plate solar-energy air-heating collectors for low temperature (i.e. temperature elevations between 10°C-35°C above ambient) solar energy crop drying applications is presented.

TL;DR: In this paper, the authors used a closed air cycle type, in which air is circulated in the unit by natural draft between the humidifier and condenser, and found that the air circulation rate increased with water flow rate, causing a further increase in the mass transfer coefficient.

TL;DR: In this article, the reaction of a mineral carbonate, such as limestone, with water and CO 2 to form bicarbonate in solution, is explored as a CO 2 mitigation strategy.

TL;DR: In this article, the effects of both internal and external irreversibilities of the cycle were analyzed using a mathematical model based on the first law of thermodynamics for processes with finite speed, with particular attention to the energy balance at the receiver.

TL;DR: In this paper, the effect of geographical and meteorological parameters on the monthly mean global solar radiation in Elazig was investigated using a multiple linear regression model, and the results showed that these equations, which express the 99th percentile of the incident solar radiation, have a −9% deviation from the measured values.

TL;DR: In this paper, the environmental impact of electric power production through an Integrated Gasification Combined Cycle (IGCC) fired by dedicated energy crops (poplar Short Rotation Forestry (SRF)) is analyzed by a Life Cycle Assessment approach.

TL;DR: In this article, the authors developed a mathematical model to describe the pyrolysis of a single solid biomass particle, where both physical and chemical changes are controlled by heat transfer phenomena.

TL;DR: In this article, the phase change material within a finned heat pipe latent heat thermal storage system is studied by means of an analytical technique considering the radial heat propagation toward the heat pipe wall and the angular heat propagation towards the fin.

TL;DR: In this article, a two-dimensional model for the phase change, conduction based heat transfer problem around a tube immersed in the pcm is presented, where the energy equation is written in the enthalpy form, and the heat and flow problems are coupled by an energy balance on the fluid element flowing inside the tube.

TL;DR: In this paper, a simulation program was constructed in which the set of non-linear equations describing the desalination unit were solved numerically, and the simulation allowed the proper choice of the feed water flow rate to the unit.

TL;DR: In this paper, the effects of the briquetting pressure on the density, moisture content and compressive strength of wheat straw briquettes were examined at six different pressures (300, 400, 500, 600, 700 and 800 MPa).

TL;DR: In this paper, a mathematical model for predicting the low temperature exergy, pressure exergy and total cold heat exergy of Liquefied Natural Gas (LNG) is developed, where the liquid mixture densities are calculated by a shape factor Corresponding State method, Vapor-Liquid-Equilibrium data of LNG are predicted by an improved method and the influences of real fluid effects are considered.

TL;DR: In this paper, a new kind of finite time thermoeconomic optimization for an endoreversible refrigerator and a heat pump was proposed, where the cooling load for the refrigerator and the heating load of the heat pump per unit total cost were proposed as objective functions for the optimization.

TL;DR: In this paper, the heat transfer and friction characteristics of a decaying swirl flow were investigated experimentally and the results were correlated in the form of Nusselt number as a function of Reynolds number, Prandtl number and the vane angle as Nu=0.133Re0.65Pr0.4(1+tan θ)0.406

TL;DR: A transient analysis of a double basin solar still has been presented in this article, where explicit expressions have been derived for the temperatures of various components of the inverted absorber double-basis solar still and it's efficiency.

TL;DR: In this article, the performance of the combined solar-heat pump system with energy storage in encapsulated phase change material (PCM) packings for residential heating in Trabzon, Turkey, was constructed.

TL;DR: In this article, the current status of knowledge regarding heat transfer phenomena in automotive exhaust systems is summarized and analyzed by means of a comprehensive transient computer model covering all exhaust piping configurations (single wall, double wall with air gap or insulation).

TL;DR: In this paper, five identical test structures have been fabricated for studying passive techniques for better comfort conditioning in arid areas, and the fall in roof and ambient temperatures inside the test structures were in increasing order for roofs treated with thermal insulation, painted with white paint, shallow pond with movable thermal insulation and evaporative cooling.

TL;DR: In this paper, the transient thermal behavior of wickless heat pipe flat plate solar collectors has been analyzed with regard to various parameters, such as global solar radiation intensity, inlet cooling water temperature, absorber plate material and thickness, ratio of pitch distance to WSP diameter and ratio of condenser section length to total WSP length.

TL;DR: In this article, a simple algebraic formula for estimating optimum insulation thickness for refrigeration applications is presented, and the effects of design parameters on the optimal insulation thickness are investigated for three test cities using an interactive computer code written in Fortran 77.

TL;DR: In this paper, the performance of single, double and triple solar still located in Amman was analyzed. And the authors found that the distilled water output of the triple basin was 24% higher than that of the single basin and 5.8% more than the double basin.