Showing papers in "Energy in 2005"

TL;DR: In this paper, the ability of different energy systems and regulation strategies to integrate wind power is expressed by the following three factors: the degree of electricity excess production caused by fluctuations in wind and Combined Heat and Power (CHP) heat demands, the ability to utilise wind power to reduce CO2 emission in the system, and the benefit from exchange of electricity on the market.

TL;DR: In this article, the authors presented the results of a life cycle analysis (LCA) of greenhouse gas emissions from power generation systems in order to understand the characteristics of these systems from the perspective of global warming.

TL;DR: In this article, the change of aggregated CO2 in China from 1957 to 2000 based on a complete decomposition approach was analyzed using the logarithmic mean divisia index (LMDI) method.

TL;DR: In this paper, the authors used the transition matrix approach of the Markov chain process to generate wind speed time series from two meteorological stations in Malaysia, and compared the observed wind speed and the synthetically generated ones.

TL;DR: Gas turbines with air-water mixtures as the working fluid can offer high electrical efficiencies and high specific power outputs to specific investment costs below that of combined cycles as discussed by the authors, but they are not suitable for large-scale applications.

TL;DR: In this article, the authors discuss the energy consumption and energy saving potential for a major energy-intensive product in the chemical industry-ammonia, based on technologies currently in use and possible process improvements.

TL;DR: Underground storage of industrial quantities of carbon dioxide in porous and permeable reservoir rocks has been taking place for the last 5 years at the Sleipner West gas field in the North Sea as mentioned in this paper.

TL;DR: In this paper, the authors show that the quality-corrected EROI is consistently much lower than the thermal equivalent E ROI, and it declines faster and to a greater extent than the thermalequivalent EORI.

TL;DR: In this paper, a structural design for developing a medium scale composite wind turbine blade made of E-glass/epoxy for a 750kW class horizontal axis wind turbine system was proposed.

TL;DR: In this article, the influence of selected economic and demographic variables on the annual electricity consumption in New Zealand has been investigated using multiple linear regression analysis, and it was found that the electricity consumption correlated effectively with all variables.

TL;DR: In this article, the authors describe a procedure for deriving a dynamic model of an HVAC system that consists of a zone, heating coil, cooling and dehumidifying coil, humidifier, ductwork, fan, and mixing box.

TL;DR: In this paper, the authors applied this super-hydrophilic nature to enhancement of boiling and evaporation heat transfer, and found that the critical heat flux (CHF) of TiO2-coated surface is about two times larger than that of noncoated one, and Leidenfrost temperature increases as the contact angle decreases.

TL;DR: In this article, energy consumption and carbon dioxide emissions from 17 countries of the Middle East and North Africa were studied using Data Envelopment Analysis using four indicators for the year 1996, and the patterns of changes in efficiency of the countries are further analyzed using Malmquist Productivity Index (MPI) approach for the period of 1992-1996.

TL;DR: In this paper, the authors discuss the similarities and the incompatibilities between two forms of energy analysis (exergy and emergy, "EXA" and "EMA" in the following), both of which try to represent the behavior of physical systems by means of cumulative energy input/output methods that result in a double integration over space and time domains.

TL;DR: In this article, the ANP model was applied to evaluate the alternative energy sources for the country and the results showed that the model can produce reasonable and applicable solutions for the case.

TL;DR: In this article, the authors analyzed the energy and environmental profile of photovoltaic systems, taking into account also the hidden impacts related to production, transportation and system disposal at the end of its technical life.

TL;DR: In this paper, the authors investigated the economic potential of hybrid power systems in Egypt's desert agriculture sector using optimization software and showed that hybrid systems are less costly than diesel generation from a net present cost perspective even with high diesel fuel price subsidies.

TL;DR: In this article, the use of stochastic search processes that are the basis of genetic algorithms (GAs) in developing Turkey's electric energy estimation has been described, and the industrial sector electricity consumptions and the totals are estimated, based on the basic indicators of the gross national product, population, import and export figures.

TL;DR: In this paper, a natural gas (NG) fired power plants with CO 2 capture was investigated using exergy analysis, and the effects of the changed NG composition and environmental temperature were investigated.

TL;DR: In this article, the authors investigate and demonstrate production methods at a continuous, bench-scale level and generate sufficient material for an initial evaluation of a potentially profitable method of producing bioenergy and sequestering carbon.

TL;DR: In this paper, a set of stringent physical and statistical measures are proposed to create a semi-automated procedure that is based on the creation of an envelope in the clearness index-diffuse to global irradiance ratio domain.

TL;DR: In this paper, the displacement of a highly viscous wetting fluid by a nonwetting fluid with low viscosity in a random two-dimensional porous medium under stabilizing gravity was studied experimentally and numerically.

TL;DR: In this article, the authors show that the use of coarse temporal precision leads to averaging effects that result in misleading environmental and economic outcomes for cost-optimal micro-CHP systems, and that much finer temporal precision is required to capture the specific characteristics of residential energy demand and the technical qualities of solid oxide fuel cell and stirling engine micro CHP systems.

TL;DR: The authors used the US MARKAL model to simulate the impacts of hydrogen technologies on the US energy system and to identify potential impediments to a successful transition from a conventional petroleum-based energy system to a hydrogen economy.

TL;DR: In this paper, the extraction, conversion, and use of energy carriers and materials in the Norwegian society in 2000 were investigated by Sciubba's method of extended-exergy accounting (EEA) in this method, extended exergy (EE) values are assigned to labor and capital fluxes in addition to thermomechanical and chemical exergy values.

TL;DR: In this paper, a comparative study is performed for the transcritical carbon dioxide refrigeration cycles with a throttling valve and with an expander, based on the first and second laws of thermodynamics.

TL;DR: In this paper, the authors theoretically and experimentally investigated a device for inserting an absorbing plate into the double-pass channel in a flat-plate solar air heater with recycle, which substantially improves the collector efficiency by increasing the fluid velocity.

TL;DR: In this article, a survey has been carried out to show energy consumption, energy cost and the relationship between the energy usage and textile production in Turkey, and the results of the energy survey have been presented in both figure and table form.

TL;DR: In this article, the authors highlight the potential of coal-fired, synthesis-gas-based gasification systems that allow co-producing hydrogen, electricity and liquid fuels, and could be a key building block in a clean-coal technology strategy.

TL;DR: In this paper, the authors focus on the effective utilization of byproduct oxygen from electrolysis hydrogen production and discuss the potential demand for it, as well as evaluate its contribution to improving process efficiency.