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Gasification is considered to be a favourable method for converting a solid fuel into a more versatile gaseous fuel. Performance of a gasifier depends on the design of the gasifier, type of fuel used and air flow rate, etc. The applications of spouted bed for a variety of processes such as drying, coating, pyrolysis, gasification and combustion have been reported. Gasification of solid fuels in a...
The purpose of this study is to analyze the performance characteristics of recuperated gas turbines operating at part load conditions. Differences in part load performance, due to various factors in design and operation, have been investigated. Various part load operation strategies including simple (fuel only control), variable speed and variable inlet guide vane operations for the single-shaft configuration...
An activated carbon–methanol adsorption refrigeration system is tested, in which the performances of a granular bed and a solidified bed are compared. Results are presented and the effects of heat and mass transfer are analyzed. It is proved that the coefficient of performance of refrigeration (COP) is increased by 60% if heat and mass recovery is used for a two-granular-bed system. It is also shown...
In a conventional internal combustion engine, approximately one-third of total fuel input energy is converted to useful work. Since the working gas in a practical engine cycle is not exhausted at ambient temperature, a major part of the energy is lost with the exhaust gases. In addition, another major part of energy input is rejected in the form of heat via the cooling system. If the energy normally...
A district heating (DH) system usually covers a local heat market only. Each system is characterised by a unique size, load profile and set of heat supply technologies. This diversity makes it difficult to analyse changes in the DH sector of a country as a whole. In national energy systems modelling and in life cycle assessment (LCA), the DH systems are typically, for practical reasons, aggregated...
Three wastes are examined: agricultural slurry, municipal solid waste (MSW) and sludge (wastewater bio-solids). The recommended utilisation of biogas generated from the digestion of agricultural slurry and of the organic fraction of municipal solid waste (OFMSW) is as a transport fuel. Due to parasitic demands only 50% of biogas is available for export. The lack of a market for thermal product in...
The purpose of this work is to prove the technical feasibility of the bubbling fluidized bed co-combustion, using biomass and low-grade coal mixtures and applying the exergy method. The pilot plant modelled is an atmospheric bubbling fluidized bed combustion chamber with a nominal capacity of 1MWth. We have applied the mass balance, the energy balance and the exergy balance to the plant in nine experiments,...
This paper deals with estimating aircraft landing and take-off (LTO) emissions (HC, CO, NO x , SO 2 ) at 40 Turkish airports including the biggest airports, i.e. Ataturk International Airport (AIA) in Istanbul, Antalya Airport in Antalya and Esenboga Airport in Ankara in 2001. The calculation model is based on flight data recorded by the State Airports Authority. The flight data include...
Electricity demand forecasting is becoming an essential tool for energy management, maintenance scheduling and investment decisions in the future liberalized energy markets and fluctuating fuel prices. To address these needs, appropriate forecasting tools for the electricity demand in Greece have been developed and tested. Electricity demand depends on economic variables and national circumstances...
Weather delay is a common risk in offshore energy production, and in the Gulf of Mexico, the occurrence of tropical storms and hurricanes regularly force operators to shut-down production, cease drilling and construction activities, and evacuate personnel. In physical terms, shutting-in a well will usually not cause a loss of the hydrocarbon resource, but in financial terms, the impact of deferred...
The ethylene production process is one of the most important aspect of a petrochemical plant and the cracking furnace is the heart of the process. Since, ethylene is one of the raw materials in the chemical industry and the market situation of not only the feed and the product, but also the utility is rapidly changing, the optimal operation and control of the plant is important. A mathematical model,...
Exergoeconomics is an attractive research field regarding the optimisation of design and operability where complex energy systems are concerned. The different approaches to thermoeconomics can easily achieve optimal or near-optimal solutions for the design of energy systems in industrial applications, characterised by regular energy demand profiles; for applications in buildings, however, the great...
This paper describes the optimization of the distribution of heat transfer (cooling) during the process of gas compression. The coolant is a stream of cold liquid. There is a fundamental tradeoff between the savings in compressor power, which are due to distributed cooling, and the pumping power required to circulate the coolant. The tradeoff is revealed on the basis of a combined model of multi-stage...
In this study, flat plate, finned and v-corrugated air heaters were investigated both experimentally and theoretically in an effort to improve the performance of conventional air heaters. Collectors were also tested in double pass mode to investigate the extent of improvement in efficiency that could be achieved without increasing the collector size or cost. A series of experiments were conducted,...
Due to high energy efficiency and zero emissions, some believe fuel cell vehicles (FCVs) could revolutionize the automobile industry by replacing internal combustion engine technology, and first boom in China. However, hydrogen infrastructure is one of the major barriers. Because different H 2 pathways have very different energy and emissions effects, the well-to-wheels (WTW) analyses are...
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