Thermal efficiency

Xem 1-20 trên 29 kết quả Thermal efficiency
  • Thermal power plants are one of the most important process industries for engineering professionals. Over the past decades, the power sector is facing a number of critical issues; however, the most fundamental challenge is meeting the growing power demand in sustainable and efficient ways. Practicing power plant engineers not only look after operation and maintenance of the plant, but, also look after range of activities including research and development, starting from power generation to environmental aspects of power plants.

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  • The present science book "Application of Solar Energy" is edited by Professor R. D. Rugescu in the series on Solar Power and consists of 7 chapters that begin with the proof of the high thermal efficiency of the gravitational draught through concentrated solar heating. It continues with novel technologies of producing organic fuels through solar heating, new types of photovoltaic cells, long term use of thermal solar power plants, the efficiency of thermal storage and applications in Niger of the Solar power.

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  • This book has been written to present elementary practical and efficient applications in saving energy concept, as well as propose a solitary action for this category of topics. The book aims to illustrate various methods in treatment the concept of thermal insulation such as processes and the attempt to build an efficient passive building model.

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  • Chapter 6 - The second law of thermodynamics. In this chapter, the thermal energy reservoirs, reversible and irreversible processes, heat engines, refrigerators, and heat pumps are introduced first. Various statements of the second law are followed by a discussion of perpetualmotion machines and the thermodynamic temperature scale. The Carnot cycle is introduced next, and the Carnot principles are discussed. Finally, the idealized Carnot heat engines, refrigerators, and heat pumps are examined.

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  • Spirax Sarco recirculating feedwater spray systems type RFS are designed to provide additional flash steam condensing capacity on boiler feedtank applications. When the condensate return flowrate is high and the cold make-up flowrate is intermittent it is likely that valuable flash steam will be lost through the vent. To ensure that this flash steam is condensed it is often worthwhile to take feedwater from a relatively cool part of the feedtank and pump it to a spray nozzle.

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  • Electrical machines are almost entirely used in producing electricity, and there are very few electricity-producing processes where rotating machines are not used. In such processes, at least auxiliary motors are usually needed. In distributed energy systems, new machine types play a considerable role: for instance, the era of permanent magnet machines has now commenced. About half of all electricity produced globally is used in electric motors, and the share of accurately controlled motor drives applications is increasing.

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  • Thermal power plants are one of the most important process industries for engineering professionals. Over the past few decades, the power sector has been facing a number of critical issues. However, the most fundamental challenge is meeting the growing power demand in sustainable and efficient ways.

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  • As motive force of processes, heat must be transferred from one fluid to other, task that is performed by means of heat exchangers. From this point of view, heat exchangers represent an important element of thermal facilities that has substantially contributed to technical development of the society. Today it is impossible to imagine any branch of process engineering and energy technology without involvement of heat exchangers. Advanced models of these apparatus were proposed in the middle of the 18th century, while theoretical backgrounds have been completed a century later....

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  • This book discusses an emerging approach to architecture in which building performance is a guiding design principle. This architecture places broadly defined performance above, or on a par with, form-making; it utilizes digital technologies of quantitative and qualitative performance-based simulation to offer a comprehensive new approach to the design of the built environment.

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  • Efficient ethanol plants can convert 90-97 percent of the corn’s starch content to ethanol. However, not all batches of corn leave the same amount of starch residue. Studies of ethanol yields from different batches show significant variability (Dien et al., March 2002). Even though it is the starch that is turned into ethanol, researchers have been unable to find a correlation between starch content (or even starch extractability) and the final yield of ethanol (Singh and Graeber). Researchers believe some starches are in a more available form (Dien et al., March 2002).

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  • Following comprehensive updates and revision of the two other vol- umes in this series ‘Domestic Gas Installation Practice’ and ‘Indus- trial and Commercial Gas Installation Practice’ (formerly Gas Service Technology 2 and 3), it was clearly essential that this, the first volume in the series, be brought up to date. ‘Basic Science and Practice of Gas Service’ leads the reader through the knowledge and understand- ing required to put into practice the safe installation and servicing procedures described in Volumes 2 and 3.

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  • Chapter 10 - Vapor and combined power cycles. The objectives of Chapter 10 are to: Analyze vapor power cycles in which the working fluid is alternately vaporized and condensed, analyze power generation coupled with process heating called cogeneration, investigate ways to modify the basic Rankine vapor power cycle to increase the cycle thermal efficiency.

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  • that can occur during the various phases of oil and gas recovery from subsurface reservoirs including production, drilling, hydraulic fracturing, and workover operations. Formation damage assessment, control, and remediation are among the most important issues to be resolved for efficient exploitation of hydrocarbon reservoirs. Such damage is caused by various adverse processes, including chemical, physical, biological, and thermal interactions of formation and fluids, and deformation of formation under stress and fluid shear.

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  • CONTENTS CONTENTS Worm Gears C H A P T E R n 1101 31 1. 2. 3. 4. 5. 6. 7. 8. 9. Introduction Types of Worms Types of Worm Gears. Terms used in Wor m Gearing. Proportions for Worms . Proportions for Worm Gears. Efficiency of Worm Gearing. Strength of Worm Gear Teeth . Wear Tooth Load for Worm Gear. Thermal Rating of Worm Gearing. Forces Acting on Wor m Gears. Design of Worm Gearing. Worm Gears 10. 11. 12. Introduction 31.

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  • During the last two decades, increase in electricity demand and environmental concern resulted in fast growth of power production from renewable sources. Wind power is one of the most efficient alternatives. Due to rapid development of wind turbine technology and increasing size of wind farms, wind power plays a significant part in the power production in some countries.

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  • Timoshenko et al. Nanoscale Research Letters 2011, 6:349 http://www.nanoscalereslett.

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  • The paper presents the first results of study on isolation of curcumin from curcuma longa L. by ultrasonic extraction. The results show that by using ultrasonic technique the extraction efficiency in comparison with the solid-liquid extraction with stirring and thermal treatment will be increased and in the other hand the extraction time will be reduced nearly 90%. In addition, ultrasonic extraction results in reducing cost and decomposed curcumin significantly due to the thermal treatment.

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  • Zhao et al. Nanoscale Research Letters 2011, 6:368 http://www.nanoscalereslett.com/content/6/1/368 NANO EXPRESS Open Access A compact model for magnetic tunnel junction (MTJ) switched by thermally assisted Spin transfer torque (TAS + STT) Weisheng Zhao1,2*, Julien Duval1,2, Jacques-Olivier Klein1,2 and Claude Chappert1,2 Abstract Thermally assisted spin transfer torque [TAS + STT] is a new switching approach for magnetic tunnel junction [MTJ] nanopillars that represents the best trade-off between data reliability, power efficiency and density.

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  • high heats by mass removal. Their most common use is as an external heat shield to protect supersonic aerospace vehicles from an excessive buildup of heat caused by air friction at the surface. The ablative material must have a low thermal conductivity in order that the heat may remain concentrated in the thin surface layer. As the surface of the ablator melts or sublimes, it is wiped away by the frictional forces that simultaneously heat newly exposed surfaces. The heat is carried off with the material removed. The less material that is lost, the more efficient is the ablative material....

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  • With an annual human population growth rate of 2.4%, the present 77.4 million Ethiopia’s human population will increase to about 149.3 million by the year 2040 (FAO 2005). The rural to urban ratio will also continue to change and is expected to increase in favour of urban population in the coming 25 years. The current rural and urban distribution of 84.7% and 15.3% will gradually reach 80.1% and 19.9% by the year 2020 (CSA 2008). Vulnerable age groups (up to 14 years) will account for 34% of the population.

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