Allocation of Manpower

In this study, the heat recovery from exhaust gas at the ACE Power Embilipitiya (Pvt) Ltd (APE) in Sri Lanka was conceptually proposed and evaluated. APE has an installed capacity of 100 MW comprising 14 units of 7.5MW medium speed diesel engines fired with heavy fuel oil. There is only a minimum recovery of waste heat in the plant at the moment, only for fuel preheating, whereas waste heat recovery (WHR) boilers of 750kWth are equipped on eight engines. The larger portion of the waste heat is dumped into the environment without being used in any reasonable way. The objective of this work was to design a HRSG system for the remaining six engines to recover maximum possible heat from the exhaust gas and select a suitable steam turbine according to the heat demand capacity of the proposed HRSG, for generating additional power and thus converting the APE plant into a sort of a combined cycle. At the initial stage of the investigation, the amount of recoverable waste heat was estimated by evaluating the known parameters of the engines at fully loaded condition. The maximum theoretical waste heat recovery potential from the exhaust gas stream of one engine was calculated as 9807.87 MJ/h, equivalent to a heat rate of 2724.4 kW. The modelling and optimization of the proposed HRSG was done using the Engineering Equation Solver (EES) software, considering technical and practical limitations such as pinch point temperature difference, approach point temperature difference, terminal temperature difference and sulphur dew point in the stack. A commercially available steam turbine with a power output of 3.579 MW was selected as the optimum steam turbine for the desired conditions, utilising 12884.4 MJ/h of recovered waste energy amounting to 21.89% of the total available energy in the flue gas

The teaching of aerospace vehicle design at Cranfield University with particular reference to the group design project

Over the years, the aircraft design course at Cranfield has evolved into the postgraduatemaster's programme in aerospace vehicle design that we have today. One of the unique featuresof the course is the extensive group design project, which has played a fundamental part inaircraft design education right from 1948 up to the current day. The success of the course, andthe student experience, depends on the success of the group design project. The philosophy ofthe role of the group design project in the teaching of aircraft design is discussed in detail in thispaper. Examples are presented of recent subject aircraft along with some novel features ofthese designs

Unintended Consequences of Price Controls: An Application to Allowance Markets

Price controls established in an emissions allowance market to constrain allowance prices between a ceiling and a floor offer a mechanism to reduce cost uncertainty in a cap-and-trade program; however, they could provide opportunities for strategic actions by firms that would result in lower government revenue and greater emissions than in the absence of controls. In particular, when the ceiling price is supported by introducing new allowances into the market, firms could choose to buy allowances at the ceiling price, regardless of the prevailing market price, in order to lower the equilibrium price of all allowances. Those purchases could either be transacted by a group of firms intending to manipulate the market or be induced through the introduction of inaccurate information about the cost of emissions abatement that causes firms to purchase allowances at the ceiling. Theory and simulations using estimates of the elasticity of allowance demand for U.S. firms suggest that the manipulation could be profitable under the stylized setting and assumptions evaluated in the paper, although in practice many other conditions will determine its use.cap-and-trade; climate change; price controls; price ceiling; manipulation; allowance market; carbon market

Global impacts of land degradation

Study commissioned by the Scientific, Technical and Advisory Panel (STAP) of the Global Environment Facility (GEF) to support the development of the new GEF focal area of Land Degradatio

Bringing Growth Theory "Down to Earth"

Explicitly accounting for certain basic physical laws governing the “earth” sector dramatically enriches our ability to explain a high degree of diversity in observed patterns of economic growth. We provide a theoretical explanation of why some countries have been able to sustain a more or less constant and positive rate of economic growth for many decades while so many others have failed to do so. The analysis predicts that countries that have an over abundance of physical capital (a concept that is precisely defined in the text) may be unable to sustain a positive rate of economic growth over the long run. Too much physical capital may affect the dynamics of the economy ultimately leading to stagnation. The plausibility of the growth model introduced here is demonstrated by its ability to predict some important stylized facts for which standard endogenous growth models generally cannot account.endogenous growth theory, unbalanced growth, structural change, stagnation, Environmental Economics and Policy, International Development, Labor and Human Capital, Political Economy, E22, Q01, O41,

Design study for a magnetically supported reaction wheel

Results are described of a study program in which the characteristics of a magnetically supported reaction wheel are defined. Tradeoff analyses are presented for the principal components, which are then combined in several reaction wheel design concepts. A preliminary layout of the preferred configuration is presented along with calculated design and performance parameters. Recommendations are made for a prototype development program

Magnetically suspended reaction wheel assembly

The magnetically suspended reaction wheel assembly (MSRWA) is the product of a development effort funded by the Air Force Materials Laboratory (AFML) at Wright Patterson AFB. The specific objective of the project was to establish the manufacturing processes for samarium cobalt magnets and demonstrate their use in a space application. The development was successful on both counts. The application portion of the program, which involves the magnetically suspended reaction wheel assembly, is emphasized. The requirements for the reaction wheel were based on the bias wheel requirements of the DSP satellite. The tasks included the design, fabrication, and test of the unit to the DSP program qualification requirements

The New Golden Era: Annotated Bibliography

An annotated bibliography on Broadway musicals

Environmental Education Through The Use Of Erosional Features

Article from Geographical Proceedings of 1979/80.This article is based upon teaching materials prepared for the FAO Southern Africa Training Programme (Overseas Development Group, Norwich) and in preparation for another FAC project in land use and regional planning, Central Province, Zambia