Exergetic, exergoeconomic and exergoenvironmental analysis of intercooled gas turbine engine

Exergetic and exergoeconomic and exergoenvironmental analyses have been performed for an advanced aero-derivative intercooled gas turbine engine. The proposed system was modelled using the IPSEpro software package and validated using manufacturer’s published data. The exergoeconomic model evaluates the cost-effectiveness of the gas turbine engine based on the Specific Exergy Costing [SPECO] method. The CO2 emissions per KWh were estimated using a generic combustor model, HEPHAESTUS, developed at Cranfield University. It is well known that the exergetic analysis can determine the magnitudes, locations and types of losses within an energy system. The effect of load and ambient temperature variations on gas turbine performance were investigated for two different configurations. The first system, Case-I, was a simple gas turbine (SCGT) engine, and the second, Case-II, an intercooling gas turbine (ICGT) system. The latter enhances gas turbine efficiency but, at the same time, has an adverse effect on the combustion chamber due to reduced compressed air temperature. It was confirmed that full load and low ambient temperature are preferable due to the low waste exergy. The unit exergy cost rate for both SCGT and ICGT have been calculated as 8.59 and 8.32 US$/GJ respectively. The exergoenvironmental results show the ICGT achieved lower emission levels and is more environmentally friendly than the SCGT

Energetic and exergetic analysis of combined cycle power plant: Part-1 operation and performance

Energetic and exergetic analyses are conducted using operating data for Sabiya, a combined cycle power plant (CCPP) with an advanced triple pressure reheat heat recovery steam generator (HRSG). Furthermore, a sensitivity analysis is carried out on the HRSG using a recent approach to differentiate between the sources of irreversibility. The proposed system was modelled using the IPSEpro software and further validated by the manufacturer’s data. The performance of the Sabiya CCPP was examined for different climatic conditions, pressure ratios, pinch point temperatures, high-pressure steam, and condenser pressure values. The results confirmed that 60.9% of the total exergy destruction occurs in the combustion chamber, which constitutes the main source of irreversibilities within a system. The exergy destruction was significantly affected by both the pressure ratio and the high-pressure steam, where the relation between them was seen to be inversely proportional. The high-pressure stage contributes about 50% of the exergy destruction within the HRSG compared to other stages and the reheat system, due to the high temperature difference between the streams and the large number of components, which leads to high energy loss to the surroundings. Numerous possibilities for improving the CCPP’s performance are introduced, based on the obtained results

Globalisation effects on networks in the GCC : exploring entrepreneurial networks in Kuwait

Although this paper’s focus is women business networks in the Gulf state of Kuwait, it locates the discussion in the broad field of globalisation studies, which can usefully be defined as the flow of trade, capital and people across frontiers, facilitated by different kinds of infrastructure, as well as forms of interconnectedness. As globalisation is increasing the dependency on economic actors and policy makers in a world of rapidly growing businesses that are reshaping the global arena, it is believed that scarcity of networks and lack of direct access to resources, information and support are barriers that many business encounter and women entrepreneurs face them more acutely. An important form of interconnectedness lies within the formation of networks of all types, where global, regional and local business networks have become hubs for entrepreneurs, particularly in Kuwait. Networks are rapidly growing in Kuwait, some are initiated in order to increase financial abilities of women and an example of that is Alghalia women network which was established in 2010 and membership is for women and by invitation only. Its mission is to create financial awareness amongst women in Kuwaiti society. Another is ‘Proud to be Kuwaiti’, a women and men entrepreneurial network, as well as Kuwait economic society female business network and other emergent networks. Yet, in spite of the growth in number of such networks, women entrepreneurs still face barriers. This research focuses on women entrepreneurs networking within local business networks. It uncovers various characteristics of networks, and through qualitative analysis, the reasons behind joining networks, barriers encountered and benefits gained. It does this through in-depth interaction with sixteen women entrepreneurs who are members of major networks. The research examines motivations behind women who join networks, the barriers women entrepreneurs face while networking, as well as benefits gained through different business stages

Psychiatric abuse and the concept of mental illness.

This thesis presents a critical analysis of the limitationand weakness of the concept of mental illness and proposes theReactive Functional Disorder (RFD) approach as an alternativemoral perspective on mental illness.Chapter one highlights, through an analysis of theproblems of psychiatric treatment in Kuwait, the vulnerabilityof the concept of mental illness to abuse. In Chapter two, it isargued that the current definitional systems used in psychiatryhave contributed to the vulnerability of the concept of mentalillness to abuse by employing definitions which are terminologically,clinically, and morally weak.In Chapter three, the RFD approach is presented in thehope that this account might provide a deeper understanding ofthe moral and conceptual implications of the concept of mentalillness.Chapter four provides an analysis of some of the writingsof Thomas Szasz, the controversial American psychiatrist, who arguesconsistently that mental illness is a myth and psychiatry is unlikeother well-established medical disciplines. It is argued thatDr. Szasz, in reality, is less against psychiatry than againstpsychiatric coercion and involuntary hospitalisation

Oral health knowledge and behavior among male health sciences college students in Kuwait

BACKGROUND: Health auxiliary personnel have an important role in oral health promotion when they graduate and start working in the health care system. This study aims to find out oral health knowledge and oral health behavior of male Health Sciences College students. METHODS: A questionnaire was distributed to all students at the male Health Sciences College in Kuwait (N = 153) during the academic year 2001/2002. The students filled the anonymous questionnaire in the class after the lecture. The response rate was 84% (n = 128). The questions consisted information on the general background, oral health behavior and oral health knowledge. RESULTS: Oral health knowledge seemed to be limited and very few background factors were associated with it. More than half of the students had visited a dentist during the previous 12 months, but only one third of students were brushing twice a day or more often. CONCLUSIONS: It may be concluded that the male Health Sciences College students seemed to have appropriate knowledge on some oral health topics, but limited knowledge on the others. Their toothbrushing practices are still far behind the international recommendation (twice a day) and also the knowledge, why it should be done so frequently also very limited

Discourses of Collective Spirituality and Turkish Islamic Ethics:An Inquiry into Transcendence, Connectedness, and Virtuousness in Anatolian Tigers

Based on case studies and qualitative interviews conducted with 40 stakeholders in five SMEs, or so called Anatolian tigers, in Turkey, this article has explored what collective spirituality and Turkish Islamic business ethics entail and how they shape organizational values using diverse stakeholder perspectives. The study has revealed six emergent discourses around collective spirituality and Islamic business ethics: Flying with both wings; striving to transcend egos; being devoted to each other; treating people as whole persons; upholding an ethics of compassion; and leaving a legacy for future generations. These discourses are organized around three themes of collective spirituality, respectively: Transcendence, connectedness, and virtuousness

Adoption of internal performance values for measurement of customer satisfaction

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