scholarly journals Reliability Performance of Combustion Turbines in Combined Cycle Duty

1982 ◽  
Author(s):  
R. E. Strong ◽  
K. H. Eagle ◽  
M. E. Duer
Keyword(s):  
Field Data ◽  
Combined Cycle ◽  
Utility Industry ◽  
The Subject ◽  
Reliability Performance

There is a belief held by the electrical utility industry that the combustion turbine is unreliable and has a low availability value. This paper presents field data for combined cycle plants and concludes that the combustion turbine is, indeed, reliable. The importance of improved utility outage planning also is discussed in relation to increased availability values. Finally, areas for further attention are defined and will be the subject of future papers.

scholarly journals Cyclic Energy Demands Supplied Economically With Gas Turbines and Combined Cycle Plants

1971 ◽  
Author(s):  
H. L. Smith ◽  
R. J. Budenholzer
Keyword(s):  
Gas Turbines ◽  
Nuclear Power ◽  
Power Plants ◽  
Electric Utility ◽  
Combined Cycle ◽  
Electric Utility Industry ◽  
Utility Industry ◽  
New Class ◽  
Energy Demands ◽  
Distillate Fuel

The electric utility industry is finding a need for a new class of generation termed intermediate. This paper presents results of generation addition pattern studies performed to determine the relative merits of steam peaking plants and combined cycle plants in filling these needs. Corresponding optimum addition patterns are established for simple cycle gas turbine and nuclear power plants. The combined cycle and steam peaking plants are shown to be comparable at high cost levels, while the combined cycle shows definite advantage if permitted to burn non-distillate fuel.

scholarly journals A modified approach for estimation of Passenger Car Units on intercity divided multilane highways

2017 ◽  
Vol 42 (2) ◽  
pp. 65-74 ◽  
Author(s):  
Seelam Srikanth ◽  
Arpan Mehar
Keyword(s):  
Traffic Flow ◽  
Field Data ◽  
Area Ratio ◽  
Traffic Volume ◽  
Speed Ratio ◽  
Graphic Method ◽  
Microscopic Simulation ◽  
Time Headway ◽  
Vehicle Type ◽  
The Subject

The accuracy of measured traffic flow on a roadway is highly depends on correctness of PCUs used for converting traffic volume. Field data for the present study was collected from the mid-block road sections of different divided multilane highways in India. Video graphic method was used for collecting the field data. PCUs are estimated from the available methods as given in the literature by using traffic flow data observed in the field. Present study describes a modified methodology for estimation of PCU value of subject vehicles that includes the time headway as influencing parameter. The approach used in the present study is inspired from the method of dynamic PCU estimation where a PCU is expressed as the ratio of speed ratio and area ratio of standard cars to the subject vehicle type. Unlike dynamic PCU method, this method includes time headway factor for PCU estimation. The method found more realistic and logical as it provides relatively higher values of PCUs than those obtained from dynamic PCU method. Simulation of traffic flow was also performed through microscopic simulation model VISSIM for generating congestion and for comparing estimated PCU values at the level of maximum traffic volume. The methodology adopted in this study will be extended for development of comprehensive PCU model by including more numbers of influencing factors under varying traffic and roadway conditions.

scholarly journals STRATEGI KOMUNIKASI GURU DALAM PENDIDIKAN KARAKTER

DIALEKTIKA ◽  
2019 ◽  
Vol 6 (2) ◽  
pp. 164-171
Author(s):  
Veny Purba ◽  
Maya Retnasary ◽  
Annisa P Nurfadhillah
Keyword(s):  
Character Education ◽  
Teaching And Learning ◽  
Qualitative Method ◽  
Field Data ◽  
Rapid Development ◽  
Learning Activities ◽  
The Subject ◽  
Break Up ◽  
Descriptive Qualitative

Character education is important in the present given the rapid development of times can change the character of children to be backward. This research uses descriptive qualitative method by collecting field data and this research determines the subject of the research object by referring to interview guidelines for conducting interviews and observations. The result of this study indicate that character education in class 2 TKJ 2 always prioritizes approaches to be open to each other. So the teacher can easily understand the character of wild and deep children, and it is easy to be influenced towards a better direction. This research has implications for the school to pay attention to the character of their students and make changes more aggressively and shouldn’t break up communication with students and parents when outside teaching and learning activities, must continue to evaluate with parents, so student can help each other in educate the child’s character in a better direction.

On the Teaching of Performance Evaluation and Assessment of a Combined Cycle Cogeneration System

2008 ◽  
Author(s):  
A. O¨zer Arnas ◽  
Daisie D. Boettner ◽  
Seth A. Norberg ◽  
Gunnar Tamm ◽  
Jason R. Whipple
Keyword(s):  
Performance Evaluation ◽  
Second Law Of Thermodynamics ◽  
Combined Cycle ◽  
Second Law ◽  
First Law Of Thermodynamics ◽  
Systematic Fashion ◽  
Cogeneration System ◽  
The Subject ◽  
Alternative Designs ◽  
Evaluation And Assessment

Performance evaluation and assessment of combined cycle cogeneration systems are not taught well in academia. One reason is these parameters are scattered in the literature with each publication starting and ending at different stages. In many institutions professors do not discuss or even mention these topics, particularly from a second law perspective. When teaching combined cycle cogeneration systems to undergraduates, the professor should introduce pertinent parameters in a systematic fashion and discuss the usefulness and limitations of each parameter. Ultimately for a given situation, the student should be able to determine which parameters form the most appropriate basis for comparison when considering alternative designs. This paper provides two approaches, one based on energy (the First Law of Thermodynamics) and the other based on exergy (the Second Law of Thermodynamics). These approaches are discussed with emphasis on the “precise” teaching of the subject matter to undergraduates. The intent is to make coverage of the combined cycle cogeneration systems manageable so that professors can appropriately incorporate the topic into the curricula with relative ease.

A Simplified Hybrid Approach to Dynamic Model a Real HRSG

2015 ◽  
Author(s):  
Iacopo Rossi ◽  
Alessandro Sorce ◽  
Alberto Traverso ◽  
Fabio Pascucci
Keyword(s):  
Gas Turbine ◽  
Heat Recovery ◽  
Field Data ◽  
Historical Data ◽  
Hybrid Approach ◽  
Combined Cycle ◽  
Simplified Approach ◽  
Limited Experience ◽  
True System ◽  
High Range

This paper proposes a dynamic simplified approach to model a Heat Recovery Steam Generator of a Gas Turbine Combined Cycle (GTCC) and its validation against field data. The adopted framework begins with some physical considerations on global HRSG structure, and then focuses on a specific application for a real plant, i.e. a 390 MW multi-shaft combined cycle based on the AEN94.3 A4 frame. Moreover the model embodies some parameters, which are easily derived from historical data to enhance the forecasting capabilities of the software, resulting in a hybrid model which covers a high range of working conditions. The whole model is designed to run in Excel/Visual Basic environment to allow for extended use by people who have limited experience in advanced modelling software. The model so created has been handled through a training process based on 10 days of experimental data, in order to create the basis for true system flexibility. Therefore, the feasibility of this approach has been verified using a Gas Turbine (GT) load profile accomplished in everyday working operations and validating the results against field data.

scholarly journals On the Teaching of Performance Evaluation and Assessment of a Combined Cycle Cogeneration System

2009 ◽  
Vol 131 (2) ◽  
Author(s):  
A. Özer Arnas ◽  
Daisie D. Boettner ◽  
Seth A. Norberg ◽  
Gunnar Tamm ◽  
Jason R. Whipple
Keyword(s):  
Performance Evaluation ◽  
Second Law Of Thermodynamics ◽  
Combined Cycle ◽  
Second Law ◽  
First Law Of Thermodynamics ◽  
Systematic Fashion ◽  
Cogeneration System ◽  
The Subject ◽  
Alternative Designs ◽  
Evaluation And Assessment

Performance evaluation and assessment of combined cycle cogeneration systems are not taught well in academia. One reason is these parameters are scattered in the literature with each publication starting and ending at different stages. In many institutions professors do not discuss or even mention these topics, particularly from a second law perspective. When teaching combined cycle cogeneration systems to undergraduates, the professor should introduce pertinent parameters in a systematic fashion and discuss the usefulness and limitations of each parameter. Ultimately for a given situation, the student should be able to determine which parameters form the most appropriate basis for comparison when considering alternative designs. This paper provides two approaches, one based on energy (the first law of thermodynamics) and the other based on exergy (the second law of thermodynamics). These approaches are discussed with emphasis on the “precise” teaching of the subject matter to undergraduates. The intent is to make coverage of the combined cycle cogeneration systems manageable so that professors can appropriately incorporate the topic into the curricula with relative ease.

scholarly journals The Design and Operational Characteristics of a Combined Cycle Marine Powerplant

1972 ◽  
Author(s):  
C. A. Merz ◽  
T. J. Pakula
Keyword(s):  
Gas Turbine ◽  
Thermal Efficiency ◽  
Environmental Effect ◽  
Combined Cycle ◽  
Operational Flexibility ◽  
Operational Characteristics ◽  
Fuel Rate ◽  
The Subject ◽  
Rate Design ◽  
Generation Technology

The subject of this paper is the design and operational characteristics of a 43,000-shp combined gas turbine and steam turbine marine powerplant, known as COGAS. Based upon the “second generation technology” FT4C-2 marine gas turbine, the combined cycle fuel rate is 0.363 lb/shp-hr which represents a thermal efficiency of 41 percent. It is the intent of this paper to show that this low fuel rate design can be achieved with simplicity, operational flexibility, and minimum environmental effect.

A THEORY FOR THE REGIONAL CORRECTION OF POTENTIAL FIELD DATA

Geophysics ◽  
1954 ◽  
Vol 19 (1) ◽  
pp. 23-45 ◽  
Author(s):  
Fraser S. Grant
Keyword(s):  
Numerical Methods ◽  
Analytical Method ◽  
Potential Field ◽  
Field Data ◽  
Good Accuracy ◽  
Statistical Probability ◽  
Potential Field Data ◽  
Averaging Methods ◽  
The Subject ◽  
Local Potential Field

An analytical method based on the theory of statistical probability is developed for separating regional from local potential field effects. It is applied to an objective test on an artificial problem, as well as to a gravity survey that has already been the subject of studies of other averaging methods. It succeeds in both tests with good accuracy, and points up the danger of arbitrariness in the use of numerical methods.

A Model for the Study of Thai Buddhism

1976 ◽  
Vol 35 (3) ◽  
pp. 391-403 ◽  
Author(s):  
B. J. Terwiel
Keyword(s):  
Southeast Asia ◽  
Field Data ◽  
Relevant Literature ◽  
Religious Tradition ◽  
Folk Religion ◽  
Religious Change ◽  
Theravada Buddhism ◽  
The Subject ◽  
Major Factors ◽  
Central Thailand

THIS paper constitutes an attempt to reconcile—at least for one region of Southeast Asia: central Thailand—one of the discrepancies in analyses of contemporary Theravada Buddhism. The model proposed below—which is the outcome of comparing some of the relevant literature with my own field data—encompasses two distinct sections of society, each holding a different attitude towards Buddhism. The interaction between different interpretations of religion may well be one of the major factors n i the process of religious change in Thailand. Furthermore, this model may be of use for other Theravada Buddhist countries.Literature on the SubjectA survey of the literature on the practice of religion in Theravāda Buddhist countries reveals what may be a unique situation in the study of religions. Many authors state unequivocally that Theravāda Buddhists adhere to more than one religious tradition. Apart from “otherworldly” Buddhism, these Southeast Asian peoples adhere to other strands of religion, generally classed under rubrics such as “non-Buddhist beliefs,” “folk religion,” “animism,” or “supernaturalism.” Yet, though virtually all authors recognize this situation, there is no consensus in their views on how the different subsystems are interrelated.

Perspective on the Tidal Bore: Background and Initiation

2012 ◽  
Author(s):  
S. David Graber
Keyword(s):  
Literature Review ◽  
Field Data ◽  
Historical Context ◽  
Companion Paper ◽  
Extensive Literature ◽  
Scientific Interest ◽  
Tidal Bore ◽  
Extensive Literature Review ◽  
Tidal Bores ◽  
The Subject

Tidal bores have been the subject or cause of legend, poetry, recreation, tourism, shipping disasters, and scientific interest for centuries. They pose interesting theoretical questions for the engineer. Introductory details are presented regarding the remarkable tidal bore phenomenon, including discussion of the tidal bore in various locations and a recent photograph taken by the writer of the bore on China’s Qiantang River. A supplemental tabular summary is presented based on an extensive literature review. A simplified theory based on monoclinal rising waves is developed for the initiation of the tidal bore. The theory elucidates the mechanisms of the tidal bore more clearly and completely than more complex theories. Early studies of the tidal bore are cited and discussed in historical context. The intention is to provide greater understanding of the tidal bore for a broad set of readers. The theory is favorably compared to rectangular flume data and to all field data available to the writer. A companion paper builds on the present one by addressing additional features of the tidal bore.

Sign in / Sign up

Export Citation Format

Share Document