Second Generation Sodium Heat Pipe Receiver for a USAB V-160 Stirling Engine: Evaluation of On-Sun Test Results Using the Proposed IEA Guidelines and Analysis of Heat Pipe Damage

1997 ◽  
Vol 119 (4) ◽  
pp. 279-285 ◽  
Author(s):  
D. Laing ◽  
C. Tra¨bing
Keyword(s):  
Performance Evaluation ◽  
Heat Pipe ◽  
Second Generation ◽  
International Energy Agency ◽  
Test Results ◽  
Energy Agency ◽  
Term Operation ◽  
Sodium Heat Pipe ◽  
Absorber Surface

At the DLR a second generation sodium heat pipe receiver for the Schlaich Bergermann und Partner (SBP) 9-kWe dish/Stirling system has been developed and constructed. Long-term operation occurred from Oct. 1992 until Aug. 1993 at the Plataforma Solar de Almeria (PSA) in Spain, accumulating 950 operating hours. The performance of the SBP 9-kWe system with a sodium heat pipe receiver is evaluated according to the guidelines for dish/Stirling performance evaluation by Stine and Powel, as proposed to the International Energy Agency (IEA). Tests were stopped due to a leak in the receiver absorber surface. The analysis of this damage are reported.

Short and Long Term Extreme Reliability Analysis Applied to Floating Wind Turbine Design

2011 ◽  
Author(s):  
Timothe´e Perdrizet ◽  
Daniel Averbuch
Keyword(s):  
Wind Turbine ◽  
International Energy Agency ◽  
Energy Agency ◽  
Floating Wind Turbine ◽  
Extreme Response ◽  
Short And Long Term ◽  
Turbine Design ◽  
Wave Induced

This paper describes and exemplifies an efficient methodology to assess, jointly and in a single calculation, the short and long terms failure probabilities associated to the extreme response of a floating wind turbine, subjected to wind and wave induced loads. This method is applied to the realistic case study OC3-Hywind used in phase IV of the IEA (International Energy Agency) Annex XXIII Offshore Code Comparison Collaboration. The key point of the procedure, derived from the outcrossing approach, consists in computing the mean of the outcrossing rate of the floating wind turbine response in the failure domain over both the short term variables and the ergodic variables defining long term parameters.

scholarly journals La stabilité de l’OPEP

2005 ◽  
Vol 10 (3) ◽  
pp. 503-526
Author(s):  
The-Hiep Nguyen
Keyword(s):  
Supply And Demand ◽  
International Energy Agency ◽  
The United States ◽  
Energy Agency ◽  
Energy Field ◽  
World Energy ◽  
Petroleum Sector ◽  
The Stability ◽  
Near Future

In the energy field and more specifically in the petroleum sector, several models have been developed with a view to determining long-term price strategies and supply and demand flows without considering the sector in question from an oligopolistic perspective : institutions have been excluded from these models. This study explicitly recognizes the importance of variables often characterized as extra-economic and proposes to examine the degree of OPEC's stability. Among the factors that could negatively influence this stability are bilateral oil agreements, the coalition of consumer countries within the International Energy Agency and rivalry among the members of OPEC. The respective weight of each of these factors has been carefully examined. On the other hand, an oil price indexing formula accepted and respected by all parties concerned would ensure the stability of this organization. However, stability via indexing is unlikely as it is difficult to find a formula acceptable to all parties. It is therefore to be anticipated that the world energy and petroleum situation in the near future will be a function of the policies of the two poles : the United States, the largest consumer, and Saudi Arabia, the largest producer. The functions-objectives of these two countries have also been examined in order to derive a number of specific hypotheses relative to the eventual evolution of the energy and petroleum sector.

scholarly journals Method to Evaluate the Resistance–Capacitance Voltage Divider and Uncertainty Analysis

Energies ◽  
2021 ◽  
Vol 14 (22) ◽  
pp. 7744
Author(s):  
Yi Luo ◽  
Bin Guo ◽  
Bin Qian ◽  
Lijuan Xu ◽  
Fan Zhang ◽  
...  
Keyword(s):  
Uncertainty Analysis ◽  
Measurement Errors ◽  
Measurement Accuracy ◽  
Dielectric Breakdown ◽  
Voltage Divider ◽  
Test Results ◽  
Term Operation ◽  
Economic Significance ◽  
Capacitance Voltage

The resistance and capacitance parameters of a resistance–capacitance divider may change due to factors such as long-term operation, internal insulation flashover, and dielectric breakdown, which will affect the measurement characteristics of the resistance–capacitance divider. Since it is difficult to separate the voltage divider, and because improper disassembly will damage the insulation of the equipment, measuring the resistance and capacitance parameters of a voltage divider non-destructively has always been a problem. In this paper, an indirect method for evaluating the resistance and capacitance parameters is proposed, and the uncertainty of measurement of this method is determined. Simulation and actual test results show that this method can be used to estimate the resistance–capacitance parameters and has a good level of measurement accuracy. Besides, through the uncertainty analysis, it is concluded that the proposed method can overcome measurement errors within a certain range and has high practicability. Finally, a very practical application scenario of the proposed method is given, showing that the proposed method has good economic significance.

scholarly journals КОЭФФИЦИЕНТЫ ДЕГРАДАЦИИ ПРОЧНОСТИ СИЛОВЫХ ЭЛЕМЕНТОВ КУПОЛА ПАРАШЮТА ПОСЛЕ ДЛИТЕЛЬНОЙ ЭКСПЛУАТАЦИИ ИЛИ ХРАНЕНИЯ

2019 ◽  
pp. 62-71
Author(s):  
Петр Александрович Фомичев ◽  
Игорь Михайлович Сила
Keyword(s):  
Service Life ◽  
Breaking Load ◽  
Strength Characteristics ◽  
Test Results ◽  
Structural Elements ◽  
Term Operation ◽  
Lower Confidence ◽  
Strength Tests ◽  
Normal Law

The technique of processing the test results to the destruction of samples cut from slings and dome fabric after prolonged use or storage of the parachute is described. The normal law of load distribution before failure is adopted.It is proposed to find the minimum breaking load as the lower confidence limit depending on the number of tested samples and a confidence probability of 0.99.The results of strength tests of samples from the parachutes of the landing D-5 series 2 of 1983, the spare Z-5 of 1984, and the rescue S-5K series 2 of 1989 are presented.A total of 301 samples were tested, including 54 samples from slings D-5, 48 samples from slings Z-5 and S-5K, samples from fabrics of domes on the base and weft. Samples from slings were cut out at the edge of the dome, in the middle, at the arc buckles.Fabric samples were cut radially from the top to the edge of the dome. The dependence of the strength characteristics on the location of the samples along the length of the slings or the dome panel has not been established.There are no gross errors in the tests according to the Grubbs criterion.The strength degradation coefficients of the slings and fabrics of the domes are determined as the ratio of the breaking load after long-term operation or storage to the initial values adopted during the design.The proximity of the degradation coefficients of slings and dome fabrics was noted. Based on the set of test results in order to obtain the minimum values of the degradation coefficients, a linear dependence on the life of the parachute is established.This period should be counted from the year the parachute was made.The dependence of the minimum degradation coefficients (maximum degradation) on the service life makes it possible to assess the drop in the strength characteristics of the structural elements with increasing service life. This dependence allows you to predict the maximum allowable landing speed when deciding on the extension of the life of the parachute.

Scenarios for Evaluation of Technology Development Options for Power Generation Equipment

2005 ◽  
Author(s):  
Flavio J. Franco
Keyword(s):  
Power Generation ◽  
Technology Development ◽  
International Energy Agency ◽  
Energy Agency ◽  
Energy Technologies ◽  
New Energy ◽  
Power Generation Equipment ◽  
Final Energy Consumption ◽  
Commercial Organizations

Several national and international organizations publish long term studies of possible future evolutions of primary and final energy consumption, installed power generation, adoption of new energy technologies and greenhouse gas emissions, for example, in the form of ‘scenarios’. Which scenario or combination of scenarios will come true depends on many factors, not least the choice of technologies to be developed and the amount of resources put into the development of the chosen technologies. Power generation equipment manufacturers thus have a strong influence on how the future of the energy world will unfold, through their technological choices and the investments they make to develop the technologies. However their own future also depends on how external factors evolve, including, for example, public opinion, economics, population growth, competitor technologies etc., which are also considered in the aforementioned scenarios. In this paper a discussion is made of the aspects of scenarios described in the literature that are relevant for technology strategic management within the time scales usually considered by commercial organizations. As a result, two scenarios are proposed, based on those presented by the International Energy Agency and on data from other sources.

Neither oil nor coal demand is likely to peak by 2040

2019 ◽  
Keyword(s):  
Energy Demand ◽  
Oil And Gas ◽  
International Energy Agency ◽  
Primary Energy ◽  
Energy Agency ◽  
Content Type ◽  
Primary Energy Demand ◽  
Term Energy ◽  
First Time

Subject Long-term energy markets outlook. Significance The International Energy Agency (IEA) has upgraded its forecast for total primary energy demand (TPED) to 2040 for the first time since it began projecting this far out in 2014. Impacts The IEA’s belief that the world is on an environmentally unsustainable path will bolster decarbonisation efforts nationally and globally. The IEA does not see oil demand peaking by 2040; this and gas’s growing share of global demand will help sustain oil and gas investment. China and India switching from coal to gas will reduce coal’s share of energy demand even though India’s official targets are optimistic.

Research into the lubrication of a rotary lip seal using ferrofluid

2021 ◽  
pp. 135065012110537
Author(s):  
Marcin Szczęch
Keyword(s):  
Magnetic Fluid ◽  
Operating Pressure ◽  
Test Results ◽  
Friction Zone ◽  
Lip Seal ◽  
Term Operation ◽  
Lip Seals ◽  
The Magnetic Field ◽  
Lubrication Conditions

The paper presents the results of research into a hybrid seal which is a combination of standard rotary lip seals and a magnetic fluid seal. To maintain the magnetic fluid in the friction zone region, either a specially shaped pole piece was used or the shaft was modified accordingly. The research study concerns the allowable operating pressure and lubrication conditions in short-term and durability tests after which shaft wear was also assessed. Magnetic fluids with different rheological and magnetic properties were considered. The test results showed that the long-term operation of a hybrid seal is possible. The requirements, however, are the appropriate value of the magnetic field and dynamic viscosity of the magnetic fluid.

Sign in / Sign up

Export Citation Format

Share Document