Risk and reliability assessment of the district heating network methodology with case study

2016 ◽  
pp. 2578-2585
Author(s):  
I Žutautait˙e ◽  
J Augutis ◽  
R Krikštolaitis ◽  
G Dundulis ◽  
M Valinčius ◽  
...  
Keyword(s):  
Reliability Assessment ◽  
District Heating

scholarly journals A Planning Tool for Reliability Assessment of Overhead Distribution Lines in Hybrid AC/DC Grids

2021 ◽  
Vol 13 (11) ◽  
pp. 6099
Author(s):  
Giovanna Adinolfi ◽  
Roberto Ciavarella ◽  
Giorgio Graditi ◽  
Antonio Ricca ◽  
Maria Valenti
Keyword(s):  
Reliability Assessment ◽  
Reliability Function ◽  
Climatic Conditions ◽  
Planning Tool ◽  
Grid Resource ◽  
Distribution Lines ◽  
Ac Networks ◽  
Reliability Performance ◽  
Power Dispatching

Integration of DC grids into AC networks will realize hybrid AC/DC grids, a new energetic paradigm which will become widespread in the future due to the increasing availability of DC-based generators, loads and storage systems. Furthermore, the huge connection of intermittent renewable sources to distribution grids could cause security and congestion issues affecting line behaviour and reliability performance. This paper aims to propose a planning tool for congestion forecasting and reliability assessment of overhead distribution lines. The tool inputs consist of a single line diagram of a real or synthetic grid and a set of 24-h forecasting time series concerning climatic conditions and grid resource operative profiles. The developed approach aims to avoid congestions criticalities, taking advantage of optimal active power dispatching among “congestion-nearby resources”. A case study is analysed to validate the implemented control strategy considering a modified IEEE 14-Bus System with introduction of renewables. The tool also implements reliability prediction formulas to calculate an overhead line reliability function in congested and congestions-avoided conditions. A quantitative evaluation underlines the reliability performance achievable after the congestion strategy action.

District heating and electricity production based on biogas produced from municipal WWTPs in Turkey: A comprehensive case study

Energy ◽  
2021 ◽  
Vol 223 ◽  
pp. 119904
Author(s):  
Aysegul Abusoglu ◽  
Alperen Tozlu ◽  
Amjad Anvari-Moghaddam
Keyword(s):  
District Heating ◽  
Electricity Production

Method for Redesign of District Heating Networks within Transition from the 2nd to the 3rd Generation

2014 ◽  
Vol 657 ◽  
pp. 689-693
Author(s):  
Răzvan Corneliu Lefter ◽  
Daniela Popescu ◽  
Alexandrina Untăroiu
Keyword(s):  
District Heating ◽  
Design Stage ◽  
Heating Systems ◽  
Load Duration ◽  
Load Duration Curve ◽  
District Heating Systems ◽  
Consumption Rates ◽  
Heat Loads ◽  
Heating Networks

Important investmentsare made lately in the area of district heating, as a technology capable ofhelping countries to reach sustainability goals. In Romania, European fundswere spent for transition from the 2nd to the 3rdgeneration of district heating systems. The lack of appropriate monitoringsystems in old district heating systems makes optimisation nowadays very difficult,especially because nominal values used in the first design stage areoverestimated. Realistic nominal heat loads are necessary to make goodestimations of hydraulic parameters to be used for redesign. This studyproposes a method that uses the heat load duration curve theory to identify theappropriate nominal heat loads to be used for redesign. Comparison betweenresults obtained by applying the nominal heat loads of each consumer, as theywere established in the first design stage, and the ones identified by theproposed method are analyzed in a case study. The results show that errors arein the +/- 3% band, between the metered heat consumption rates and the proposedrates. The new method can be used for the sizing of pumps and district heatingnetworks after retrofit, in order to get better adjustments of the circulationpumps and increase of the energy efficiency.

RT Level vs. Microarchitecture-Level Reliability Assessment: Case Study on ARM(R) Cortex(R)-A9 CPU

2017 ◽  
Author(s):  
Athanasios Chatzidimitriou ◽  
Manolis Kaliorakis ◽  
Dimitris Gizopoulos ◽  
Maurizio Iacaruso ◽  
Mauro Pipponzi ◽  
...  
Keyword(s):  
Reliability Assessment

scholarly journals Consumer Ownership of Natural Monopolies and its Relevance for the Green Transition: The Case of District Heating

2021 ◽  
Vol 1 (1) ◽  
Author(s):  
Søren Djørup ◽  
Ole Odgaard ◽  
Karl Sperling ◽  
Henrik Lund
Keyword(s):  
Policy Development ◽  
District Heating ◽  
Vital Role ◽  
Price Regulation ◽  
Information Costs ◽  
Monopoly Regulation ◽  
Consumer Prices ◽  
Institutional Structures ◽  
Sustainable Energy Systems

District heating is important for the transition to sustainable energy systems. In order to implement district heating, consumers’ trust and acceptance of this technical monopoly structure is necessary. This necessity leads to the question of price regulation and ownership in the district heating sector, since these institutional structures are the measures for creating trust and acceptance. This article is based on a Coasian approach, where information costs and concrete institutional structures are at the centre of the analysis. This approach is applied for the purpose of understanding the role of consumer ownership in the district heating sector. An ownership model which has been shown to be the most efficient in Denmark. Through a detailed empirical case study, it is shown how private commercial companies have avoided the state regulatory monopoly price regulation and inflated consumer prices. The case study also describes how changes in ownership immediately led to price reductions. It is concluded that the consumer ownership model has played a vital role in getting price regulation to succeed and thereby consumers to trust and accept the district heating systems in Denmark. This result is an important contribution to heating policy development as well as monopoly regulation theory.

scholarly journals Structural reliability assessment based on optical monitoring system: case study

2016 ◽  
Vol 9 (2) ◽  
pp. 297-305 ◽  
Author(s):  
E. Mesquita ◽  
P. Antunes ◽  
A. A. Henriques ◽  
A. Arêde ◽  
P. S. André ◽  
...  
Keyword(s):  
Structural Health Monitoring ◽  
Health Monitoring ◽  
Structural Reliability ◽  
Extreme Values ◽  
Low Cost ◽  
Reliability Assessment ◽  
Water Reservoir ◽  
Optical Systems ◽  
Structural Health

ABSTRACT Optical systems are recognized to be an important tool for structural health monitoring, especially for real time safety assessment, due to simplified system configuration and low cost when compared to regular systems, namely electrical systems. This work aims to present a case study on structural health monitoring focused on reliability assessment and applying data collected by a simplified optical sensing system. This way, an elevated reinforced concrete water reservoir was instrumented with a bi-axial optical accelerometer and monitored since January 2014. Taking into account acceleration data, the natural frequencies and relative displacements were estimated. The reliability analysis was performed based on generalized extreme values distribution (GEV) and the results were employed to build a forecast of the reliability of the water elevated reservoir for the next 100 years. The results showed that the optical system combined with GEV analysis, implemented in this experimental work, can provide adequate data for structural reliability assessment.

RELIABILITY ASSESSMENT OF SAFETY INSTRUMENTED SYSTEMS IN THE OIL AND GAS INDUSTRY: A PRACTICAL APPROACH AND A CASE STUDY

2009 ◽  
Vol 16 (02) ◽  
pp. 187-212 ◽  
Author(s):  
MARY ANN LUNDTEIGEN ◽  
MARVIN RAUSAND
Keyword(s):  
Oil And Gas ◽  
Fault Tree ◽  
Reliability Assessment ◽  
Fault Tree Analysis ◽  
Practical Approach ◽  
Suggested Approach ◽  
Tree Analysis ◽  
Common Cause ◽  
Common Cause Failures

This article presents a practical approach to reliability assessment of a complex safety instrumented system that is susceptible to common cause failures. The approach is based on fault tree analysis where the common cause failures are included by post-processing the minimal cut sets. The approach is illustrated by a case study of a safety instrumented function of a workover control system that is used during maintenance interventions into subsea oil and gas wells. The case study shows that the approach is well suited for identifying potential failures in complex systems and for including design engineers in the verification of the reliability analyses. Unlike many software tools for fault tree analysis, the approach gives conservative estimates for reliability. The suggested approach represents a useful extension to current reliability analysis methods.

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