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Article
Publication date: 1 July 2014

Andreas Blaszczyk, Reto Flückiger, Thomas Müller and Carl-Olof Olsson

The purpose of this paper is to present a method for thermal computations of power devices based on a coupling between thermal and pressure networks. The concept of the…

Abstract

Purpose

The purpose of this paper is to present a method for thermal computations of power devices based on a coupling between thermal and pressure networks. The concept of the coupling as well as the solution procedure is explained. The included examples demonstrate that the new method can be efficiently used for design of transformers and other power devices.

Design/methodology/approach

The bidirectional propagation of temperature signal is introduced to the pressure network, which enables control of the power flow and a close coupling to the thermal network. The solution method is based on automatic splitting of the network definition (netlist) into two separate networks and iteratively solving the model using the Newton-Raphson approach as well as the adaptive relaxation enhanced by the direction change control.

Findings

The proposed approach offers reliable convergence behaviour even for models with unknown direction of the fluid flow (bidirectional flows). The accuracy is sufficient for engineering applications and comparable with the computational fluid dynamics method. The computation times in the range of milliseconds and seconds are attractive for using the method in engineering design tools.

Originality/value

The new method can be considered as a foundation for a consistent network modelling system of arbitrary thermodynamic problems including fluid flow. Such a modelling system can be used directly by device designers since the complexity of thermodynamic formulations is encapsulated in predefined network elements while the numerical solution is based on a standard network description and solvers (Spice).

Details

COMPEL: The International Journal for Computation and Mathematics in Electrical and Electronic Engineering, vol. 33 no. 4
Type: Research Article
ISSN: 0332-1649

Keywords

Article
Publication date: 7 April 2015

Sebastian Godenhjelm, Rolf A. Lundin and Stefan Sjöblom

The purpose of this paper is to establish an understanding of what projectification means, how projectification is driven forward, as well as what the consequences of…

1751

Abstract

Purpose

The purpose of this paper is to establish an understanding of what projectification means, how projectification is driven forward, as well as what the consequences of projectification are in an European Union (EU) context, and in the public sector in general.

Design/methodology/approach

The research methods consist of a literature review as well as a meta-analysis of key EU policy documents related to the functioning of regional development and projects. The paper shows that structural developments brought forth by a projectification in a public sector context have significant consequences.

Findings

Without contextually sensitive interlinking mechanisms between temporary and permanent structures projects risk losing their flexible and innovative qualities, and may fragment the ability of permanent organisations for maintaining coordination and continuity. The findings suggests that the proximity of permanent organisations, the discretion of entrepreneurship, the political priority of the task, the inclusion of competencies and interests, and the quality of transfer mechanisms are essential variables in explaining the outcome of temporary organisations in a politico-administrative context.

Research limitations/implications

The paper contributes to the literature on projects in a public sector context and suggests that comparative research on the drivers and consequences of public sector projectification in supranational as well as national contexts is needed.

Practical implications

The increasing requirements for applied project management skills and methods as criteria for project selection in the public sector highlight the importance of a broader theoretical and practical understanding of projectification.

Originality/value

The paper adds a new dimension to the projectification debate by presenting a descriptive and conceptual discussion about the consequences of public sector projectification in an EU context. It complements an existing theory of the temporary organisation and takes the first steps towards a theory applicable to projectification in a public context.

Details

International Journal of Managing Projects in Business, vol. 8 no. 2
Type: Research Article
ISSN: 1753-8378

Keywords

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