A Comparative Analysis of Ground Source and Air Source Heat Pumps for Heating of an Office Building in Bergen

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The language parallel Pascal and other aspects of the massively parallel processor

A high level language for the Massively Parallel Processor (MPP) was designed. This language, called Parallel Pascal, is described in detail. A description of the language design, a description of the intermediate language, Parallel P-Code, and details for the MPP implementation are included. Formal descriptions of Parallel Pascal and Parallel P-Code are given. A compiler was developed which converts programs in Parallel Pascal into the intermediate Parallel P-Code language. The code generator to complete the compiler for the MPP is being developed independently. A Parallel Pascal to Pascal translator was also developed. The architecture design for a VLSI version of the MPP was completed with a description of fault tolerant interconnection networks. The memory arrangement aspects of the MPP are discussed and a survey of other high level languages is given

Expansion of the Severe Accident Code MELCOR by Coupling External Models (KIT Scientific Reports ; 7726)

In this work the MELCOR-Code is coupled with the Phase-Change Effective Convectivity Model (PECM) using the developed universal coupling tool DINAMO to improve the prediction of molten core material in the lower head during a severe accident in a Nuclear Power Plan. The coupled system was tested by simulating different experiments performed in the LIVE-facility. The coupled simulation of an entire severe accident shows the necessity for more detailed models in integral codes

Semi-analytical buckling code development of stitiffened and unstiffened plates with a free edge

Criteria for estimating the ultimate strength, using a semi-analytical approach, of unstiffened and stiffened plates with a free edge are addressed. The semi-analytical approach is based on a Rayleigh-Ritz discretisation of the deflections, and the equilibrium equations are solved using an incremental perturbation technique with arc length control. Large deflection theory is used to include non-linear geometrical effects associated with slender cases. Development of ultimate strength criteria, accounting for plasticity, is an important part of the present work. The model is implemented in FORTRAN, and the ultimate strength estimates are compared to the strength found with ABAQUS. Testing of stiffened plates are performed for eccentric flat bar stiffeners parallel to the free edge. It is possible to include other types of stiffeners and stiffener orientations in the model. The first linear elastic buckling mode is used as imperfection when testing the criteria. Combined imperfections are also studied for the stiffened cases. Strength estimates produced with the final model are satisfactory when compared to ABAQUS results. These tests are performed for a wide range of plate cases. All important buckling modes for stiffened plates are then considered, except from local buckling of the stiffeners themselves. The latter is normally not a restriction, since design codes requires rather stocky stiffener sections. Some model assumptions and principles with respect to boundary conditions, permanent plastic deformations and assumed imperfections were also investigated. These effects were studied using finite element analyses, for both unstiffened and stiffened plates. The tests were carried out for a small number of plate combinations, but the results presented indicated that the assumptions made in the semi-analytical model were reasonable

A study of automatic contingency selection algorithms for steady-state security assessment of power systems and the application of parallel processing

The performance of various Contingency Selection methods has been investigated within the framework of accuracy for application to steady-state power system security assessment and suitability for execution in a real-time environment. In the study the following requirements have been considered: (a) Effectiveness: in identifying contingencies which may cause limit violations and discarding all others; (b) Adaptability: to model both permanent and temporary changes in the system; (c) Flexibility: to model any number and type of contingencies; (d) Computational efficiency: in terms of speed in selecting the sub-set of contingencies as well as in terms of storage requirements; (e) Ability: to update and augment on-line the list of contingencies given the actual system operating data. [Continues.

2015 Oklahoma Research Day Full Program

This document contains all abstracts from the 2015 Oklahoma Research Day held at Northeastern State University

Modelling and control of united power flow controller for reinforcement of transmission systems

This thesis was submitted for the degree of Doctor of Philosophy and awarded by Brunel University.The work involved in the thesis is concentrated on modelling and control of UPFC. The overall objective is to provide effective methods and tools for assessing the impact of UPFC in the reinforcement of transmission systems. The thesis clarifies modelling and control of UPFC into several subproblems, in which the associated models, algorithms and control strategies of UPFC have been systematically reviewed. An electromagnetic transient prototype model of the UPFC has been set up by using its detailed power electronic device as well as its internal closed-loop controller. The problems encountered in the process of building such a model and the way of handling them by EMTP have been discussed. This EMTP-based simulator of SPWM UPFC implemented has provided a useful tool to assist the development and validation of more detailed and practical model of the UPFC for further studies. The steady-state modelling and control for the UPFC has been developed, including: (i) The power injection model of the UPFC suitable for its implementation in an optimal multiplier power flow computation method has been derived in rectangular form. The effectiveness of the proposed algorithm has been compared with the user defined model method. (ii) A systematic method for deriving the control capabilities of the UPFC has been proposed based on predicting the feasibility limit of the system. Using an index derived from optimal multiplier, three dimensional diagrams describing the ranges have been obtained. The results are also verified through the singular value decomposition algorithm. (iii) A power injection model based control method (PIM) has been proposed and implemented to directly derive the UPFC parameters as so to achieve the control objectives. The assumptions, algorithmic process and validation of the PIM have been investigated in detail. Its pros and cons are also discussed. (iv) Five internal limits of the UPFC device have been derived as the constraints to its performance. A complete set of control rules considering these limits as well as their implementation in the PlM have been constructed to form the basis of optimal UPFC control strategies for its steady-state local control. All the above proposed methods are tested and validated on the IEEE 30-bus system, a practical 306-bus system and a meshed network. The thesis concludes by suggesting the future research areas in further UPFC studies

Development of TOSCA service templates for provisioning portable IT services

Provisioning cloud computing solutions is a tedious and long process, especially when configuring many components and not only offering the application but also the infrastructure. Today, an administrator has to upload, install and configure all the components of a software solution manually, which not only takes time and is prone to errors but also increases the onboarding costs at the cloud provider. Decreasing deployment times by the use of an automated system is favored. TOSCA provides a specification which allows the deployment and management of cloud services by providing a meta-model. With that it is possible to mitigate all problems in theory. OpenTOSCA is a framework called container, which can interpret the TOSCA specification and is used in this work to deploy an Enterprise Content Management stack on a cloud environment, testing the boundaries of its capabilities. After designing deployment models by the means of a domain specific modeling approach, an implementation is realized and compiled into a deployment file. This file is also called a container file and is processed by OpenTOSCA to initiate the deployment on the cloud environment, including the necessary middleware. The goal of this diploma thesis is to develop a TOSCA Service Template, that provides a topology model and automates the deployment of ECM core components. TOSCA Node Types for the middleware and application components have to be defined. To further help modeling the topology, a domain specific model (DSM) will be introduced by generically defining all components and their operations. That generic model will be used to realize the actual ECM stack components. The ECM stack is then deployed via OpenTOSCA and the execution is reviewed