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Now showing items 1-10 of 33
A comparative study into the application of the NRS 048, IEEE 519-1992 and IEC 61000-3-2 on harmonic apportioning in a discrimitive tariff
(North-West University, 2003)
Development in power electronics enabled sophisticated energy conversion. These new solid-state energy conversion processes are energy-effective, but are inherently non-linear which means that the load current is typically ...
Optimising the operation of underground mine refrigeration plants and ventilation fans for minimum electricity cost
(North-West University, 2003)
This study describes the development and use of a mathematical model that will enable mine operators to
minimise the costs of electricity consumed by the ventilation and refrigeration systems used for
environmental control ...
The use of neural networks to determine the long-term impact of demand side management
(North-West University, 2003)
Eskom, South Africa national electricity provider, estimates that in the year 2006
South Africa will experience a capacity shortage. One way to address this problem is through the implementation of Demand-Side Management ...
The application of signal processing and artificial intelligence techniques in the condition monitoring of rotating machinery
(North-West University, 2003)
Condition monitoring of critical machinery has many economic benefits. The primary objective is to detect faults, for example on rolling element bearings, at an early stage to take corrective action prior to the catastrophic ...
Reverse engineering of a centrifugal turbine housing
(North-West University, 2003)
The Garrett GT 42 turbine housing is a spheroidal ductile cast iron casting, which according to the ASME B31.3 (1996) Code for Pressure Piping, does not satisfy the Pebble Bed Micro Model (PBMM) design requirements. By ...
Application of Monte Carlo analysis in the simulation of thermal-fluid network
(North-West University, 2003)
Large thermal-fluid network simulations are usually conducted for fixed input steady-state conditions without accounting for statistical variations of these variables. This is not realistic and gives no indication of ...
Analysis of the porosity variations in a pebble-bed reactor core
(North-West University, 2003)
The variation in porosity of a packed column is an important parameter in its design.
The flow patterns, mass transfer, heat transfer, and other transfer phenomena are
dependent on the porosity variations in the ...
Separation by pervaporation of methanol from tertiary amyl methyl ether using a polymeric membrane
(Potchefstroom University for Christian Higher Education, 2003)
In this study, the sorption and pervaporation characteristics of the commercial PERVAP2256® membrane with methanol and tert-amyt methyl ether (TAME) mixtures were investigated. The feed concentration and the feed temperature ...
Mathematical modeling of leakage flow through labyrinth seals
(North-West University, 2003)
Optimization of gas turbine systems has identified the need for simplified mathematical models to calculate the losses experienced within turbo machines. One such loss is that of the flow through labyrinth seals. As part ...
Thermal-fluid simulation investigation of the reactor cavity cooling system standpipes design for the pebble bed modular reactor
(North-West University, 2003)
Pebble Bed Modular Reactors are advanced nuclear reactors and are being developed
to possess inherent safety and reliability. This is achieved by utilizing a sequence of
passive thermal storage and heat transfer mechanisms, ...