Now showing items 1-10 of 55
Efficiency analysis of an induction motor with direct torque and flux control at a hot rolling mill
(Energy Research Centre, University of Cape Town, 2015)
This paper presents an efficiency analysis of an induction motor with direct torque and flux control at a hot rolling mill in South Africa. Two scenarios were evaluated: 1) where the induction motor was controlled at ...
Energy management system for a residential grid-tied micro-grid
With the national power grid under tremendous pressure, there are enormous pressure exerted on residential electricity consumers to cut-back on electricity consumption to ensure a reliable supply. This has led to ...
Verifying the cooling capacity and power consumption of thermoelectric cooling holders for vaccine storage
The purpose of this paper is to verify the power consumption of different topologies of cooling system for the storage of vaccine in a portable solar powered vaccine carrier box for the domestic use in South Africa. The ...
Design of an intelligent controller for a renewable energy efficient bulk storage tank
The national electricity supplier in South Africa is experiencing difficulty in providing the required electricity, due to compliance with environmental regulations and the continuous price increase of commercial fuels. ...
In-line water heating system for industrial application
Due to the increase of electricity prices in South Africa and the World, there exists the need for energy efficient water heating systems. The authors of this paper conducted a literature study on existing water heating ...
Manufacturing of briquettes from typical highveld coal fines using various binders
(Swanson School of Engineering, Univ of Pittsburgh, 2015)
Constraining the dark matter density in galaxy clusters
We illustrate the potential of using stellar velocity dispersion profiles of brightest cluster galaxies (BCGs), in combination with X-ray and weak-lensing derived cluster mass profiles, to constrain the matter distribution ...
A search for optical counterparts of the complex Vela X system
(South African Institute of Physics, 2015)
The pulsar wind nebula (PWN) associated with the Vela pulsar is a bright source in the radio, X-ray and gamma-ray bands, but not in the optical. This source is very near, lying at a distance of 290 pc, as inferred from ...
A discriminative approach to harmonic emission assessment
With the onset of renewable power sources onto the network, such as Photovoltaic power plants contributing to Total Harmonic Distortion (THD) in voltage, a methodology to quantify their contribution to the THD in voltage ...