Browsing by Advisor/Supervisor
Now showing items 1-20 of 20
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The applicability of an existing tube condenser model when used with refrigerant R-407C
(North-West University, 2007)The Montreal Protocol resulted in the phase out of ozone depleting refrigerants like chloroflourocarbons (CFC) and hydrochloroflourocarbons (HCFC) used in refrigeration and heat pump applications. In heat pump applications ... -
CFD modelling of air flow through a finned coil heat exchanger to improve heat transfer and pressure drop predictions
(North-West University (South Africa), 2020)In the current study, a method of lessening computational expense and model design effort is investigated for finned coil heat exchangers (FCHXs) by using STAR-CCM+ as simulation tool. The simulation model prediction ... -
Characterization of a titanium coaxial condenser
(North-West University (South Africa)., 2020)In South Africa a leading engineering company, focusing on energy engineering services and products to the mining industry, developed a mobile refrigeration unit known as the air-cooling unit (ACU) MKII. The ACU MKII uses ... -
Design and evaluation of a vibration ore flow restore machine
(North-West University (South Africa), 2021)Ore passes provide a low cost method for gravitational transport of broken ore and waste rock through long vertical distances to lower levels of an underground mine. A hang-up or blockage in an ore pass is undesirable as ... -
Design and evaluation of a vibration ore flow restore machine
(North-West University (South Africa)., 2021)Ore passes provide a low cost method for gravitational transport of broken ore and waste rock through long vertical distances to lower levels of an underground mine. A hang-up or blockage in an ore pass is undesirable as ... -
Design, analysis and experimental evaluation of a vibration energy generator
(North-West University (South Africa)., 2023)Generating energy from ambient vibration is a method of harvesting green energy. Harvesting energy in this manner is similar to that of solar and wind energy harvesting. The vibration energy generator discussed in this ... -
Development and evaluation of an R–744 evaporator model
(North-West University, 2013)In recent years carbon dioxide (CO2, R-744) has moved to the foreground as an environmentally friendly alternative to commonly used CFCs and HFCs, which are being phased out due to its high ozone depleting and global warming ... -
Energy savings potential of CO2 heat pumps in the South African industrial sector
(North-West University (South Africa)., 2021)The South African industrial sector is the largest energy user, accounting for more than a third of the country’s energy usage and 80% of the heat demand. Heat pumps (HP) have the potential of reducing the industrial energy ... -
Energy-based fault detection and isolation in an industrial steam turbine system
(North-West University (South Africa), 2021)System monitoring, especially with the Industry 4.0 push to automate the industry, is becoming more crucial for the successful operation of industrial systems. The effective and early detection and isolation of faults is ... -
Energy-based visualisation of a transcritical CO₂ heat pump cycle
(North-West University (South Africa), 2019)The ongoing global phase-out of ozone-depleting substances under the Montreal Protocol has motivated research into alternative working fluids for the use in refrigeration applications. The use of refrigerant grade carbon ... -
Experimental determination of the forced convective boiling heat transfer coefficients of R407C in fluted-tubes
(North-West University, 2006)Due to the phase-out of all refrigerants with ozone depletion potential, a large void is left inthe refrigeration market. This void was caused due to a lack of new, ozone friendly, pure refrigerants with similar thermodynamic ... -
Investigating the dewatering energy savings potential of an open pit mine
(North-West University (South Africa), 2020)The South African mining industry is heavily reliant on its electricity supply from Eskom. Due to the increasing cost of electricity, it is crucial to reduce the consumption thereof and thereby increasing the profitability ... -
Performance predictions for oil contaminated supercritical carbon dioxide gas cooling
(North-West University (South Africa), 2019)The international movement towards using natural refrigerants has resulted in the reinvestigation of trans-critical heat pump cycles using carbon dioxide. Subsequently, a need to predict the heat transfer of oil-contaminated ... -
The simulation of a commercial-scale, hybrid solar and heat pump water heating system
(North-West University (South Africa), 2021)Due to the rotation of the earth and climatic conditions, the available solar radiation varies, not only in the 24-hour period but also daily. The latter poses a significant challenge to the designer of solar water heating ... -
Simulation of externally fired gas turbine configurations for micro-scale biomass applications
(North-West University (South Africa)., 2019)Most rural communities in South Africa are forced to rely on alternative energy resources such as biomass, gas, liquid fuels and waste materials for the provision of energy to fulfil their lighting and cooking needs since ... -
Techno-economic application of modular air cooling units for deep level mining at Mponeng
(North-West University, 2008)As mining explores greater depths beyond 4000m at Mponeng Mine the challenges of obtaining suitable working environments and complying with regulations becomes significant. These depths mean a considerable increase in the ... -
Techno-economical evaluation of domestic water heating technologies
(North-West University (South Africa), 2021)Water heating accounts for up to 40% of the total energy consumption in an average residential household. With the drastic rise in electricity prices over the last decade, the use of renewable and alternative methods of ... -
Thermal fluid modeling of small scale open Brayton cycle configurations
(North-West University (South Africa), 2019)South Africa's high dependence on coal based power stations for the country's power demand as well as the increase in demand for energy, calls for the development of more efficient energy systems that are capable of utilising ... -
Thermal fluid modelling of a titanium fluted tube condenser
(North-West University (South Africa), 2021)Heat exchangers form a vital component in numerous energy conversion processes, ranging over multiple industries; such as mining, food, automotive and aerospace. With the continuous population growth and a drive towards ... -
Thermal-fluid performance modelling of a transcritical carbon dioxide heat pump cycle
(North-West University (South Africa)., 2023)The continuous augmentation of environmental laws for refrigerants has forced the HVACR sector to re-consider natural refrigerants, with Carbon Dioxide (R744) being a promising candidate due to its competitive heat transfer ...