Browsing Engineering by Subject "Heat pump"
Now showing items 1-9 of 9
-
The adaptive predictive control of an energy efficient central water heating system applied in the South African commercial sector
(North-West University (South Africa), Potchefstroom Campus, 2016)Since the introduction of load shedding in the latter part of 2007, Eskom, the electrical utility of South Africa, have been forced to implement energy efficient and energy management measures to ensure the stability of ... -
The analysis of an ammonia/water hybrid heat pump in the ethanol production process
(North-West University, 2008)Ethanol is a renewable energy source that could decrease society's dependence on fossil fuels, while reducing greenhouse gas emissions. Producing ethanol on a small scale on South African farms could provide farmers with ... -
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 optimisation of a solar thermal powered Aqua-Ammonia diffusion-absorption heat pump cycle under seasonal variance for residential use
(North-West University (South Africa)., 2021)The diffusion-absorption refrigerator was patented by Von Platen and Munters (1926). The conventionally low coefficient of performance and the high driving temperature have been the focus of most research since its ... -
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 ... -
The development of a model for the absorber component of an aqua-ammonia absorption heat pump
(North-West University (South Africa) , Potchefstroom Campus, 2016)In recent years, South Africa as a country has increasingly faced challenges in regards to electricity provision. Modern society is highly dependent on refrigeration technology in order to refrigerate food, not only ... -
A method for the seasonal performance rating of a residential water heating heat pump
(North-West University (South Africa) , Potchefstroom Campus, 2015)To save electricity in the South African residential market, energy efficient air source water heating heat pumps have been widely implemented in combination with conventional hot water storage vessels, also known as ... -
A methodology for the performance characterisation of a variable speed CO2 compressor
(North-West University (South Africa), Potchefstroom Campus, 2018)Heat pump cycles have a vast range of industrial applications. A refrigerant withdraws heat from a reservoir, transferring it to another fluid. In order to design and sufficiently size these cycles, accurate operating ... -
Theoretical and experimental analysis of supercritical carbon dioxide cooling
(2014)With on-going developments in the field of trans-critical carbon dioxide (R-744) vapour compression cycles, a need to effectively describe the heat transfer of supercritical carbon dioxide for application in larger diameter ...