Thesis (Ph. D.)--University of Wisconsin--Madison, 1961. / Typescript. Vita. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references.

Thesis (M.S.)--Univeersity of Wisconsin--Madison,1981. / Typescript. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 77-79).

Thesis (M.S.)--University of Wisconsin--Madison, 1946. / Typescript. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 122-123).

Thesis (Ph.D.)--OGI School of Science & Engineering at OHSU, Mar. 2006. / Includes bibliographical references.

Thesis (Ph. D.)--Earth and Atmospheric Sciences, Georgia Institute of Technology, 2008. / Cunnold, Derek, Committee Member ; Nenes, Athanasios, Committee Member ; Black, Robert, Committee Member ; Russell, Armistead (Ted), Committee Member ; Wang, Yuhang, Committee Chair.

Thesis (Ph. D.)--Oregon Graduate Center, 1986.

Thesis (Ph. D.)--Oregon Graduate Center, 1985.

The difficulty that exists in accurately monitoring the performance of air conditioners has made performance prediction an arduous task. Nevertheless, the performance still needs to be monitored and predicted as it helps solve a lot of problems resulting from this technology like effect of the technology on the grid, energy consumption, water utilisation and GHGs emission. With the introduction of regression modelling as a means of system monitoring and prediction some years ago, the accuracy was still a call for concern. It is worth realising that increasing the number of predictors will enhance this method’s accuracy. As such, this document intends to increase the accuracy of this method’s monitoring and predicting ability by increasing the number of predictors to cut across system thermal, environmental and human behavioural variation. These predictors experimentally gotten are used to build an environ-behavioural model that monitors the coefficient of performance and energy consumption of a domestic split-type air conditioner with higher accuracy. Refrigerants have undergone evolution in the past decades in a bid to come up with a refrigerant that has zero ODP, lower – than – R22 GWP and much better than R22 thermodynamic performance. No pure refrigerant has been found to possess these qualities as such mixtures or blends are the best shot at the moment. R410A could stand the test of time to be the long term R22 replacement but for the fact that besides R410A’s higher GWP than that of R22, the former’s system performance is lower than that of the latter’s due to the lower thermodynamic performance of the former. This means the search continues. In this document, a combination of carefully chosen refrigerant components are carefully blended to come up with a simulation based R22 long term replacement, which will be referred to in this document as BTEP.

The levels and sources of air pollution in the school community of Reiger Park, Boksburg is high and serious. This small township on the eastern outskirts of the Ekhurhuleni Metropolitan Municipality experience pollution problems that are very specific: (1) smoke from coal burning stoves and refuse burning; and (2) dust from abandoned mines or slime dams. The question of sustainable development is now on the international and national policy agendas. The concepts of ‘sustainable development’ and ‘sustainable human settlement’ have strongly emerged as priority concerns globally. Reiger Park, like many settlements in South Africa, encounters acute sustainable development problems. Indeed, the challenge of sustainable development is a national concern and priority in South Africa. Reiger Park shares characteristics of the broader developing world. Reiger Park, like many townships and communities in South Africa depends on the use of firewood and coal for cooking and heating purposes. This is problematic, releasing large amounts of smoke and carbon dioxide, which in turn pollutes the air. The pollution has widespread effects on the population, including learners within schools. This study’s main foci – education and clean air – reveals the typically degrading impact of poor quality air pollution on the education environment, posing serious threats to sustainable development of the poorer communities. Many households in the school community of Reiger Park make use of coal burning stoves for cooking and for keeping warm during the winter months. The coal that is burnt in the community, especially during winter months, releases gases into the atmosphere, which are harmful to the community. Other sources responsible for polluting Reiger Park, other than smoke from chimneys of houses, include dust from the nearby gold mine dumps, and open veldt fires and exhaust pipe emissions from automobiles. The authorities have found it difficult to control or eliminate these aspects of air pollution in the Reiger Park area. Educators were in agreement that, in the event of dust storms, classrooms are used as shelter from dust particles. Teachers and learners generally find the pollution problem in the community unbearable / Prof. H.G.van Rooyen

The turbulent flow of air through the annular gap between two tubes was studied experimentally, both with the tubes concentric and with the inner tube at eccentricities of 50% and 100%. Air velocities were measured using small traversable impact tubes. The shear stresses on the boundaries were studied both by measuring the pressure gradient and by means of a calibrated shear probe attached to the inner tube. For all three annuli complete nondimensional velocity profiles were obtained at Reynolds numbers around 55,000 and the variation of average friction factor with Reynolds number was studied in the Reynolds number range 20,000 -55,000. The variation of local shear stress around the surface of the inner tube was obtained for the eccentric annuli. The results for the concentric annulus agree well with previous investigations. For the eccentric annuli the results are compared qualitatively with Deissler and Taylor's semi-theoretical investigation. The agreement is not good and this is thought 'to show that the Deissler-Taylor method is not applicable to annuli. It is concluded that the study of velocity profiles in non-symmetrical ducts is of little help in obtaining quantitative heat transfer data. / Applied Science, Faculty of / Mechanical Engineering, Department of / Graduate