Comparison of different types air source heat pumps water heaters in South Africa

The bonding intensity of four kinds of ores from Brazil, Australia and South Africa is researched in this study, and the influence factors are analyzed. The results show that, the ores of different types have apparently differences in bonding intensity, ores from Brazil and South Africa have high bonding intensity, while ores from Australia have low bonding intensity; The foundation of generation of effective liquid is adequate liquid phase fluidity and the lower porosity of core ore; The ratio of porosity of core ore and the index of liquid phase fluidity has negative correlation with the bonding intensity.

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Riqualificazione energetica e bioedilizia in Italia: lo stato dell'arte

PRISMA Economia - Società – Lavoro ◽

10.3280/pri2011-002007 ◽

2012 ◽

pp. 74-88

Author(s):

Livio de Santoli

Keyword(s):

Energy Efficiency ◽

Renewable Energy ◽

Energy Consumption ◽

Fossil Fuels ◽

Building Materials ◽

Heat Pumps ◽

Building Envelope ◽

International Standards ◽

Solar Panels ◽

Water Heaters

Building sustainability, in term of energy efficiency, low-impact building materials, renewable energy, has experienced significant growth during the past years. In response to the growing dependence on fossil fuels and importations, due in part to the increase of energy consumption in the residential sector (in 2009 46,9 Mtep, 3% more than 2008) and the recent European directives (i.e. EU 2009/28/CE) requiring CO2 emissions cut of up to 13% in 2020, there is interest in promoting energy efficiency and renewable energy technologies, which are suitable for residential applications. In this paper we present an overview on actions related to minimization of buildings energy consumption in Italy. Prevalent line of action is to improve the energy performances of building envelope (Dlgs 192/05) using insulated frames, walls and roofs and replacing heat generators with condensing boilers. In addition to national directives, ONRE Report 2011 (National Observatory on building regulations) shows that 831 Municipalities (10% more than 2010) establish mandatory targets for insulation, photovoltaic solar panels, solar water heaters, heat pumps use, correct buildings orientation, saving of water resource and local materials use. In addiction an efficient energy rating of the buildings could promote the spread of energy efficiency measurement and consequently facilitate their implementation. The new energy rating system should meet international standards, regarding environment and energy aspects, and respect territorial needs.

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Developing and supporting coordinators of structured mentoring schemes in South Africa

SA Journal of Human Resource Management ◽

10.4102/sajhrm.v8i1.268 ◽

2010 ◽

Vol 8 (1) ◽

Author(s):

Penny Abbott ◽

Xenia Goosen ◽

Jos Coetzee

Keyword(s):

South Africa ◽

Qualitative Data ◽

Descriptive Statistics ◽

Job Description ◽

Different Types ◽

Managerial Implications ◽

People Development ◽

Value Add ◽

Purposive Sample ◽

The Coordinator

Orientation: Mentoring is considered to be such an important contributor to accelerated people development in South Africa that structured mentoring schemes are often used by organisations. There are at present few sources of development and support for coordinators of such schemes.Research purpose: The aim of this research is to discover what the characteristics of coordinators of structured mentoring schemes in South Africa are, what is required of such coordinators and how they feel about their role, with a view to improving development and support for them.Motivation for the study: The limited amount of information about role requirements for coordinators which is available in the literature is not based on empirical research. This study aims to supply the empirical basis for improved development and support for coordinators.Research design and method: A purposive sample of 25 schemes was identified and both quantitative and qualitative data, obtained through questionnaires and interviews, were analysed using descriptive statistics and thematic analysis.Main findings: Functions of coordinators tend to be similar across different types of mentoring schemes. A passion for mentoring is important, as the role involves many frustrations. There is little formalised development and support for coordinators.Practical/managerial implications: The study clarifies the functions of the coordinator, offers a job description and profile and makes suggestions on how to improve the development of the coordinator’s skills.Contribution/value-add: An understanding of what is required from a coordinator, how the necessary knowledge and skills can be developed and how the coordinator can be supported,adds value to an organisation setting up or reviewing its structured mentoring schemes.

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The choice of lucerne varieties in the Netherlands.

Netherlands Journal of Agricultural Science ◽

10.18174/njas.v1i3.17868 ◽

1953 ◽

Vol 1 (3) ◽

pp. 175-185

Author(s):

W. Scheijgrond

Keyword(s):

South Africa ◽

The Netherlands ◽

Crude Protein ◽

Dry Matter ◽

Cold Resistance ◽

The Other ◽

Southern Europe ◽

Different Types ◽

North And South America ◽

North And South

Trials were carried out at 2 stations in the Netherlands in the period 1949-51 to compare the amounts of dry matter and crude protein yielded per ha. by 5 different types of lucerne. The Northern French varieties (Du Puits, Flamande Chartain-villiers and Flamande Flandria) gave considerably higher yields of dry matter and protein than Provence or Italian lucerne. A further trial was carried out in the Netherlands in co-operation with O.E.E.C., in which the performances of varieties from Western, Eastern, Central and Southern Europe, North and South America, New Zealand, India and South Africa were compared. The results are tabulated under the following headings: yield in comparative figures, speed of regrowth after winter, earliness of flowering, degree of infestation by grasses and cold-resistance. The Northern French varieties Du Puits, Flamande Flandria, Flamande Chartainvilliers, Flamande Socheville and Flamande C49, gave higher yields of dry matter and crude protein, regrew more rapidly after winter and were less susceptible to infestation by grasses than the other varieties tested. Their cold-resistance was satisfactory. There were no considerable differences in performance between the Northern French varieties tested.-W.J.B. (Abstract retrieved from CAB Abstracts by CABI’s permission)

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The "Sangoma" or the Healthcare Center? Health-Seeking Practices of Women Living in the Mangaung Township (Bloemfontein, South Africa)

Qualitative Sociology Review ◽

10.18778/1733-8077.13.1.12 ◽

2017 ◽

Vol 13 (1) ◽

pp. 210-227

Author(s):

Naomi Yvonne Mbelekani ◽

Amanda M. Young-Hauser ◽

Jan K. Coetzee

Keyword(s):

South Africa ◽

Medical Treatment ◽

Western Medicine ◽

Social Economic ◽

Health Seeking ◽

Knowledge Gaps ◽

Narrative Study ◽

Critical Knowledge ◽

Healthcare Center ◽

Different Types

Traditional and Western medicine are both commonplace in South Africa, and are often consulted in conjunction with each other. The article aims to fill critical knowledge gaps in understanding how women as caregivers decide on medication when experiencing illness in the home. In order to achieve valid and rich in-depth understanding about the types of medicine that individuals opt for, a narrative study was conducted. The research participants are women from Bloemfontein’s townships. Analysis of the participants’ narratives suggests that there are social-economic, traditional, and cultural trajectories associated with negotiating medical treatment. The findings indicate that the context in which individuals give meaning to, diagnose, and treat illness influences their remedial choices. Accordingly, many individuals constantly shift between different types of remedies, as they believe that they yield different, but unique possibilities and solutions.

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PERFORMANCE COMPARISON OF DIFFERENT TYPES OF SOLAR WATER HEATERS UNDER EGYPTIAN CONDITIONS

Solar Energy International Progress ◽

10.1016/b978-1-4832-8437-8.50057-0 ◽

1980 ◽

pp. 778-792

Author(s):

S.W. Youssef ◽

I.A. Sakr

Keyword(s):

Performance Comparison ◽

Solar Water ◽

Water Heaters ◽

Different Types ◽

Solar Water Heaters

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Barrier plants in South Africa

Bothalia ◽

10.4102/abc.v14i3/4.1221 ◽

1983 ◽

Vol 14 (3/4) ◽

pp. 635-639 ◽

Cited By ~ 4

Author(s):

L. Henderson

Keyword(s):

South Africa ◽

Exotic Species ◽

Potential Barrier ◽

Literature Survey ◽

Indigenous Species ◽

Different Types

It is stated that there is a need both to extend the range of barrier plants available in South Africa, and to replace some much-used exotic species that have become invasive. A literature survey and computerized herbarium search revealed that of the 428 plants recorded as having been used as barriers 62% are exotics. Of these. 26% are naturalized or invasive in one or other part of South Africa. Ideal characteristics for different types of barrier plants have been defined and used as a guide in selecting a range of potential barrier plants from the indigenous species available. Lists of recognized barrier plants are given including some species revealed as a result of the present investigation.

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Performance of Heat Pump Water Heater (HPWH) Systems and Their Impacts on Electric Utility Loads

Journal of Thermal Science and Engineering Applications ◽

10.1115/1.4002757 ◽

2010 ◽

Vol 2 (2) ◽

Author(s):

Yahya I. Sharaf-Eldeen

Keyword(s):

Heat Pump ◽

Energy Savings ◽

Electric Energy ◽

Cost Savings ◽

Electric Heating ◽

Electric Utility ◽

Heat Pumps ◽

Coefficient Of Performance ◽

Water Heaters ◽

Peak Loads

This work involves measurements, analyses, and evaluation of performance of air-source heat pump water heaters (HPWHs), and their impacts on electric utility loads. Two add-on, heat pumps (HPs) rated at 7000 BTU/h (2.051 kW) and 12,000 BTU/h (3.517 kW) were utilized. The HPs were retrofitted to two 50 gal (189.3 l) electric water heaters (EWHs) with their electric heating elements removed. A third standard EWH was used for comparison. The testing setups were fully instrumented for measurements of all pertinent parameters, including inlet and outlet water temperatures, inlet and outlet air temperatures of the HPs, temperature and humidity of the surrounding air, volume of water drawn out of the storage tanks, as well as the electric energy consumptions of the systems. Performance measures evaluated included the coefficient of performance, the energy factor (EF), and the first hour rating (FHR). The HPWH systems gave EFs ranging from 1.8 to 2.5 and corresponding energy savings (and reductions in utility peak loads) ranging from 49.0% to 63.0%, approximately. The values obtained in the summer months were, as expected, somewhat higher than those obtained in the winter ones. The average values of the EFs and energy savings (and reductions in utility peak loads) were about 2.1 and 56.0%, respectively. FHR results were much lower for the HPWHs compared with those for the standard EWH. These results show that HPWHs are much more efficient compared with standard EWHs. While the average value of the EF for the EWH was about 0.92, the HPWHs yielded EFs averaging more than 2.00, resulting in annual energy savings averaging more than 50%. The results also show that HPWHs are effective at reducing utility peak loads, in addition to providing substantial cost savings to consumers.

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