Browsing by Author "Madhlopa, A"

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    Assessment of perceived characteristics of solar lamps in Khayelitsha
    (IEEE, 2016-02-17) Reckson, S; Madhlopa, A
    Energy plays a vital role in the socio-economic development of any nation. Nevertheless, many people do not have access to modern energy services for lighting or other applications. Solar lamps are an innovation of modern lighting services for low-income households. In spite of the benefits associated with the adoption of solar lamps there have been few attempts for the diffusion of this technology among South Africa residences. The objective of this study was to assess perceived characteristics of solar lamps from persons in non-electrified households in Khayelitsha, Cape Town (South Africa). Such households rely predominantly on paraffin lamps and candles for lighting. The authors wished to assess public perceived characteristics of solar lamps (relative advantage, compatibility, complexity and affordability in a preliminary persuasive stage). Primary data was collected through use of a structured questionnaire (respondents completed 26). Each response - from `strongly disagree' to `strongly agree' received an integer score of 1 to 5. In addition, data reliability was determined by using Cronbach's Alpha. Results indicated most respondents perceived solar lamps as more advantageous, compatible and affordable than paraffin lamps and candles. Answers swayed more towards `disagree' on the complexity of the technology. The values of alpha ranged from 0.46 (for affordability) to 0.84 (for relative advantage, indicating solar lamps had a significant perceived relative advantage over paraffin lamps and candles.
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    Modelling radiative heat transfer inside a basin type solar still
    (Elsevier, 2014) Madhlopa, A
    Radiative heat transfer inside a basin type solar still has been investigated using two models with (model 1) and without (model 2) taking into account optical view factors. The coefficient of radiative heat exchange (hr,w-gc) between the water and cover surfaces of a practical solar still was computed using the two models. Simulation results show that model 1 yields lower values of hr,w-gc and the root mean square error than model 2. It is therefore concluded that the accuracy of modelling the performance of a basintype solar still can be improved by incorporating view factors.