Solar energy use for energy savings in dairy processing plants

New Zealand is one of the world’s largest producers of dairy products and has a climate with high levels of solar radiation; however, the use of solar energy in the dairy processing industry has received limited attention. An examination of historical records found that the annual peak in New Zealand milk production and processing occurs at a time when solar radiation levels are increasing markedly. An F-Chart analysis was used to simulate the performance of large-area arrays of solar collectors and to determine their suitability for heating and cooling in a dairy processing environment. For the study four types of solar collectors were analysed: glazed flat plates, evacuated tubes, evacuated tubes with CPC reflectors and a building-integrated solar collector under development at the University of Waikato (UoW). It was found that of these echnologies, both flat plate and evacuated tubes with CPC reflectors could make useful heating and cooling contributions. Furthermore, the solar fraction was determined mainly by the collector area to storage volume ratio. Finally, it was found that the UoW building-integrated solar collector could make a significant contribution to energy use in dairies and may be an attractive future technology for the industry.

Teaching in play-based contexts

For some lay observers, play is mistakenly viewed as a leisure and uncomplicated activity done by young children. Lay observers may also see early childhood play-based settings as lacking academic opportunities for young children and may regrettably view the role of teachers in early childhood play-based contexts as simply custodial managers of chaos. However, a play-based context sets a stage for meaningful exchanges of thought that can beneficially challenge children's understandings and be particularly suitable for transforming children's everyday understandings to scientific knowledge.

While there have been shifts in theoretical approaches and differing texts on how one may view young children engaging in the human venture of science, early childhood play-based environments are settings for scientific inquiry, which can engender even the youngest of children to be critical thinkers, problem solvers, and reflectors of reason.