Net Energy Analysis of Double Glazing for Residential Buildings in Temperate Climates

Energy used in buildings is a major contributor to Australia’s energy consumption and associated environmental impacts. The advent of complex glazing systems such as double glazing, particularly in northern America and Europe, has partially closed a weak thermal link in the building envelope. In milder climates, however, building envelope features may not be as effective in life cycle energy terms, i.e. including the embodied energy of their manufacture. A net energy analysis compares the savings in operational energy to the additional requirements for embodied energy, in terms of the energy payback period and energy return on investment. The effectiveness of double glazing is determined for an Australian residential building. A wide range of building operation regimes was simulated. These results support the principle of installing double glazing in residential buildings in Melbourne, Australia, at least in terms of net primary energy savings.

Net energy analysis of solar and conventional domestic hot water systems in Melbourne, Australia

It is commonly assumed that solar hot water systems save energy and reduce greenhouse gas emissions. The net energy requirement of solar hot water systems has rarely been analysed, including their embodied energy. The extent to which solar hot water systems save energy compared to conventional systems in Melbourne, Australia, is shown through a comparative net energy analysis. It was shown that the embodied energy component of the net energy requirement of solar and conventional hot water systems was insignificant. The solar hot water systems provided a net energy saving compared to the conventional systems after 0.5–2 years, for electric- and gas-boosted systems respectively.

Net energy analysis of solar and conventional domestic hot water systems in Melbourne, Australia

It is commonly assumed that solar hot water systems save energy and reduce greenhouse gas emissions. Very rarely has the life-cycle energy requirements of solar hot water systems been analysed, including their embodied energy. The extent to which solar hot water systems save energy compared to conventional systems in Melbourne, Australia, is shown through a comparative net energy analysis. The solar systems provided a net energy saving compared to the conventional systems after 0.5 to 2 years, for electricity and gas systems respectively.

Supporting adaptive learning in hypertext environment : a high level timed Petri net based approach

One problem for hypertext-based learning application is to control learning paths for different learning activities. This paper first introduced related concepts of hypertext learning state space and Petri net, then proposed a high level timed Petri Net based approach to provide some kinds of adaptation for learning activities. Examples were given while explaining ways to realizing adaptive instructions. Possible future directions were also discussed at the end of this paper.

Enhancing web-based adaptive learning with colored timed petri net

One of the issues for Web-based learning applications is to adaptively provide personalized instructions for different learning activities. This paper proposes a high level colored timed Petri Net based approach to providing some level of adaptation for different users and learning activities. Examples are given to demonstrate how to realize adaptive interfaces and personalization. Future directions are also discussed at the end of this paper.

Solar versus fossil fuels : A net energy analysis of domestic solar hot water systems in Australia

It is commonly assumed that solar hot water systems save energy and reduce greenhouse gas emissions compared to conventional electric and gas hot water systems. Very rarely has the life-cycle energy requirements (including the embodied energy of manufacture) of solar hot water systems been analysed. The extent to which solar hot water systems can save energy compared to conventional electric or gas hot water systems can be shown through a comparative net energy analysis. This method determines the ‘energy payback period’, including consideration of the difference in operational energy savings and energy embodied in the devices relative to a base case. Dr Robert Crawford, Deakin University, Australia presents the results of a net energy analysis that compared solar and conventional hot water systems for a southern (Melbourne) and a northern (Brisbane) Australian climate.

Surfing the crime net : policing, crime prevention and community safety in Australia

There can be no doubt that the Internet offers the possibility of increasing access to a range of sources of available information in a timely manner. This is particularly so as we increasingly seek to engage with information from outside our jurisdictional boundaries. While this hints at the effects of globalisation, it is also meant to be suggestive of the practical realities involved in researching (or simply following) developments occurring within emergent federal structures (for instance the European Union) or longer-standing federations such as the United States and Australia. Of course, a department or agency having a homepage and various links is only the start of the process of making information accessible. As will be indicated below, there remain significant limitations in the electronic material available from many agencies. Fortunately, there are also a number of organisations that enable the researcher to access original data and research publications.

Newsgathering on the net

The Internet and other aspects of computer-assisted reporting (CAR) have the potential to revolutionise the newsgathering process. This book analyses and explains all of the CAR tools and techniques available on the Internet. Each chapter also contains exercises for practice and a reading list.

Supporting adaptive learning in hypertext environments : a high level timed Petri net-based approach

A problem for hypertext-based learning application is to control learning paths for different learning activities. This paper first introduces related concepts of hypertext learning state space and high level Petri Nets (PNs), then proposes a high level timed PN based approach used to providing kinds of adaptation for learning activities by adjusting time attributes of targeted learning state space. Examples are given while explaining ways to realising adaptive instructions. Possible future directions are also discussed at the end of this paper.

Design of electrical infrastructure at container terminal and 'net metering'

Net metering is generally a consumer-based incentive for renewable sources such as wind or solar power systems also referred to as dasiacogenerationdasia. It is still a grey area for container terminals with large electric machines, such as quay cranes, automatic stacking cranes, that can operate in the regenerative mode and export electric energy to the grid. With actual measured electrical data presented for discussion, this paper provides information for the readers to provide a better understanding of their access to net metering, ultilizing their electrical equipment capabilities and be informed for their next negotiation with the power supply company.

Designing collaborative e-learning for the net generation

The designer of higher education programs is on the cusp of some very exciting resource development particularly in the area of postgraduate coursework. Part of this is because of the new learner, a millennial or net generation learner who is time-poor, a networker with strong inclinations towards social or community knowledge pooling and a multiple media literacy which is comfortable in virtual worlds and with visual emphasis. The other element is the perceived changing role of the university or higher education in the transfer of knowledge, moving from a transmission or narrative model to learner-centred and performative approaches. This has been highlighted by greater emphasis on experiential learning methodologies, and the development of action learning practices. The nexus of these two influences, the new learner and the higher education response to delivering learning, may be elaborated further from learning theory which seems to be moving beyond social constructivist approaches, or certainly encompassing what is referred to as connectivism.

This may be a new theoretical approach, or it could simply be an organic growth in meeting the needs of large numbers of higher education student participants who perceive a degree as a skills-based workplace preparation. Whatever the theoretical underpinning may be, the large numbers of learners moving to postgraduate coursework or more workplace oriented programs and subjects has thrown out the challenge to instructional designers to provide just-in-time, relevant and socially transferred learning with strong creative and imaginative engagement.

The case studies incorporated in this paper provide two separate approaches to these challenges - one is a workplace oriented postgraduate team project in a Masters in Communication, the other provides a virtual simulation for developing creative and professional writing skills at postgraduate levels. They both provide perspectives on the net generation learner and collaborative and connected learning models.