Balancing comfort expectations and greenhouse gas emissions, thermal comfort in office buildings in a changing climate

According to the Fourth Assessment Report of the Intergovernmental Panel on Climate Change (IPCC), the construction sector has the greatest potential for climate change mitigation. This work investigates the potential for climate change mitigation in naturally ventilated and mixed mode office buildings, by evaluating the range of influence of building design and occupants on greenhouse gas emissions as well as thermal and visual comfort.

Thermal comfort is evaluated according to the EN 15251 adaptive thermal comfort model, visual comfort is based on daylight autonomy and view. Parametric studies have been conducted based on building simulation for the climate of Athens, Greece. Input data are based on a literature review, and on results from a field study conducted among office occupants and architects in Athens.

The results show that the influence of occupants on greenhouse gas emissions is larger than the influence of building design. Energy saving office equipment, as well as active use of building controls for shading and lighting by occupants are crucial parameters regarding the reduction of CO2 emissions. In mixed mode buildings, the coefficient of performance of the cooling system is an important parameter as well. Regarding thermal and visual comfort, the influence of building design is predominant. A green building, well protected against heat from the sun and able to balance solar and internal heat gains, provides higher comfort levels and is less affected by the influence of occupants. In mixed mode buildings, building design is the predominant influence on the magnitude of cooling loads. A hot summer including heat waves can significantly reduce thermal comfort and increase the resulting greenhouse gas emissions. Green buildings are least affected by these influences.

The EN 15251 adaptive thermal comfort model provides a thermal comfort evaluation method valid throughout Europe. However, for the Mediterranean climate of Athens, Greece, most of the configurations investigated within this study do not meet the requirements according to this model. EN 15251 refers to an adaptive thermal comfort model for naturally ventilated and to a static model for mechanically ventilated buildings. For mixed mode buildings, the static model is recommended, but literature indicates that occupants in those buildings might be more tolerant towards higher temperatures. The hypothetical application of the EN 15251 adaptive thermal comfort model in mixed mode offices, as investigated in this study, shows potential for greenhouse gas emission savings. However, this influence is small compared to that of building design and occupants. Conclusions are drawn regarding the categorisation and exceeding criteria according to EN 15251 adaptive thermal comfort model for offices in a Mediterranean climate.

The results of this work show, that not only green buildings, but also green occupants can significantly contribute to the mitigation of the climate change. Mechanisms of the real estate market as well as the lifestyle of occupants are important influences in this context. Sustainability therefore refers to finding the right balance between occupant’s comfort expectations and resulting greenhouse gas emissions for a specific building, rather than optimisation of single parameters

Ten years of environmental university building

The authors have been involved in over ten years of environmental consulting and research on university buildings. Numerous simulations and measurement studies have occurred over this period of time. The intentions have always been to improve and optimise the environmental performing aspects of a building. This paper is a reporting of the implemented strategies, their pre-building research investigation as well as their operational outcomes. Their successes and failures are discussed here. This research is intended as a feedback loop to future design specification, commissioning and maintenance improvements. In hindsight many of the environmental concepts, when executed as planned, were successful. However, often those requiring extensive control, such as lighting, ventilation and mechanical air-conditioning were a failure. The observations between simulation and actual performance are also noted. The paper includes discussion about some of the obstacles in building procurement which can hinder the result of a good environmental performing building.

Significant challenges remain to achieve risk reduction targets for cardiovascular secondary prevention and diabetes

Objective: To examine population-level evidence treatment gaps for cardiovascular risk among rural patients with existing cardiovascular disease or diabetes.

Methods: Three population surveys were undertaken in the Greater Green Triangle region of southeastern Australia 2004-2006. Adults aged 25-84 yrs were randomly selected using age/sex stratified electoral role samples. A representative 1690 participants were recruited (48% participation rate). Anthropometric, clinical and self-administered questionnaire chronic disease risk data were collected in accordance with the WHO MONICA protocol. Detailed investigation of cardiovascular and diabetes history, key cardiovascular risk factors, medication use and health behaviours were included.

Results: After adjusting for age and sex, an estimated 12% (sample n=272) of the population had one or more of coronary heart disease, stroke, or diabetes. Blood pressure was at target (<130/80 mmHg) for 26% of these individuals, and 61% were treated with antihypertensive medications. Lipid targets were achieved by 17% for total cholesterol (<4 mmol/L), 18% for LDL cholesterol (<2 mmol/L), 77% for HDL cholesterol (>1.0 mmol/L) and 44% for triglycerides (<1.5 mmol/L); overall 6% achieved all four lipid targets and 60% reported use of lipid-lowering therapy, including 51% overall using statins. Ten percent were current smokers, and four in every five patients (82%) had suboptimal BMI (outside the range 18.5 - 25.0).

Conclusions: All participants with uncontrolled blood pressure and most with uncontrolled lipids should be taking medications. The magnitude of evidence treatment gaps suggests existing models of care need fundamental reform and renewed focus on prevention.

Does cigarette promotion increase susceptibility to smoking? : a re-test of the link between tobacco industry promotion and adolescent susceptibility to cigarette use

In 1998, using the Index of Receptivity to Tobacco Industry Promotion (IRTIP), it was claimed that tobacco promotion increased youth susceptibility to smoking. Arguably, this claim started the belief that ?cigarette advertising causes smoking? and led to many countries severely restricting cigarette promotion. The problem is, ten years lat... more »er, youth are still lighting up. Could they have gotten it wrong? The IRTIP procedure is widely used to model the link between promotional activities and susceptibility to product use. It is now being used for other products like alcohol, fast-food and colas. This book reports the results of a verification and re-test of the IRTIP model. Using the original data, it was found that IRTIP magnifies Response-Style and Respondent Drop-Out Biases. These biases are shown to lead to the finding of a positive link between tobacco promotion and susceptibility to smoking. Because the IRTIP process is biased, it may be prudent to revisit the many research studies that have used this procedure. The faulty 1998 claim may have harmed efforts to control and limit the use of cigarettes.

A stage model of intranet technology implementation and management

In the seventies, Nolan was the first to address the need for a descriptive stage theory concerning the planning, organizing, and controlling activities associated with managing the organizational computer resource. The arrival of newer technologies such as those based on the Internet calls for fresh approaches in terms of their implementation and management. Intranet technology – which is based on Internet technology – differs from other types of IT in terms of its use and implementation. We propose a four-stage model for intranet implementation and management. Each stage is portrayed by seven general characteristics. We propose that in order to ensure intranet institutionalization, three existential crises must be overcome. Firstly, if the intranet is not nurtured by a sponsor it cannot evolve beyond its experimental beginnings. Secondly, if a critical mass of both users and content cannot be reached simultaneously, the intranet will not progress. Finally, if the intranet remains uncontrolled, it will be perceived to be useless and therefore users will abandon it.

Managing the crises in intranet implementation : a stage model

In the seventies, Nolan was the first to address the need for a descriptive stage theory concerning the planning, organizing and controlling activities associated with managing the organizational computer resource. The arrival of newer technologies, such as those based on the Internet, calls for fresh approaches in terms of their implementation and management. Intranet technology, which is based on Internet technology, differs from other types of IT in terms of its characteristics, use and implementation. We propose a four-stage model for intranet implementation and management. Each stage is portrayed by seven general characteristics. We propose that, in order to ensure intranet institutionalization, three existential crises must be overcome. First, if a sponsor does not nurture the intranet, it cannot evolve beyond its experimental beginnings. Second, if a critical mass of both users and content cannot be reached simultaneously, the intranet will not progress. Finally, if the intranet remains uncontrolled, it will be perceived to be useless, and therefore users will abandon it.

Market analysis study of the value technology systems to home owners

Smart Technology involves the integration of a variety of home systems including lighting, climate control, security etc. to enhance the comfort, convenience and economy of the home for its users. It is currently unknown if home buyers believe that these systems add value to the home. This study used the market value of home sales and an attitudinal survey of home buyers, to determine the increased value of homes containing Smart Technology. The results demonstrated that a significant price premium was paid by for the incorporation of the technology into new homes. In addition, the research suggests that the use of this technology is not limited to high income earners or other demographic stereotypes. Instead it has broad market appeal and the potential to save energy for the community at large.

Analysis of the value of home automation systems

Smart technology involves the integration of a variety of home systems including lighting, climate control, security etc. to enhance the comfort, convenience and economy of the home for its users. It is currently unknown if homebuyers believe that these systems add value to the home. This study used the market value of home sales and an attitudinal survey of homebuyers, to determine the increased value of homes containing smart technology. The results demonstrated that a significant price premium was paid for the incorporation of the technology into new homes. In addition, the research suggests that the use of this technology is not limited to high-income earners or other demographic stereotypes. Instead it has broad market appeal and the potential to save energy for the community at large.

Super-realistic rendering using real-time tweening

The realism of contemporary computer graphics (and especially Virtual Reality {VR}) is limited by the great computational cost of rendering objects of appropriate complexity with convincing lighting and surface effects. We introduce a framework that allows rendering of objects in true photographic quality using tweening. The simple but effective design of our system allows us not only to perform the necessary operations in real-time on standard hardware, but also achieve other effects like morphing. Furthermore, it is shown how our system can be gainfully employed in non-VR contexts like extreme low-bandwidth video-conferencing and others.

A lightwave 3d plug-in for modelling long hair on virtual humans

Multimedia applications today make use of virtual humans. Generating realistic virtual humans is a challenging problem owing to a number of factors, one being the simulation of realistic hair. The difficulty in simulating hair is due to the physical properties of hair. The average human head holds thousands of hairs, with the width of each hair often smaller than the size of a pixel. There are also complex lighting effects that occur within hair. This paper presents a LightWave 3D plug-in for modeling thousands of individual hairs on virtual humans. The plug-in allows the user to specify the length, thickness and distribution of the hair, as well as the number of segments a hair is made up of. The plug-in is able to add hairs to a head model, which the user then modifies to define a hairstyle. The hairs are then multiplied by the plug-in to produce many hairs. By providing a plug-in that does most of the work and produces realistic results, the user is able to produce a hairstyle without modeling each individual strand of hair. This greatly reduces the time spent on hair modeling, and makes the possibility of adding realistic long hair to virtual humans reasonable.

Implementation and applications of the distortion operator

The distortion operator transforms 2D images in a manner similar to image warping or morphing, allowing source pixels to be mapped to any destination pixel. This operator can be implemented on current hardware, allowing at least one distortion per frame at interactive frame rates. Potential applications are numerous, but those described include re-mapping images for correct projection onto curved screens, correcting camera distortion from multiple sources simultaneously, and allowing constant time dynamic texturing and lighting of a static scene which is independent of geometric complexity.

Geometric approximations towards free specular comic shading

We extend the standard solution to comic rendering with a comic-style specular component. To minimise the computational overhead associated with this extension, we introduce two optimising approximations; the perspective correction angle and the vertex face-orientation measure. Both of these optimisations are generally applicable, but they are especially well suited for applications where a physically correct lighting simulation is not required. Using our optimisations we achieve performances comparable to the standard solution. As our approximations favour large models, we even outperform the standard approach for models consisting of 10,000 triangles or more, which we can render exceeding 40 frames per second, including the specular component.

FacadeUnity

FacadeUnity is an artistic software environment developed during a residency at Ars Electronica Futurelab (Linz, Austria) and supported by the Australia Council. It allows a dancer in a motion capture system to choreograph the facade lighting of the Ars Electronica building in realtime creating a dance-driven kinetic architecture.

Dramatic stage lights ON/OFF

A sound effect of stage lights coming on with a sense of drama . . . a great stinger to accompany the imagery of lights being turned on and off.