High performance low-energy buildings

The era of legislation and creditable methods towards producing sustainable buildings is upon us. Yet, a major barrier to achieving environmental responsive design is in the lack of available information at the programming or pre-design phases of a project. The review and evaluation of climate as well as energy-efficient strategies could be difficult to consider at these preliminary stages. Until recently, introducing energy simulation tools at the design stage has been difficult and perhaps next to impossible at a pre-design or programming stage. However, analysis of this sort is essential to &lsquo;green building rating&rsquo; or performance assessment schemes such as LEED (Leadership in Energy and Environmental Design) and BREEAM (Building Research Establishment Environment Assessment Method). This paper discusses the implementation of a particular tool, ENERGY-10, where &lsquo;basecase&rsquo; building defaults are compared to a low-energy case which has applied multiple energy-efficient strategies automatically. An annual hour-by-hour simulation provides a daylighting calculation with a subsequent thermal evaluation. Calculation results provide energy consumption, peak load equipment sizing, a RANK feature of the energy-efficient strategies, reporting of CO2, SO2 and NOx reduction, optimum glazing type as well as excellent graphic output. Consideration is given as to the approach of how such information can be introduced into the building project brief enforcing a low-energyperformance target.<br /

Developing an ‘as performing’ building assessment

The building profession is increasingly becoming more demanding with respect to building environmental performance. Intentions are to provide best practices into our buildings. In part, this is a response due to the Australian government and other independent organisations that have developed policy on rating tools and performance ranking measures, all with the intention of accomplishing environmentally sustainable buildings.With rating systems endorsing innovative environmental design solutions, it could be asked: Are our buildings really operating as rated? Do we know whether our designs are in compliance with what was calculated or simulated? Is there a feedback loop informing the design process on successes or failures in our designs or mechanical services?While ratings continue to focus on &lsquo;by design&rsquo; or &lsquo;as built&rsquo; rewards, few tools acknowledge perhaps the more crucial bottom line: &lsquo;as performing&rsquo;. With the exception of an AGBR (Australian Green Building Rating) scheme on actual annual energy consumption, there appears to be no &lsquo;as performing&rsquo; assessment. Furthermore, practically every building is a prototype (a one-off) and requires commissioning, programming and scheduling of its services. It would certainly appear that as stakeholders (the procurers, owners, facilities managers and users) of the newly built environment, that what we really want to know is actual on-site confirmation of performance. It is the objective of the Mobile Architecture and Built Environment Laboratory (MABEL), to provide such a service.<br /

Towards prefabricated sustainable housing - an introduction

Prefabricated building systems are once again gaining popularity. The new prefabricated paradigm offers the integration of several approaches previously ignored: automated manufacturing, integrated building services and environmental sustainable principles. Consistency, predictable environmental control, modular flexibility, quick assembly and affordability are promising features of modern manufactured construction. Though the concept of prefabricated building is not new, this type of construction may be the only hope in obtaining a truely sustainable architecture for our future.This paper attempts to define and evaluate several prefabricated building systems, ranging from a &lsquo;kit-of-parts&rsquo; to fully assembled &lsquo;volumetric&rsquo; modules. It aims to categorise various manufactured types among a vast amount of information, and to observe their attributes regarding materials, flexibility, structural integrity, delivery and constructability. This paper suggests that pre-fabricated architecture can deliver high order design and diversity within the framework of waste reduction, renewable systems integration and optimal performance. <br /

A time for real building performance measurement

The Mobile Architecture and Built Environment Laboratory (MABEL) was conceived upon the principle of investigating building environmental performance in situ. MABEL provides the first means of integrated, on-site measurement of the key aspects of internal built environments; energy, lighting, air quality, ventilation, acoustics and comfort using state-ofthe- art technology and instrumentation. The intention of this paper is to explain the how and what need to be measured in our buildings if we are to search of a genuine performance answer as well as the information to provide a solution. Several results of real building measurement are provided here, suggesting that a national program on \u27as performing\u27 is required if we are to proceed in a sustainable manner.<br /

A new paradigm for sustainable residential buildings

This paper explores a new paradigm in housing, where dwellings will be pre-fabricated, modular, energy efficient, transportable and use renewable and/or recyclable resources. The paper reviews previous attempts to produce housing, which meets some of the criteria for this new paradigm. Their advantages and disadvantages are discussed. An approach towards a new type of modular prefabricated unit is proposed. A preliminary energy analysis, comparing a present relocatable classroom construction with one upgraded, is provided as an example towards low energy building operation. Finally, conclusions are drawn about the requirements of future housing if we are to progress towards sustainability.<br /

Realising air leakage in Australian housing

Air tightness of Australian buildings is a great unknown. Despite testing methods being developed and implemented in many advanced European and North American countries, this has not happened in Australia. This paper notes energy efficiency gains that can be achieved through tighter construction, and follows on from the investigation into testing methodology and literature discussed in TEC 23: Air Leakage in Buildings &ndash; Review of International Literature and Standards. Several domestic case studies are used to implement two accepted testing methods and aid to build the case for increased awareness of airtight housing in Australia. <br /

Teaching building services to architecture and building students

Building environmental services can often be categorised as &lsquo;one of the least desirable courses&rsquo; in the curriculum of architecture and building. Nevertheless, it is also one of the most important and confronting subjects in the procurement of real building projects. The principal message to designers is that of spatial requirements while to the builders it may become one of capital cost, installation specifications and maintenance of equipment. Getting these concepts across in a creative, yet project oriented, manner can be challenging to the students and to the lecturer. This paper presents the developments of ten years of teaching the subject, as well as the methods of delivery which have proven to be successful.<br /

Ventilation research on Australian residential construction

This paper applies established testing methods used to discover the ventilation performance of various residential building envelope construction in Australia. Under the definition of \u27ventilation performance\u27 we imply the building envelope leakage (or infiltration) the living space air change rates, the volumetric flow rates and the pathways of air flow between subfloor, room volume and roof spaces. All of the methods applied and discussed here are on-site, evidencebased performance of actual structures as tested by the Mobile Architecture &amp; Built Environment Laboratory and Air Barrier Technologies.<br /