<div> <p>The residential building sector is one of the most energy intensive sectors in today’s civilization. With population growth and a rise in number of homeowners the effect is bound to worsen. A wave of green and sustainable strategies is on the rise hoping to moderate some of the negative effect on the environment. From embracing renewable sources of energy as an alternative to fossil fuels, to improving existing home systems to become more efficient, the construction industry is evolving into becoming more energy conscious. One of the biggest obstacles to this wave is a lack of awareness and a fear of initial costs among contractors, homeowners and clients alike. This research will use Life Cycle Cost Analysis on a varying combination of residential energy systems and the researcher hopes to establish the trade-off between initial investment and long-term benefits. The case being considered is a residence located in Indiana, US. Using past and current utility bills and energy simulation data of different energy consuming systems in the residence over its lifetime, economic models are generated. This research establishes that a combination of passive and active energy conservation measures results in the lowest life cycle cost. The study will be beneficial for further research and as a framework for residential life cycle cost analysis.</p></div>

No Brasil e em São Paulo, a ASHRAE Standard 90.1 Energy Standard for Buildings Except Low-Rise Residential Buildings ganhou rápida aceitação nos últimos anos. A norma é referenciada pelo sistema de certificação Leadership in Energy and Environmental Design - LEED para estabelecer padrões mínimos de desempenho energético. Apesar do desenvolvimento de atividade de consultoria para comprovação de conformidade com esse código, a consultoria tem se limitado a intervir no projeto de arquitetura após sua concepção. A fim de investigar a influência da arquitetura no desempenho de edifícios de escritório e justificar a consultoria desde as primeiras etapas do projeto, o desempenho de uma série de modelos é estimado com auxílio da ferramenta de simulação computacional EnergyPlus. As alternativas avaliadas incluem diferentes percentagens de área de fachada envidraçada, propriedades ópticas e térmicas dos fechamentos transparentes, persianas automatizadas, orientação do edifício e proporções do pavimento tipo. Os resultados comprovaram a influência da arquitetura no desempenho energético de edifícios de escritório. Portanto, as decisões tomadas durante a fase de concepção do projeto têm impacto considerável no desempenho final do edifício e, apesar do tempo e dos esforços necessários, devem ser estudadas. / In Brazil and Sao Paulo, ASHRAE Standard 90.1 Energy Standard for Buildings Except Low-Rise Residential Buildings has rapidly gained acceptance in recent years. The standard is referred by the Leadership in Energy and Environmental Design - LEED rating system to set minimum energy performance levels. Although consulting activity was developed to demonstrate compliance to the code, it has been limited to intervene in the architectural design after its conception. With the aim of investigating the influence of architecture on the performance of office buildings and justify the consultancy since early design stages, the performance of a set of models is estimated using EnergyPlus computer simulation tool. The assessed alternatives include different Window-to-Wall Ratios - WWR, optical and thermal properties of glazing systems, automated roller shades, building orientation and proportions of typical floors. The results confirmed the influence of architecture on the energy performance of office buildings. Therefore, decisions taken during early design stages have considerable impact on the final performance of buildings and, despite the time and effort involved, should be studied.

No Brasil e em São Paulo, a ASHRAE Standard 90.1 Energy Standard for Buildings Except Low-Rise Residential Buildings ganhou rápida aceitação nos últimos anos. A norma é referenciada pelo sistema de certificação Leadership in Energy and Environmental Design - LEED para estabelecer padrões mínimos de desempenho energético. Apesar do desenvolvimento de atividade de consultoria para comprovação de conformidade com esse código, a consultoria tem se limitado a intervir no projeto de arquitetura após sua concepção. A fim de investigar a influência da arquitetura no desempenho de edifícios de escritório e justificar a consultoria desde as primeiras etapas do projeto, o desempenho de uma série de modelos é estimado com auxílio da ferramenta de simulação computacional EnergyPlus. As alternativas avaliadas incluem diferentes percentagens de área de fachada envidraçada, propriedades ópticas e térmicas dos fechamentos transparentes, persianas automatizadas, orientação do edifício e proporções do pavimento tipo. Os resultados comprovaram a influência da arquitetura no desempenho energético de edifícios de escritório. Portanto, as decisões tomadas durante a fase de concepção do projeto têm impacto considerável no desempenho final do edifício e, apesar do tempo e dos esforços necessários, devem ser estudadas. / In Brazil and Sao Paulo, ASHRAE Standard 90.1 Energy Standard for Buildings Except Low-Rise Residential Buildings has rapidly gained acceptance in recent years. The standard is referred by the Leadership in Energy and Environmental Design - LEED rating system to set minimum energy performance levels. Although consulting activity was developed to demonstrate compliance to the code, it has been limited to intervene in the architectural design after its conception. With the aim of investigating the influence of architecture on the performance of office buildings and justify the consultancy since early design stages, the performance of a set of models is estimated using EnergyPlus computer simulation tool. The assessed alternatives include different Window-to-Wall Ratios - WWR, optical and thermal properties of glazing systems, automated roller shades, building orientation and proportions of typical floors. The results confirmed the influence of architecture on the energy performance of office buildings. Therefore, decisions taken during early design stages have considerable impact on the final performance of buildings and, despite the time and effort involved, should be studied.

The Military Health System (MHS) is a worldwide network of healthcare facilities and personnel. The healthcare facility inventory is aging and requires extensive facility management, renovations and replacement construction to maintain the environment of a high quality of care. Recent developments in sustainability and evidence-based design (EBD) have created additional requirements for the design and construction of facilities. These areas of design emphasis, sustainability and EBD, are developing best practices according to the respective theory. Existing facilities in the MHS have been directed to undergo restoration and modernization by Department of Defense (DoD) civilian leadership. Governmental directives have mandated that these restorations and new construction complies with current building codes and that EBD design features be included in healthcare facility planning. The hospital building type has changed over history due to innovations in building technology, such as HVAC and steel frame construction, as well as healthcare initiatives, such as treatment of tuberculosis and the mentally ill. The design concepts of environmental sustainability and EBD are currently altering the hospital typology. Building professionals have found significant differences in facilities that are categorized as evidence-based and those noted as sustainable. The future of successful healthcare designs relies on a balance of these concepts. The hospital building type has one of the highest energy intensities out of all commercial building types. Hospitals have become more energy intense due to the evolution of the deep-plan hospital. The design of the building envelope is the most lasting feature affecting the energy use of a hospital, due to its service-life typically equaling the life of the facility. The building envelope design consists of the shape of the building, material selection, as well as its orientation. This research demonstrates the relationship between incorporating positive building occupant features, such as increased day lighting and views of nature, and efficient energy design choices. The use of energy simulation software and early design collaboration between multiple professional disciplines is recognized as critical to optimal design solutions.

This study examines the use of building modeling and energy simulations in the design process  of  a  building.  The  take-off  point  is  the  notion  of  energy  simulations  being needed early and throughout the building design process, and that the lack of energy simulations may be explained by the fact that they are time consuming and therefore often too expensive. A greater interoperability between software tools used by relevant disciplines,  such  as  the  architect  and  the  energy  specialist,  would  create  smoother workflows, which would reduce this cost and open up for more frequent and iterative energy  simulation  processes.  The  study  is  an  assessment  of  the  modeling  tool  Revit and  the  simulation  tool  Virtual  Environment  and  whether  they  can  create  smoother workflows, and make leeway for a more frequent use of energy simulations throughout the  design  process.  It  also  investigates  the  limitations  of  what  can  be  examined  by simulations in Virtual Environment. This will hopefully help clarify the future role of energy  simulations  in  design  processes.  The  method  is  a  trial  by  error  approach  of testing the two software tools by building and simulating a model. The results of these tests  show  that  the  workflow  is  not  optimal  (and  therefore  time  consuming)  for frequent  and  iterative simulations  throughout the  design  process,  but  it  also  reveals some  great  possibilities  of  what  can  be  performed  with  these  two  powerful  tools  at hand.  Further  development  with  regards  on  platform  independency  of  the  building information  model,  including  seamless  exporting  and  importing,  seems  necessary  to strengthen the future role of energy simulations.

Previous studies in building energy assessmnet have made it clear that the largest potential energy efficiency improvements are conected to the retrofitting of existing buildings. But, lack of information about the building stock and associated modelling tools is one of the barriers to assessment of energy efficiency strategies in the building stocks. Therefore, a methodology has been developed to describe any building stock by the means of archetype buildings.  The aim has been to assess the effects of energy saving measures. The model which is used for the building energy simulation is called:  Energy, Carbon and Cost Assessment for Buildings Stocks (ECCABS). This model calculated the net energy demand aggregated in heating, cooling, lighting, hotwater and appliances.   This model has already been validated using the Swedish residential stock as a test case. The present work continues the development of the methodology by focusing on the UK building stock by discribing the UK building stock trough archetype buildings and their physical properties which are used as inputs to the ECCABS. In addition, this work seekes to check the adequacy of applying the ECCABS model to the UK building stock. The outputs which are the final energy use of the entire building stock are compared to data available in national and international sources.   The UK building stoch is described by a total of 252 archetype buildings. It is determined by considering nine building typologies, four climate zones, six periods of construction and two types of heating systems. The total final energy demand calculated by ECCABS for the residential sector is 578.83 TWh for the year 2010, which is 2.6 % higher than the statistics provided by the Department of Energy and Climate Change(DECC). In the non-residential sector the total final energy demand is 77.28 TWh for the year 2009, which is about 3.2% lower than the energy demand given by DECC. Potential reasons which could have affected the acuracy of the final resualts are discussed in this master thesis.

The cost of design, construction and maintenance of facilities is on continual rise. The demand is to construct facilities which have been designed by apply life cycle costing principles. These principles have already given strong decision making power to the manufacturing industry. The need to satisfy the environmental sustainability requirements, improve operational effectiveness of buildings and apply value engineering principles has increased the dependency on life cycle costing analysis. The objective is to obtain economically viable solutions by analyzing the alternatives during the design of a building. Though the LCCA process is able to give the desired results, it does have some problems which have stood as hindrances to the more widespread use of the LCCA concept and method. The literature study has highlighted that the problem areas are the lack of frameworks or mechanisms for collecting and storing data and the complexity of LCCA exercise, which involves the analysis of a thousand of building elements and a number of construction-type options and maintenance activities for each building element at detailed design stages. Building Information Modeling has been able to repeatedly answer the questions raised by the AEC industry. The aim of this study is to identify the areas where BIM can be effectively applied to the LCCA process and become a part of the workflow. In this study, initially four LCCA case studies are read and evaluated from the point of view of understanding the method in which the life cycle costing principles have been applied. The purpose, the type alternatives examined, the process of analysis, the type of software used and the results are understood. An attempt has been carried out to understand the workflow of the LCCA process. There is a confidence that Building Information Modeling is capable of handling changes during the design, construction and maintenance phases of the project. Since applying changes to any kind of information of the building during LCC analysis forms the core, it has become necessary to use computer building models for examining these changes. The building modeling softwares are enumerated. The case studies have highlighted that the evaluation of the alternatives are primarily to achieve energy efficient solutions for the buildings. Applying these solutions involves high initial costs. The return on investment is the means by which these solutions become viable to the owners of the facilities. This is where the LCCA has been applied. Two of the important cost elements of the LCC analysis are initial costs and the operating costs of the building. The collaboration of these modeling tools with other estimating software where the initial costs of the building can be generated is studied. The functions of the quantity take-off tools and estimating tools along with the interoperability between these tools are analyzed. The operating costs are generated from the software that focuses on sustainability. And the currently used tools for performing the calculations of the life cycle costing analysis are also observed. The objective is to identify if the currently available BIM tools and software can help in obtaining LCCA results and are able to offset the hindrances of the process. Therefore, the software are studied from the point of view of ease of handling data and the type of data that can be generated. Possible BIM workflows are suggested depending on the functions of the software and the relationship between them. The study has aimed at taking a snapshot the current tools available which can aid the LCCA process. The research is of significance to the construction industry as it forms a precursor to the application of Building Information Modeling to the LCCA process as it shows that it has the capacity of overcoming the obstacles for life cycle costing. This opens a window to the possibility of applying BIM to LCCA and furthering this study.

The aim of this study was to investigate the thermal performance of residential units in the Middle East Technical University (METU) Campus, Ankara. The study was conducted on the unoccupied residential units to eliminate the occupant interventions. There were only three unoccupied residential units in the study period, hence sample was considered as randomly selected. Case study units were triplex row houses and all physical characteristics were identical apart from their orientations. The thermal performance of these three residential units was assessed by compiling data on temperature and relative humidity from a number of their rooms on certain days in January and February. The study was conducted in winter months, because heating loads are more significant than cooling loads for energy consumption in Ankara / the measurement period was determined according to the coldest days of the year. In this context, the temperature and humidity charts were evaluated and one of the units was simulated using the software tool Ecotect v.5.20. The simulation temperature charts demonstrate similar behavior and trends as the measured temperature / although, it was approximately 4 0C lower than the measured temperature. The possible reason for such a difference may be the precision of the material properties. Six different calibrations were tested by changing the thermal properties of the envelope materials to obtain comparable results with the measured temperature readings. Based on the calibrated model, it was found that an increase in the U-value of the envelope materials did not have a significant effect on the simulated temperature charts.

This study addresses 5 uncertainties that exist in the operation of HVAC systems, which will presumably affect the actual energy consumption of the HVAC system in comparison to the consumption under idealized bahavior. We consequently add these parameters and their uncertainty range into the source code, eventually resulting in an EnergyPlus program in which the HVAC operation uncertainty is embedded as so-called model form uncertainty. The upgraded EnergyPlus is tested for each parameter uncertainty separately, and to show the impact of each uncertainty albeit for hypothetical uncertainty ranges of the parameters.

This research examined what mix of building types result in the most efficient use of a technology known as Aquifer Thermal Energy Storage (ATES). Hourly energy simulation models for six different building archetypes were created based on representative building characteristic and energy use data from the Toronto area. A genetic algorithm optimization tool was then created to vary scheduling and production properties of the ATES system and the relative number of different building archetypes. The tool found that a cooling season from weeks 16‐42 maximized the useful energy output of the ATES and resulted in roughly 30% reduction in heating and cooling energy use and associated GHG emissions. It was also found that creating a mix consisting of a higher percentage of larger buildings than is currently found in most neighbourhoods could reduce energy usage by an additional 10%.