Organizational Unit:

School of Architecture

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Organizational Unit

College of Design

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https://finding-aids.library.gatech.edu/agents/corporate_entities/1120

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Publication Search Results

Now showing 1 - 10 of 14

Guidelines to integrate life cycle assessment in building design

(Georgia Institute of Technology, 2009-11-17) Joshi, Surabhi

As the architecture and construction industry places an increased emphasis on sustainability, building researchers are seeking more comprehensive methods to evaluate and reduce a building's environmental impacts. Life Cycle Assessment (LCA) has emerged as one of the most capable tools to aid in this assessment. Presently there are no guiding principles for the use of LCA in the building industry. This thesis aims to provide guidelines to help architects utilize LCA methodology as part of the design process. This study reviews a number of previously-completed whole-building LCA case-studies to understand different LCA scenarios of use in the building industry. In addition, a set of North American and international LCA tools were evaluated for their utility in different scenarios. The state of research was assessed to find answers to some critical issues concerning LCA. Based on these analyses, a number of scenarios of use of LCA were identified and a set of guidelines was proposed to conduct LCA for buildings. It was concluded that the present use of LCA is limited due to limited tool capabilities, deficient databases and lack of a building-specific methodology. The study recognizes these limitations and recommends specific research opportunities for future researchers. However, it is concluded that approximate LCA results obtained from the tools available today can be useful in informing design-decisions, keeping in mind the lack of precision in the results.
Risk-conscious design of off-grid solar energy houses

(Georgia Institute of Technology, 2009-11-16) Hu, Huafen

Zero energy houses and (near) zero energy buildings are among the most ambitious targets of society moving towards an energy efficient built environment. The "zero" energy consumption is most often judged on a yearly basis and should thus be interpreted as yearly net zero energy. The fully self sustainable, i.e. off-grid, home poses a major challenge due to the dynamic nature of building load profiles, ambient weather condition and occupant needs. In current practice, the off-grid status is accomplishable only by relying on backup generators or utilizing a large energy storage system. The research develops a risk based holistic system design method to guarantee a match between onsite sustainable energy generation and energy demand of systems and occupants. Energy self-sufficiency is the essential constraint that drives the design process. It starts with information collection of occupants' need in terms of life style, risk perception, and budget planning. These inputs are stated as probabilistic risk constraints that are applied during design evolution. Risk expressions are developed based on the relationships between power unavailability criteria and "damages" as perceived by occupants. A power reliability assessment algorithm is developed to aggregate the system underperformance causes and estimate all possible power availability outcomes of an off-grid house design. Based on these foundations, the design problem of an off-grid house is formulated as a stochastic programming problem with probabilistic constraints. The results show that inherent risks in weather patterns dominate the risk level of off-grid houses if current power unavailability criteria are used. It is concluded that a realistic and economic design of an off-grid house can only be achieved after an appropriate design weather file is developed for risk conscious design methods. The second stage of the research deals with the potential risk mitigation when an intelligent energy management system is installed. A stochastic model based predictive controller is implemented to manage energy allocation to sub individual functions in the off-grid house during operation. The controller determines in real time the priority of energy consuming activities and functions. The re-evaluation of the risk indices show that the proposed controller helps occupants to reduce damages related to power unavailability, and increase thermal comfort performance of the house. The research provides a risk oriented view on the energy self-sufficiency of off-grid solar houses. Uncertainty analysis is used to verify the match between onsite sustainable energy supply and demand under dynamic ambient conditions in a manner that reveals the risks induced by the fact that new technologies may not perform as well as expected. Furthermore, taking occupants' needs based on their risk perception as constraints in design evolution provides better guarantees for right sized system design.
Real-Time Adaptive Systems for Building Envelopes

(Georgia Institute of Technology, 2007-11-15) Deo, Vishwadeep

The thesis attempts to investigate the issues pertaining to design, fabrication and application of real-time adaptive systems for building envelopes, and to answer questions raised by the idea of motion in architecture. The thesis uses the Solar Decathlon Competition as a platform to base all the research and consequently to verify their applications. Photo-voltaic (PV) panels and shading devices are two different components of Georgia Institute of Technology s the Solar Decathlon House, located above the roof, that are based on the concept of Homeostasis or self-regulated optimization. For the PV panels, the objective is to optimize energy production, by controlling their movement to track the changing position of Sun, whereas, the objective for the shading devices is to reduce heating or cooling loads by controlling the position of shading devices, thus controlling direct and diffused heat gains through the roof. To achieve this adaptive feature, it required three layers of operations. First was the design of the mechanics of movement, which tried to achieve the required motion for the PV panels and shading devices by using minimum components and parameters. Second was the design of the individual parts that are consistent with the overall concept of the House. And finally, the third layer is the design of controls that automates the motion of the PV panels and Shading Devices, using a set of sensors that actuate the attached motors. As a final product, there is an attempt to integrate the precision and material efficiency of digital fabrication with the self-regulated optimization of the roof components.
Virtual World: Observe, Interact & Simulate

(Georgia Institute of Technology, 2007-07-10) Phor, Pallavi

This thesis researches the potential for using Virtual Worlds as an advanced environment for interaction and simulation besides observation. Tables, matrices and scenarios have been developed to illustrate upfront, the route that can be taken to develop an advanced virtual environment. The paper attempts to build a dialogue for designers, to gauge the requirements of a client and thereby propose a schedule of deliverable, time and cost, in a pre-project phase.
A Project Planning Guide for Healthcare Facility Owners

(Georgia Institute of Technology, 2007-04-09) Walrath, Bryan James

According to a recent study, about 30 percent of U.S. real estate projects are canceled midstream, while more than half run up to 190 percent over budget and 220 percent over the initial time estimate. The reasons for this are manifold but poor decisions during the initiation and early planning of the project can be pointed to as main causes. Most poor decisions stem from lack of information, bad judgment, and lack of communication and transparency between what the client expects and what the project team can deliver. Proper project planning procedures and methods will lead to proper contingency planning, management of partner relationships and contracts, management of dynamic change and associated risks that can, and most probably will, occur in the course of the project. The role of the owner cannot be overstated in all of these targets. Historically, the owners of healthcare facilities have a once in a lifetime involvement in the planning, design and construction (or major renovation) of their facility. The interaction with planners, public bodies, architects, engineers, and other entities is a daunting prospect for which an owner will seek help from specialized firms that represent the owner. This guide may serve as a healthcare project planning guide for owners, and in particular CEOs, to navigate the process. It will prepare the owner to recognize the major tasks and decision steps throughout project planning, while keeping the focus on the desired outcome. Any owner should recognize that the slogan: if you dont know what you want, you will not get what you need is as true today as it ever was. This guide will include research, best practices from industry experts, and a case study on the New Orleans public healthcare planning process post-Hurricane Katrina.
The use of formal methods for decision making in the planning phase of healthcare facilities

(Georgia Institute of Technology, 2007-04-09) Lima, Clarissa Sucupira Andrade

The Pre-Project Phase of building construction manages the communication between client organization, user groups and designers. Disconnects and miscommunication in this phase may result in a product that does not fulfill the expectations of the parties involved. It is expected that the adoption of more formal methods can streamline the communication and improve its precision. Based on a literature review, a triage of methods is introduced: (a) a method for initial criteria management, supported by the EcoProP software (developed by VTT in Finland); (b) a method to rationalize and manage criteria in relation to the design organizational instruments, supported by the QFD ProP software (developed by VTT in Finland); (c) a method that supports multi criteria decision making, supported by a range of commercially available software tools. In order to assess the effectiveness of these tools they have been applied in the specific case of Pre-Project Phase of a healthcare facility. A Case Study on a concrete discrete decision problem is dealt with. It concerns the choice between a central medication room and patient room dispenser closets (also known as Nurservers). The Nurservers Case Study is used to evaluate the applicability of the proposed criteria gathering, ranking and decision methods in the Pre-Project Phases daily practices. The claim that these rational methods increase efficiency, precision and satisfaction of the parties involved in this phase is investigated. The thesis evaluates how the introduction of rational methods benefits the communication between stakeholders.
Process-mediated Planning of AEC Projects through Structured Dialogues

(Georgia Institute of Technology, 2005-11-18) Verheij, Johan Michiel

Project planning in the Architecture, Engineering and Construction (AEC) industry at present relies heavily on individual skills, experience and improvisation. In an attempt to increase predictability and efficiency, and to improve knowledge retention across projects, this thesis proposes a more systematic approach to project planning. It does so by introducing the notion of a meta-process model that embodies and cultivates the logic and intelligence of incremental and collaborative planning activities in a given domain. Planning tasks are encoded and enforced as a set of structured dialogues between project partners. To make this possible, a taxonomy extension to current workflow modeling technology is introduced. The concept of the chosen approach can thus be classified as process mediation through structured dialogues. It is applied to the particular example case of Design-Build project delivery for which a detailed workflow model was created. This model serves as a partial instantiation of the larger Project Management Body Of Knowledge, an abstract framework put forward by the US Project Management Institute. A prototype system architecture is devised as an extension to an existing collaborative virtual environment developed in the European e-HUBs research project. This experimental Web-based platform supports the enactment of workflows that are expressed in the standardized syntax of the neutral process definition language XPDL. The functional richness of the structured dialogue extensions is demonstrated through a dialogue management prototype developed as a separate MS Access database application.
A method to predict reverberation time in concert hall preliminary design stage

(Georgia Institute of Technology, 2005-10-04) Zhang, Yan

A historical review is performed to study the impact of acoustical knowledge on concert hall developments. It shows that although acoustics developed from myth to real science, there is still a gap between its fast growing knowledge and relatively slow applications to improve designs. Architectural acoustics research and education shall help populating the tacit knowledge and experience of acousticians to reduce the gap between design and knowledge. The established paradigm in this field is to identify the performance goals of concert halls, recognize the available design information in different stages, and establish models to link them together. Placed in this general picture, this thesis focuses on providing design support for preliminary stage. It develops a model to link accessible design features with the most important acoustics performance index, reverberation time. A literature review on exiting reverberation time prediction methods shows that they are based on either too demanding or over-simplified for this stage. This study intends to develop a model that makes maximum use of available information and improves prediction accuracy in comparison with existing simplified methods. Through literature survey and data analysis, three factors (geometrical shape, non-uniform material distribution and scattering effect) are recognized as significant for reverberation time prediction. This thesis developed a simplified model taking these factors into consideration and calibrated this model with empirical data through Bayesian statistical method.
Assessing Mold Risks in Buildings under Uncertainty

(Georgia Institute of Technology, 2005-07-15) Moon, Hyeun Jun

Microbial growth is a major cause of Indoor Air Quality (IAQ) problems. The implications of mold growth range from unacceptable musty smells and defacement of interior finishes, to structural damage and adverse health effects, not to mention lengthy litigation processes. Mold is likely to occur when a favorable combination of humidity, temperature, and substrate nutrient are maintained long enough. As many modern buildings use products that increase the likelihood of molds (e.g., paper and wood based products), reported cases have increased in recent years. Despite decades of intensive research efforts to prevent mold, modern buildings continue to suffer from mold infestation. The main reason is that current prescriptive regulations focus on the control of relative humidity only. However, recent research has shown that mold occurrences are influenced by a multitude of parameters with complex physical interactions. The set of relevant building parameters includes physical properties of building components, aspects of building usage, certain materials, occupant behavior, cleaning regime, HVAC system components and their operation, and other. Mold occurs mostly as the unexpected result of an unforeseen combination of the uncertain building parameters. Current deterministic mold assessment studies fail to give conclusive results. These simulations are based on idealizations of the building and its use, and therefore unable to capture the effect of the random, situational, and sometimes idiosyncratic nature of building use and operation. The presented research takes a radically different approach, based on the assessment of the uncertainties of all parameters and their propagation through a mixed set of simulations using a Monte Carlo technique. This approach generates a mold risk distribution that reveals the probability of mold occurrence in selected trouble spots in a building. The approach has been tested on three building cases located in Miami and Atlanta. In all cases the new approach was able to show the circumstances under which the mold risk could increase substantially, leading to a set of clear specifications for remediation and, in for new designs, to A/E procurement methods that will significantly reduce any mold risk.
Maximizing the benefits of courtroom POEs in design decision support and academic inquiry through a unified conceptual model.

(Georgia Institute of Technology, 2005-02-10) Pati, Debajyoti

Post-occupancy evaluations represent an important missed opportunity. While POEs are often used to inform design guides, and to support facility management, they are seldom used to support design decision-making. While there are several technical, methodological, and cultural impediments to the ongoing use of POE results in design, characteristics of POE data and data structure is an important, and often overlooked, impediment. Some evaluators have attempted to resolve this problem by involving actively as consultants in design teams or involving users, such as Placemaking or Process Architecture. Recent advances in conceptual data modeling provide another strategy to interface POE findings and design decision-making. This thesis uses EXPRESS modeling language to develop a conceptual data structure for POE data, and integrate POE data with as-built building descriptions. While this effort has the potential to develop an improved way to structure POE data and make it more useful, it is also an extension of ISO-STEP. This study develops a data structure based on post-occupancy evaluations of state and federal trial courtrooms conducted by the researcher. Thirty-one courtrooms were evaluated, resulting in usable data from 93 courtroom users in 26 courtrooms. An EXPRESS-G schema was developed and was translated into a relational database for holding data and running queries. The investigator illustrated a range of query-generated outcomes to support decision-making during design and design review. Such outcomes include exploring existing courtrooms, comprehending the types of design decisions implemented across federal and state courtrooms, identifying design decisions that have been rated favorably or otherwise by courtroom users, rating design decisions based on evaluation data from existing courtrooms, and predicting a designed environments supportiveness to task performance. Further, multivariate analysis of the POE data provides the first scientific investigation of courtrooms as work settings. Finally, eight key performance indicators of courtrooms were developed based on the POE data.