<p>Research on net-zero energy buildings (NZEBs) has been largely centered around improving building energy performance, while little attention has been given to indoor air quality. A critically important class of indoor air pollutants are nanoaerosols – airborne particulate matter smaller than 100 nm in size. Nanoaerosols penetrate deep into the human respiratory system and are associated with deleterious toxicological and human health outcomes. An important step towards improving indoor air quality in NZEBs is understanding how occupants, their activities, and building systems affect the emissions and fate of nanoaerosols. New developments in smart energy monitoring systems and smart thermostats offer a unique opportunity to track occupant activity patterns and the operational status of residential HVAC systems. In this study, we conducted a one-month field campaign in an occupied residential NZEB, the Purdue ReNEWW House, to explore how energy use profiles and smart thermostat data can be used to characterize indoor nanoaerosol dynamics. A Scanning Mobility Particle Sizer and Optical Particle Sizer were used to measure indoor aerosol concentrations and size distributions from 10 to 10,000 nm. AC current sensors were used to monitor electricity consumption of kitchen appliances (cooktop, oven, toaster, microwave, kitchen hood), the air handling unit (AHU), and the energy recovery ventilator (ERV). Two Ecobee smart thermostats informed the fractional amount of supply airflow directed to the basement and main floor. The nanoaerosol concentrations and energy use profiles were integrated with an aerosol physics-based material balance model to quantify nanoaerosol source and loss processes. Cooking activities were found to dominate the emissions of indoor nanoaerosols, often elevating indoor nanoaerosol concentrations beyond 10⁴ cm^-3. The emission rates for different cooking appliances varied from 10¹¹ h^-1 to 10¹⁴ h^-1. Loss rates were found to be significantly different between AHU/ERV off and on conditions, with median loss rates of 1.43 h^-1 to 3.68 h^-1, respectively. Probability density functions of the source and loss rates for different scenarios will be used in Monte Carlo simulations to predict indoor nanoaerosol concentrations in NZEBs using only energy consumption and smart thermostat data.</p>

Construction and operation of commercial and residential buildings in the United States have been identified as the single largest sector of energy consumption and contributor to greenhouse gas emissions. Subsequently, buildings must be a primary target for reductions. From short-term incentives, to long-term milestones, building energy efficiency, specifically net zero energy buildings, have emerged as a significant and unprecedented objective for a variety of public and private organizations in the United States. Altering the practices of the building culture requires not only technological innovation, but also an understanding of how practitioners within the building culture see their role in transforming it. Consequently my research seeks to understand how building industry professionals comprehend their capacity to influence the cultural boundaries of their profession in order to account for and mitigate the impacts of energy and emissions in the built environment. Ultimately, this study is an investigation into the social construction of technological change. The AIA+2030 Professional Series offered by the Denver Chapter of the American Institute of Architects has served as the single case study for this investigation. By limiting local conditions to the Denver-based Series and defining advocates as the self-selected group of participants, I’ve narrowed this analysis to reflect a workable microcosm of practitioners who are committed to the investigation and integration of net zero energy design, construction, and building operation practices. In order to substantiate this empirical analysis, I employed a triangulated series of data collection and interpretation consisting of: participant observation, interviews, and a survey. Data analysis involved an iterative process of coding and categorizing the primary key words and themes that emerged throughout my investigation. Each of the perspectives offered during this investigation indicate that architects who are advocates of net zero energy building design perceive that consequential opportunities for fundamental change exist within the social and cultural facets of the building culture. Ultimately, by preferencing social and cultural activism over technological manipulation, these advocates have corroborated the notion that technological change is fundamentally rooted in social change. / text

The vaccine cold chain is an integral part of the process of storing and distributing vaccines prior to administration. A key component of this cold chain for developing countries is the primary vaccine storage warehouse. As the starting point for the distribution of vaccines throughout the country, these buildings have a significant amount of refrigerated space and therefore consume large amounts of energy. Therefore, this thesis focuses on analyzing the relative importance of parameters for the design of an energy efficient primary vaccine storage warehouse with the end goal of achieving Net-Zero Energy operation. A total of 31 architectural design parameters, such as roof insulation U-Value and external wall thermal mass, along with 14 building control parameters, including evaporator coil defrost termination and thermostat set points, are examined. The analysis is conducted across five locations in the developing world with significant variations in climate conditions: Buenos Aires, Argentina; Tunis, Tunisia; Asuncion, Paraguay; Mombasa, Kenya; and Bangkok, Thailand. Variations in the parameters are examined through the implementation of a Monte Carlo-based global uncertainty and sensitivity analysis to a case study building layout. A regression-based sensitivity analysis is used to analyze both the main effects of each parameter as well as the interactions between parameter pairs. The results of this research indicate that for all climates examined, the building control parameters have a larger relative importance than the architectural design parameters in determining the warehouse energy consumption. This is due to the dominance of the most influential building control parameter examined, the Chilled Storage evaporator fan control strategy. The importance of building control parameters across all climates examined emphasizes the need for an integrated design method to ensure the delivery of an energy efficient primary vaccine warehouse.

As the third largest energy consumer, the residential sector in Canada is responsible for 17% of energy consumption and 15% of greenhouse gas emissions. With the increase in population, the number of new houses is expected to increase by 2.8 million from 2005 to 2020, and more energy is expected to be consumed despite the emergence of better insulated houses and more efficient heating methods. The primary objective of this study is to determine the prospects of reducing CO2 emissions from the residential sector in Waterloo Region by achieving a higher building standard, such as the Passivhaus (PH) and Net Zero Energy (NZE). The profile of the building envelope, including the initial CO2 emissions was compared against the requirements of the PH and NZE standards, using the Residential Energy Efficiency Project dataset (2007-2012). The second objective evaluates the barriers and drivers that influence the setting of higher building envelope standards. Ontario Building Codes (1975-2012) were analysed to determine the changes to insulation requirements over time, and Ontario Legislative Assembly debates (1970-2012) were reviewed to determine the barriers and drivers expressed in political debates. Content analysis was applied to the Legislative Assembly of Ontario’s documents to determine the frequency of nine word categories prior to each new building code. This study identified three main categories of drivers: awareness of environmental issues, resource limitation, and the implications of climate change; and three categories of barriers: financial, political and structural, and barriers related to information, promotion, and education. The findings of this study confirm that existing houses in Waterloo Region can achieve substantial reductions in CO2 emissions and energy usage by meeting higher building standards. Building code improvements have certainly played an important role in the evolution of Ontario houses, and the 2012 building code, achieves the R-2000 standard universally. More advanced standards show the potential for greater savings, but have only been adopted on a voluntary basis.

abstract: The building sector is one of the main energy consumers within the USA. Energy demand by this sector continues to increase because new buildings are being constructed faster than older ones are retired. Increase in energy demand, in addition to a number of other factors such as the finite nature of fossil fuels, population growth, building impact on global climate change, and energy insecurity and independence has led to the increase in awareness towards conservation through the design of energy efficient buildings. Net Zero Energy Building (NZEB), a highly efficient building that produces as much renewable energy as it consumes annually, provides an effective solution to this global concern. The intent of this thesis is to investigate the relationship of an important factor that has a direct impact on NZEB: Floor / Area Ratio (FAR). Investigating this relationship will help to answer a very important question in establishing NZEB in hot-arid climates such as Phoenix, Arizona. The question this thesis presents is: “How big can a building be and still be Net Zero?” When does this concept start to flip and buildings become unable to generate the required renewable energy to achieve energy balance? The investigation process starts with the analysis of a local NZEB, DPR Construction Office, to evaluate the potential increase in building footprint and FAR with respect to the current annual Energy Use Intensity (EUI). Through the detailed analysis of the local NZEB, in addition to the knowledge gained through research, this thesis will offer an FAR calculator tool that can be used by design teams to help assess the net zero potential of their project. The tool analyzes a number of elements within the project such as total building footprint, available surface area for photovoltaic (PV) installation, outdoor circulation and landscape area, parking area and potential parking spots, potential building area in regards to FAR, number of floors based on the building footprint, FAR, required area for photovoltaic installation, photovoltaic system size, and annual energy production, in addition to the maximum potential FAR their project can reach and still be Net Zero. / Dissertation/Thesis / FAR CALCULATOR TOOL / Masters Thesis Built Environment 2016

The intent of this study was to design produce a comprehensible but user-friendly method that would provide a step-by-step process and guide in originating sustainable, affordable and energy efficient net-zero residential housing. The right-step procedure of the VERSAE Method was linked to the traditional vernacular architecture of the Hopi, a Native American people who still reside on part of their aboriginal lands in northeastern Arizona. The process combined traditional strategies identified in local vernacular Hopi architecture with modern strategies to successfully design sustainable, affordable and energy efficient (net-zero) housing specifically for contemporary Hopi housing. The process was documented in the capstone project, "Housing for the Hopi Community: Designing Sustainable, Affordable and Energy Efficient Housing in the Hopi Community, Linking to Cultural Patterns of Sustainability". For this thesis, the VERSAE method and process was replicate to create a sustainable, affordable and net-zero housing prototype for the Omaha Nation located in Nebraska with significantly different climate, environment, local materials and cultural patterns. Both case studies validated the VERSAE method as conductive to sustainable, affordable and energy efficient (net-zero) housing design.

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The emissions of greenhouse gases need to be cut by 45% between 2010 and 2030 and reach net-zero by around 2050 (IPCC, 2018) to limit global temperature-rise to 1,5 degrees C. More companies are committing to net-zero emissions, but the overall emissions of greenhouse gases in the world are still going up, and previous research shows that there is an implementation gap and lack of plans in companies. This thesis examines the hindering and supporting factors for companies’ net-zero transition. It is also exploring how SBTi, sustainability reporting, and sustainability ratings influence the net-zero transition in companies according to sustainability practitioners. The key findings are that companies alone cannot do the net-zero transition; they are dependent on other stakeholders and factors such as investors, customers and suppliers. Investors and customers are strong drivers for some companies to make the transition to netzero, but they are also the strongest hindering factors not wanting to pay extra or sacrifice dividends for the transition in companies’ value chains. Companies are also dependent on their suppliers and customers to measure and cut their value chain scope 3 emissions. To reach net-zero, new ways of collaboration are needed across the value chain. Internally, the implementation has not started properly in many companies. The key hindering factor internally is money, the investments needed will impact the profits, and often bonuses of managers, and GHG emission reductions need to be valued on the same level as money. Investors and financial actors play a large role pushing companies to set net-zero targets through SBTi. SBTi is a key framework to make companies cut emissions in line with science, but its control mechanisms are weak. If the control mechanisms are strengthened through audits, accountability and litigation, SBTi has the potential to be a very strong supporting factor for companies’ net-zero transition. Sustainability reports and ratings are the way companies communicate their net-zero performance with their stakeholders, but the reports are a polished truth, and it is difficult to understand the net-zero performance in companies. Ratings such as CDP do not reward emission reductions enough, instead they reward processes and documents which can make the companies look greener than they are.

Thesis advisor: Sarah Babb / The years since the Paris Agreement have seen intensifying efforts to decarbonize the financial system. Disclosure frameworks, notably the Taskforce for Climate-related Financial Disclosure (TCFD), and Net-Zero targets, are fast becoming institutionalized globally to incentivize financial institutions to divert capital into low-carbon activities and away from carbon-heavy ones. I examine the implementation of these frameworks among financial corporations (FCs) in Singapore. 15 semi-structured interviews with professionals in the industry at the forefront of TCFD and Net-Zero suggest that FCs’ “talk” often does not match with their “actions”. Organizations ceremonially comply with new global standards as well as local regulations on TCFD and Net-Zero while they continue to finance carbon-intensive economic activities. Yet this apparent “hypocrisy” may not be so much a result of coordinated efforts for organizational buffering, as it is a consequence of disorganization and discoordination. Informants suggest that different parts within FCs independently perceived and responded differently, at a different pace, to the novel challenges that climate change has brought. I contribute to the environmental sociology literature on “organized hypocrisy” by examining how commonly perceived “hypocrisy” is or is not, in fact, “organized”. In doing so, I suggest that we should not assume “hypocrisy” to be an intentional organizational project. Furthermore, rather than seeing “hypocrisy” as effort to keep an organization “stable”, I argue that hypocrisy may be indicative of slow and potentially discordant organizational change, with ongoing internal efforts by insiders to match “actions” with “talk”. / Thesis (MA) — Boston College, 2023. / Submitted to: Boston College. Graduate School of Arts and Sciences. / Discipline: Sociology.

Individual and societal desires for fossiluel independence are an increasingly popular goal. This research investigates residential geothermal space heating and cooling as a viable technical and financial alternative. The road to net-zero energy is then assessed, weighing the benefits and detriments to the consumer. First, the template for location-specific geothermal space heating and cooling is developed through a pilot analysis of a home in Memphis, Tennessee. A methodical process of soil investigation, prototype home characteristics, and financial incentives is designed. Expanding upon existing studies, accurate soil data is extracted from beneath the foundation of a specific address, rather than region-wide soil averages. This high level of precision allows the owner of a specific address to preview realistic results and develop truthful expectations. Payback period and system lifetimes savings are calculated using two methods. Second, the framework developed through the Memphis, Tennessee pilot home is used to investigate 11 additional cities across the continental United States. The increase in breadth uses a representative city from its respective climate zone. While each city within a single climate zone will vary from the representative city, a general climate performance can be determined. With each location’s soil properties and heating and cooling demands, the borefield design and heat pump system capacity is customized and applied for analysis. Using human interest surveys from previous energy projects, a climate is ultimately classified as viable or nonviable for geothermal heating and cooling. Finally, the increasingly popular net-zero energy building concept is explored through a complementary solar photovoltaic (PV) array to the geothermal system. An array capacity is sized and priced to offset the total facility energy use in each climate’s representative city. Once determined, the payback and lifetime savings values are calculated and the GHP + PV system results are compared to a baseline + PV system. From this, a system type is identified as the more viable option for each of the 12 climate zones. The final touch on this research is the introduction of the human perceptions toward environmentally friendly renewable energy in general and how it affects a consumer’s ultimate decision.