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Research Commons is the University of Waikato's open access research repository, housing research publications and theses produced by the University's staff and students.
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Publication Multi-Level process integration of heat pumps in a non-continuous processing site(Thesis, The University of Waikato, 2024)Industrial process heat demands contribute significantly to New Zealand’s greenhouse gas emissions. With a global push towards decarbonization, including New Zealand’s Climate Change Response Amendment Act 2019, there is a need for methods and technologies that can be applied to replace industrial fossil fuel boiler use. With an increasing range of renewable energy sources, electrification provides a promising alternative to fossil fuel use; however, it is also critical to reduce process heat demands where possible. This can be done through the reuse of industrial waste heat via direct heat exchange, thermal storage, or heat pump installations. Existing Heat Integration methods provide a means of identifying waste heat recovery opportunities; however, these methods are typically aimed at steady state industries. In New Zealand, many industries operate in a non-continuous manner, creating challenges in the accurate application of these existing Heat Integration methods. This thesis presents a multi-level process integration method for heat pump and thermal storage retrofit on non-continuous industrial processing sites. This method aims to address several gaps in current Heat Integration methodology through the novel amalgamation of several tools discussed in four main chapters: (1) A multi-level heat pump integration tool is developed that sequentially identifies heat pump opportunities to both upgrade waste heat for reuse, and shift remaining waste process heat towards more favorable temperature ranges, (2) A multi steady state time slice investigation develops a tool for selecting appropriate time slice sizes to accurately represent variable, non-continuous industrial sites, (3) a multi steady state thermal storage identification tool is developed by applying the previously identified time slices to existing heat integration methods with an aim to further buffer fluctuations in heat demand, and optimize the thermal loads on the previously identified heat pump opportunities. The tools are combined into a final method and applied to a meat processing case study site that is representative of the variable, non-continuous industries that dominate the food sector in New Zealand. In this case study, hourly time slices were used to identify multiple successive heat pump opportunities including a 1.9 MW MVR that recompresses waste steam from the rendering dryers with a COP of 10, and a central 1.5 MW heat pump that supplies heat at 70°C to the site ring main with a COP of 3.4. In addition, it was found that the 90°C heat pump, already installed on the case study site, would have the potential to increase utilization on the case study site if the two other heat pump opportunities identified were implemented. Thermal storage opportunities were also identified that can be used to buffer heat demands on the 70°C heat pump opportunity, thereby allowing the heat pump to be resized to 1.04 MW in comparison to the initially hypothesized 1.5 MW, reducing both capital and operational costs of the heat pump. This amalgamated method provides novel Total Site Heat Integration additions, which when compared to conventional heat integration methods, provide more accurate and more useful heat pump decarbonization strategies for non-continuous industrial sites, ultimately aiding in industrial decarbonization.Item The experience of homemaking in unaffordable and precarious housing(Internet Publication, Building Better, Homes, Towns and Cities, 2024)Housing is the platform on which people build their lives. The experience of homemaking in unaffordable and precarious housing (Barrett, P., Cram, F. & James, B, 2024) is a new monograph from the Affordable Housing for Generations programme. Across 110 pages, 10 housing researchers share experiences from different groups of people in Aotearoa, burdened by the insecurity of unaffordable housing. The findings show how institutional, social and market dynamics impacting on life circumstances can cause people to be in precarious housing situations. Yet people continue to love homemaking and being contributors to their communities. Reinforcing the pivotal nature of housing in supporting all peoples’ health and wellbeing, this research demonstrates how much more can be achieved through improving access to stable, affordable housing and by understanding what is at the heart of a home.Publication Distributed agent-centric system for indigenous data sovereignty(Thesis, The University of Waikato, 2024)The sovereignty of indigenous data is a key issue facing indigenous communities. Holochain, a distributed ledger technology, has the potential to address some of the challenges indigenous communities face with respect to data sovereignty. The purpose of this thesis is to critically evaluate the feasibility of using holochain technology to support indigenous data sovereignty. This paper first explores the literature on holochain technology, examining its underlying architecture and features. The research employs a three-phase design science research methodology, conducting an experiment to explore the integration of a decentralized application, holochain, with a prominent cloud service provider. The first phase concentrates on emulating real data-sharing platforms that may utilize data at its disposal, following the principles of indigenous data sovereignty, where a centralized platform could be hosted on a cloud computing service with multiple services in operation. The second phase involves developing a holochain application guided by the principles of indigenous data sovereignty. The final phase seeks to combine the established centralized platform from the first phase with the outcomes of the holochain application from the second phase to experimentally assess whether both technologies can create a data sovereignty solution that aligns with the needs of indigenous data sovereignty. The results of the experiment will provide a solid foundation for understanding the current state of the field and identifying areas where holochain can potentially offer solutions. Furthermore, the results of our research indicate that holochain shows significant promise in tackling the issue of indigenous data sovereignty, although there are considerable limitations that must be addressed and resolved to achieve improved results.Item 2024 Moana Oceania soil judging competition handbook(Conference Contribution, New Zealand Society of Soil Science, 2024)Welcome to the 2024 Moana Oceania Soil Judging Competition, jointly hosted by the New Zealand Society of Soil Science (NZSSS) and Soil Science Australia (SSA) and held this year in the stunning volcanic landscape of Rotorua, New Zealand. This prestigious competition has become a much-anticipated event on both of our Societies’ calendars. This year's event provides an unparalleled opportunity to learn alongside participants from various soil-related backgrounds, including university students, regional council scientists, land managers, consultants, and general soil enthusiasts. Participants have travelled from every Australian state, across New Zealand and from a number of Pacific Island nations. Soil judging is one of the best possible training grounds for aspiring soil professionals and those working professionals who wish to add a string to their bow of skills. Whether you have an interest in research, teaching, or consultancy, within academia, government or the private sector, there is no shortage of career possibilities in soils. Students are our next generation of soil scientists and land managers and for that reason you play a critical role in both the NZSSS and SSA. Both nationally, and through our branches, our societies support students through a range of initiatives: • Travel grants to attend the biennial national soil science conference. • Financial support to attend the national soil judging competition and for the absolute best competitors, to attend the World Congress of Soil Science. • Awards, presented at national conferences and by our branches. • Reduced membership fees for our societies and registration fees for events. • Great opportunities for mentoring and networking. Over 3 days, we aim to equip participants with the soil description and classification skills that are vital for interpreting the best management and land use for any given soils. The practice and competition days will be intense, as your problem-solving skills, academic credentials and practical experience will be put to the test. This is your opportunity to show how much you have learned about soil description and classification and how you apply that knowledge in the field, often under pressure. Make the most of the training sessions, in the lead up to the competition day, and the chance to learn from some of our finest soil scientists as well as your fellow entrants. Remember, beyond the technical challenges, you will also discover the value of ongoing education and professional development and the satisfaction that comes from strong teamwork. Most importantly, we hope this experience reinforces your commitment to sustainable land management and to protecting one of our nation’s most precious natural assets - our soil.Publication He whiringa aroha: A mokopuna and a pare in the peabody essex museum(Thesis, The University of Waikato, 2024)Taonga, Māori ancestral treasures, embody the mana and knowledge of Māori ancestors. He Whiringa Aroha is one such treasure: a carved pare that affirms the mana of wāhine in the colonial archives, but whose whakapapa has been obscured. This thesis uses the name ‘He Whiringa Aroha’ and the te reo Māori pronoun ‘ia’ to refer to ‘E5501’, which is located in the 1806 Richardson collection in the Peabody Essex Museum. As He Whiringa Aroha travelled from Aotearoa New Zealand to Massachusetts, United States, ia became entangled in historical narratives that disembodied the taonga from hapū and iwi Māori. Taonga were not only physically removed from Aotearoa, but taonga and Māori creative practices were named, gendered, and displayed by colonisers. American sailors collected and displayed He Whiringa Aroha as an exotic ‘curiosity’ to showcase their triumph over Pacific waters. Yet, He Whiringa Aroha is a power portal—a potent braid to the past, the future, and to those Māori ways of being that defy the limiting archival language of colonialism. How do we relate to taonga Māori that have been fragmented by the colonial archive? What are alternatives to restory and reclaim taonga that remain in overseas museums? Using a creative methodology grounded in Mana Wahine and pūrākau, this thesis weaves a whiri (braid) of aroha (reverence) that attempts to restore he hononga mokopuna–the connection between taonga and their descendants. Through poetry, a decolonial map, interviews with ringatoi (Māori creatives), and archival research, I explore how the histories of taonga can be reclaimed in Māori worldviews. Interviews with pūkenga and tohunga toi reveal Māori understandings of taonga as expressions of toi, defying western taxonomies of ‘art’ and ‘curio’. Furthermore, archival research into the East India Marine Society and Peabody Essex Museum unmasks the American sailors and their provenance practices that have marginalised Māori, and in particular, wāhine Māori. Finally, I use pūrākau of atua wāhine, Mana Wahine and takatāpui scholarship to restory and rename He Whiringa Aroha. This archival storytelling raises new ethical questions about ownership and kaitiakitanga (guardianship), which pose interventions for existing conversations about the place of taonga Māori in overseas museum collections. Reclaiming the histories of ancestors in museums is more than decolonizing colonial archives; on the contrary, restorying taonga is an act of Indigenous resurgence. This Masters research opens new possibilities to reclaiming takatāpui narratives and the mana of wahine in museum archives.
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