Browsing by Author "Nabavi, Ali"
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Item Open Access The effect of hydrogen fuel on the performance and emissions of 3 kWe natural gas fuelled microturbine(Elsevier BV, 2024-11-15) Jomekian, Abolfazl; Alhasnawi, Bilal Naji; Bazooyar, Bahamin; Nabavi, Ali; Varasteh, HirbodHydrogen is an alternative fuel to power microturbines. In this work, the application of H2 in a 3 kWe microturbine combustor is investigated. First, the combustor is tested with different molar concentrations of hydrogen in methane fuel (XH2= 5%, 10% and 20%). Afterward, the operation of the microturbine is verified using thermodynamic analysis of the microturbine cycle. The combustion of the fuels is investigated using CFD analysis. The level of gaseous emissions including (CO2, CO, and NOX) and the microturbine overall operability in terms of turbomachine mechanical and thermal efficiencies are compared in each case to find out the influence of hydrogen addition on the natural gas combustion in the microturbine (MT). Findings show that the application of hydrogen in the MT combustor decreases the level of CO2 and CO emissions while increasing NOX emissions. Despite the improvement in combustion, hydrogen could deteriorate the MT effectiveness and overall efficiency. The findings demonstrate that if the hydrogen mole percent in the fuel rises from 0 to 10, the cycle efficiency decreases from 4.73% to 4.7% and if it increases to 20 percent, the efficiency of the cycle increases from 4.7% to 4.92%.Item Embargo Towards a unified theory of domestic hydrogen acceptance: a mixed-methods multigroup analysis.(Cranfield University, 2023-10) Gordon, Joel Adam; Ozkan, Nazmiye; Nabavi, AliThe historical record reflects the need to understand the dynamics of social acceptance in advance of technology deployment to minimise the risk of non-adoption or slow diffusion. In the emerging context of hydrogen energy technologies, research on social acceptance has ebbed and flowed, reflecting various hype cycles associated with the hydrogen economy. Following primary interest in public perceptions of hydrogen for transport applications, a social science research agenda on hydrogen energy technologies for domestic space and hot water heating, and cooking has recently emerged. Research uptake follows growing policy interest in converting the national gas grid to hydrogen in countries such as the United Kingdom. The question remains, how do existing gas users in the United Kingdom perceive the prospect of switching to a hydrogen home? In response, this thesis advances a unified theory and establishes a comprehensive typology of domestic hydrogen acceptance, which embed multiple dimensions such as knowledge and awareness, environmental attitude, and financial perceptions. Partial least squares structural equation modelling is employed to determine the antecedents of domestic hydrogen acceptance and adoption intention, which include perceived community benefits, perceptions of hydrogen production pathways, public trust, and positive emotions. Subsequently, partial least squares multigroup analysis is applied to explore the potential for divergent consumer perceptions and preferences. Notably, the statistical findings suggest technology perceptions is the main determinant of adoption potential among consumers who are non-engaged in technology and the environment. By contrast, production perceptions and safety perceptions hold the strongest influence among consumers who are at least moderately engaged in technology and the environment. This thesis enriches conceptual and empirical understanding on the dynamics of domestic hydrogen acceptance and adoption in support of securing a socially acceptable transition pathway for residential decarbonisation. Foremost, segment- specific strategies should be embedded into national and regional policy making on the domestic hydrogen transition to steer progress towards realising a net-zero society.