Energy and Sustainability

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Browsing Energy and Sustainability by Type "Poster"

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    A numerical study of deep borehole heat exchangers in unconventional geothermal systems
    (Cranfield University, 2018-10-22 10:16) Renaud, Théo
    Poster presented at the Cranfield Doctoral Network Annual Event 2018.The geothermal energy sector is facing numerous challenges related to heat recovery efficiency and economic feasibility. Ongoing research on superheated/supercritical geothermal system, potentially representing a intensive amount of energy, is developed in Europe notably the Iceland Deep Drilling project (IDDP). The well IDDP-1, which reached a magma intrusion at a depth of 2100 m, raised new opportunities to untap the geothermal potential near shallow magmatic intrusions. Given their highly corrosive nature, geothermal fluids weaken the wellbore’s integrity during conventional geothermal production. Deep Borehole Heat Exchangers (DBHE) that do not require fluid exchange between the surface and the wells represent a strategic alternative to recovering heat from these unconventional geothermal resources, while minimising the risk of in-situ reservoir damage. The thermal influence and heat recovery associated with a hypothetical DBHE drilled into the IDDP geological settings were investigated via Computational Fluid Dynamics (CFD) techniques until 10 years of production, when the system reaches full equilibrium. Two wellbore designs were simulated, based on simplified geological properties from the IDDP-1 well description. The results show that, during the first year of production, the output temperature is function of the working fluid velocity before reaching pseudo-steady state behaviour. The cooling perturbation near the bottom hole is shown to grow radially from 10 to 40 m between 1 and 10 years of production, and the output thermal power calculated after 10 years reaches 1.2 MW for a single well.
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    Developments in CO2 Compression and Purification Unit (CPU) for Oxy-fuel Combustion Power Plant
    (Cranfield University, 2018-10-22 10:25) Yan Yan, Harry
    Poster presented at the Cranfield Doctoral Network Annual Event 2018.Developments in Carbon Dioxide Compression and Purication Unit (CPU) for Oxyfuel Combustion Power Plant. Oxyfuel combustion technology as one of three major carbon capture technologies, which has been largely investigated from bench scale to demonstration scale. The difference of carbon dioxide gas quality in oxyfuel combustion technology which require additional process with high cost and energy penalty than that of pre- and post-combustion capture technology. In this work, previous work from the oxyfuel combustion demonstration projects and industrial technologies of CPU led by Air Products, Air Liquide, Linde and Praxair have been reviewed. A novel concept that using wet ozone direct oxidation absorption for simultaneous removal SOx and NOx for CPU has been proposed and validated in Aspen Plus. The results indicated that 99% NO, 90% NO2 and nearly 100% of SO2 was removed at pH 11 before compression and the purity of product CO2 can achieve 99.7%. Comparison with the previous technologies, this method achieve high purity of product CO2 with simplified process and can realize the negative emission in oxyfuel combustion power plant.
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    Poster Presentations for UK Conference events 2022: Hydrogen homes and social acceptance in the United Kingdom
    (Cranfield University, 2022-10-28 16:42) Gordon, Joel; Ozkan, Nazmiye; ali Nabavi, Seyed
    These contributions represent findings from a series of online focus groups conducted with members of the UK public (n=58) between February and April, 2022. The study set out to better understand consumer attitudes towards the proposition of converting the national gas grid to enable a domestic hydrogen future; composed of hydrogen home appliances for space heating, hot water, and cooking. The posters show that that future heating systems should ensure thermal comfort, ease of use, energy efficiency, and smart performance, while providing space savings and noise reduction, alongside demonstrable environmental benefits. For cooking systems, consumers wish to preserve the best features of gas, such as speed, responsiveness, and controllability, but also desire the potential safety and aesthetic benefits of electric systems, principally induction hobs. For the most part, hydrogen heating and cooking appear welcome prospects for natural gas users, with no discernible preference for hobs over boilers, or vice-versa. Notwithstanding, careful attention is needed to understand the interplay between static and dynamic factors, such as personal values and beliefs, and changes in culture and energy markets. Furthermore, hydrogen policy should align to ensuring greater transparency concerning the benefits, costs, and risks of the transition. This involves clearer explanation regarding the justification and implications of hydrogen production pathways and emerging hydrogen geographies. The analysis concludes that consumer heterogeneity must be internalized into policymaking to enact socially acceptable transition pathways for the UK housing stock.