Full metadata record
| DC Field | Value | Language |
|---|---|---|
| dc.contributor | Department of Building Environment and Energy Engineering | en_US |
| dc.contributor.advisor | Cao, Sunliang (BEEE) | en_US |
| dc.contributor.advisor | Yang, Hongxing (BEEE) | en_US |
| dc.creator | Zhou, Shijie | - |
| dc.identifier.uri | https://theses.lib.polyu.edu.hk/handle/200/13728 | - |
| dc.language | English | en_US |
| dc.publisher | Hong Kong Polytechnic University | en_US |
| dc.rights | All rights reserved | en_US |
| dc.title | Insights of energy flexibility and viability enhancement for ocean energy supported coastal commercial buildings with intelligent controls in responding to dynamic business models and grid incentives | en_US |
| dcterms.abstract | Currently, buildings and transportation contribute significantly to global energy consumption, while fossil fuels are still the mainstay of electricity production and may have adverse environmental consequences. Responding to these pressing concerns, the concepts of carbon neutrality, renewable energy utilization and zero-energy buildings have gained popularity. However, several challenges still need further investigation, including feasibility, discrepancy between generation and energy consumption and dependence on feed-in tariffs. Therefore, comprehensive research is needed to study coastal buildings by accomplishing the goal of a zero-energy building using a mixture of ocean energy resources while considering the design of different energy management schemes. The practicability of achieving zero-energy buildings using hybrid ocean energy systems was evaluated. To enhance energy flexibility and implement demand response control, the study explores the use of batteries for energy shifting, reducing peak demand and improving economic performance. Expanding the scale and number of the studied buildings, the research considers massive zero-energy ferry terminal buildings in two cities to establish a cross-harbour system. Attempts are made to contribute to performance enhancement by reaching cross-harbour energy sharing through self-built submarine cables, where relevant commercial policies are also examined to support the zero-energy buildings. Finally, electric ferries and electric cars with transport tasks are transformed into mobile energy storage devices with vehicle-to-building functionality to be able to take part in the energy-sharing responsibilities. Results showed that a sea-source cooling system could achieve high efficiency as well as reduce the energy demand, and a hybrid floating PV and tidal stream generator was feasible to meet the zero-emission building, with matching indicators between 0.4 and 0.7. This zero-emission system could achieve a positive relative net present value, and the high share of the tidal stream generator system reduced the economic performance. Batteries could enhance energy-matching performance, but their inclusion harmed economic and environmental performance. Energy flexibility control of peak shaving and valley filling could be effectively implemented through batteries, and demand charge could be effectively reduced during the peak period. Meanwhile, the energy flexibility-based strategy responded perfectly to the programme's events and obtained incentives, resulting in a remarkable economic enhancement. However, such an enhancement still made it difficult to increase the renewable energy penetration to 30% without relying on feed-in tariff subsidies. Having looked further at a cross-harbour system, in the scenario of two separate systems in the respective region, the capacity of submarine cables could be less than the maximum capacity only if a floating PV system constructed offshore was present. Although the batteries instituted offshore could substitute a partial submarine cable capacity to reduce the dumped energy, the economic performance was compromised. In a scenario where submarine cables connect all sites, the energy-sharing strategy enabled 40% of the maximum submarine cable capacity without the dumped energy, while energy matching and economic performance were significantly improved. Energy sharing in the integrated feed-in tariff policy was more enhanced for economic performance in source-based compared to boundary-based. Electric ferries and electric vehicles incorporating the vehicle-to-building feature were able to enhance energy sharing further. However, the enhancement was not significant. | en_US |
| dcterms.extent | 105 pages : color illustrations | en_US |
| dcterms.isPartOf | PolyU Electronic Theses | en_US |
| dcterms.issued | 2025 | en_US |
| dcterms.educationalLevel | Ph.D. | en_US |
| dcterms.educationalLevel | All Doctorate | en_US |
| dcterms.LCSH | Ocean energy resources | en_US |
| dcterms.LCSH | Renewable energy sources | en_US |
| dcterms.LCSH | Zero energy buildings | en_US |
| dcterms.LCSH | Hong Kong Polytechnic University -- Dissertations | en_US |
| dcterms.accessRights | open access | en_US |
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