Browsing NTNU Open by Author "Li, Haoran"
Now showing items 1-14 of 14
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Analysis of difference-frequency wave loads and quadratic transfer functions on a restrained semi-submersible floating wind turbine
Li, Haoran; Bachynski-Polic, Erin Elizabeth (Peer reviewed; Journal article, 2021)One of the concerns regarding numerical simulation of floating wind turbines (FWTs) in waves is underprediction of resonant responses in the low-frequency range. In the present work, the difference-frequency wave loads on ... -
Economic optimization for heat-prosumer- based district heating systems in unidirectional heating markets
Li, Haoran (Doctoral theses at NTNU;2022:18, Doctoral thesis, 2022) -
Energy, economic, and environmental analysis of integration of thermal energy storage into district heating systems using waste heat from data centres
Li, Haoran; Hou, Juan; Hong, Tianzhen; Ding, Yuemin; Nord, Natasa (Peer reviewed; Journal article, 2021)Data centres produce waste heat, which can be utilized in district heating systems. However, the mismatch between data centres’ heat supply and district heating systems’ heat demands limits its utilization. Further, high ... -
Experimental and numerical investigation of nonlinear diffraction wave loads on a semi-submersible wind turbine
Li, Haoran; Bachynski, Erin Elizabeth (Peer reviewed; Journal article, 2021)In a severe sea state, nonlinear wave loads can excite resonant responses of floating wind turbines either at high (structural) or low (rigid body motions) natural frequencies. In the present work, a computational fluid ... -
Experimental and numerically obtained low-frequency radiation characteristics of the OC5-DeepCwind semisubmersible
Li, Haoran; Bachynski-Polic, Erin Elizabeth (Peer reviewed; Journal article, 2021)Added mass and damping play a significant role in accurate prediction of floating wind turbine (FWT) motions, especially near the resonance frequencies. This paper investigates the still-water hydrodynamic characteristics ... -
Nonlinear Wave Loads, and Resulting Global Response Statistics of a Semi-Submersible Wind Turbine Platform with Heave Plates
Li, Haoran (Doctoral theses at NTNU;2021:278, Doctoral thesis, 2021)Floating wind turbines (FWTs) are considered to be a promising way to harness the energy from winds over deep water and farther offshore. However, there are some challenges to bring this technology to full maturity. In ... -
Numerical Simulation of Fully Nonlinear Interaction Between Regular and Irregular Waves and a 2D Floating Body
Li, Haoran; Bachynski, Erin Elizabeth (Chapter, 2019)A fully nonlinear Navier-Stokes/VOF numerical wave tank, developed within the open-source CFD toolbox OpenFOAM, is used to investigate the response of a moored 2D floating body to nonlinear wave loads. The waveDyMFoam ... -
OC6 Phase Ib: Validation of the CFD predictions of difference-frequency wave excitation on a FOWT semisubmersible
Lu, Wang; Robertson, Amy; Jonkman, Jason; Yu, Yi-Hsiang; Koop, Arjen; Nadal, Adrià Borràs; Li, Haoran; Bachynski-Polic, Erin Elizabeth; Pinguet, Romain; Shi, Wei; Zeng, Xinmeng; Zhou, Yang; Xiao, Qing; Kumar, Rupesh; Sarlak, Hamid; Ransley, Edward; Brown, Scott; Hann, Martyn; Netzband, Stefan; Wermbter, Malwin; López, Beatriz Méndez (Peer reviewed; Journal article, 2021)During the previous OC511 project, state-of-the-art mid-fidelity engineering tools for floating wind systems were found to consistently underpredict the nonlinear, low-frequency responses of semisubmersible offshore wind ... -
Operation strategies to achieve low supply and return temperature in district heating system
Li, Haoran; Nord, Natasa (Journal article; Peer reviewed, 2019)English -
Optimal control of secondary side supply water temperature for substation in district heating systems
Hou, Juan; Li, Haoran; Nord, Natasa (Journal article; Peer reviewed, 2019)Low temperature is the most significant feature of the future district heating system- the 4th generation district heating (4GDH). However, a widely used control strategy for supply water temperature in substation is ... -
Optimize heat prosumers' economic performance under current heating price models by using water tank thermal energy storage
Li, Haoran; Hou, Juan; Tian, Zhiyong; Hong, Tianzhen; Nord, Natasa; Rohde, Daniel (Peer reviewed; Journal article, 2021)Due to heat prosumers' dual roles of heat producer and heat consumer, the future district heating (DH) systems will become more flexible and competitive. However, the current heating price models have not yet supported the ... -
Techno-economic analysis of implementing thermal storage for peak load shaving in a campus district heating system with waste heat from the data centre
Li, Haoran; Hou, Juan; Ding, Yuemin; Nord, Natasa (Peer reviewed; Journal article, 2021)Peak load has significant impacts on the economic and environmental performance of district heating systems. Future sustainable district heating systems will integrate thermal storages and renewables to shave their peak ... -
Transition to the 4th generation district heating-possibilities, bottlenecks, and challenges
Li, Haoran; Nord, Natasa (Journal article; Peer reviewed, 2018)The 4th generation district heating (DH) will be available in the coming years. However, the transition from the current 2nd or 3rd generation DH is a challenging task. This article reviewed the technical issues associated ... -
Validation and application of nonlinear hydrodynamics from CFD in an engineering model of a semi-submersible floating wind turbine
Li, Haoran; Bachynski-Polic, Erin Elizabeth (Peer reviewed; Journal article, 2021)Nonlinear hydrodynamics play a significant role in accurate prediction of the dynamic responses of floating wind turbines (FWTs), especially near the resonance frequencies. This study investigates the use of computational ...