Electrical Power Output Research Articles

Heat and mass transfer performance of ferricyanide/ferrocyanide thermocell and optimization analysis

Thermocell, as a device of thermoelectric conversion, can directly convert waste heat into electricity without moving parts and gas emissions. The overall numerical thermocell model is an effective tool used to study different processes and phenomena of heat and mass transfer. In this study, the mathematical model of Fe(CN)63−/4- thermocell was established and numerically analyzed. The influence of cell's size, temperature difference, electrolyte concentration, and electrode structure on the output power and efficiency of thermocell were studied under the multiple physical fields of temperature, velocity, concentration, and electrochemical reaction. The results revealed that higher cell's height, shorter cell's length, and higher concentrations tend to maximize electrical output power. At the cell's height of 10 mm, cell's length of 2 mm, the temperatures of the hot side and cold side of 310.55 K and 290.55 K respectively, and initial concentrations of ferrocyanide and ferricyanide of 400 moL/m³, yielded the maximum value of electrical output power of 6.75 μW. This research demonstrated that improving the performance of the thermocell depended not only on electrochemistry and materials, but also on design optimization. Combining the influence of temperature difference and electrolyte concentration, the optimization strategy including the size, temperature, concentration, and structure of thermocell was further proposed. The established thermocell model and the proposed optimization strategy can provide guidance for the designing of thermocells having higher output and conversion efficiency in the future.

A piezoelectric tuned mass damper for simultaneous vibration control and energy harvesting

This work proposes a novel piezoelectric tuned mass damper (PE-TMD) with dual function of energy harvesting and vibration control. The dual function is achieved by introducing several piezoelectric transducers into the conventional TMD. Unlike the conventional TMDs, the stiffness and damping of the PE-TMD can be adjusted by changing the circuit resistance. Moreover, the vibration energy absorbed from the primary structure, which is dissipated by the conventional TMD in the form of thermal energy, can be efficiently converted into electrical energy by the piezoelectric transducers for reuse. A railway bridge is selected as the research object to investigate the performance of the PE-TMD. The electromechanical coupling equations between the bridge and the PE-TMD are given first and then verified by a scaled model experiment. The results show the feasibility of the PE-TMD to achieve the two functions of vibration control and energy harvesting simultaneously. Subsequently, the parameters optimized results show that when the damper is completely replaced by the piezoelectric transducers, the two functions can be optimized simultaneously. The expressions for the optimal parameters to optimize the two functions are derived separately, and they are consistent. Finally, the performance comparison with the optimal conventional TMD shows that the optimal PE-TMD exhibits a slightly better performance in vibration control, and its output electrical power is almost identical to the dissipated power by the conventional TMD.

Green vs fossil-based energy vectors: A comparative techno-economic analysis of green ammonia and LNG value chains

This study conducts a comparative techno-economic assessment on the value chains of ammonia, as a green energy vector, and Liquefied Natural Gas (LNG), representing the benchmark energy vector, for long-distance energy transportation from Middle East to Europe. The value chain involves production from resources, conversion to an energy vector, storage and transport and reconversion of the energy vector to a suitable fuel. For comparison purposes, an electric power output of 400 MW is assumed to be produced by a power plant that utilizes either green or fossil fuels delivered to it. The adopted parameter for this comparison is the Levelized Cost of Energy (LCoE). Greenhouse gas emissions are economically penalized through the Social Cost of Carbon (SCC). Considering a SCC of 0.100 €/kg, the LCoE of the LNG value chain is 59.19 €/MWh, while that of ammonia is 231.71 €/MWh. Since the cost of producing green hydrogen and purified natural gas strongly affects the results, a sensitivity analysis is performed to assess the impact of the assumed values. The SCC required to break even the LCoE of the two value chains is: 0.183 €/MWh when considering the most favorable scenario for the green energy vector (low green hydrogen and high purified natural gas production costs) and 1.731 €/kg when considering the most unfavorable one. This study highlights the cost-effectiveness of LNG in the current economic and regulatory landscape. However, the break-even range for the SCC indicates the potential for green ammonia to gain economic viability under higher carbon pricing scenarios.

Performance of high-concentration photovoltaic cells cooled by a hybrid microchannel heat sink

The electrical performance and equipment lifetime of high-concentration photovoltaic cells depends heavily on efficient cooling. In this paper, we applied a hybrid configuration to the cooling of a high-concentration photovoltaic cell, an innovative pattern derived from a comprehensive study on the combination of oblique microchannel and micro pin fin. Results from this study found that an elliptical pin fin pattern conforming with streamlines most effectively removed heat flux with a Nusselt number of 65.44 at a Reynolds number 1250. Then, the performance evaluation of a photovoltaic cell with a concentration ratio of 1000 was carried out on the hottest day of each season in Shiraz under actual boundary conditions. With an average flow rate of 30 ml/min in the spring, the implementation of this hybrid design resulted in the photovoltaic cell achieving an electrical efficiency of 40.16 while still maintaining a constant surface temperature of 301 K. Unlike a straight microchannel, which failed to maintain a constant cell temperature throughout summer’s hottest hours, this hybrid configuration succeeded in sustaining cooling with an average flow rate of 90 ml/min. In the winter and autumn, the pump’s average power consumption required for cooling was about 25 and 38 mW, respectively. Moreover, the maximum output electrical power in the summer was 2.8 W, with pumping power contributing to 1500 mW.

Screening and optimization of metal-insulator-metal selective emitter in thermophotovoltaic system

In thermophotovoltaic (TPV) systems, it is crucial that the selective emitters can tailor emission spectrum to match the bandgap of photovoltaic (PV) cells and largely enhance the system efficiency. In this work, a metamaterial emitter based on the metal-insulator-metal (MIM) structure is proposed to obtain the high energy conversion efficiencies. The geometric parameters of MIM emitter have been investigated to obtain an excellent radiation spectrum of emitter composed of W and HfO2. The excellent emission performance of MIM emitter is attributed to the excitation of surface plasmon polariton (SPP) and cavity resonance, and the structure of MIM emitter is insensitive for different polarization modes. The 21 material combinations of MIM emitters have been screened to obtain the optimal emitter matching GaSb and InGaAsSb cells. This work identifies the crucial role of structure and materials into the emitter of a TPV system. In the evaluation of MIM emitter and TPV System, when the operating temperature of emitter increases from 1400[Formula: see text]K to 2000[Formula: see text]K, the system efficiency of optimal W/HfO2/W MIM emitter increases from 20.26% to 30.41%, while the output electric power increases from 3.59[Formula: see text]kW/m2 to 42.48[Formula: see text]kW/m2. The phenomenon indicates that the MIM emitter with the optimal material combinations and geometric parameters can significantly improve the matching degree with GaSb and InGaAsSb cells. Our results will be helpful to expand the optimization scope of metamaterial emitters in TPV systems.

High Thermoelectric Power Factors in Plastic/Ductile Bulk SnSe2 -Based Crystals.

The recently discovered plastic/ductile inorganic thermoelectric (TE) materials open a new avenue for the fabrication of high-efficiently flexible TE devices, which can utilize the small temperature difference between human body and environment to generate electricity. However, the maximum power factor (PF) of current plastic/ductile TE materials is usually around or less than 10 µW cm-1 K-2 , much lower than the classic brittle TE materials. In this work, a record-high PF of 18.0 µW cm-1 K-2 at 375 K in plastic/ductile bulk SnSe2 -based crystals is reported, superior to all the plastic inorganic TE materials and flexible organic TE materials reported before. The origin of such high PF is from the modulation of material's stacking forms and polymorph crystal structures via simultaneously doping Cl/Br at Se-site and intercalating Cu inside the van der Waals gap, leading to the significantly enhanced carrier concentrations and mobilities. An in-plane fully flexible TE device made of the plastic/ductile SnSe2 -based crystals is successfully developed to show a record-high normalized maximum power density to 0.18W m-1 under a temperature difference of 30 K. This work indicates that the plastic/ductile material can realize high TE power factor to achieve large output electric power density in flexible TE technology.

ТАЛШЫҚТЫ-ОПТИКАЛЫҚ БАЙЛАНЫС ЖОЛДАРЫ НЕГІЗІНДЕ ЭНЕРГИЯ ТАРАТУ ЖҮЙЕСІНІҢ ЗЕРТХАНАЛЫҚ ҮЛГІСІН ӘЗІРЛЕУ ЖӘНЕ ЗЕРТТЕУ

In this article, a laboratory sample of an energy transmission system over a fiber-optic communication line is being developed and investigated, which makes it possible to provide power to autonomous ultra-low-power electronic devices located at a considerable distance from energy sources. The system being developed will make it possible to abandon the use of copper conductors and batteries for autonomous stationary devices, which is associated with certain difficulties from the point of view of technical implementation. The result of this study is a developed laboratory sample that allows measuring the values of current and voltage in the branch of the photodetector. The method of an equivalent generator was used, as well as the well-known laws of a circuit with two dedicated nodes for an active two- pole. When analyzing the literature, scientific achievements and discoveries in the field of research, a proprietary research concept was formulated that differs from foreign analogues. During the experiment, the photodetector was in idle, short-circuit mode and was connected to a high-resistance load. Based on experimental data, volt-ampere characteristics (VAC) were constructed using a radiation source (laser) with a power of 10 and 30 MW. The technical parameters and characteristics of the radiation source and the irradiated silicon crystal are given. The output electrical power is determined using the laws of electrical engineering, including Ohm's law. To process the results obtained, quadratic interpolation of the function, the results of the root-mean-square approximation were used, and regression analysis was also performed. Absolute and relative errors were calculated. The student's coefficient was determined with a confidence interval of 0.95. According to the results of the study, the efficiency of a laboratory sample of an energy transmission system over a fiber-optic communication line was determined.

Experimental investigation on the performance of a micro-ORC system for different operating conditions

The micro-ORC systems are widely considered a reliable solution for domestic power production from renewable sources. The investigation of the optimal operating conditions to maximize system efficiency is an interesting challenge. In this study, a preliminary experimental campaign has been carried out on a biomass-fired micro-ORC system. The system is designed for stationary applications for domestic users, with a gear pump, a scroll expander and R245fa as the working fluid. The performance characterization of the micro-ORC under steady-state conditions has been obtained varying the water flow rate in the condenser at constant pump and expander speeds. The temperature of the hot source (thermal oil) is the maximum achievable in each operating condition. The temperature at the expander inlet and the condenser and evaporator pressure strongly influence the system performance. The increase in water flow leads to a decrease in the condenser pressure and a reduction of the superheating degree of the organic fluid. The system reaches the maximum electric power output of approximately 2565 W with a water flow rate of about 20 l/min. The highest electrical efficiency increases as the refrigerant flow rate decreases and reaches the highest value of 8.1% for the minimum investigated water flow rate.

The Performance of a Photovoltaic Cell Coupled with a Thermoelectric Generator

Abstract Identifying possibilities to increase the performance of photovoltaic cells is a priority for the energy field. This article presents preliminary results obtained in natural environment conditions with an experimental device that allows the cooling of photovoltaic cells and additionally the partial transformation of the heat transferred to the cold source (natural flowing water) by coupling with a thermoelectric generator based on the Seebeck effect. The structure of the experimental device is a sandwich type with the following main elements: the polycrystalline silicon photovoltaic cell, the Bi-Te thermoelectric generator and an aluminum radiator in contact with the cold water of the river. In this way, an increase in the electrical output power of approximately 28% is obtained, compared to the same photovoltaic cell alone.

Development and full system testing of novel co‐impregnated La0.20Sr0.25Ca0.45TiO3 anodes for commercial combined heat and power units

AbstractOver the past decade, the University of St Andrews and HEXIS AG have engaged in a highly successful collaborative project aiming to develop and upscale La0.20Sr0.25Ca0.45TiO3 (LSCTA‐) anode “backbone” microstructures, impregnated with Ce0.80Gd0.20O1.90 (CG20) and metallic electrocatalysts, providing direct benefits in terms of performance and stability over the current state‐of‐the‐art (SoA) Ni‐based cermet solid oxide fuel cell (SOFC) anodes.Here, we present a brief overview of previous work performed in this research project, including short‐term, durability, and poison testing of small‐scale (1 cm2 area) SOFCs and upscaling to full‐sized HEXIS SOFCs (100 cm2 area) in short stacks. Subsequently, recent results from short stack testing of SOFCs containing LSCTA‐ anodes with a variety of metallic catalyst components (Fe, Mn, Ni, Pd, Pt, Rh, or Ru) will be presented, indicating that only SOFCs containing the Rh catalyst provide comparable degradation rates to the SoA Ni/cerium gadolinium oxide anode, as well as tolerance to harsh overload conditions (which is not exhibited by SoA anodes). Finally, results from full system testing (60 cells within a 1.5 kW electrical power output HEXIS Leonardo FC40A micro‐combined heat and power unit), will be outlined, demonstrating the robust and durable nature of these novel oxide electrodes, in addition to their potential for commercialization.

Investigation of Hydrokinetic Tidal Energy Harvesting Using a Mangrove-Inspired Device

There is a trend towards harvesting tidal energy in shallow water. This study examined how tidal energy can be harvested using a device of oscillating cylinders inspired by the roots of mangroves. A specific focus was placed on optimising the configuration of these devices, informed by the computational fluid dynamics (CFD) analysis of wake interference in the von Kármán vortex street of the cylinders. A maximum efficiency of 13.54% was achieved at a peak voltage of 16 mV, corresponding to an electrical power output of 0.0199 mW (13.5% of the hydrokinetic energy of the water) and a power density of 7.2 mW/m2 for a flow velocity of 0.04 m/s (Re=239). The configuration of upstream cylinders proved to have a significant impact on the power generation capacity, corroborated further in CFD simulations. The effect of wake interference was non-trivial on the magnitude and quality of power, with tandem arrangements showing the largest impact followed by staggered arrangements. Though with comparatively low energy densities, the device’s efficiencies found in this study indicate a great potential to harvest tidal energy in shallow water, which provides a consistent baseload power to supplement intermittent renewables (e.g., solar and wind).

Development of a compact high-performance combustion powered thermoelectric generator based on swirl burner

Nowadays, with the emergence of high-performance thermoelectric (TE) modules and the continuous optimization of generator structures, hydrocarbon combustion powered mini-/meso-/micro-scale thermoelectric generator (HCP-m-TEG) has shown an energy density not second to that of lithium batteries. This means that HCP-m-TEG now has potential value in some specific commercial fields. However, the single-digit electric power output and over-miniaturized structure of most existing HCP-m-TEGs result in narrow application scenarios. To obtain higher energy density and electric power output, this study constructs a novel compact high-performance HCP-m-TEG prototype based on swirl burner. The total volume and weight of the HCP-m-TEG prototype are only 863.65 cm3 and 2.470 kg. The experimental results show that under extreme, safe, and long-term operating conditions, the electrical power and overall efficiency of the prototype reach 76.93 W-3.81 %, 69.58 W-3.73 %, and 56.21 W-3.29 %, respectively. Compared to previous work, this prototype has achieved excellent energy density. Moreover, the emission, modularity and the practical plans of the prototype are fully discussed. The emission of this prototype is comparable to residential stoves, which ensure safety. By combining different numbers of generation units, several potential application modes can be developed. Overall, this prototype provides a high energy density HCP-m-TEG structure with broad commercial potential.

Experimental study on a concentrating solar photovoltaic/thermal system using different fluid spectral beam filters

Spectral splitting photovoltaic/thermal technology is the leading field in the area of extremely efficient utilization of solar energy. Due to its complexity, experimental research on spectral splitting photovoltaic/thermal devices is relatively limited, mainly focusing on the laboratory scale energy efficiency test or calculation process verification. These studies do not provide intuitionistic guidance for the actual operation of engineering systems. In this paper, a fluid filter-based compound parabolic concentrator solar photovoltaic/thermal system with engineering application dimensions is designed and experimentally studied under actual outdoor environments. Different fluid filters are prepared and used to regulate the spectral splitting characteristics of the proposed system, including the deionized water, silver/water nanofluids and silver-cobalt sulfate/water nanofluids. When the environmental parameters are relatively stable, the method of adjusting the composition of the fluid filter is used to obtain the dynamic operating characteristics of the system. The results show that silver nanoparticles and cobalt sulfate can improve the spectral absorptivity of the deionized water. Compared with the deionized water, when the silver/water nanofluids is used as the fluid filter, the thermal efficiency of the system increases, the electric efficiency and overall exergy efficiency of the system both decrease, and the three efficiencies are 56.0%, 8.5% and 19.6%, while for the silver-cobalt sulfate/water nanofluids, the efficiencies are 58.0% 8.0% and 20.0%. Moreover, the results reveal that for the photovoltaic/thermal system with a low solar concentration ratio, by enhancing the absorptivity of the fluid filter, the fill factor of the photovoltaic module can increase, but the output electric power will decrease. When the silver-cobalt sulfate/water nanofluids is used, the fill factor and maximum output power of the proposed system are 0.633 and 69.2 W. For a unit consisting of four sets of the proposed photovoltaic/thermal systems, the emission reductions of CO2, NOx, SO2 and dust for the whole lifetime are approximately 7794.19 kg, 181.48 kg, 191.95 kg and 111.68 kg, respectively.

Thermodynamic evaluation of 2026 Power Unit technical regulation changes in Formula 1

Federation Internationale de l'Automobile (FIA) has announced a Power Unit (PU) Regulation change for its Formula 1 (F1) Championship that will become valid from the 2026 season in pursuit of carbon neutralization and a higher commercial value. The change includes a full switch to sustainable fuel and an increase in the power of the electric power output to the cars axles but removed energy retrieving and recovery from the turbocharger. The choice to use fully sustainable fuel will lead to a richer burn. On the other hand, the increase in the hybrid system capacity will outweigh the removal of energy retrieving and recovering from the turbocharger and cause an overall increase in thermal efficiency. Also, the changes are bringing a cost reduction for PU suppliers, which is an attraction for them. The increase in electric power will also integrate the car with new driving characteristics. This paper focuses on respective reviews of the 2023 and 2026 F1 PU Technical Regulations and gives an evaluation of the process for the improvements.

SCO2 power cycle/reverse osmosis distillation system for water-electricity cogeneration in nuclear powered ships and submarines

As global concerns about climate change and environmental impacts continue to grow, there is a strong demand for cleaner, greener, and more efficient propulsion solutions in the maritime industry. By leveraging nuclear energy, which offers low carbon emissions and high efficiency, naval vessels can significantly reduce their environmental footprints and contribute to global efforts to combat climate change. Additionally, the ability to produce electricity and freshwater simultaneously addresses the critical need for self-sufficiency during long missions, particularly in remote or resource-constrained areas where access to freshwater may be limited. This study explores a novel approach to address water and energy supply challenges in naval applications through a nuclear-driven supercritical carbon dioxide (sCO2) power cycle–Reverse Osmosis (RO) cogeneration system. The aim is to assess the feasibility and benefits of this system for meeting water and electricity demands in maritime operations and enhancing the sustainability, efficiency, and self-sufficiency of naval vessels with nuclear energy and advanced technologies. A parametric study has been performed to understand the effects of important parameters such as the maximum and minimum cycle temperature and pressure, seawater inlet conditions, pressure vessel design, and membrane properties on the system performance. Moreover, an optimization study has been performed to determine the best possible combination of these parameters to achieve the highest system efficiency. For the determined optimal set of parameter values, it is possible to have an sCO2 power cycle with a cycle efficiency of 40.5 %, an electrical power output of 121.6 MW and an RO system with an efficiency of 29.4 %, a recovery ratio of 29.3 %, a specific fuel consumption (SEC) of 2.29 kW·h/m3, and a freshwater production rate of 1531.6 m3/d by utilizing 145.9 kW electrical power. The positive outcomes of this study indicate that the system has the potential to be a viable and effective solution for addressing water and energy supply challenges in naval operations.

Numerical and experimental investigation of a combustor-coupled free-piston Stirling electric generator

In this paper, a novel gas combustor with multiple nozzles is proposed to couple with a free-piston Stirling electric generator (FPSG) for distributed power application. Due to the simple layout of the combustor and intrinsic external combustion of the FPSG, the system is highly adaptive to gas fuels, such as butane, natural gas and liquefied petroleum (LPG). In order to unravel the heat transfer characteristics of external combustion with internal oscillating flow, a rigorous numerical simulation was conducted, and a series of experiments were carried out to verify the calculations. Initially, an in-depth analysis was performed in terms of the flow field, temperature distribution and heat flux density within the combustor. The effects of the combustor inlet flow rate, nozzle structure, and preheating temperature on the flow heat transfer characteristics were explored. Numerical calculations reveal that, at a fuel flow rate of 0.55 Nm3/h and an air-fuel ratio of 24, the high-temperature heat exchanger (HHX) absorbs 6.41 kW heating power, with convective heat occupying approximately 73.5 %. Moreover, the simulations unveil the significant influence of optimizing the air–fuel ratio, nozzle structure, and preheating temperature on enhancing the overall heat transfer performance and achieving fuel and air consumption reductions. Subsequently, we meticulously conducted experimental investigations to comprehensively evaluate the performance of the novel combustor-coupled FPSG. The experimental results demonstrate that, under a fuel flow rate of 0.55 Nm3/h, the system achieves an output electric power of 1531 W, corresponding to a net thermal-to-electric efficiency and fuel-to-electric efficiency of 30.9 % and 9.6 %, respectively.

A comprehensive assessment of the hybrid power generation system of PEMFC and internal combustion engine based on ammonia decomposition

This study presents a hybrid power generation system that combines a proton exchange membrane fuel cell (PEMFC) and an internal combustion engine (ICE), utilizing ammonia decomposition as the primary fuel source. The system comprises various components, including an ammonia decomposition subsystem, PEMFC, ICE, heat exchanger, solenoid valve, and power electronic converter. The research focuses on evaluating the system's performance by analyzing the impact of key thermodynamic parameters, such as decomposition temperature and separation ratio, as well as economic factors like ammonia and hydrogen prices, and service life. The findings reveal that the hybrid power generation system achieves a maximum output power of 16.23 kW and an efficiency of 50.28 %. Furthermore, it is observed that when the power ratio (α) between PEMFC and ICE is set to 1.2, the system achieves optimal electric power output. The levelized cost of energy (LCOE) for the system is calculated to be 0.0774 $ kWh−1 when the ammonia price is 0.35 $ kg−1. Additionally, the system exhibits a significant reduction in greenhouse gas (GHG) emissions, with an estimated decrease of 4.39 × 107 g. The hybrid power generation system has excellent thermodynamic, economic, and environmental performance, which lays a foundation for promoting the spread of high efficiency and zero pollution distributed hybrid power generation system.

Energy, exergy, economical and environmental analysis of photovoltaic solar panel for fixed, single and dual axis tracking systems: An experimental and theoretical study

This investigation focuses on energetic, exegetic, economical and environmental analysis of PV solar system using fixed, single- and dual-axes tracking systems under climatic weather of Zakho city/north of Iraq. Experiments are carried out on 5th September 2022. The energy and exergy analyses are used to predict the performance of three solar panels. The theoretical work includes technical, economical and environmental analysis of proposed 1 MW PV solar power plant are presented using similar characteristics of the experimental data of hourly meteorological climatic conditions during 2022. The findings display that the tracking systems have significant influences on 4–E performances. The experimental results displayed that electrical output power gain and thermal exergy output are increased when using tracking systems, where the exergy losses for single- and dual-axes tracking systems are decreased as compared to fixed solar plane. The maximum improvements in the electrical output power gain of PV solar panels using dual– and single–axes tracking systems are nearly reached to 40 % at 8 a.m., 13 % (for single) and 20 %(for dual) at 12 p.m. and 30 % at 17PM as compared to fixed solar panel. The theoretical results display that the yielded produced energy for single- and dual-axes are increased by 16.5 % and 25.5 %, respectively, as compared to fixed panel. The economic findings display that the cost of energy for single-axes, dual-axes and fixed tracking systems are 4.89, 4.41 and 8.26, respectively. Finally, the use of tracking systems reduces the CO2 emission about 4000–4500 tCO2 annually.

Development of an electromagnetic energy harvester for ultra-low frequency pitch vibration of unmanned marine devices

Pitch vibrations can be commonly observed in unmanned marine devices under wave excitation, but there is relatively little research on harvesting the energy from the pitch vibrations with ultra-low frequency. This work develops a novel built-in electromagnetic energy harvester using rope transmission to provide sustainable power supply for onboard electronics. It has the advantages of low friction and compact structure, which is suitable for installation inside an autonomous underwater vehicle with slender cylindrical shape. Dynamic modeling and linearization approach are employed to analyze its energy harvesting performance theoretically. A scalable prototype is fabricated and tested on a motion platform with six degrees of freedom by simulating periodic pitch vibration. The results show that the prototype can output electrical power with the peak value of 1663 mW and the average value of 315 mW at the excitation frequency of 0.6 Hz. It also has competitive energy extraction efficiency and the maximum value reaches 33.23%. The experimental data are in good agreement with the theoretical data, which verifies the effectiveness of the theoretical model. The developed energy harvester can serve as a potential candidate for powering the electronics on unmanned marine devices.

Influence of circuit on power generation performance of wave energy power generation device using oscillating water column technology

In order to study the influence of the load circuit on the system efficiency and power oscillation of the oscillating water column device, a unified modeling model of the oscillating water column device is built for simulation. According to the coupling relationship in various fields of the oscillating water column device, the differential equation of motion of the turbine generator set is established. The power plant components and systems are modeled by Modelica language. Based on this system, the system-level simulation is carried out and the load circuit is optimized. In addition, experimental tests of the traditional load circuit and the modified load circuit are carried out. Results indicate that the modified load circuit can increase the speed of the turbine to better follow the airflow and balance the system damping, thereby improving the system efficiency. Increasing resistance can reduce the fluctuation of output electric power. Different battery, resistance and generator parameters can cause differences in system efficiency. The research results provide a reference to improve the performance of oscillating water column device.