Analysis and Research on Cold Proof Design of Polar Marine Machinery

Polar marine machinery is an important equipment for China to participate in Arctic energy exploitation. The Arctic region is rich in natural resources and has a very important strategic position. As an important equipment for passage and exploitation of energy, its key technology is particularly important. As a special ship sailing in polar regions, polar ships generally adopt electric heat tracing measures due to the adverse environment in polar regions. The deck machinery and facilities shall be protected against cold. This paper mainly studies the convection of flat plate members under constant heat flow electric heating. The research results can be popularized and applied to the cold protection of most upper facilities of polar ships.

Design And Power Generation Performance Analysis of A Rim-Driven Wave Energy Generator

Wave energy exploitation is getting more attention from researchers Many types of devices that can convert wave energy into electricity have been designed. At present, engineers and scientists are researching how to make a simple and efficient wave energy capture device. This paper explored the rim-driven generator. In a rim-driven wave energy generator, the rotor blade could harvest kinetic energy of wave motions. The blade is inside of the generator and the gap between the stator and the rotor is water-filled. This structure could improve the compactness and reliability of the wave energy generator. The paper studied the influence of the arrangement of the blade and the structure of the generator on the performance of the generator. Analytical models were designed to obtain generator’s performance. The result could optimize the design of generator and improve the energy conversion efficiency.

Clouds and aerosol effects on solar energy in Cyprus

<p>Cyprus focuses on increasing the share of its renewable energy resources from 13.9% in 2020 to 22.9% in 2030, with solar energy exploitation systems to be one of the main pillars of this effort, due to the high solar potential of the island. In this study, we investigated the effect of clouds as well as aerosols, and especially dust, on the downwelling surface solar irradiation in terms of Global Horizontal Irradiation (GHI) and Direct Normal Irradiation (DNI). In order to quantify the effects of clouds, aerosols and dust on different surface solar radiation components, we used the synergy of satellite derived products for clouds, high quality and fine resolution satellite retrievals of aerosols and dust from the newly developed MIDAS dataset, and radiative transfer modeling (RTM). GHI and DNI climatologies have been also developed based on the above information. According to our findings, clouds attenuate ~25 – 30% of annual GHI and 35 – 50% of annual DNI, aerosols attenuate 5 – 10% and 15 – 35% respectively, with dust being responsible for 30 – 50% of the overall attenuation by aerosols. The outcomes of this study are useful for installation planning and for estimating the PV and CSP performance on a short-term future basis, helping towards improved penetration of solar energy exploitation systems in the electric grid of Cyprus. Furthermore, they are strongly linked to Affordable and Clean Energy (SDG 7) which has a central role in national climate plans and requires services in energy meteorology, climate applications of satellite data, and providing high quality wind and radiation data.</p><p> </p><p><strong>Acknowledgements</strong></p><p>This study was funded by the EuroGEO e-shape (grant agreement No 820852) and EXCELSIOR (grant agreement No 857510)</p>