Simulation Study of Temperature Difference Energy Conversion Technology of Polar Ice-Based Buoys
In order to solve the problem of power supply of marine observation and communication navigation nodes(Ice tethered platform)in the Arctic sea,the paper proposes to convert the thermal energy derived from the temperature difference between the air temperature above the ice and the seawater temperature below the ice to electrical energy for the ice tethered platform.According to the spatiotemporal distribution characteristics of Arctic temperature difference and the application scenarios of ice-based buoys,a thermoele-ctric power generation system based on the organic Rankine cycle of ice-based buoys is proposed,and it is modeled and analyzed.The overall structure of the conversion system and the preliminary selection of the working fluid of the organic Rankine cycle are described.According to analysis results of the thermodynamic cycle performance of the five working fluid,R124 is chosen.The simulation results show that the total electrical output of the thermal energy conversion system during two months of winter in the Arctic is around 745 kWh,which is equivalent to the total electrical energy of 3.72 t lithium battery(energy density of 200 Wh/kg).It is indicated that the Arctic thermal energy conversion system can output considerable power and electricity.The electrical energy can significantly improve the energy level of the ice tethered platform,and thus improve its observation capabilities and extends its continuous working time,Reduce the frequency of maintenance by icebreakers,so as to build a key node of the subglacial observation network and support the construction of the Arctic subglacial mobile observation network.
ice tethered platformOrganic Rankine Cyclethermal energy conversionarctic under-ice observation
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