Volume- 2
Issue- 5
Year- 2015
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Wenliang Zhang , Zhesong Ma
A simplified phase-change energy storage system for the thermal engine of thermal underwater glider was presented in this paper. Based on the simplified system, the stored energy of each operation cycle and volume contraction during PCM solidification process was analyzed. The effect of four main factors which can affect the volume contraction and energy storage was studied analytically and simulated, including air solubility in liquidus PCM, residual air within the system, pressure of low pressure oil tank and pressure of high pressure oil tank. In usual parameter configuration, system pressure increases gently until 53% of PCM melts, it means actual PCM for energy storage is less than half and its utilization ratio is very low. Dissolved air in the liquidus PCM and residual air in the phase-change energy storage system can seriously reduce the stored energy during each operating cycle of thermal underwater glider. So the residual air needs to be strictly eliminated. Besides that, under reasonable parameter configuration, such as improving the pressure of high pressure oil tank can greatly improve the stored energy.
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National Ocean Technology Center, China
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