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Two-dimensional model of a Space Station Freedom thermal energy storage canister

机译:空间站自由储热罐的二维模型

摘要

The Solar Dynamic Power Module being developed for Space Station Freedom uses a eutectic mixture of LiF-CaF2 phase change salt contained in toroidal canisters for thermal energy storage. Results are presented from heat transfer analyses of the phase change salt containment canister. A 2-D, axisymmetric finite difference computer program which models the canister walls, salt, void, and heat engine working fluid coolant was developed. Analyses included effects of conduction in canister walls and solid salt, conduction and free convection in liquid salt, conduction and radiation across salt vapor filled void regions and forced convection in the heat engine working fluid. Void shape, location, growth or shrinkage (due to density difference between the solid and liquid salt phases) were prescribed based on engineering judgement. The salt phase change process was modeled using the enthalpy method. Discussion of results focuses on the role of free-convection in the liquid salt on canister heat transfer performance. This role is shown to be important for interpreting the relationship between ground based canister performance (in l-g) and expected on-orbit performance (in micro-g). Attention is also focused on the influence of void heat transfer on canister wall temperature distributions. The large thermal resistance of void regions is shown to accentuate canister hot spots and temperature gradients.
机译:正在为自由空间站开发的太阳能动态功率模块使用环形罐中包含的LiF-CaF2相变盐的低共熔混合物来进行热能存储。结果来自相变含盐罐的传热分析。开发了二维,轴对称有限差分计算机程序,该程序可对罐壁,盐,空隙和热机工作流体冷却剂进行建模。分析包括罐壁和固体盐中的传导,液体盐中的传导和自由对流,盐蒸气填充的空隙区域中的传导和辐射以及热机工作流体中的强制对流的影响。根据工程判断,规定了空隙形状,位置,生长或收缩(由于固盐和液相盐相之间的密度差异)。使用焓法对盐相变过程进行建模。对结果的讨论集中在液体盐中自由对流对罐传热性能的作用。已显示该作用对于解释基于地面的罐性能(以g为单位)与预期在轨性能(以微g为单位)之间的关系非常重要。还应注意空隙传热对罐壁温度分布的影响。空隙区域的大热阻显示加剧了罐的热点和温度梯度。

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