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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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太阳能发电热管吸热器相变蓄热单元性能分析
, PP. 37-42
Keywords: 太阳能发电,热管吸热器,相变,空穴,蓄热单元,蓄/放热过程
Abstract:
基于微重力条件下的导热控制微分方程,采用焓法建立热管吸热器相变蓄热单元计算模型,对微重力条件下热管吸热器蓄热容器的相变传热过程进行了模拟计算,分析了空穴率对蓄热容器内部的温度场和热性能的影响。结果表明:经与美国国家航空航天局(nasa)方案进行比较,所建立的计算模型合理、准确,能够较好地模拟热管吸热器蓄热单元蓄、放热过程;热管吸热器壁温与相变蓄热容器温度非常接近,包含着相变材料的整个热管起着均匀热负荷的作用,与基本型吸热器相比热管吸热器相变材料熔化率大幅提高,相变材料利用率较高;随着空穴率的增大,相变材料利用率降低,相变材料容器的蓄热能力降低,同时相变蓄热容器内温度梯度增大,可能导致该处热应力过大,从而降低其使用寿命。
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