Effect of operational parameter on the heat transfer in a heat receiver
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摘要: 针对3种不同相变温度的相变材料组成的组合吸热器,建立了相应的物理模型,给出了数值求解方法,计算了工质入口温度、工质流速及输入功率等操作参数对组合式吸热器热性能的影响,得到了容器壁面最高温度、工质出口温度、换热管总相变蓄热材料(PCM)熔化率等结果.结果表明操作参数对吸热器热性能有较大的影响,合理选取这些参数对吸热器的正常运行是非常必要的,结果可以用于指导吸热器的设计.Abstract: It is possible to solve some problems using the three different multiple phase change material to replace single kind of high-temperature phase change material in heat receiver for NASA 2 kW solar dynamic power system. The heat receiver model was established. The corresponding numerical methods were described. Tube maximum temperature, gas exit temperature and liquid phase change material fractions were calculated based on working parameter such as gas inlet temperature, receiver heat input and gas mass flow rate. Results indicate that parametric changes in receiver gas inlet temperature and receiver heat input effects higher sensitivity to changes in receiver gas exit temperatures. Selecting these parameter is very important to improve the heat receiver thermal performance.
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Key words:
- solar electrical energy generation /
- thermal properties /
- operation /
- heat receiver /
- parameter
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