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介绍一种全新的平板式太阳集热器,该集热器应用微热管阵列作为集热元件,具有成本低、抗冻、承压、不易结垢、易与建筑一体化等优点。对其瞬时热性能进行的实验研究表明,该集热器瞬时效率曲线的截距达83.1%,斜率为-4.77。建立了微热管阵列平板太阳集热器的CFD模型,对集热器内部流体流动与换热进行数值模拟,模拟结果与实验结果吻合较好,从而验证了模型的可靠性。采用CFD模型对集热器干式接触式换热器进行优化,结果表明,该集热器循环水的最佳流量为0.1~0.2 kg/(m2·s),水流量较低时,采用直内肋管可适当提高集热效率,随着流量的增加,管内加肋对集热器性能的提高影响不大。
This paper introduces a brand new flat plate solar collector which has the advantages of low cost, frost resistance, pressure resistance, easy scaling and easy integration with the building by using the micro heat pipe array as the heat collecting element. An experimental study of its instantaneous thermal performance shows that the instantaneous efficiency curve of the collector has an intercept of 83.1% with a slope of -4.77. The CFD model of micro-heat pipe array flat-panel solar collectors was established to simulate the fluid flow and heat transfer in the collector. The simulation results agree well with the experimental results, which verifies the reliability of the model. The CFD model was used to optimize the heat exchanger’s dry contact heat exchanger. The results showed that the optimum flow rate of circulating water was 0.1 ~ 0.2 kg / (m2 · s). When the water flow rate was low, Inner rib can be properly increased collector efficiency, with the flow rate increases, the ribs on the tube to improve the performance of the collector has little effect.