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建立了真空集热管端部热损失的两种实验评估方法,研究表明端部覆盖时的热损失曲线明显低于端部暴露实验,并更接近一维模型的理论曲线。吸收管温度约300℃时,暴露端部的热损失约为200W,造成24.77%的额外热损失,覆盖端部的额外热损失仅为7.24%,且端部暴露时热损失对风速敏感。总的来说,集热管的热损失测试应在端部覆盖的情况下进行,以得到精确的热损失曲线;在实际运行中,集热管的端部也必须有保温材料完全包裹,以避免额外的热损失。
Two experimental evaluation methods of heat loss at the end of vacuum tube were established. The results show that the heat loss curve at the end of the tube is obviously lower than that of the end exposure and closer to the theoretical curve of the one-dimensional model. Absorption tube temperature of about 300 ℃, the exposed end of the heat loss of about 200W, resulting in 24.77% additional heat loss, cover the end of the additional heat loss of only 7.24%, and the end of the heat loss is sensitive to wind speed. In general, the heat-loss test of the heat-collecting tube should be carried out with the end covered to obtain the accurate heat-loss curve. In actual operation, the ends of the heat-collecting tube must also be completely wrapped with the heat-insulating material to avoid extra The heat loss.