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试验测试了一种可用于满液式壳管换热器的管外侧强化沸腾和强化冷凝的双效强化传热管。用热阻分离法计算了使用R134a制冷剂时制冷剂侧和水侧的表面传热系数。试验结果表明,在较大的热流密度(大于20kW/m2)下该管较传统的强化沸腾传热管具有较大的池沸腾表面传热系数;在较大的热流密度(大于15kW/m2)下较传统的强化冷凝管具有较大的管外冷凝表面传热系数。
A double-effect heat transfer tube for enhanced boiling and enhanced condensation on the outside of the tube for a flooded shell-and-tube heat exchanger was tested. The heat transfer coefficient of the refrigerant side and the water side of R134a refrigerant was calculated by the thermal resistance separation method. The experimental results show that the heat transfer tube has a larger pool surface boiling heat transfer coefficient than the conventional enhanced boiling heat transfer tube at larger heat flux (greater than 20 kW / m 2). At large heat flux (greater than 15 kW / m 2) Compared with the traditional enhanced condenser tube has a larger tube outside the condensation surface heat transfer coefficient.