蒸发式冷凝器中蒸发冷条件下单管换热实验研究

Experimental Study on Single Tube Heat Transfer under Evaporative Cooling Condition

以蒸发式冷凝器为模型,搭建了在蒸发冷条件下单管的换热试验台,并以水蒸气为实验工质对试验台的热力性能进行实验,为蒸发式冷凝器确定统一标称提供实验依据。结果表明:本试验台换热管两侧为冷壁面,其对冷凝效果影响显著,按蒸发式冷凝器理论计算结果,实验测得冷凝量提升30%到40%;考虑换热单管两侧冷壁面对喷淋水的影响,通过理论计算得到的结果与实际测试结果较为一致;经过测试,喷淋密度0.078kg/(m·s),迎面风速为3m/s时,冷凝效果最优。

Taking the evaporative condenser as a model, a single-tube heat exchange test bench under evaporative cooling conditions was built, and the thermal performance of the test bench was tested with steam as the experimental working fluid, to provide an experimental basis for determining the uniform nominal for evaporative condensers. The results show that: the two sides of the heat exchange of the test bench are cold wall surfaces, which have a significant impact on the condensation effect. According to the theoretical calculation results of evaporative condenser, the condensation volume measured in the experiment increased by 30% to 40%;Considering the influence of the cold wall surfaces on both sides of the heat exchange single tube on the spray water, the results obtained by theoretical calculation are consistent with actual test results;After the test, when the spray density is 0.078 kg/(m·s) and the wind speed is 3 m/s, the test bench has the best condensation effect.