Influence of freestream humidity value on the frosting and defrosting performances of the microtubule heat exchanger
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摘要:
当自由来流的温度和速度分别为50 ℃和10 m/s时，在两个不同的自由来流湿度值（1.8 g/kg和6.4 g/kg）条件下，对微细管式换热器分别开展了结霜和抑霜的地面实验研究。结霜和抑霜地面实验结果均表明，自由来流的湿度值对微细管式换热器的结霜和抑霜性能均具有明显的影响。在结霜实验中，凝结霜层的量随着自由来流湿度值的增大而增大，但是两者之间不成正比关系；且自由来流的湿度值越大，换热器管束的壁面温度越低，自由来流的压力损失系数的增长率越大，换热器的换热率越低。然而，在抑霜实验中，凝结霜层的量和自由来流的压力损失系数均不随着自由来流湿度值的增大而增大；且随着自由来流湿度值的增大，换热器管束的壁面温度增大，换热器的换热率减小。
Abstract:When the temperature and flow velocity of the freestream were 50 ℃ and 10 m/s, respectively, ground experimental studies on frosting and defrosting of the microtubule heat exchanger were carried out, respectively, under the conditions of two different freestream humidity values (1.8 g/kg and 6.4 g/kg). The ground experimental results showed that the freestream humidity value had significant influence on the frosting and defrosting performances of the microtubule heat exchanger. In the frosting experiments, the amount of frost layer increased with the increase of the humidity value of the freestream, but the relationship between them was not proportional. The greater freestream humidity value indicated the lower wall surface temperature of the heat exchanger tube bundle, and the higher growth rate of the pressure loss coefficient of freestream indicated the lower heat transfer rate of heat exchanger. However, in the defrosting experiments, the amount of frost layer and the pressure loss coefficient of freestream did not increase with the increase of freestream humidity value. And with the increase of freestream humidity value, the wall surface temperature of heat exchanger tube bundle increased, and the heat transfer rate of the heat exchanger decreased.
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图 1 微细管式换热器结霜和抑霜实验的流路图
Figure 1. Schematic of flow path of frosting and defrosting experiments of the microtubule heat exchanger
图 3 微细管式换热器和实验段的三维装配图
Figure 3. Three-dimensional assembly drawing of the microtubule heat exchanger and experimental section
图 4 实验工况a-1在第600 s时的结霜实验结果
Figure 4. Frosting experiment result of the experimental condition a-1 at 600 s
图 5 实验工况a-2在第600 s时的抑霜实验结果
Figure 5. Defrosting experiment result of the experimental condition a-2 at 600 s
图 6 实验工况a-3在第600 s时的结霜实验结果
Figure 6. Frosting experiment result of the experimental condition a-3 at 600 s
图 7 实验工况a-4在第600 s时的抑霜实验结果
Figure 7. Defrosting experiment result of the experimental condition a-4 at 600 s
图 8 不同结霜和抑霜实验工况的压力损失系数分布曲线
Figure 8. Distribution curves of the pressure loss coefficient under different frosting and defrosting experimental conditions
图 9 不同结霜和抑霜实验工况的微细管式换热器管束的壁面温度曲线分布
Figure 9. Distribution curves of the wall surface temperature of the microtubule heat exchanger under different frosting and defrosting experimental conditions
图 10 不同结霜和抑霜实验工况的换热率分布曲线
Figure 10. Distribution curves of heat transfer rate under different frosting and defrosting experimental conditions
表 1 微细管式换热器的结霜和抑霜实验工况
Table 1. Conditions of the frosting and defrosting experiments of the microtubule heat exchanger
实验工况 自由来流
温度t/℃自由来流
速度u/（m/s）自由来流
湿度值H/（g/kg）是否喷射甲醇及
相应质量比实验工况
编号湿度值对微细管式
换热器结霜和
抑霜性能的影响50 10 1.8 否
0a-1 是
1.0a-2
6.4否
0a-3 是
1.0a-4 
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表 2 结霜和抑霜地面实验使用的测量仪器及其测量误差
Table 2. Measuring instruments and errors in the frosting and defrosting ground experiments
Pt100型热电阻/℃ T型热电偶/℃ 湿度传感器/% 压力传感器/% 浮子流量计/% 热式流量计/% 涡街流量计/% ±0.3 ±0.3 ±0.3 ±0.5 ±1.0 ±1.5 ±1.5
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