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| 水平单管内换热实验研究 |
| Experimental study on the heat transfer in single horizontal tube |
| 投稿时间：2014-05-16 |
| DOI：10.13259/j.cnki.eri.2016.03.008 |
| 中文关键词: 系统设计 水平换热管 蒸发 冷凝 R22 |
| 英文关键词:system design horizontal heat transfer tube evaporation condensation R22 |
| 基金项目:国家高技术研究发展计划项目（2008AA05Z204） |
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| 中文摘要: |
| 利用隔膜泵作为系统动力输出源，搭建了单管内传热和流动测试实验台，对制冷剂R22在水平单管内的换热性能进行了实验研究，考察了不同蒸发温度和不同冷凝温度对总传热系数、制冷剂表面换热系数和管内压降的影响.实验结果表明：总传热系数和制冷剂表面换热系数均随着蒸发温度和冷凝温度的上升而增大；管内压降随着蒸发温度的上升而减小，随着冷凝温度的上升而增大；对于同一根实验管，在相同的冷却水流量和制冷剂质量流量下，最佳蒸发工况为10℃；冷凝实验中，总传热系数和制冷剂表面换热系数在40℃时高于其他两种冷凝温度时的值，但35℃冷凝时，管内压降高于其他两种工况. |
| 英文摘要: |
| A heat transfer and flow test platform with diaphragm pump as the power source was set up to study the heat transfer characteristics of R22 in single horizontal tube.The influences of evaporation temperature and condensation temperature on the overall convection heat transfer coefficient,the surface heat transfer coefficient,and the pressure drop in the tube were investigated.Experimental results showed that both and rose with the increasing of the evaporation temperature and condensation temperature.The pressure drop reduced with the growing of evaporation temperature while increased with the rising of condensation temperature.For the same test tube,the best evaporation condition of 10℃ was achieved at the same flow rate of cooling water and mass flow rate of refrigerant.In the condensation experiment,both and at 40℃ were higher than those at the other two temperatures.However,the pressure drop at 35℃ in the tube was higher than those under the other two conditions. |
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