利用流程矩阵建立适用任意流路连接方式的翅片管换热器稳态性能仿真模型并且模拟换热器在干、湿工况下的性能。在有分支流路的情况下,采用流量自适应方法调节各支路流量并平衡各支路压降。模型中采用预测性能好的Gungor和Shah换热关联式...利用流程矩阵建立适用任意流路连接方式的翅片管换热器稳态性能仿真模型并且模拟换热器在干、湿工况下的性能。在有分支流路的情况下,采用流量自适应方法调节各支路流量并平衡各支路压降。模型中采用预测性能好的Gungor和Shah换热关联式和Müller-Steinhagen and Heck压降关联式,换热器空气侧考虑翅片不同形式而选取不同换热关联式以提高仿真模型精度。该模型仿真结果与文献中数据进行对比并模拟分析风速均匀性的影响。结果显示仿真程序预测的沿程管壁温度变化趋势和实验值一致,换热量误差在±10%以内,压降误差在±20%以内。在风速均匀和非均匀的条件下进行仿真计算,结果显示在非均匀风速条件下的换热量要小于均匀风速条件下的换热量,并且非均匀风速条件下的模拟结果与实验结果吻合度更高。展开更多
The heat and mass transfer characteristics under frosting on surface of heat exchanger were experimentally investigated in different conditions of air temperature, relative humidity, and face velocity. The heat transf...The heat and mass transfer characteristics under frosting on surface of heat exchanger were experimentally investigated in different conditions of air temperature, relative humidity, and face velocity. The heat transfer and heat transfer coefficient decreased faster with the high relative humidity, low air temperature and initial face velocity. The air pressure drop rose faster with the high relative humidity and low air velocity.展开更多
文摘利用流程矩阵建立适用任意流路连接方式的翅片管换热器稳态性能仿真模型并且模拟换热器在干、湿工况下的性能。在有分支流路的情况下,采用流量自适应方法调节各支路流量并平衡各支路压降。模型中采用预测性能好的Gungor和Shah换热关联式和Müller-Steinhagen and Heck压降关联式,换热器空气侧考虑翅片不同形式而选取不同换热关联式以提高仿真模型精度。该模型仿真结果与文献中数据进行对比并模拟分析风速均匀性的影响。结果显示仿真程序预测的沿程管壁温度变化趋势和实验值一致,换热量误差在±10%以内,压降误差在±20%以内。在风速均匀和非均匀的条件下进行仿真计算,结果显示在非均匀风速条件下的换热量要小于均匀风速条件下的换热量,并且非均匀风速条件下的模拟结果与实验结果吻合度更高。
文摘The heat and mass transfer characteristics under frosting on surface of heat exchanger were experimentally investigated in different conditions of air temperature, relative humidity, and face velocity. The heat transfer and heat transfer coefficient decreased faster with the high relative humidity, low air temperature and initial face velocity. The air pressure drop rose faster with the high relative humidity and low air velocity.
