摘要
从翅片效率、单个换热单元的传热系数和整个换热器的换热量三个方面对不同翅片结构、不同管子结构和不同工况下的翅片管换热器由铝翅片换为铜翅片前后的换热特性和成本进行了分析比较;详细给出了各个结构和工况参数单独变化对换铜前后的翅片效率、单位制冷剂侧换热面积上的总传热:系数和换热器换热量的影响规律。分析结果发现,翅片越薄、越高,管外径越小,风速越大时,换铜:后的翅片管的换热能力增强越大,成本增加越小。在所选择的结构和工况范围内,铜管铜片换热器比铜管铝片换热器的翅片效率约提高0.938％-29.86％、总传热系数约提高9.88％-23.23. 276％、总换热量约提高0.112％-22.3％;对于典型的1.1kW空调器的蒸发器,材料成本约增加8-42元,体积可最多缩小18％。
In this part, the fin efficiency, heat transfer coefficient and heat-transfer capability of heat exchangers are analyzed and compared when using the copper fin instead of aluminum fin. During the process of the analysis and comparison, the work conditions and geometries of fins and tubes are changed in a suitable selected data range. The effect of the independent variation of the work conditions and geometries of fins and tubes are also presented in detail. It shows that, after using the copper fin instead of aluminum fin, the heat-transfer capability of the heat exchanger is improved higher and the increase of cost is lower when the fins are thinner & higher, the tube-diameters are smaller and the wind velocity is higher. In the selected data range the fin efficiency can be increased 0.938%-29.86%, the total heat transfer coefficient can be increased 9.88% ~ 23.276% and the heat-transfer capability can be increased 0.112% - 22.3% with an cost increase of 8-42 RMB and volume decrease of up to 18% for a typical evaporator of room air conditioner when aluminum fin is replaced by same geometry copper fin.
出处
《制冷空调与电力机械》
2004年第4期4-9,共6页
Refrigeration Air Conditioning & Electric Power Machinery
