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近年来,随着制冷空调机械的普及,节能问题已提到日程。作为长远目标和近期发展,压缩机、热交换器、风机的性能及控制技术均在不断地提高。本文介绍最近研制及市场上出售的一些热交换器用传热管,叙述传热技术改进的动向及其效果。一、管内蒸发、冷凝用内螺纹管该管内面有很多微细的螺旋状沟槽,与普通的平滑管比较,具有以下优点: 改善了冷媒的流动形式,可以取得高于内表面积增加率的传热系数(约1.5～2倍); 管内压力损失与平滑管大致相当;
In recent years, with the popularity of refrigeration and air conditioning machinery, energy saving issues have been mentioned schedule. As a long-term goal and the recent development, the performance and control technology of compressors, heat exchangers and fans are continuously improving. This article describes some recently developed and commercially available heat exchanger tubes for heat exchange, describing the trends and effects of heat transfer improvements. First, the tube evaporation, condensation tube with a number of threads inside the tube with a lot of fine spiral groove, compared with ordinary smooth tube, has the following advantages: Improved refrigerant flow patterns, you can get higher than the increase in the internal surface area of the pass Thermal coefficient (about 1.5 to 2 times); tube pressure loss and smooth tube roughly the same;