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首页> 外文会议>International refrigeration and air conditioning conference at purdue >POTENTIAL OF BRAZED FINNED TUBE HEAT EXCHANGERS IN COMPARISON TO MECHANICAL PRODUCED FINNED TUBE HEAT EXCHANGERS
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POTENTIAL OF BRAZED FINNED TUBE HEAT EXCHANGERS IN COMPARISON TO MECHANICAL PRODUCED FINNED TUBE HEAT EXCHANGERS

机译：与机械生产的翅片管热交换器相比，钎焊翅片管热交换器的潜力

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摘要

Mechanically assembled finned tube heat exchangers are currently used for most refrigeration and domestic A/C systems. The tubes and fins of such heat exchangers mostly consist of different metals, e.g. copper and aluminum. The system weight, especially in mobile systems, can be reduced when only aluminum is used for the constructions. For the last 15 years micro channel heat exchangers were developed for automotive air conditioning systems. For this design the aluminum fins are brazed between aluminum profiles in order to increase the heat transfer, the efficiency and the design flexibility. In addition to the reduction in heat exchanger size and weight, these systems can be operated with lower refrigerant charge. All aluminum heat exchangers show advantages concerning recycling. Literature researches have shown an increase of heat transfer for brazed designs in comparison to mechanical designs. The contact resistance between the tube and the fin is reduced and the heat transfer performance is improved. Capacity measurements were carried out to confirm the theoretical considerations and to show the potential of brazed heat exchangers. Mechanically produced and brazed heat exchangers of identical dimensions and designs were simultaneously investigated in a wind tunnel. All internal and external values were kept constant during the measurements. The heat exchangers were water heated and air cooled during the experiments.
机译：机械组装的翅片管热交换器目前用于大多数制冷和国内A / C系统。这种热交换器的管和翅片主要由不同的金属组成，例如，例如不同的金属组成。铜和铝。当仅用于结构时，可以减少系统重量，特别是在移动系统中，可以减少。对于过去15年来微通道热交换器用于汽车空调系统。对于这种设计，铝翅片在铝型材之间钎焊，以增加传热，效率和设计灵活性。除了减少热交换器尺寸和重量之外，这些系统可以用较低的制冷剂电荷操作。所有铝热交换器都显示出循环回收的优点。与机械设计相比，文献研究表明，钎焊设计的热传递增加。降低管和翅片之间的接触电阻，并改善了传热性能。进行容量测量以确认理论考虑因素，并展示钎焊热交换器的潜力。同时在风洞中同时研究了机械制作的相同尺寸和设计的钎焊热交换器。在测量期间，所有内部和外部值都保持恒定。热交换器是水加热，在实验期间冷却空气。

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