In the four-layer pipe aluminum tube fin evaporator, there is a close and complex relationship between the fin spacing and the air flow resistance, which profoundly affects the overall performance of the evaporator.
First, the fin spacing has a direct shaping effect on the air flow path. When the fin spacing is large, the air flow channel in the evaporator is relatively spacious, and the air flow can pass more smoothly. For example, in some large refrigeration equipment with high ventilation requirements, a larger fin spacing allows a large amount of air to quickly pass over the evaporator surface. At this time, the air flow resistance is small, which can ensure that the equipment can operate stably under a large air volume, which is conducive to the rapid exchange and transfer of heat. However, a larger fin spacing also means that the number of fins per unit volume is relatively reduced, and the heat exchange area is correspondingly reduced, which will weaken the heat exchange efficiency of the evaporator to a certain extent.
Secondly, as the fin spacing gradually decreases, the number of fins per unit volume increases, and the heat exchange area is increased, which is conducive to improving the heat exchange capacity of the evaporator. But at the same time, the air flow channel becomes narrower, and the probability of air molecules colliding with the fins increases significantly, resulting in a significant increase in air flow resistance. In some small refrigeration devices with compact space requirements, although a small fin spacing can achieve higher heat exchange efficiency, excessive air circulation resistance may increase fan power consumption and even affect the air volume circulation of the entire refrigeration system, thereby affecting the uniformity and stability of the refrigeration effect.
Furthermore, the relationship between fin spacing and air circulation resistance is also affected by air flow rate. Under low wind speed conditions, the increase in air circulation resistance caused by a smaller fin spacing is relatively small. At this time, appropriately reducing the fin spacing can improve heat exchange efficiency without increasing resistance too much. At high wind speeds, a slight change in fin spacing will cause a sharp change in air circulation resistance. Therefore, it is necessary to choose the fin spacing more carefully to balance the contradiction between heat exchange efficiency and air circulation resistance.
Finally, in order to achieve the best performance balance, when designing a four-layer pipe aluminum tube fin evaporator, it is necessary to comprehensively consider multiple factors such as the use scenario of the equipment, refrigeration requirements, and fan power. Through precise theoretical calculations, simulation experiments and actual tests, the appropriate fin spacing is determined to keep the air circulation resistance within an acceptable range while maximizing the heat exchange efficiency of the evaporator, thereby achieving efficient and stable operation of the refrigeration system.
