Factors restricting the effectiveness of the cooler
Source: http://le-signal.com/ Time: 2018-12-07
When the cooler is used, it is often affected by various factors such as the medium used, the material of the cooler, and the spacing to reduce its cooling effect. The main factors are: liquid substances. In a certain temperature range, the viscosity of the matrix is low, and the fluidity becomes better. In this way, the internal friction of the liquid substances will be reduced, which will improve the heat transfer effect and increase the thermal conductivity. Large, thereby reducing the cooling effect of the tube oil cooler.
Different metal pipe materials have different thermal conductivity coefficients. Generally, metal materials with good electrical conductivity have good thermal conductivity, but they will affect the cooling effect of the cooler; the viscosity of the substrate is 450Pa.s at room temperature when it comes into contact with the pipe wall. Will produce strong adhesion. When the metal surface becomes rough, a layer of substrate will adhere to the surface. The rougher the surface of the tube wall, the thicker the adhesion layer will become. If the adhesion layer is continuously cooled, the adhesion will become stronger. The thermal resistance is the sum of the thermal resistance of this layer of adherent and the metal pipe wall, which will reduce the heat transfer coefficient. It can be seen from the heat conduction formula that the cooling effect is proportional to the area where the substrate is in contact with the metal pipe wall. That is, the larger the area of contact between the substrate and the metal pipe wall, the better the cooling effect; when the ΔT is large, the Q value of the heat exchange is large. When the water temperature of the cooling water is below 40 degrees, as the temperature of the cooling water continues to decrease, the temperature of the substrate will continue to increase, that is, as the temperature changes, the substrate adhering to the wall of the metal pipe will become more and more thick. When the water temperature of the cooling water is above 40 degrees, the temperature change will change greatly, so that the cooling effect of the tubular oil cooler becomes better.
When the distance between the two rows of tubes of the tube-type oil cooler is increased, the difference between the central substrate temperature between the two tubes and the substrate temperature on the tube wall becomes larger, and vice versa, because the distance becomes larger When the resistance of the substrate moves, the resistance of the substrate will decrease. Once the resistance decreases, the temperature of the central substrate between the two tubes will rise, while the temperature of the substrate on the tube wall will not change, the temperature difference will increase, otherwise the resistance and temperature difference will increase. Will become smaller. In addition to the temperature difference, the size of the gap is also affected by factors such as the water temperature of the cooling medium, the temperature of the oil phase condensation point, and the daily pressure of the screw pump when the substrate is moving. When the substrate temperature and the temperature on the tube wall are small, the force required to move the substrate will be reduced. At this time, the pressure on the substrate will be reduced. Otherwise, the pressure on the substrate will be high. For good heat transfer effect, the temperature difference should be increased as much as possible to increase the external pressure of the substrate.
In order to extend the service life of the tubular oil cooler , maximize the use value of the product, and reduce the cost of the enterprise, when using the tubular oil cooler, we must pay attention to some of the above factors.
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