What is the key to solving the heat dissipation problem of the condenser

What is the key to solving the heat dissipation problem of the condenser

In the field of medical equipment, no matter what kind of equipment, users should pay attention to the maintenance and maintenance of each part after using it for a period of time. Taking the ultra-low temperature refrigerator as an example, the scale problem of the shell-and-tube condenser is particularly important.

　　 It is understood that scale, commonly known as "scale", refers to crystals formed by the continuous adhesion and accumulation of impurities in natural water. Its thermal conductivity is very poor, which easily affects the heat dissipation of the equipment, so in order to prolong the service life of the ultra-low temperature refrigerator, the scale on the surface of the shell and tube condenser must be removed in time.

　　So, what are the methods for removing scale from the shell-and-tube cooler? The industry introduced three methods: mechanical descaling, chemical pickling descaling, and electronic magnetic water heater descaling. Below, the editor will introduce the principles and scope of application of these methods for descaling.

　　Mechanical descaling

　　The mechanical descaling method of the shell and tube cooler is a method of descaling the condenser of the cooling tube using a flexible shaft tube washer, which is especially suitable for vertical shell and tube condensers.

The specific operation is to first extract the refrigerant in the condenser, then close all the valves connected to the condenser and the refrigeration system to ensure the normal supply of cooling water to the condenser, and then use the bevel gear-shaped scraper connected with the flexible shaft tube washer The vertical tube of the condenser is rotated and scraped from top to bottom to remove the scale, and the heat generated by the friction between the scraper and the tube wall is cooled by circulating cooling water, and the removed scale, rust and other dirt are flushed into the pool.

　　The industry reminds that when cleaning the shell-and-tube condenser of an ultra-low temperature refrigerator, care should be taken to prevent damage to the tube wall to avoid malfunction of the ultra-low temperature refrigerator.

　　Chemical pickling and descaling method

　　 Chemical pickling descaling method is to use a prepared weak acid descaling agent to clean the ultra-low temperature condenser of the low-temperature refrigerator, so that the scale will fall off, thereby improving the heat transfer efficiency of the condenser. The chemical pickling and descaling method is suitable for vertical and horizontal shell and tube condensers.

The main steps are: first prepare the descaling solution in the pickling tank, start the pickling pump, make the descaling solution circulate in the condenser tube of the condenser for 24 hours, stop the pickling pump, and then use the circular shape The steel brush is pulled back and forth in the tube wall of the condenser tube, and the scale and rust are rinsed with clean water, and then the descaler solution remaining in the tube is repeatedly washed with clean water until it is completely clean.

　　 electronic magnetic water descaling method

　　 Ultra-low temperature refrigerators can remove the scale of the shell and tube condenser in addition to the above two methods, as well as the electronic magnetic water descaling method.

According to reports, the electronic magnetic water descaling method is to dissolve calcium, magnesium and other salts in the cooling water of the condenser in the state of positive and negative ions at room temperature, thereby effectively preventing the generation of new scale and removing the original Some scale. At the same time, due to the different expansion coefficients of the steel pipe and the scale in the condenser, the original scale gradually cracks, and the magnetized water continuously penetrates into the cracks, destroying the adhesion of the original scale, making it gradually loose and spontaneous. It falls off and is constantly taken away by circulating cooling water.

　　 In short, once the condenser of the ultra-low temperature refrigerator has scale, its thermal resistance will continue to increase, resulting in a continuous decrease in the heat transfer coefficient value, making the cooling effect worse and worse. Therefore, it is recommended that once the operator finds that the condenser has scale, it should be checked and removed in time.