Advantages of plate heat exchangers

1. The startup and shutdown times required for plate heat exchangers are short, easy to operate, and are welcomed by operation managers.

2. When leakage occurs in plate heat exchangers, the medium inside the plate heat exchanger leaks onto the outer surface, unlike shell-and-tube heat exchangers where the primary and secondary water are intertwined, and under normal circumstances, it is not easily detected.

3. Depending on different loads, the number of circulating plates and travel can be combined, making panel assembly flexible. If a Zhongwen connector plate or intermediate partition is used, several heat exchangers can be installed on one bench to operate under different loads. This reduces the need for piping, valve fittings, and other equipment in the system, which helps lower project costs and floor space.

4. Plate heat exchangers have lighter dirt because there is a high end flow between the plates, causing contaminants to remain suspended. At this time, the plates act as smooth heat transfer surfaces. Even if dirt accumulates and hangs on the plate, there are no dead corners, so the surface is less likely to corrode. At this point, turbulence helps wash itself, washing away dirt on the attached plates and providing a stripping effect. At the same time, the space between panels is small, resulting in less medium retention, making cleaning simple and convenient.

5. The plate type is compact, so less heat is lost to the surrounding kitchen environment. According to relevant literature reports, the heat loss in the tubing is generally only about 1 t5. At the same time, plate-type heat exchangers occupy less space, only 1/5~1/10 of those of shell-and-tube heat extractors. Including maintenance and inspection of core-pulling tubes in shell-and-tube heat exchangers, this number is even smaller. Lightweight, and when carrying the same thermal load, The plate type weighs only about one-quarter that of the tube-and-tube type, which makes inspection, cleaning, and maintenance more convenient.

6. Plate heat exchangers with high heat transfer coefficient: There are mainly three types of textured surface plates. Raised plates, cross-shaped plates, and herringbone plates are the most commonly used in the heating field. At low flow velocities of 0.15~0.85 m/s, turbulent flow can be induced, and the heat transfer coefficient on both sides of the plate is very high. According to relevant data, when the Reynolds number of plate heat exchangers is greater than 50~200, the heat transfer coefficient for water-to-water is 15,000~21,000 K/㎡·h·°C, while for two-row tube types, it is only 3200~6300 K/m·h·°C. Data shows that the heat transfer coefficient of plate heat exchangers is 2~4 times that of shell-and-tube types, and the pressure drop is close at this time.

7. Plate heat exchangers have low thermal resistance due to fouling. The plates of plate heat exchangers are generally made of stainless steel plates, titanium plates, or other alloy steel plates, with a typical plate thickness gauge of 0. B~0.9mm. Due to the thin panel wall, the thermal resistance of the panel wall is reduced. Of course, this is also related to the strong turbulence generated by the plate castration, resulting in low thermal resistance from dirt on the heat exchanger surface. According to the standards of the American Tent Heat Exchanger Manufacturers Association (TEMA), the scale thermal resistance of T-plate heat exchangers can be selected as one-fifth of the internal fouling thermal resistance of shell-and-tube heat exchangers when using the same medium. Other literature also mentions that the thermal resistance of fouling in plate heat exchangers is generally about 0.00012 m·°C· htkcal。 When designed, when the medium is condensate or steam, the thermal resistance of fouling in plate heat exchangers is 0. O00001 m·°C·h/kcal, while the thermal resistance of fouling in shell-and-tube heat exchangers is 0.0001, so the ratio of the two is about 1:10.