Cooling plate

High heat transfer coefficient Because different corrugated plates are inverted, forming a complex flow passage, the fluid in the flow passage between corrugated plates presents a rotating three-dimensional flow, which can produce turbulence at a low Reynolds number (generally Re=50~200), so the heat transfer coefficient is high, which is generally considered to be 3~5 times that of the shell and tube type.

two

The logarithmic average temperature difference is large, and the end temperature difference is small. In the shell and tube heat exchanger, the two fluids flow in the tube side and shell side respectively, which are cross flow in general. The logarithmic average temperature difference correction coefficient is small, while the plate heat exchanger is mostly parallel flow or countercurrent flow, and its correction coefficient is usually about 0.95. In addition, the flow of cold and hot fluids in the plate heat exchanger is parallel to the heat exchange surface, without side flow, so the end temperature difference of the plate heat exchanger is small, Water heat exchange can be lower than 1 ℃, while shell and tube heat exchanger is generally 5 ℃

three

The floor space of small plate heat exchanger is compact, and the heat exchange area per unit volume is 2~5 times that of the shell and tube type. It is also different from the shell and tube type in that it needs to reserve a maintenance place for extracting tube bundles, so the same heat exchange can be achieved. The floor space of plate heat exchanger is about 1/5~1/10 of that of shell and tube heat exchanger.

four

It is easy to change the heat exchange area or process combination as long as it is increased or decreased.