Marine Spare Parts: Heat Exchangers
Among various kind of marine spare parts, heat exchangers are necessary equipment which help maintain the temperature during a physical and chemical change. Since a range of these reactions occur in the engine room of a marine vessel, a heat exchanger is one of the most significant machinery on board.
A particular ship may have any of the different heat exchangers that are available for marine vessels. The specific type of heat exchanger used depends on the particular usage and requirements.
Marine heat exchangers belong to one of the four types: shell and tube, plate, plate fin, and dynamic scrapped surface heat exchanger. These are defined mainly by their construction. Let’s review them briefly:
1. Shell and tube type
It is a popular type of heat exchanger design which is equipped with a shell. This shell has several tubes from which the liquid to be cooled flows through. On the other hand, the secondary fluid flows over tubes inside the shell.
These are easy to clean and offer an affordable installation. However, these exchangers require frequent maintenance in comparison to other heat exchangers.
2. Plate type
Instead of tubes, these heat exchangers consist of corrugated, thin plates. These plates are joined in a parallel fashion, forming a cavity which allows the liquid to flow inside.
The two alternate sides of these plates carry different liquids. Heat transfer is carried out among these two fluids.
As an experienced marine spare parts provider, we understand it has a number of advantages, including negligible heat loss, less overall weight, fits in lesser space, lower maintenance cost, high heat transfer coefficient and easy installation. Efficiency is higher than shell and tube type for the same size of unit
3. Plate fin type
It is constructed in a manner similar to plate fin heat exchanger. The only difference is that it also contains fins in order to increase the system’s efficiency.
Aluminum alloy is used for higher heat transfer efficiency. This also lowers the weight of the system. Offset fins are set perpendicular to the direction of flow, while straight fins are parallel to the flow of fluid.
While efficiency of these units may be slightly higher in some cases, both maintenance and installation cost are comparatively higher.
4. Dynamic scrapped surface type
Longer running time is achieved in these types of heat exchangers because of continuous scrapping of the surface. This allows better heat transfer efficiency and reduces fouling of the system.
Scrapping is done in the exchanger by a blade unit. This is operated with a motor driven shaft which has a timer inside the frame. These are most often used for viscous fluids as it increases the turbulence of the liquid, positively affecting heat transfer.
We have a range of ship spare parts of various machines and equipment, including heat exchangers. As marine spare parts service providers, we offer custom made equipment too.