Whether you have a hot tub, saltwater, or chlorinated pool, you may need to use heat exchangers for pools to keep the water at the proper temperature. This type of heater uses hot water from a boiler, or a solar-heated water circuit, to heat the water. The heated water is then pumped back into the pool.
Shell and tube heat exchanger:
A shell and tube heat exchanger is usually made of many small tubes. These tubes are placed into a cylinder using a tube bundle. They are then anchored onto a fixed or floating tube plate. The tube bundle can be easily removed to make repairs or services. Some models can also feature a floating tube stack, which allows the tube bundle to expand with changes in heat conditions.
A shell and tube heat exchanger is also used in marine applications. This type of exchanger requires that the design consider the speed of the seawater flow. Sand and high-velocity water can block the tubes, causing the tube plate to wear away. In addition, saltwater corrosion is a problem in chlorinated pools.
Plate heat exchanger:
Another type of heat exchanger is the plate heat exchanger. This exchanger works similarly to the shell-and-tube model but has a different design. Typically, these exchangers are made from stainless steel or brazed. A loose pressure plate also holds them. This heat exchanger is used in various applications, including food processing and domestic hot water supply.
Air-cooled heat exchangers:
There are also air-cooled heat exchangers. These models have fins that pass cool air through them. They are much less expensive than traditional heat exchangers but still mechanically weak. On the other hand, plastic heat exchangers are light and can be used for everyday room-temperature applications.
You will need to install a heat exchanger made from corrosion-resistant materials for saltwater applications. The material must be able to withstand high temperatures and corrosive chemicals. Heat exchangers should also be installed so that the fluids flow counter-current. This means the coolant should flow left to right, and the hot fluid should flow right to the left.