Two different fluids with two different temperatures flow through the heat exchanger, one flows through the inner pipes and the other through the large pipe (sleeve) on the outside.Heat is transferred from one fluid to another. Newton’s heat transfer laws are used.The method of heat transfer between fluids can be used in planty of applications. It’s mostly used in the heating system of modern buildings. This ensures the recovery of energy. For example, the steam from the use of a steam-using plant can be used as a heater of hot water of the plant by means of plate heat exchangers. The working principle of the plate heat exchanger is basically the same but there may be a variety of pipe and hive designs. There is a different design required for the reaching a desired fluid temperature for increasing or decreasing the temperature. Mostly used pass designs are 1, 2 or 4.
These numbers determine how the pipes and fluid paths will pass through the hive. In single-pass heat exchangers, the fluid enters one side and exits the other. Two or four-pass designs are considered as often used designs because the fluid can enter and exit from the same side. This makes the construction simple and therefore, the yield is comes higher. The general idea in the design of a heat exchanger is the use of ducts or similar profiles for heat transfer from one cold or hot liquid to another. The working principle of the plate heat exchanger consists, in summary, of a closed chamber through which pipes, including pipes and other fluid paths, circulate, allowing a liquid to circulate in the other without mixing. Pipe walls should generally be made of stainless steel. The transition of thermal heat from another material having high conductivity capacity to the outer closed chamber is provided. It is made of plastic or other material with high heat capacity that will not dissipate heat from the heat exchanger. The plate heat exchanger is the development of this simple design to increase the heat transfer rate.
Working principle of plate heat exchanger; There are two baffles in place of the pipes running through the closed baffle. Generally, their depth is small. Each compartment was thinned to assist in contacting the volume of the liquid with the plate. The plate is designed with a large surface area to provide the fastest transfer.
So the principle of plate heat exchanger working is – The fluids flowing through the flow channels on the plates flow through the gaskets without being mixed with each other and the desired heat transfer is carried out due to the temperature difference.
The flow directions on the plates allow the flow to flow in a turbulent manner, supporting the formation of high heat transfer coefficients.