A shell and tube heat exchanger is a type of heat exchanger that is commonly used for heating, cooling and condensing applications. lt consists of a shell with an internal bundle of tubes,which allows the hot and cold fluids to pass through the walls of the exchanger and exchange their energy. Shell and tube exchangers are classified in several ways, including design, operational construct, and construction materials. Mainly Fixed Tube Heat Exchanger, Floating Head Heat Exchanger, U-tube Heat Exchanger, and double tube heat exchanger.
The working principle of a shell and tube heat exchanger is relatively simple. The system is designed with two separate flows on either side of the heat exchanger. The primary flow of the hot fluid passes through the tubes, while the secondary flow of the cold fluid passes through the spaces between the tubes. Heat is then transferred from the hot side to the cold side via conduction, leading to an exchange of temperatures.
Shell and tube heat exchangers are normally used in process plants and used in a wide range of applications. A case in point is the cooling of condensates in refineries and nuclear power plants. In this application, condensate is heated using an external source and passed through the tube section of the heat exchanger. This condensate is then cooled and condensed as it passes through the shell side, where the heat is transferred to a cooling medium such as water, steam or oil.
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A few days ago, Volkswagen introduced a pure electric light commercial vehicle, transport and logistics research project, eT Concept. This light commercial vehicle can become a future mail and parcel delivery vehicle, and it can also achieve zero emissions. 
It is understood that the eT Concept light commercial vehicle has a semi-autonomous driving function. The driver can make eT through the instructions of "Follow me-" and "Come to me- come here." Concept follows the driver's door-to-door delivery of packaged goods. In addition, the driver can also drive the car from the co-pilot through a “driving leverâ€. The co-pilot seat is designed to be standable, allowing the occupants to quickly enter the car. 
The power source of eT Concept is provided by electric motors installed in four rims, which can expand the vehicle room space to the maximum. Front and rear doors of Volkswagen eT Concept adopt electric sliding design. This design is not only safer, but also allows delivery drivers to open and unload cargoes in places where there is not much space.