18-07-2012, 03:22 PM
Heat Exchanger
Heat Exchanger.docx (Size: 192.05 KB / Downloads: 149)
INTRODUCTION
A heat exchanger is a piece of equipment built for efficient heat transfer from one medium to another. The media may be separated by a solid wall, so that they never mix, or they may be in direct contact. A heat exchanger is a device that is used for transfer of thermal energy (enthalpy) between two or more fluids, between a solid surface and a fluid, or between solid particulates and a fluid, at differing temperatures and in thermal contact, usually without external heat and work interactions. The fluids may be single compounds or mixtures.
Typical applications involve heating or cooling of a fluid stream of concern, evaporation or condensation of a single or multi component fluid stream, and heat recovery or heat rejection from a system. In other applications, the objective may be to sterilize, pasteurize, fractionate, distill, concentrate, crystallize, or control process fluid. In some heat exchangers, the fluids exchanging heat are in direct contact. In other heat exchangers, heat transfer between fluids takes place through a separating wall or into and out of a wall in a transient manner.In most heat exchangers, the fluids are separated by a heat transfer surface, and ideally they do not mix. Such exchangers are referred to as the direct transfer type, or simply recuperate.
SHELL AND TUBE TYPE HEAT EXCHANGER
Shell and tube heat exchangers are the most versatile type of heat exchangers. They are used in process industries, in conventional and nuclear power stations as condensers, in steam generators in pressurized water reactor power plants, in feed water heater, and some air conditioning and refrigeration system. They are also proposed for many alternative energy application including ocean, thermal geo-thermal
Shell and tube heat exbhanger provide relatively large ratio of heat transfer area to volume and weight they can easily clean.
Shell and tube heat exchanger offer a great flexibility to meet almost any service requirement. The reliable design methods and shop facilities are available for their successful design and construction. Shell and tube heat exchanger can be designed for high pressure relative to the environment and high pressure difference between the fluid stream.
Basic Components
Shell and tube heat exchanger are build of round tubes mounted in cylindrical shell with the tube parallel to the shell one fluid flows inside the tubes, while the other fluids flows across and along the axis of exchanger. The major component of heat exchanger are tubes (tube bundle), shell, front-end head same rear-end head, baffles and tube sheets. Typical parts and connections are shown in the figure.
Heat Exchanger.docx (Size: 192.05 KB / Downloads: 149)
INTRODUCTION
A heat exchanger is a piece of equipment built for efficient heat transfer from one medium to another. The media may be separated by a solid wall, so that they never mix, or they may be in direct contact. A heat exchanger is a device that is used for transfer of thermal energy (enthalpy) between two or more fluids, between a solid surface and a fluid, or between solid particulates and a fluid, at differing temperatures and in thermal contact, usually without external heat and work interactions. The fluids may be single compounds or mixtures.
Typical applications involve heating or cooling of a fluid stream of concern, evaporation or condensation of a single or multi component fluid stream, and heat recovery or heat rejection from a system. In other applications, the objective may be to sterilize, pasteurize, fractionate, distill, concentrate, crystallize, or control process fluid. In some heat exchangers, the fluids exchanging heat are in direct contact. In other heat exchangers, heat transfer between fluids takes place through a separating wall or into and out of a wall in a transient manner.In most heat exchangers, the fluids are separated by a heat transfer surface, and ideally they do not mix. Such exchangers are referred to as the direct transfer type, or simply recuperate.
SHELL AND TUBE TYPE HEAT EXCHANGER
Shell and tube heat exchangers are the most versatile type of heat exchangers. They are used in process industries, in conventional and nuclear power stations as condensers, in steam generators in pressurized water reactor power plants, in feed water heater, and some air conditioning and refrigeration system. They are also proposed for many alternative energy application including ocean, thermal geo-thermal
Shell and tube heat exbhanger provide relatively large ratio of heat transfer area to volume and weight they can easily clean.
Shell and tube heat exchanger offer a great flexibility to meet almost any service requirement. The reliable design methods and shop facilities are available for their successful design and construction. Shell and tube heat exchanger can be designed for high pressure relative to the environment and high pressure difference between the fluid stream.
Basic Components
Shell and tube heat exchanger are build of round tubes mounted in cylindrical shell with the tube parallel to the shell one fluid flows inside the tubes, while the other fluids flows across and along the axis of exchanger. The major component of heat exchanger are tubes (tube bundle), shell, front-end head same rear-end head, baffles and tube sheets. Typical parts and connections are shown in the figure.