Heat is transferred from hot and cold fluid through a solid wall, in which their flow is controlled and allowed to pass through in a specified path. The pieces of equipment which does this job is called a heat exchanger. It plays it role during the necessity of heat exchange and temperature control in a system or unit. In most case where ever energy is produced or control and even managed their will be a heat exchanger encryption with in its system. You can see a radiator in the car which acts as heat exchanger to absorb heat from the engine and release it to the atmosphere effectively.
The design of heat exchange equipment is based on the mass and energy balance done for surface area requirement to maintain the temperature at the outlets.
Based on the application the device range from few inches to some square foot, but the ultimate function of heat exchanger is to transfer a heat energy from one fluid to another without any additional means but by simple surface contact phenomenon. Mostly available type is double pipe heat exchanger, and come shell and tube heat exchanger and a plate and frame heat exchanger which are widely used for handling liquids. when coming to gas and vapor they take up a different category of heat exchangers. Heat exchange equipments PPT, you can find some simple theory of heat exchange process that happen in heat exchange equipments and determine the performance that helps in selection for particular application.
Heat transfer modes in heat exchange process:
An energy which eager to move from high temperature and to low temperature location is known by the name HEAT. This is well understood basic phenomena and the reason behind it are covered at the microscopic level of study, which involves the particle motion and its colliding nature, even state of existence in the surroundings. Heat when studied during the exchange or conversion their is wide difference in maintaining the concepts related because when heat converts to work then the concept goes into the scale of “Thermodynamics” and so a “Heat transfer” course narrowed down to the mechanisms on which heat will follow during the shift from high to low temperature difference. The driving force of temperature difference and the area of the material are two parameters considered from the physical quantities. where the one of the physical property of a material which is unique in nature, obtained from experiments called thermal conductivity is involved in the study of heat transfer. But these are used for one of the modes called Conduction and there other mode called as Convection and Radiation so some unique physical constant are derived for each mode.
Heat can use any mechanism separately or in combined form based on the situation demands. Their are even some more parameters and constant are available and only valid in our surrounding, with some good experimental correlation which can be used as standards in design the heat exchange devices and fired heaters. Heat transfer is studied not only to generate or exchange heat but also to control it as per our need. A major obstruction in design of these type of equipment is that the heat loss will determine the ultimate performance of the operation because if heat is lost than money is lost for nothing.