what is the mechanism involve in a heat exchanger???Can someone tell me?Thx?
It is not really a mechanism. Hot liquid or air is passed through a radiator, on the other side of which is cool liquid or air. The hot side loses heat while the cool side gains heat, due to natural conductivity of heat. Given enough contact time, the hot and cool sides will both exit at very close to the same temperature. THus, heat has been exchanged from the hot side to the cool side.
A heat exchanger normally conveys heat from a fluid at one temperature into another fluid at a lower temperature. The fluids are separated by a barrier, which is thin but large in area so as to transport heat with good efficiency. Examples include a furnace for domestic heat, and the condensing coils and evaporating coils in a refrigerator.
*I think you mean how different types of heat exchangers works. -A heat exchanger can be used for cooling,heating[no phase change] or condensing,evaporating [phase change]. -A heat exchanger is a device built for efficient heat transfer from one fluid to another, whether the fluids are separated by a solid wall so that they never mix, or the fluids are directly contacted.They are widely used in petroleum refineries, chemical plants, petrochemical plants, natural gas processing, refrigeration, power plants, air conditioning and space heating.
