HEAT EXCHANGERS
What is heat Transfer:-
Heat Transfer is the transition of thermal energy from a hotter object to a cooler object.
Heat Transfer done from a hot or warm area to a cold medium in 3 ways:
By radiation from a warm surface to a cooler surface through air space
By conduction through solisolid or fluid materials
By convection which involves the physical movement of air
Basics for heat Transfer are:-
Difference in temperature between the hot and cold fluids, greater the difference-higher the rate at which the heat will flow between them.
area of the conductive barrier provided for heat flow. The greater the area, the larger the amount of heat that will flow in a given time with a given temperature difference.
rate of heat flow into,or,out, from each of the fluids. High high resistance to heat flow in either fluid will produce a slow overall rate of Transfer.
flow of heat through the conductive barrier between fluids. Material chosen has to be compatible with the fluids of the process, it most not corrode or contaminate the fluids.
What is Heat Exchangers:-
A heat exchanger is a device which allows Transfer of heat energy from one fluid to another fluid,generally without mixing the two different fluid. Regardless of the operate that a device fulfills,to Transfer heat,the fluids concerned should be at totally different temperatures and that they should acquire thermal contact, since heat will flow only from the hot to the cool liquid.
A heat exchanger can serve any of the following purposes.
1. To heat a cooler fluid by means of a hotter fluid
2. To reduce the temperature of a hot fluid by means of a cooler fluid
3. To boil liquid by means of a hotter fluid
4. To condense a gaseous fluid by means of a cooler fluid
5. To boil a liquid while condensing a hotter gaseous fluid
Heat Transfer in a heat Exchangers is calculated by the following formula:-
Q= m× Cp × dT
Where,
Q= Heat transfer
m= mass flow rate of fluid
Cp= Specific Heat of the fluid
dT= Temperature difference between Inlet and outlet of the fluid
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