Transfer heat between fluids; parallel and counterflow arrangements.
Heat exchangers transfer heat between fluids without mixing: shell-and-tube, plate, finned tube, double-pipe. Flow arrangements: parallel, counterflow (most effective), cross-flow. Q=UAΔT_lm. Fouling adds resistance; pressure drop determines pumping power.
A car radiator is a cross-flow finned-tube exchanger.
Heat exchangers transfer heat between fluids without mixing them, so they are needed in nearly every process, power plant and HVAC system.
Transfer heat between fluids; parallel and counterflow arrangements.
Heat exchangers transfer heat between fluids without mixing them, so they are needed in nearly every process, power plant and HVAC system.
In counterflow the outlet of the cold fluid can approach the inlet temperature of the hot fluid, which gives higher effectiveness.
Counterflow gives the greatest temperature driving force along the length, so it transfers more heat for the same area.
Typical applications include designing a shell-and-tube exchanger to preheat feedwater, choosing a plate heat exchanger for a food process and specifying an intercooler for a compressor with counterflow.
Study "Transient conduction" first (topic 92 of 105 in Thermodynamics & Fluids). It covers the groundwork this topic builds on.
Overall U. Effectiveness. Compact designs for gases.
A car radiator is a cross-flow finned-tube exchanger.
The next topic is "LMTD and NTU methods", which builds directly on this one.
It is classed as Advanced in Thermodynamics & Fluids (topic 93 of 105). It is an advanced topic. It assumes you are comfortable with the intermediate topics in Thermodynamics & Fluids.
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