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Starting from the differential equations that describe heat transfer, several "simple" correlations between effectiveness and NTU can be made. [2] For brevity, below summarizes the Effectiveness-NTU correlations for some of the most common flow configurations: For example, the effectiveness of a parallel flow heat exchanger is calculated with:
Tubular heat exchanger Partial view into inlet plenum of shell and tube heat exchanger of a refrigerant based chiller for providing air-conditioning to a building. A heat exchanger is a system used to transfer heat between a source and a working fluid. Heat exchangers are used in both cooling and heating processes. [1]
Cocurrent and countercurrent heat exchange. A cocurrent heat exchanger is an example of a cocurrent flow exchange mechanism. Two tubes have a liquid flowing in the same direction. One starts off hot at 60 °C (140 °F), the second cold at 20 °C (68 °F). A thermoconductive membrane or an open section allows heat transfer between the two flows.
In parallel flow, fluids enter the heat exchanger through their tubes, and the fluids flow in the same direction. In counterflow, the fluids flow in opposing directions. Counterflow provides the most efficient transfer of heat, as it is able to transfer the most heat from the heat transfer medium.
Heat transfer is a discipline of thermal engineering that concerns the generation, use, conversion, and exchange of thermal energy between physical systems. Heat transfer is classified into various mechanisms, such as thermal conduction, thermal convection, thermal radiation, and transfer of energy by phase changes.
Types of recuperator, or cross plate heat exchanger. A recuperator (electro- end carbogidro-) - is a special purpose counter-flow energy recovery heat exchanger positioned within the supply and exhaust air streams of an air handling system, or in the exhaust gases of an industrial process, in order to recover the waste heat. Generally, they are ...