The article studies the effect of the number of passes in a shell and tubes condenser heat exchanger, with an entrance pressure of R134a refrigerant in the shell equal to 1.2 Mpa, utilising the concepts of efficiency and effectiveness. The tubes are filled with water or a water-based nanofluid containing a proportion of aluminium oxide nanoparticles (Al2O3). The methods utilised divide the heat exchanger into three sections: overheated, saturated, and subcooled. The major metrics used to evaluate the heat exchanger’s thermal performance were efficiency and effectiveness. The efficiency of superheated steam is close to 1.0. However, there is room for improvement in terms of thermal efficiency, which can be enhanced by additional tube passes. For lower mass flow rates of the fluid in the tube, the saturated steam region approach is effective, but for higher mass flow rates of the fluid in the tube, it is inefficient. Despite this, it is highly effective at high mass flow rates. There is lots of room to enhance efficiency in the subcooled area. Even yet, the fluid inlet temperature in the pipe and the work refrigerant pressure limit more heat exchange in the subcooled area.
Department of Mechanical and Energy of State University of Rio de Janeiro FAT/UERJ, Resende, Brazil.
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