Experimental evaluation of a new mini square channel air-cooled heat exchanger for an absorption chiller

被引:3
作者
Venegas, M. [1 ,2 ]
Ghatos, S. [3 ]
de Vega, M. [1 ]
Garcia-Hernando, N. [1 ]
机构
[1] Univ Carlos III Madrid, ISE Res Grp, Dept Thermal & Fluids Engn, Avda Univ 30, Madrid 28911, Spain
[2] Univ Carlos III Madrid, Dept Thermal & Fluids Engn, GTADS Res Grp, Avda Univ 30, Madrid 28911, Spain
[3] Mohammed V Univ Rabat, Res Ctr Ind & Hlth Sci & Technol, Lab Appl Mech & Technol, ENSIAS,ENSAM, Ave Armee Royale,BP 6207, Rabat, Morocco
关键词
Air-cooled subcooler; Square minichannels; Approach temperature; Pressure drop; Heat transfer coefficient; Absorption cooling system; PERFORMANCE; ABSORBER;
D O I
10.1016/j.ijheatmasstransfer.2022.123186
中图分类号
O414.1 [热力学];
学科分类号
摘要
A mini square channel air-cooled heat exchanger, operating as subcooler in the typical temperature range of absorption cooling systems, is experimentally evaluated. Working fluid flows along 82 square minichannels of 2 mm side and 11 cm length, manufactured on stainless-steel. Hot fluid flows downward through the channels and two cases are evaluated: natural and forced air convection. In the last case, ambient air flows in the upward direction. Two additional operating parameters are modified: the inlet fluid temperature, between 34.8 and 75.4 degrees C and the fluid mass flow rate, in the range from 5.7 to 29.1 kg/h. Inlet and outlet temperature and pressure for the fluid and ambient temperature are measured, while the air velocity is kept constant at 0.75 m/s. Results obtained for the approach temperature, pressure drops, heat transferred and heat transfer coefficients for the air-cooled subcooler are provided. Correlations are derived to predict the heat transfer coefficient and pressure drop of the subcooler. Integration of the air-cooled subcooler in a single-effect absorption cooling system is evaluated, showing a notable increase in the cooling power mainly in the case of using forced air flow. (C) 2022 Elsevier Ltd. All rights reserved.
引用
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页数:12
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