Enhancing Air Side Heat Transfer Coefficient of Flat Tube Air Cooled Condensers.

Document Type : Research Studies

Authors

1 Faculty of Engineering Mansoura University., Mansoura., Egypt

2 Mechanical Eng. Dept., Higher Technological Institute, Tenth of Ramadan City, Egypt.

3 Department of Mechanical Power Engineering, Mansoura University, Mansoura, Egypt

4 Faculty of Engineering Mansoura University., Mansoura., Egypt.

5 Higher Technological Institute, Tenth of Ramadan City, Egypt

Abstract

Forced convection heat transfer for air side over aluminum extruded micro-channel fat tubes, which used in air cooled condensers, was studied theoretically. Mathematical modeling of air flow outside the aluminum flat tubes were carried out to study the proposed inclination angles and evaluate the thermal performance for different operating parameters. A computational fluid dynamic software (CFD) is used to solve this problem. Two proposed cases for inclination of the flat tubes are studied. The first case is to make convergent and divergent channels for air Now, while the second case is tilting of all tubes in parallel to each other. Inclination for the flat tubes by a certain angle improves the convection side and in turn improves the overall thermal performance of the air cooled condenser. The theoretical results show that the optimum angle for the proposed two cases was about 4° with corresponding aspect ratio of 0.58. This leads to enhancement the heat transfer coefficient by factor (Kh) of 1.469 and 1.46 against increase in pressure drop factor (KP) of 2.12 and 1.95 for case-land cusc-2, respectively. 

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