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206145

Thermal and Hydraulic Analysis for Air Flow Across Flat Tubes Air Cooled Condensers.

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Last updated: 04 Jan 2025

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-

Tags

Mechanical Power Engineering

Abstract

Thermal and hydraulic analysis is performed theoretically for air flow across flat tubes which used in air cooled condensers. Simultaneous forced convection of air outside condenser tubes and condensation of refrigerant inside it takes place. Many cros section configurations of flat tubes has been studied and compared with circular tube, for both equal perimeter (case-1) and for equal cross sectional area (case-2). The effect of tube spacing to height of flat tube (s/a) and the ratio between breadth to height of flat tube section (m-b/a) on the tube performance  (rate of heat transfer and pressure  drop for air side) is investigated theoreticaly to get the best effect cross section shape for each one of the proposed two cases. This study is based on equilateral triangle staggering configuration for both of circular and flat tube arrangements. A computational fluid dynamic software (CFD0 commercial package (FLUENT 6.0) is applied to flat tubes to study and evaluate the proposed two cases and compared with circular tube.
The obtained theoretical results showed that the bet effect tube spacing (s/a) equal to 2 for case-1, and case -2 to achieve high performance for flat tubes. Also the best effect cross section has m = 4 for case-1 and m-8 for case-2. This leads to enhancement of outside air heat transfer rate by factor (KQ) of about 1.5 and 2.1 against increase in pressure drop factor (K∆p < /sub>) of about 1.7 and 3.3 for case-1 and case-2 respectively. Also, for the same volume of heat exchangers the enhancement factor of outside air heat transfer rate (KQ) is about 3.15 and 3.35 for case-1 and case -2.respectively at the best values of s/a and m for the studied two cases. In the same time, for condensation of refrigerant inside tubes for the same mass flow rate of refrigerant (KQ/m.)  is about 1.2 and 2.2 for case-1 and case-1 and case-2 respectively.

DOI

10.21608/bfemu.2021.206145

Keywords

Air cooled condenser, Flat tubes, enhancing heat transfer

Authors

First Name

M.

Last Name

Awad

MiddleName

M.

Affiliation

Mechanical Power Engineering Department, Faculty of Engineering, Mansoura University, Egypt.

Email

-

City

Mansoura

Orcid

-

First Name

H.

Last Name

Mostafa

MiddleName

M.

Affiliation

Higher Technological Institute, Tenth of Ramadan City, Egypt.

Email

-

City

Tenth of Ramadan

Orcid

-

First Name

A.

Last Name

El-Booz

MiddleName

-

Affiliation

Mechanical Power Engineering Department, Faculty of Engineering, Mansoura University, Egypt.

Email

-

City

Mansoura

Orcid

-

First Name

A.

Last Name

El-Ghonemy

MiddleName

M.K.

Affiliation

Higher Technological Institute, Tenth of Ramadan City, Egypt.

Email

amghonemy@yahoo.com

City

Tenth of Ramadan

Orcid

-

Volume

32

Article Issue

4

Related Issue

19078

Issue Date

2007-12-01

Receive Date

2007-10-09

Publish Date

2021-11-23

Page Start

30

Page End

42

Print ISSN

1110-0923

Online ISSN

2735-4202

Link

https://bfemu.journals.ekb.eg/article_206145.html

Detail API

https://bfemu.journals.ekb.eg/service?article_code=206145

Order

17

Type

Research Studies

Type Code

1,205

Publication Type

Journal

Publication Title

MEJ. Mansoura Engineering Journal

Publication Link

https://bfemu.journals.ekb.eg/

MainTitle

Thermal and Hydraulic Analysis for Air Flow Across Flat Tubes Air Cooled Condensers.

Details

Type

Article

Created At

22 Jan 2023