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Research Papers

Design and Construction of an Air Cooled Ammonia Absorber

[+] Author and Article Information
Nicolás Velázquez1

Instituto de Ingeniería, Universidad Autónoma de Baja California, Calle de la Normal s/n, Col. Insurgentes Este, Mexicali, Baja California 21280, Méxiconicolasvelazquez@iing.mxl.uabc.mx

Daniel Sauceda, Margarito Quintero-Núñez

Instituto de Ingeniería, Universidad Autónoma de Baja California, Calle de la Normal s/n, Col. Insurgentes Este, Mexicali, Baja California 21280, México

Roberto Best

Centro de Investigación en Energía, Universidad Nacional Autónoma de México, Privada Xochicalco s/n, Centro, Temixco, Morelos 62580, Méxicorbb@cie.unam.mx

1

Corresponding author.

J. Sol. Energy Eng 131(2), 021006 (Mar 25, 2009) (7 pages) doi:10.1115/1.3097273 History: Received May 08, 2007; Revised January 24, 2009; Published March 25, 2009

This paper presents the design criteria, methodology. and results of the basic and detailed engineering for a descending film ammonia absorber using air cooled finned tubes, which is part of an advanced absorption cooling system (solar generator absorber heat exchange cycle). The design consists in determining all the construction parameters for the air cooled ammonia absorption unit, starting with the operating conditions defined by a thermodynamical simulation of the process considering both physical and operational design restrictions. The chosen option was based on a comparison between the advantages and disadvantages of each possible array, type, and geometry. After performing the operational simulation, thermal and mechanical designs, and the consistency analysis, it was found that an absorption unit using 29 5/8 NPT 14 (BWG) steel carbon ASTM A-179 tubes, with pure SB-234 aluminum fins was the best option. The tubes are arranged in an equilateral triangle fashion, with crossed air flow cooling.

Copyright © 2009 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Technology research and development project stages (green technology development)

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Figure 2

Solar GAX absorption system

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Figure 3

General design procedure

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Figure 4

Radial temperature concentration profiles: (a) absorption section, (b) generation section, and (c) GAX unit

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Figure 5

Behavior of the heat transfer coefficients and efficiencies with varying the tubes lengths

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Figure 6

Behavior of the absorber decision parameters by changing the tube length

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Figure 7

Behavior of the heat transfer coefficients and efficiencies by changing the fined tube spacing

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Figure 8

Behavior of the decision parameters by changing the fined tube spacing

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Figure 9

Behavior of the heat transfer coefficients by changing the diameter of the tubes

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Figure 10

Behavior of the absorber decision parameters by changing the diameter of the tubes

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Figure 11

Finned tubes characteristics

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Figure 12

Absorber mirror, baffle, tube bundle, and air inlet-outlet

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Figure 13

Absorber-GAX column

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Figure 14

Fan-absorber coupling (inducted shaft)

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Figure 15

Air cooled falling film absorber

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