View in EDS HTML Full Text PDF Full Text

Performance testing of a baffled duct at different air attack angles based on entropy generation and exergy analysis.

Saved in:
Bibliographic Details
Title: Performance testing of a baffled duct at different air attack angles based on entropy generation and exergy analysis.
Authors: Pandey, Rajeev1 (AUTHOR) rajeevpandey74ster@gmail.com
Source: Experimental Heat Transfer. 2026, Vol. 39 Issue 3, p243-268. 26p.
Subject Terms: *Exergy, *Heat transfer, *Solar collectors, *Nonequilibrium thermodynamics, *Fluid flow
Abstract: Solar air collectors (SACs) with efficient heat transfer designs are a sustainable solution for space heating, reducing energy use and pollution. This study examines the entropy generation and exergetic performance of a SAC duct featuring elongated racetrack-shaped perforated V-baffles on its heat-absorbing surface, comparing its performance to that of a smooth-surface absorber. Experiments conducted encompass varying the baffles' geometric parameters like air attack angle (α) at 45°, 60°, 120°, and 135°; pitch ratio (p/e) at 2, 6, and 10; and perforation ratio (θ) at 0.27 and 0.29 with flow Reynolds number (Re) adjusted between 5400 and 14,400. The study analyses heat transfer and fluid flow losses using entropy generation numbers and exergy efficiencies as performance indicators. Baffles with α = 135° and θ = 0.29 achieve the lowest range of ${{\rm{N}}_{\rm{A}}}$ N A (augmentation entropy generation number), with a minimum value of 0.476 at a p/e of 2 and Re = 10,351. Similarly, baffles with α = 135° and θ = 0.27 achieve the highest ${{\rm{\eta }}_{{\rm{ex}}}}$ η ex (exergy efficiency), with a maximum value of 0.1319 (13.19%) at a p/e of 2 and Re = 8,731. Correlations for ${{\rm{\eta }}_{{\rm{ex}}}}$ η ex , developed using R software, show a close alignment between experimental and predicted values. [ABSTRACT FROM AUTHOR]
Database: Energy & Power Source
Full text is not displayed to guests.
FullText Links:
  – Type: pdflink
Text:
  Availability: 1
Header DbId: enr
DbLabel: Energy & Power Source
An: 192006686
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
PreciseRelevancyScore: 0
IllustrationInfo
Items – Name: Title
  Label: Title
  Group: Ti
  Data: Performance testing of a baffled duct at different air attack angles based on entropy generation and exergy analysis.
– Name: Author
  Label: Authors
  Group: Au
  Data: <searchLink fieldCode="AR" term="%22Pandey%2C+Rajeev%22">Pandey, Rajeev</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> rajeevpandey74ster@gmail.com</i>
– Name: TitleSource
  Label: Source
  Group: Src
  Data: <searchLink fieldCode="JN" term="%22Experimental+Heat+Transfer%22">Experimental Heat Transfer</searchLink>. 2026, Vol. 39 Issue 3, p243-268. 26p.
– Name: Subject
  Label: Subject Terms
  Group: Su
  Data: *<searchLink fieldCode="DE" term="%22Exergy%22">Exergy</searchLink><br />*<searchLink fieldCode="DE" term="%22Heat+transfer%22">Heat transfer</searchLink><br />*<searchLink fieldCode="DE" term="%22Solar+collectors%22">Solar collectors</searchLink><br />*<searchLink fieldCode="DE" term="%22Nonequilibrium+thermodynamics%22">Nonequilibrium thermodynamics</searchLink><br />*<searchLink fieldCode="DE" term="%22Fluid+flow%22">Fluid flow</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: Solar air collectors (SACs) with efficient heat transfer designs are a sustainable solution for space heating, reducing energy use and pollution. This study examines the entropy generation and exergetic performance of a SAC duct featuring elongated racetrack-shaped perforated V-baffles on its heat-absorbing surface, comparing its performance to that of a smooth-surface absorber. Experiments conducted encompass varying the baffles' geometric parameters like air attack angle (α) at 45°, 60°, 120°, and 135°; pitch ratio (p/e) at 2, 6, and 10; and perforation ratio (θ) at 0.27 and 0.29 with flow Reynolds number (Re) adjusted between 5400 and 14,400. The study analyses heat transfer and fluid flow losses using entropy generation numbers and exergy efficiencies as performance indicators. Baffles with α = 135° and θ = 0.29 achieve the lowest range of ${{\rm{N}}_{\rm{A}}}$ N A (augmentation entropy generation number), with a minimum value of 0.476 at a p/e of 2 and Re = 10,351. Similarly, baffles with α = 135° and θ = 0.27 achieve the highest ${{\rm{\eta }}_{{\rm{ex}}}}$ η ex (exergy efficiency), with a maximum value of 0.1319 (13.19%) at a p/e of 2 and Re = 8,731. Correlations for ${{\rm{\eta }}_{{\rm{ex}}}}$ η ex , developed using R software, show a close alignment between experimental and predicted values. [ABSTRACT FROM AUTHOR]
PLink https://search.ebscohost.com/login.aspx?direct=true&site=eds-live&db=enr&AN=192006686
RecordInfo BibRecord:
  BibEntity:
    Identifiers:
      – Type: doi
        Value: 10.1080/08916152.2025.2501525
    Languages:
      – Code: eng
        Text: English
    PhysicalDescription:
      Pagination:
        PageCount: 26
        StartPage: 243
    Subjects:
      – SubjectFull: Exergy
        Type: general
      – SubjectFull: Heat transfer
        Type: general
      – SubjectFull: Solar collectors
        Type: general
      – SubjectFull: Nonequilibrium thermodynamics
        Type: general
      – SubjectFull: Fluid flow
        Type: general
    Titles:
      – TitleFull: Performance testing of a baffled duct at different air attack angles based on entropy generation and exergy analysis.
        Type: main
  BibRelationships:
    HasContributorRelationships:
      – PersonEntity:
          Name:
            NameFull: Pandey, Rajeev
    IsPartOfRelationships:
      – BibEntity:
          Dates:
            – D: 01
              M: 05
              Text: 2026
              Type: published
              Y: 2026
          Identifiers:
            – Type: issn-print
              Value: 08916152
          Numbering:
            – Type: volume
              Value: 39
            – Type: issue
              Value: 3
          Titles:
            – TitleFull: Experimental Heat Transfer
              Type: main
ResultId 1