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Thermal and effective efficiency based analysis of discrete V-down rib-roughened solar air heaters
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10.1063/1.3574430
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Affiliations:
1 Department of Mechanical Engineering, Dr. B.R. Ambedkar National Institute of Technology, Jalandhar, Punjab 144011, India
2 Department of Mechanical and Industrial Engineering, Indian Institute of Technology, Roorkee 247667, India
a) Author to whom correspondence should be addressed. Electronic mail: sukhmeet70@rediffmail.com. Tel.: +919465195252. Permanent address: School of Energy Studies for Agriculture, Punjab Agricultural University, Ludhiana, India.
J. Renewable Sustainable Energy 3, 023107 (2011)
/content/aip/journal/jrse/3/2/10.1063/1.3574430
http://aip.metastore.ingenta.com/content/aip/journal/jrse/3/2/10.1063/1.3574430

## Figures

FIG. 1.

Discrete V-down rib arrangement.

FIG. 2.

Flow chart of mathematical model.

FIG. 3.

Thermal efficiency as a function of Reynolds number and relative roughness pitch.

FIG. 4.

Thermal efficiency as a function of temperature rise parameter and relative roughness pitch.

FIG. 5.

Thermal efficiency as a function of Reynolds number and relative gap position.

FIG. 6.

Thermal efficiency as a function of temperature rise parameter and relative gap position.

FIG. 7.

Thermal efficiency as a function of Reynolds number and angle of attack.

FIG. 8.

Thermal efficiency as a function of temperature rise parameter and angle of attack.

FIG. 9.

Thermal efficiency as a function of Reynolds number and relative gap width.

FIG. 10.

Thermal efficiency as a function of temperature rise parameter and relative gap width.

FIG. 11.

Thermal efficiency as a function of Reynolds number and relative roughness height.

FIG. 12.

Thermal efficiency as a function of temperature rise parameter and relative roughness height.

FIG. 13.

Effective efficiency as a function of Reynolds number and relative roughness pitch.

FIG. 14.

Effective efficiency as a function of temperature rise parameter and relative roughness pitch.

FIG. 15.

Effective efficiency as a function of Reynolds number and relative gap position.

FIG. 16.

Effective efficiency as a function of temperature rise parameter and relative gap position.

FIG. 17.

Effective efficiency as a function of Reynolds number and angle of attack.

FIG. 18.

Effective efficiency as a function of temperature rise parameter and angle of attack.

FIG. 19.

Effective efficiency as a function of Reynolds number and relative gap width.

FIG. 20.

Effective efficiency as a function of temperature rise parameter and relative gap width.

FIG. 21.

Effective efficiency as a function of Reynolds number and relative roughness height.

FIG. 22.

Effective efficiency as a function of temperature rise parameter and relative roughness height.

FIG. 23.

Optimum values of relative roughness pitch on the basis of effective efficiency criterion.

FIG. 24.

Optimum values of relative gap position on the basis of effective efficiency criterion.

FIG. 25.

Optimum values of angle of attack on the basis of effective efficiency criterion.

FIG. 26.

Optimum values of relative gap width on the basis of effective efficiency criterion.

FIG. 27.

Optimum values of relative roughness height on the basis of effective efficiency criterion.

## Tables

Table I.

System and operating parameters used in analytical calculations.

Table II.

Enhancement in thermal efficiency as a function of relative roughness pitch (P/e) at , , , , and .

Table III.

Enhancement in thermal efficiency as a function of relative gap position (d/w) at , , , , and .

Table IV.

Enhancement in thermal efficiency as a function of angle of attack at , , , , and .

Table V.

Enhancement in thermal efficiency as a function of relative gap width (g/e) at , , , , and .

Table VI.

Enhancement in thermal efficiency as a function of relative roughness height at , , , , and .

Table VII.

Enhancement in effective efficiency as a function of relative roughness pitch (p/e) at , , , , and .

Table VIII.

Enhancement in effective efficiency as a function of relative gap position (d/w) at , , , , and .

Table IX.

Enhancement in effective efficiency as a function of angle of attack at , , , , and .

Table X.

Enhancement in effective efficiency as a function of relative gap width (g/e) at , , , , and .

Table XI.

Enhancement in effective efficiency as a function of relative roughness height at , , , , and .

/content/aip/journal/jrse/3/2/10.1063/1.3574430
2011-04-06
2014-04-18

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