In the present work, the exergetic efficiency

(η_{e x g})

of a solar heat collector with air jet impingement on an internal conical ring-roughened absorber plate has been analytically determined. The motivation behind the present investigation is to determine the performance of the selected heat transfer enhancement technique in order to bring out the feasibility of the investigation. The geometric parameters of the absorber plate and the jet plate that have been examined are derived from the internal conical ring height

(H_{R})

, inlet flow diameter

(D_{I R})

, internal print diameter of ring

(D_{B R})

, streamwise pitch

(X_{S})

, and spanwise pitch

(Y_{S})

. The optimum values of the roughness parameters have been determined. The optimal values of geometric parameters that fetch the highest

η_{e x g}

for

R e

in the analyzed range between 4000 and 12,900 are a relative roughness height of

H_{R} / D_{H} = 0.110

, a ratio of internal flow diameter to internal print diameter of ring of

D_{I R} / D_{B R} = 1.7

, a ratio of ring diameter to ring height of

D_{O} / H_{R} = 2.33

, a relative streamwise pitch of

X_{S} / D_{O} = 5.28

, and a relative spanwise pitch of

Y_{S} / D_{O} = 3.42

. As compared with smooth duct, the

η_{e x g}

value of the solar heat collector investigated was found to be enhanced 2.2 times higher under similar analytical conditions.

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