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The independent and dependent variables’ determined correlations.
| Input /Output | Nu | FF | η |
|---|---|---|---|
| Solar intensity (I(t)) | 0.736497155 | -0.860686749 | 0.901180059 |
| Inlet temperature | -0.121700852 | -0.129893917 | 0.137680071 |
| Outlet temperature | -0.078402787 | -0.180628388 | 0.195011949 |
| Tube temperature | -0.078142782 | -0.19016665 | 0.199890021 |
| Absorber plate temperature | -0.504621 | -0.183191258 | 0.033714789 |
| Atmosphere temperature | 0.73 | -0.88 | 0.93 |
| Twist ratio | -0.57 | -0.42 | -0.28 |
