EuroSun2008-5
Efficiency test results
The collector was tested according to both steady state test (EN 12975-2;section 6.1) and dynamic test (EN 12975-2; section 6.3) methods. The corresponding characteristic parameters are presented in Table 1.
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Table 1. Efficiency curve parameters after steady-state test results
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Steady-state test parameters
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Dynamic test parameters
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По
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ai
[W/°C. m2]
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a2
[W/°C2.m2]
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П)ь
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Ci
[W/°C. m2]
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C2
[W/°C2.m2]
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C5
[J/kg°C]
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Kd(0)
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0.725
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3.599
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0.007
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0.794
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3.483
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0.010
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13647
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0.725
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Incidence angle modifier (IAM) values obtained, after both test methodologies, for longitudinal and transversal incidences are presented in Table 2.
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Table 2. Steady-state and dynamic test results for transversal and longitudinal incidence angle modifier values
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Test
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0
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10
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15
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20
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25
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30
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35
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40
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50
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60
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Steady
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Kt(0)
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0.990
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0.999
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0.949
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0.887
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0.632
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0.494
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0.481
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0.482
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--
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Ki(0)
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--
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--
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--
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--
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--
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--
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0.957
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--
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0.853
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Dynamic
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Kt(0)
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0.966
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0.992
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0.931
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0.840
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0.529
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0.362
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0.328
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0.057
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--
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Ki(0)
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--
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--
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--
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--
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--
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--
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0.991
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--
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0.781
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Longitudinal and transversal IAM functions were constructed after 2-points based and linear approximations, respectively (Carvalho et al, 2007). The composed IAM, illustrated in figure 2, follows the McIntire (1983) approximation:
K(9) = K(9l,9t )* K(9l,0)K(0,9t) (8)
The weighted average hemispherical IAM, calculated according to Eq.(7), yields Kdfh =0.529.
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