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14 декабря, 2021
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NORMALIZED EFFICIENCY CURVE
With equation (9) and (10) we can calculate the normalized efficiency curve.
EN 12975 [ 1 ] defines the following conditions for that curve:
• beam radiation: 680 W/m2 (85% of the global radiation)
• diffuse radiation: 120 W/m2 (15% of the global radiation)
• global radiation: 800 W/m2
• Incidence angle: 15°
Vnorm =Ъ. !AMdir_15 + G. MGdJ ; IAMdir_e = 1 — b0 • ^—S — — ij (9)
|
LS |
WLS |
|||||||
|
min |
coeff. |
max |
U |
min |
coeff. |
max |
U |
|
|
І0 |
0,710 |
0,716 |
0,722 |
0,006 |
0,707 |
0,713 |
0,718 |
0,005 |
|
b0 |
0,119 |
0,144 |
0,170 |
0,026 |
0,106 |
0,128 |
0,149 |
0,022 |
|
IAMdfu |
0,827 |
0,868 |
0,908 |
0,041 |
0,856 |
0,894 |
0,933 |
0,038 |
|
k1 |
-6,445 |
-5,890 |
-5,335 |
0,555 |
-6,532 |
-6,109 |
-5,686 |
0,423 |
|
k2 |
-0,049 |
-0,038 |
-0,027 |
0,011 |
-0,043 |
-0,035 |
-0,027 |
0,008 |
|
Ceff |
-3821,2 |
-636,0 |
2549,1 |
3185,1 |
-3039,4 |
-612,1 |
1815,2 |
2427,3 |
|
Table 1: Collector coefficients with uncertainties in the 95% confidence interval |
The uncertainty of each point of the normalized efficiency curve is calculated with equation (11). This equation is comparable to equation (7). With the collector coefficients determined by the quasi-dynamic test, it is also possible to calculate the equivalent normalized efficiency curve of a steady state test.