Gen

= 5.38 X 1.989 X 0.922 + 3.58 X 0.835 "1 - cos(40)

12.62 MJ/m2

The results for the other months are shown in Table 11.13. Table 11.13 Results of (Ta)/(Ta)„ for Other Months for Example 11.12

Month

(Ta)/(Ta)„

(to)b

S (MJ/m2)

(to)

(to)/(to)b

January

0.96

0.922

12.62

0.90

0.94

February

0.96

0.922

15.31

0.90

0.94

March

0.95

0.912

17.85

0.88

0.92

April

0.93

0.893

18.33

0.87

0.91

May

0.92

0.883

19.42

0.86

0.90

June

0.91

0.874

20.25

0.85

0.89

July

0.91

0.874

20.36

0.86

0.90

August

0.92

0.883

20.53

0.86

0.90

September

0.93

0.893

20.37

0.87

0.91

October

0.95

0.912

17.92

0.89

0.93

November

0.96

0.922

14.36

0.90

0.94

December

0.96

0.922

11.50

0.90

0.94

Now we can proceed with the !>, /-chart method calculations. Again, the estimations for January are shown in detail below. The minimum monthly average critical radiation ratio is given by Eq. (11.45):

FrUl (Tmm

rnRnKTHo

(Ta)n rnRnKTHo

0.83

A = 2.943 - 9.271Kt + 4.031KT = 2.943 - 9.271 X 0.49 + 4.031(0.49)2 = -0.6319

B = -4.345 + 8.853Kt - 3.602K2 = -4.345 + 8.853 X 0.49 - 3.602(0.49) = -0.8719

exp exp

0.229

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