CLTDs for sunlighted walls for north latitudes

From ASHRAE (1989), with permission

Values shown for Group A walls

Wall facing

Solar time, h

Hour of Max. CLTD

Min. CLTD

Max. CLTD

Max. - Min. CLTD

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

N

14

14

14

13

13

13

12

12

11

11

10

10

10

10

10

10

11

11

12

12

13

13

14

14

2

10

14

4

NE

19

19

19

18

17

17

16

15

15

15

15

15

16

16

17

18

18

18

19

19

20

20

20

20

22

15

20

5

E

24

24

23

23

22

21

20

19

19

18

19

19

20

21

22

23

24

24

25

25

25

25

25

25

22

18

25

7

SE

24

23

23

22

21

20

20

19

18

18

18

18

18

19

20

21

22

23

23

24

24

24

24

24

22

18

24

6

S

20

20

19

19

18

18

17

16

16

15

14

14

14

14

14

15

16

17

18

19

19

20

20

20

23

14

20

6

SW

25

25

25

24

24

23

22

21

20

19

19

18

17

17

17

17

18

19

20

22

23

24

25

25

24

17

25

8

W

27

27

26

26

25

24

24

23

22

21

20

19

19

18

18

18

18

19

20

22

23

25

26

26

1

18

27

9

NW

21

21

21

20

20

19

19

18

17

16

16

15

15

14

14

14

15

15

16

17

18

19

20

21

1

14

21

7