CLTDs for sunlighted walls for north latitudes

From ASHRAE (1989), with permission

Values shown for Group B 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

15

14

14

13

12

11

11

10

9

9

9

8

9

9

9

10

11

12

13

14

14

15

15

15

24

8

15

7

NE

19

18

17

16

15

14

13

12

12

13

14

15

16

17

18

19

19

20

20

21

21

21

20

20

21

12

21

9

E

23

22

21

20

18

17

16

15

15

15

17

19

21

22

24

25

26

26

27

27

26

26

25

24

20

15

27

12

SE

23

22

21

20

18

17

16

15

14

14

15

16

18

20

21

23

24

25

26

26

26

26

25

24

21

14

26

12

S

21

20

19

18

17

15

14

13

12

11

11

11

11

12

14

15

17

19

20

21

22

22

22

21

23

11

22

11

SW

27

26

25

24

22

21

19

18

16

15

14

14

13

13

14

15

17

20

22

25

27

28

28

28

24

13

28

15

W

29

28

27

26

24

23

21

19

18

17

16

15

14

14

14

15

17

19

22

25

27

29

29

30

24

14

30

16

NW

23

22

21

20

19

18

17

15

14

13

12

12

12

11

12

12

13

15

17

19

21

22

23

23

24

11

23

9