CLTDs for sunlighted walls for north latitudes

From ASHRAE (1989), with permission

Values shown for Group C 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

13

12

11

10

9

8

8

7

7

8

8

9

10

12

13

14

15

16

17

17

17

16

22

7

17

10

NE

19

17

16

14

13

11

10

10

11

13

15

17

19

20

21

22

22

23

23

23

23

22

21

20

20

10

23

13

E

22

21

19

17

15

14

12

12

14

16

19

22

25

27

29

29

30

30

30

29

28

27

26

24

18

12

30

18

SE

22

21

19

17

15

14

12

12

12

13

16

19

22

24

26

28

29

29

29

29

28

27

26

24

19

12

29

17

S

21

19

18

16

15

13

12

10

9

9

9

10

11

14

17

20

22

24

25

26

25

25

24

22

20

9

26

17

SW

29

27

25

22

20

18

16

15

13

12

11

11

11

13

15

18

22

26

29

32

33

33

32

31

22

11

33

22

W

31

29

27

25

22

20

18

16

14

13

12

12

12

13

14

16

20

24

29

32

35

35

35

33

22

12

35

23

NW

25

23

21

20

18

16

14

13

11

10

10

10

10

11

12

13

15

18

22

25

27

27

27

26

22

10

27

17