CLTDs for sunlighted walls for north latitudes

From ASHRAE (1989), with permission

Values shown for Group D 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

13

12

10

9

7

6

6

6

6

6

7

8

10

12

13

15

17

18

19

19

19

18

16

21

6

19

13

NE

17

15

13

11

10

8

7

8

10

14

17

20

22

23

23

24

24

25

25

24

23

22

20

18

19

7

25

18

E

19

17

15

13

11

9

8

9

12

17

22

27

30

32

33

33

32

32

31

30

28

26

24

22

16

8

33

25

SE

20

17

15

13

11

10

8

8

10

13

17

22

26

29

31

32

32

32

31

30

28

26

24

22

17

8

32

24

S

19

17

15

13

11

9

8

7

6

6

7

9

12

16

20

24

27

29

29

29

27

26

24

22

19

6

29

23

SW

28

25

22

19

16

14

12

10

9

8

8

8

10

12

16

21

27

32

36

38

38

37

34

31

21

8

38

30

W

31

27

24

21

18

15

13

11

10

9

9

9

10

11

14

18

24

30

36

40

41

40

38

34

21

9

41

32

NW

25

22

19

17

14

12

10

9

8

7

7

8

9

10

12

14

18

22

27

31

32

32

30

27

22

7

32

25