CLTDs for sunlighted walls for north latitudes

From ASHRAE (1989), with permission

Values shown for Group E 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

12

10

8

7

5

4

3

4

5

6

7

9

11

13

15

17

19

20

21

23

20

18

16

14

20

3

22

19

NE

13

11

9

7

6

4

5

9

15

20

24

25

25

26

26

26

26

26

25

24

22

19

17

15

16

4

26

22

E

14

12

10

8

6

5

6

11

18

26

33

36

38

37

36

34

33

32

30

28

25

22

20

17

13

5

38

33

SE

15

12

10

8

7

5

5

8

12

19

25

31

35

37

37

36

34

33

31

28

26

23

20

17

15

5

37

32

S

15

12

10

8

7

5

4

3

4

5

9

13

19

24

29

32

34

33

31

29

26

23

20

17

17

3

34

31

SW

22

18

15

12

10

8

6

5

5

6

7

9

12

18

24

32

38

43

45

44

40

35

30

26

19

5

45

40

W

25

21

17

14

11

9

7

6

6

6

7

9

11

14

20

27

36

43

49

49

45

40

34

29

20

6

49

43

NW

20

17

14

11

9

7

6

5

5

5

6

8

10

13

16

20

26

32

37

38

36

32

28

24

20

5

38

33