CLTDs for glass

From ASHRAE (1989), with permission

Solar time

CLTD,
°F

Solar time

CLTD,
°F

1

1

13

12

2

0

14

13

3

-1

15

14

4

-2

16

14

5

-2

17

13

6

-2

18

12

7

-2

19

10

8

0

20

8

9

2

21

6

10

4

22

4

11

7

23

3

12

9

24

2

Corrections: The values in the table were calculated for an inside temperature of 78°F and an outdoor maximum temperature of 95°F with an outdoor daily range of 21°F.  The table remains approximately correct for other outdoor maximums of 93°F to 102°F and other outdoor daily ranges of 16°F to 32°F, provided the outdoor daily average temperature remains approximately 85°F.   If the room air temperature is different from 78°F and/or the outdoor daily average temperature is different from 85°F, the following rules apply: