Weather Data - Hours available for evaporative cooling:


 Location:  Dallas Ft. Worth, TX      Elev: 650    Lat: 32/47N  Long:97/62W

Mean Frequency of occurrence of Dry Bulb Temperature with Mean Coincident Wet Bulb Temperature for each Dry Bulb Temperature Range:

ASHRAE  design Dry Bulb and Mean Coincident Wet Bulb:
   1% Scale:    2.5% Scale:    5% Scale:            Design Wet Bulb:
Db       Wb       Db      Wb        Db      Wb           1%     2.5%     5%
 102      75       100      75         97      75           78      78        77
  
Average number of hours within each temperature range and discharge temp. (see notes):

January - April Weather Data

Temp Range: Deg (f) January February March April Total
Low High Mean Hours Wb Tout Hours Wb Tout Hours Wb Tout Hours Wb Tout  
115 120 117.5                          
110 114 112                          
105 109 107                          
100 104 102                          
95 99 97                   1 65 66.6 1.0
90 94 92             1 67 68.3 1 69 70.2 2.0
85 89 87       1 60 60.6 4 65 66.1 13 68 69.0 18.0
80 84 82       3 61 61.6 12 64 64.9 51 67 67.8 66.0
75 79 77 5 59 59.4 7 59 59.7 26 61 61.8 81 65 65.6 119.0
70 74 72 14 58 58.5 17 57 57.8 47 59 59.7 128 63 63.5 206.0
65 69 67 28 58 58.5 33 55 55.9 77 57 57.5 139 60 60.4 277.0
60 64 62 45 54 54.4 53 53 53.5 98 54 54.4 123 56 56.3 319.0
55 59 57 57 49 49.4 72 49 49.4 101 50 50.4 87 51 51.3 317.0
50 54 52 95 46 46.3 97 45 45.4 108 45 45.4 56 47 47.3 356.0
45 49 47 98 42 42.3 106 41 41.3 105 42 42.3 27 42 42.3 336.0
40 44 42 106 38 38.2 112 37 37.3 80 38 38.2 10 38 38.2 308.0
35 39 37 99 33 33.2 79 33 33.2 48 33 33.3 3 34 34.4 229.0
30 34 32 57 31 31.1 62 29 29.2 24 29 32.5 1 32 32.5 144.0
Total hours Temp out over 40(f) 342   389   579   707 Total hours for this period 2017

Note: 1.  Db = Dry Bulb(f) temperature, Wb = Mean coincident wet bulb temp (f).  Tout = Discharge Temperature (f).   Only hours where discharge temp is over 400(f) is included in total hours available for evaporative cooling.

May - August Weather Data

Temp Range: Deg (f) May June July August Total
Low High Mean Hours Wb Tout Hours Wb Tout Hours Wb Tout Hours Wb Tout  
115 120 117.5                          
110 114 112                          
105 109 107                   1 76 77.4 1.0
100 104 102       1 76 77.3 27 75 76.4 24 74 75.4 52.0
95 99 97 3 75 76.1 31 75 76.1 93 75 76.1 80 74 75.2 207.0
90 94 92 16 73 74.0 91 74 74.9 122 74 74.9 112 73 74.0 341.0
85 89 87 65 71 71.8 123 73 73.7 129 73 73.7 124 72 72.8 441.0
80 84 82 105 69 69.7 141 72 72.5 160 72 72.5 157 71 71.6 563.0
75 79 77 137 68 68.5 162 70 70.4 141 71 71.3 157 70 70.4 597.0
70 74 72 165 65 65.4 116 68 68.2 62 68 68.2 75 68 68.2 418.0
65 69 67 137 62 62.5 40 64 64.4 6 62 62.3 11 63 36.2 194.0
60 64 62 69 58 58.2 13 59 59.2 1 58 58.2 4 59 59.2 87.0
55 59 57 32 53 53.2 2 54 54.2             34.0
50 54 52 14 49 49.2                   14.0
45 49 47 1 44 44.2                   1.0
40 44 42                          
35 39 37                          
30 34 32                          
Total hours Temp out over 40(f) 744   720   741   745 Total hours for this period 3002

September - December Weather Data

Temp Range: Deg (f) September October November December Total
Low High Mean Hours Wb Tout Hours Wb Tout Hours Wb Tout Hours Wb Tout  
115 120 117.5                          
110 114 112                          
105 109 107                          
100 104 102 1 74 75.4                   1.0
95 99 97 21 74 75.2                   21.0
90 94 92 53 73 74.0 8 69 70.2             61.0
85 89 87 83 72 72.8 23 69 69.9 1 66 67.1       107.0
80 84 82 112 70 70.6 57 68 68.7 9 65 65.9 1 62 63.0 179.0
75 79 77 159 69 69.4 85 66 66.6 30 63 63.7 5 62 62.8 279.0
70 74 72 143 66 66.3 128 63 63.5 55 61 61.6 16 59 59.7 342.0
65 69 67 88 62 62.3 129 60 60.4 78 58 58.5 39 57 57.5 334.0
60 64 62 40 57 57.3 121 56 56.3 96 55 55.4 64 54 54.4 417.0
55 59 57 16 53 53.2 92 51 51.3 109 51 51.3 77 49 49.4 294.0
50 54 52 3 49 49.2 63 47 47.3 111 46 46.3 104 56 55.8 335.0
45 49 47 1 46 46.1 28 43 43.2 95 42 42.3 121 42 42.3 245.0
40 44 42       7 39 39.2 77 38 38.2 124 38 38.2 208.0
35 39 37       1 34 34.2 40 33 33.2 96 34 34.2 137.0
30 34 32             16 29 29.2 56 29 29.2 72.0
Total hours Temp out over 40(f) 720   734   584   427 Total hours for this period 2615
Total hours available for evaporative cooling  

Data published by Premier Industries, Inc., in part from data contained in EcoDyne's Weather Data Handbook no longer in print.  Premier Industries, Inc., provides these data for informational use only.  All reasonable precautions have been taken to maintain integrity in these data however  Premier Industries will not be responsible for it's accuracy.  Any responsibility for the use of this information shall be borne by the user.