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ATEC/Indirex

Water Evaporation Rate / Air Stream Moisture Addition - Worksheet

www.HaveACoolDay.com

Evaporative Cooling Equipment / Innovation

MoistureAdditionEC.xls

Updated:

Jan-01

Ph: 303.816.7075

All calculations based on sea level psychrometric chart

Fx: 303.838.9651

Design Conditions

Dry Bulb Temperature

110

110

105

105

100

100

100

95

95

95

90

90

85

85

80

80

80

75

75

70

70

oF

Wet Bulb Temperature

75

70

75

70

75

70

65

70

65

60

65

60

65

60

65

60

55

60

55

60

55

oF

Ralative Humidity

19.5%

12.5%

25.0%

16.5%

31.5%

22.0%

13.0%

28.5%

18.0%

9.0%

25.0%

14.5%

34.0%

21.0%

45.0%

30.0%

16.5%

41.0%

25.0%

56.0%

38.0%

Humidity Ratio

0.0106

0.0066

0.0118

0.0077

0.0130

0.0089

0.0052

0.0100

0.0064

0.0031

0.0075

0.0043

0.0087

0.0054

0.0098

0.0065

0.0036

0.0077

0.0047

0.0088

0.0058

LBm/LBd

Specific Volume

14.60

14.50

14.50

14.40

14.40

14.30

14.20

14.20

14.15

14.05

14.00

13.90

13.90

13.80

13.60

13.75

13.70

13.65

13.60

13.55

13.45

Ft3/LBd

6" Depth Kuul Media

6" Effectiveness

72%

72%

72%

72%

72%

72%

72%

72%

72%

72%

72%

72%

72%

72%

72%

72%

72%

72%

72%

72%

72%

Supply Air Temperature

84.8

81.2

83.4

79.8

82.0

78.4

74.8

77.0

73.4

69.8

72.0

68.4

70.6

67.0

69.2

65.6

62.0

64.2

60.6

62.8

59.2

oF

Supply Rel. Humidity

63.0%

58.0%

68.0%

62.0%

73.0%

66.0%

59.0%

71.0%

64.0%

57.0%

69.0%

62.0%

74.0%

67.0%

80.0%

72.5%

65.0%

79.0%

70.0%

86.0%

78.0%

Supply Humid Ratio

0.0165

0.0142

0.0168

0.0135

0.0172

0.0138

0.0110

0.0142

0.0114

0.0089

0.0116

0.0092

0.0120

0.0095

0.0122

0.0098

0.0076

0.0101

0.0080

0.0105

0.0083

LBm/LBd

Specific Volume

14.10

13.90

14.05

13.90

14.05

13.85

13.70

13.80

13.70

13.55

13.65

13.50

13.60

13.50

13.60

13.45

13.30

13.40

13.25

13.40

13.25

Ft3/LBd

Air Volume (cfm)

Water Evaporation Rate / Air Stream Moisture Addition in Gallons per hour

2,100

6.2

8.1

5.3

6.2

4.5

5.3

6.3

4.5

5.4

6.4

4.5

5.4

3.6

4.5

2.7

3.7

4.5

2.7

3.7

1.9

2.8

gal/hr

5,000

14.8

19.3

12.6

14.8

10.6

12.5

15.0

10.8

12.9

15.1

10.7

12.9

8.6

10.8

6.4

8.7

10.7

6.4

8.9

4.5

6.7

gal/hr

8,750

25.9

33.7

22.1

25.8

18.6

21.9

26.2

18.9

22.6

26.5

18.7

22.5

15.1

18.9

11.1

15.3

18.7

11.2

15.5

8.0

11.8

gal/hr

8" Depth Kuul Media

8" Effectiveness

80%

80%

80%

80%

80%

80%

80%

80%

80%

80%

80%

80%

80%

80%

80%

80%

80%

80%

80%

80%

80%

Supply Air Temperature

82.0

78.0

81.0

77.0

80.0

76.0

72.0

75.0

71.0

67.0

70.0

66.0

69.0

65.0

68.0

64.0

60.0

63.0

59.0

62.0

58.0

oF

Supply Rel. Humidity

73%

68%

76%

71%

80%

75%

70%

78%

73%

68%

77%

71%

81%

75%

85%

80%

73%

85%

78%

90%

83%

Supply Humid Ratio

0.0172

0.0140

0.0174

0.0142

0.0176

0.0144

0.0116

0.0147

0.0119

0.0095

0.0121

0.0097

0.0123

0.0100

0.0126

0.0102

0.0081

0.0104

0.0084

0.0107

0.0086

LBm/LBd

Specific Volume

14.05

13.85

14.00

13.80

14.00

13.80

13.65

13.80

13.65

13.50

13.60

13.45

13.55

13.45

13.55

13.40

13.25

13.40

13.25

13.35

13.25

Ft3/LBd

Air Volume (cfm)

Water Evaporation Rate / Air Stream Moisture Addition in Gallons per hour

5,000

16.59

18.80

14.15

16.60

11.67

14.10

16.55

12.09

14.25

16.73

12.00

14.22

9.45

12.16

7.43

9.82

12.03

7.19

9.93