(b)Formula 7

Assume that during the summer the HVAC system is in the cooling mode. The air leaving the cooling coil is at 55°F and 90% rh. In order to maintain the desired 47% rh in the space, moisture must be added using the following formula:

Desired space 80°F 47% rh= 5.19 gr/ft3 (Formula 1)

55°F 90% = 4.89 x 0.90

3

= 4.40 gr/ft

Grains to add

= 0.79 gr/ft3

15,000 x 0.79 x 60 min/hr

= 101.57 lbs/hr

7,000 grains/lb

 

(8)In considering Process and Environment, in Tables 5 through 7 you will find conditions and processes that may affect your calculation and should be addressed.

(a)Table 5 shows the outdoor temperature at which the rh would cause condensation on the windows to the outside. Should your outdoor conditions make this a possibility, an outdoor setback sensor may be a solution.

(b)Table 6 describes the moisture gain of various material and if your process or environment includes a great amount of these materials that are constantly introduced to the area, its affects must be considered.

(c)Table 7 identifies many recommended indoor conditions for various locations and processes, these can be of use when deciding what conditions would be most beneficial in your application.

(d)In Figure 2, you will find the ASHRAE physchrometric chart describing the enthalpy of dry air and the effects to and from rh in the air.

Table 5. Inside Relative Humidities At Which Moisture Will Condense On Windows

Outside

 

Inside Temperature (°F/°C)

 

 

Outside

 

Inside Temperature (°F/°C)

 

Temperature

 

 

 

Temperature

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

°F

°C

60/

 

65/

70/

75/

 

80/

 

°F

°C

60/

 

65/

70/

75/

 

80/

15.5

 

18.3

21

23.8

 

26.6

 

15.5

 

18.3

21

23.8

 

26.6

 

 

 

 

 

 

 

 

 

Single Windows, Still Air

 

 

 

 

 

Single Windows, Wind

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

-50

-45

9

 

9

9

8

 

8

 

-50

-45

4

 

3

3

3

 

2

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

-40

-40

12

 

12

11

10

 

10

 

-40

-40

5

 

4

4

4

 

3

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

-30

-34

16

 

14

14

13

 

13

 

-30

-34

7

 

6

6

6

 

5

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

-20

-29

20

 

18

18

17

 

16

 

-20

-29

10

 

9

9

8

 

7

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

-10

-23

25

 

23

22

21

 

20

 

-10

-23

14

 

13

12

11

 

10

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

0

-18

32

 

29

27

25

 

24

 

0

-18

20

 

18

16

15

 

13

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

10

-12

39

 

36

33

31

 

29

 

10

-12

28

 

24

22

20

 

18

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

20

-7

47

 

43

40

37

 

35

 

20

-7

36

 

32

30

26

 

24

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

30

-1

57

 

52

50

45

 

42

 

30

-1

48

 

41

38

34

 

30

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

40

4

70

 

63

60

53

 

50

 

40

4

62

 

54

49

43

 

40

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

NOTE: Bold areas indicate that moisture will be in the form of frost on windows.

10-10

Page 21 2008-10-01

Page 28 Page 30
Page 29
Image 29
Nortec NHTC, NHPC manual Outside Inside Temperature F/C, 18.3 23.8, Single Windows, Still Air Single Windows, Wind
Page 28 Page 30

NHPC, NHTC specifications

The Nortec NHTC (Nortec High Temperature Charging) and NHPC (Nortec High Performance Charging) systems are cutting-edge solutions designed for optimal charging management, particularly in industrial and commercial environments. These systems are engineered to meet the high demands of battery charging, ensuring efficiency, reliability, and safety.

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