DriSteem Vaporstream Specifikace stáhnout pdf (Strana 9)

P a g e 4 • D R I - S T E E M D e s i g n G u i d e

D R I - S T E E M D e s i g n G u i d e • P a g e 5

Sample Problem 1

Calculate the humidification load for a printing plant where:

• The desired conditions in the space are 70 °F and 50% RH.

• The outside entering conditions are 10 °F and 45% RH.

• The dimensions of the building are 120' × 80' × 12'

(length × width × height).

• Air changes per hour = 1

Solution to Sample Problem 1 using

the natural ventilation method

1. Find the moisture content of your desired conditions by

referring to Table 6-1 on Page 6: Read across the 70 °F line to the

50% RH column to find 3.44 lbs/hr/100 cfm.

2. Find the moisture content of the entering air by reading across

the 10 °F line to the 45% RH column to find 0.30 lbs/hr/100 cfm.

3. Determine the moisture in lbs/hr to be added per 100 cfm by

subtracting the moisture content of the entering conditions from

the moisture content of the desired conditions:

3.44 lbs/hr/100 cfm – 0.30 lbs/hr/100 cfm

= 3.14 lbs/hr/100 cfm

4. Determine the air quantity to be humidified by finding the total

cubic feet of the space, multiplying that by the air changes per

hour, and dividing by 60 minutes/hr to find air quantity to be

humidified in cfm:

120' × 80' × 12' × 1 air change per hour

_________________________________

60 minutes/hr

= 1,920 cfm

5. Determine the humidification load by multiplying the quantity

of air to be humidified by moisture to be added:

1,920 cfm × 3.14 lbs/hr

___________________

100 cfm

= 60.29 lbs/hr

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DriSteem Vaporstream Specifikace Strana 9