DriSteem Vaporstream Specifikace stáhnout pdf (Strana 18)

P a g e 1 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 1 5

Sample Problem 1

Calculate the humidification load for a printing plant where:

• The desired conditions in the space are 21 °C and 50% RH.

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

• The dimensions of the building are:

40 m × 25 m × 4 m (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 15-1 on Page 15: Read across the 21 °C line to

the 50% RH column to find 9.31 g/m

/h.

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

the -10 °C line to the 45% RH column to find 0.97 g/m

/h.

3. Determine the moisture in g/h to be added per m

/h by

subtracting the moisture content of the entering conditions from

the moisture content of the desired conditions:

9.31 g/m

/h – 0.97 g/m

= 8.34 g/m

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

cubic meters of the space and multiplying that by the air changes

per hour to find air quantity to be humidified in m

/h:

40 m × 25 m x 4 m × 1 air change per hour

= 4,000 m

5. Determine the humidification load by multiplying the quantity

of air to be humidified by moisture to be added:

4,000 m

/h × 8.34 g/m

= 33,360 g/h = 33.36 kg/h

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DriSteem Vaporstream Specifikace Strana 18