DriSteem Vaporstream Specifikace stáhnout pdf (Strana 20)

P a g e 1 6 • 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 7

Mechanical ventilation method

The following example shows how to calculate load using the

mechanical ventilation method. This method works best when the

percentage of outside air volume is at least 10%.

Sample Problem 2

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.

• A mechanical ventilation system circulates air at 15,000 m

/h, of

which 25% is outside air.

Solution to Sample Problem 2 using

the mechanical 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 multiplying total

air circulation by the percentage of outside air:

15,000 m

/h × 25% = 3,750 m

5. Determine the humidification load by multiplying the quantity

of air to be humidified by moisture to be added:

3,750 m

/h × 8.34 g/m

/h = 31,275 g/h

= 31.275 kg/h

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DriSteem Vaporstream Specifikace Strana 20