DriSteem Vaporstream Especificaciones descargar pdf (Pagina 11)

P a g e 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 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 70 °F and 50% RH.

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

• A mechanical ventilation system circulates air at 9,000 cfm, 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 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 multiplying total

air circulation by the percentage of outside air:

9,000 cfm × 25% = 2,250 cfm

5. Determine the humidification load by multiplying the quantity

of air to be humidified by moisture to be added:

2,250 cfm × 3.14 lbs/hr

___________________

100 cfm

= 70.65 lbs/hr

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DriSteem Vaporstream Especificaciones Pagina 11