DriSteem Vaporstream Spezifikationen PDF herunterladen (Seite 8)

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

C a l c u l a t i n g h u m i d i f i c a t i o n l o a d

u s i n g i n c h - p o u n d u n i t s o f m e a s u r e

DRI-CALC software will calculate load for you

The easiest way to calculate humidification load is to use

DRI-CALC, DRI-STEEM’s humidification system sizing and

selection software. The software not only sizes loads, but also selects

equipment, writes as-configured specifications, creates equipment

schedules, and provides as-configured installation instructions for

DRI-STEEM products.

Three methods for calculating humidification load

DRI-CALC uses the following methods for calculating load. Read

through the examples in this section to learn how to manually

calculate load using these same methods:

1. Natural ventilation method

2. Mechanical ventilation method

3. Economizer cycle method

Natural ventilation method

As a general rule, humidification load is based only on the

amount of air entering a building or space. In buildings without

mechanical ventilation systems, humidification load is usually

calculated using the air change method. Buildings can be classified

by number of air changes per hour, with typical air changes being

1, 1, or 2 air changes per hour. For more information about

calculating air infiltration see the chapter on natural ventilation and

infiltration in the ASHRAE Fundamentals Handbook (available at

www.ashrae.org). For noncritical applications, we typically use 1

air changes per hour for calculating load.

Important notes

about calculating load

• When outside air is 10% or less, it is

wise to calculate the load twice. The

first calculation should be made on the

basis of air changes due to mechanical

ventilation; the second should be based

on the natural ventilation method.

Use the larger of the two results for

determining the load.

• Vapor naturally migrates from areas

with high vapor pressure to areas with

low vapor pressure, regardless of air

movement. Vapor retarders reduce vapor

migration, but should only be installed in

accordance with local codes.

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