CALCULATION OF TOTAL LOADS

Total loads from different subprocesses and environment (building) to the ventilated enclosure are calculated using design tools (heat, humidity, impuri-

Ties). Loads usually are time dependent, which has to be taken into account. See Fig. 3.11.

Explanations of Fig. 3.11

Step I: Loads to General Ventilation System

Loads from different sources to the general ventilation system are deter­mined taking into account local protection.

Step 2: Total Loads

Calculate total loads, taking into account the time dependence of the loads.

Step 3: Check for a Source That Has Governing Role to Total Loads

• Check whether there is some single source that alone produces most of the loads.

• If you are calculating the loads at first, there might not be a need to reconsider at this stage.

• If the answer is yes,

• If construction is the main source, return to Building Layout and Construction and reconsider whether there is something that can be changed in building construction to reduce loads.

• Reconsider the target levels of local zone to reduce emission of a single source.

• If the answer is no, reconsider the target levels of the main zone (general ventilation), if loads cannot be reduced.

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