The calculation of the air supply volume in the clean room of the clean room mainly refers to the calculation of the air volume under the conditions of known cleanliness or allowing the bacteria to be concentrated. The steps are as follows:

QI Calculation of Air Supply Volume in Refrigeration Room of Positive Pressure Cleanroom

Calculation of air supply volume in the turbulent clean room cooling room Q1-1

Rust-free clean room refrigeration room - 1000, 10,000, 100000, 300,000 clean rooms, the air supply is calculated based on the number of air changes:

QI-1=KV

Where: K - the number of air changes;

V——net volume of the clean room refrigeration room;

N——stabilized dust concentration in the non-unidirectional flow clean room refrigeration room;

G——The amount of dust generated per unit volume in the clean room of the clean room;

M——Dust concentration of outdoor air;

S——the ratio of the return air volume to the air supply volume;

ηH - the total efficiency of the filter on the return air path;

ηX - the total efficiency of the filter on the fresh air path.

In the actual engineering calculation, the number of ventilation times K is difficult to calculate by the above formula, and the number of experience ventilations is generally used. In the clean room standards of various countries, the number of experience ventilations of the same level of non-unidirectional flow clean room is not the same. China's "Code for Design of Clean Plants" (GB 50073-2001) clearly specifies the number of experience ventilations required for the calculation of clean air supply for non-unidirectional flow clean rooms of different grades, as shown in the following table:

Note:

1 The number of air changes is applicable to the clean room refrigeration room with a floor height less than 4.0m.

2 If the number of people in the room is small and the heat source is small, the lower limit should be adopted.

3 The number of air changes in the clean room of more than 100000 is not less than 12 times.

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