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Control Airflows Between Rooms: Pressurization

The document discusses controlling airflows between rooms through pressurization. It shows that a room is pressurized when the entering airflow is higher than the leaving airflow, creating a positive net flow and pressure differential. Conversely, a room is depressurized when the entering airflow is lower than the leaving airflow, creating a negative net flow. Effective pressure control depends on understanding each room's unique airtightness, and common control strategies include direct pressure differential control, differential flow tracking control, and hybrid control.

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S Das
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40 views1 page

Control Airflows Between Rooms: Pressurization

The document discusses controlling airflows between rooms through pressurization. It shows that a room is pressurized when the entering airflow is higher than the leaving airflow, creating a positive net flow and pressure differential. Conversely, a room is depressurized when the entering airflow is lower than the leaving airflow, creating a negative net flow. Effective pressure control depends on understanding each room's unique airtightness, and common control strategies include direct pressure differential control, differential flow tracking control, and hybrid control.

Uploaded by

S Das
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
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2/20/2011

Control Airflows Between Rooms


Pressurization
2,000
Single Room Pressurization 1,900
400
Leakage Area 380
1,800
(Sq. in.) 360
1,700
Room pressurization 1,600
340
320
1,500
300
Entering (SA) airflow rate is 1,400 280
1,300
higher than leaving (EA + 1,200
260
240

RA) airflow rate in the 1,100


1,000
220
200
room, room net (offset) 900
800
180
160
flow is positive. 700 140
600 120
500 100

Room depressurization 400


300
80
60

Entering (SA) airflow rate is 200


100
40
20

lower than leaving (EA + 0


0 0.005 0.01 0.015 0.02 0.025 0.03 0.035 0.04 0.045 0.05 0.055 0.06 0.065 0.07 0.075 0.08

RA) airflow rate in the Pressure Differential Between Rooms (in.)


room, room net (offset) Room Net Flow Rate vs. Pressure Differential
flow is negative.

Control Airflows Between Rooms


Pressurization
Single Room Pressurization Room Pressure Control Strategies

Room Airtightness is the key element in the


offset
value and the resulting pressure
differential, and each room airtightness is
unique and unknown unless tested.

value defines a pressurization control


strategy. Typical pressurization control
techniques:

Direct Pressure-Differential Control


Differential Flow Tracking Control
Hybrid Control

12

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