Room Air Pressure Control Using Dual-Vent Flow Resistance Adjustment
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Solution Overview
Problem
Existing low-pressure air purification devices used in construction and renovation sites face challenges in maintaining a stable pressure difference while minimizing heat loss and ensuring effective filtration, as they often create a large pressure differential that complicates air control and heating requirements.
Innovation Solution
The apparatus includes a control means with a turnable control plate and a connected pressure difference sensor to adjust air flow between two vents, incorporating a heater and a low-pressure air purification device with a HEPA-grade air filter, allowing for manual or automated control of air pressure and filtration, and featuring a detachable air receive duct for efficient operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a large pressure difference (50-60 Pa below surroundings) is created in the work space, then dust filtration effectiveness is improved, but air control and door operation become difficult
Solution Approach 1:
The invention changes the pressure parameter from a large negative pressure (50-60 Pa below surroundings) to a small negative pressure (8-10 Pa below surroundings). This parameter change maintains dust filtration effectiveness while significantly improving air control and door operation ease.
2Reliability
If a large pressure difference is maintained in the work space, then dust containment is improved, but heat loss increases significantly
Solution Approach 1:
The invention reduces the pressure difference parameter from 50-60 Pa to 8-10 Pa below atmospheric pressure. This smaller pressure differential maintains effective dust containment (6-10 air changes per hour with HEPA H13 filtration) while dramatically reducing the energy required to maintain the pressure difference and the associated heat loss from air removal and replacement.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution maintains a stable pressure difference, reduces heat loss by recycling heated air, and ensures effective filtration, enhancing operational efficiency and cost savings, particularly during heating periods.
Implementation Method 1
the control unit is connected to a pressure difference sensor detecting pressure difference in the room and its surroundings
Implementation Method 2
the second air vent comprises a heater for heating the flowing air
Implementation Method 3
a fan that is arranged to generate air flow through the apparatus
Implementation Method 4
filtration of at least HEPA H13 grade is used
Data Source
Figure 1
Figure 2
AI summary
An apparatus and method for adjusting air pressure of a room. The apparatus comprises an air receive duct (4) arranged to receive air from the room (2), an air distribution casing (5) connected to the receive duct (4), first and second air vents (6, 7) connected to the air distribution casing (5) and arranged to convey air coming from the receive duct (4) out of the apparatus (1), and a control means (8) arranged to adjust the flow resistance of the second air vent (7) in relation to that of the first air vent (6).