Air conditioning system
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Solution Overview
Problem
The existing air conditioning systems for clean rooms face challenges in maintaining accurate room pressure due to air pressure loss and non-linear relationships between damper opening degrees and air volume, leading to delayed responses and overshoots, necessitating a more precise and simplified configuration.
Innovation Solution
An air conditioning system comprising a first fan for supplying air, a second fan for returning or exhausting air, and a pressure sensor for controlling the fans, with a common chamber above the ceiling serving multiple clean rooms, allowing for precise adjustment of room pressure through linear control of fan rotational speeds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If an air volume adjustment damper is used to maintain room pressure, then the room pressure can be adjusted, but air pressure loss occurs in the duct causing delayed response
Solution Approach 1:
The invention extracts the air volume adjustment function from the duct damper and relocates it to the fan rotational speed control. By controlling the rotational speed of the supply air fan or return air fan, the air volume is adjusted directly at the source, eliminating the need for duct dampers and avoiding air pressure loss in the duct during adjustment.
Solution Approach 2:
The invention replaces the mechanical damper system with an electrical control system that adjusts fan rotational speed. This substitution eliminates the non-linear relationship between damper opening and air volume, providing a more linear and responsive control mechanism for maintaining room pressure.
2Measurement precision
If an air volume adjustment damper is used to maintain room pressure, then the room pressure can be adjusted, but overshoot occurs due to non-linear relationship between opening degree and air volume
Solution Approach 1:
The invention replaces the mechanical damper system with fan rotational speed control, which provides a more linear relationship between control input and air volume output. This substitution eliminates the non-linear characteristics of damper opening that cause overshoot, resulting in more stable room pressure control.
Solution Approach 2:
The invention dynamically adjusts fan rotational speed based on real-time room pressure feedback from pressure sensors. This dynamic control allows for proportional and integral (PI) control that can respond to pressure changes and prevent overshoot, maintaining stable room pressure.
3Adaptability or versatility
If multiple clean rooms have separate chambers above ceilings, then each room can be independently controlled, but the system becomes complex
Solution Approach 1:
The invention merges multiple separate chambers above clean room ceilings into a single common chamber that serves multiple rooms. This consolidation reduces the number of separate air handling components while maintaining the ability to independently control each room's pressure through individual fan units, thereby simplifying the overall system configuration.
Solution Approach 2:
The common chamber above the ceilings serves multiple functions: it acts as a shared air supply source for multiple clean rooms and a common collection point for return air. This multi-functional design eliminates the need for separate chambers for each room, reducing system complexity while maintaining independent control capabilities.
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 configuration maintains high accuracy in room pressure control while reducing power consumption and simplifying the system, minimizing air pressure loss and response delays, and allowing for flexible design and installation.
Implementation Method 1
a pressure sensor provided in the clean room
Implementation Method 2
a first fan configured to supply air to a clean room from a chamber including a space above a ceiling of the clean room
Implementation Method 3
a second fan configured to perform at least one of returning the air from the clean room through the chamber and exhausting the air from the clean room
Data Source
AI summary
Provided is an air conditioning system that maintains a room pressure in a clean room at high accuracy while having a simple configuration. An air conditioning system includes: a fan filter unit including a supply air fan to supply air to a preparation room from a chamber including space above a ceiling of the preparation room; a fan filter unit including a supply air fan to supply the air to the preparation room from the chamber; and a fan filter unit including a return air fan to return the air from the preparation room through the chamber and to exhaust the air from the preparation room, and further includes: a pressure sensor provided in the preparation room; and a control unit to control a return air fan based on a value detected by the pressure sensor.