Browse Prior Art Database

Environmental Monitoring and Control System for Clean Room Heating, Ventilation, and Air Conditioning Systems

IP.com Disclosure Number: IPCOM000106453D
Original Publication Date: 1993-Nov-01
Included in the Prior Art Database: 2005-Mar-21
Document File: 2 page(s) / 75K

Publishing Venue

IBM

Related People

Montgomery, WS: AUTHOR [+2]

Abstract

Disclosed is a system which integrates a HVAC (Heating, Ventilation, and Air Conditioning) control system, a clean room environmental monitoring system, and a motion detector lighting control system into a hybrid-integrated control-monitoring system. The hybrid system uses temperature sensors, humidity sensors, occupancy sensors, room pressure differential sensors, anenometers, and particle counters to send input signals to a programmable logic controller which processes the input and controls the room temperature and humidity levels, monitors the room differential pressure, air particulates, and power consumed by the air conditioning fans. Fan speed is varied based on room temperature, cleanliness levels, and occupancy.

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Environmental Monitoring and Control System for Clean Room Heating, Ventilation, and Air Conditioning Systems

      Disclosed is a system which integrates a HVAC (Heating,
Ventilation, and Air Conditioning) control system, a clean room
environmental monitoring system, and a motion detector lighting
control system into a hybrid-integrated control-monitoring system.
The hybrid system uses temperature sensors, humidity sensors,
occupancy sensors, room pressure differential sensors, anenometers,
and particle counters to send input signals to a programmable logic
controller which processes the input and controls the room
temperature and humidity levels, monitors the room differential
pressure, air particulates, and power consumed by the air
conditioning fans.  Fan speed is varied based on room temperature,
cleanliness levels, and occupancy.

      A typical clean room HVAC control system has temperature
sensors, humidity sensors, and room pressurization sensors sending
clean room conditions to a controller which processes those input
signals and sends controlled signals to valves, dampers, and other
HVAC control devices to maintain the clean room at the specified,
preset conditions.  An environment monitoring system collects
temperature, humidity, room pressurization, air flow velocity, and
contaminant particle size and quantity of the particles in the clean
room, sounds an alarm when the limits are exceeded, and records the
data into a data collection system.  The data collection system
tracks the time each bit of data was stored.  This information can be
used by quality analysis personnel to verify clean room conditions
during the manufacturing process, or to assist in failure analysis of
completed products.

      When the clean room is occupied and the particles are well
below the room classification, the fans will slow to the low limit
velocity variable for occupied areas from the UEPA (Ultra Effi...