Method to control cleanroom conditions

A method to control cleanroom conditions, the method comprising the steps of:

• detecting a first zone particle concentration in a zone of a cleanroom with a particle sensor within said zone of said cleanroom;
• detecting a first occupancy status in said zone of said cleanroom with an occupancy sensor within said zone of said cleanroom;
• detecting heating, ventilation, and air conditioning (HVAC) system conditions in said zone of said cleanroom with a plurality of HVAC sensors,
• wherein said cleanroom is comprised of an HVAC system in communication with said zone of said cleanroom and with a computer processor, and
• wherein said particle sensor, said occupancy sensor and said plurality of HVAC sensors are in communication with said computer processor;
• communicating said first zone particle concentration, said first occupancy status, and the HVAC system conditions to said computer processor;
• determining a first desired zone particle concentration in said zone based on a range of desired HVAC system conditions according to said first occupancy status with said computer processor;
• determining a first control signal to the HVAC system based on said first occupancy status, said first zone particle concentration, and said first desired zone particle concentration;
• communicating said first control signal to the HVAC system;
• activating the HVAC system according to said first control signal;
• detecting a second zone particle concentration in said zone of said cleanroom with said particle sensor within said zone of said cleanroom, after the step of activating the HVAC system according to said first control signal;
• detecting a second occupancy status in said zone of said cleanroom with said occupancy sensor within said zone of said cleanroom;
• detecting second HVAC system conditions in said zone of said cleanroom with said plurality of HVAC sensors;
• communicating said second zone particle concentration, said second occupancy status, and the second HVAC system conditions to said computer processor;
• determining a second desired zone particle concentration in said zone based on said range of desired HVAC system conditions according to said second occupancy status with said computer processor when said first occupancy status is different from said second occupancy status;
• determining a second control signal to the HVAC system based on said second occupancy status, said first zone particle concentration, said second zone particle concentration, said first desired zone particle concentration, said first control signal, and said second desired zone particle concentration;
• communicating said second control signal to the HVAC system;
• and
• activating the HVAC system according to said second control signal.