Air conditioning system to calculate indoor air quality index to control air ventilation

An air conditioning system comprising:

• a sensor that measures air quality in an indoor space and air quality in an outdoor space;
• an obtainer that obtains first information indicating the air quality in the indoor space and second information indicating the air quality in the outdoor space, the first information and the second information being output by the sensor;
• and
• a controller that calculates an air quality index based on the first information obtained and the second information obtained, and controls a ventilator that ventilates the indoor space and an air conditioner disposed in the indoor space, based on the air quality index calculated,
• wherein the air quality index is expressed by f(Xn)×gin(Tin, Hin)×gout(Tout, Hout), where f(Xn) denotes a function with respect to Xn that indicates at least one of a carbon dioxide (CO2) concentration, a concentration of total volatile organic compounds (TVOC), a concentration of particulate matter (PM), a nitric oxide (NOX) concentration, a sulfur oxide (SOX) concentration, a trioxygen (O3) concentration, a mold count, or a dust count, gin(Tin, Hin) denoting a function with respect to Tin denoting temperature and Hin denoting humidity in the indoor space, and gout(Tout, Hout) denoting a function with respect to Tout denoting temperature and Hout denoting humidity in the outdoor space,
• when the controller determines that the air quality index obtained when gin(Tin, Hin) is assumed to be 1 is to reach a target range as a result of the ventilator operating, the controller brings the air quality index close to the target range by causing the ventilator to operate, and
• when the controller determines that the air quality index obtained when gin(Tin, Hin) is assumed to be 1 is not to reach the target range as a result of the ventilator operating, the controller brings the air quality index close to the target range by causing the air conditioner to operate.

An air conditioning system comprising:

• a sensor that measures air quality in an indoor space;
• an activity amount measurer that measures an activity amount of a person staying in the indoor space;
• an obtainer that obtains information indicating the air quality in the indoor space, and activity amount information indicating the activity amount of the person, the information being output by the sensor, the activity amount information being output by the activity amount measurer;
• and
• a controller that calculates an air quality index based on the information obtained and the activity amount information obtained, and controls a ventilator that ventilates the indoor space, based on the air quality index calculated,
• wherein the air quality index is expressed by f(Xn)×g(T, H)×h(A), where f(Xn) denotes a function with respect to Xn that indicates at least one of a carbon dioxide (CO2) concentration, a concentration of total volatile organic compounds (TVOC), a concentration of particulate matter (PM), a nitric oxide (NOX) concentration, a sulfur oxide (SOX) concentration, a trioxygen (O3) concentration, a mold count, or a dust count, g(T, H) denotes a function with respect to T denoting temperature and H denoting humidity in the indoor space, and h(A) denotes a function with respect to A denoting an activity amount, and
• when the activity amount indicated by the activity amount information is greater than or equal to a reference amount, the controller decreases a temporal change rate of the air quality index to a predetermined value or less by causing an air conditioner disposed in the indoor space to operate, and thereafter brings the air quality index close to a target range by causing the ventilator to operate.