A method comprising detecting an indoor carbon dioxide level; detecting an outdoor fine dust level; driving an air supply fan and an exhaust fan such that an air supply amount of the air supply fan is greater than an exhaust amount of the exhaust fan based on detected indoor carbon dioxide level and outdoor fine dust level; and performing a first indoor pressure control of detecting an indoor pressure and controlling the air supply fan and the exhaust fan. In the indoor pressure control, based on the detected indoor pressure being less than a first set value, a number of revolutions per minute of the exhaust fan is controlled to be decreased, and based on the detected indoor pressure is greater than or equal to a second set value greater than the first set value, the number of revolutions per minute of the exhaust fan is controlled to be increased.

A refrigerant gas sensor is typically attached so that an opening for introducing leaked refrigerant gas into the inside faces upward. With this arrangement, however, a small amount of a different gas such as propane and pesticide, which is sucked from the outside of an air conditioner, may be erroneously recognized as refrigerant gas. On this account, a refrigerant gas sensor 9 includes a detecting element 61 for detecting leakage of refrigerant gas and a casing member 62 provided to surround the detecting element 61. The casing member 62 has a casing opening (first opening) 62a through which the refrigerant gas is introduced into the inside of the casing member 62. The casing opening (first opening) 62a is below the detecting element 61.

A system and method for obtaining environmental data—namely air quality information—from various devices contained within a structure is disclosed herein. The various devices contain sensors that can obtain environmental data, which is then analyzed by the system to determine if any level of a component within the data is outside of a predefined threshold range. If the system determines that the level of the component is outside of the predefined threshold range for that given component, the system will carry out certain steps in order to bring the level within the predetermined threshold range. These steps include selecting the appropriate appliance and the proper operating conditions to most efficiently bring the level back within the predetermined threshold range. Once the system has determined that the level is back within the predetermined threshold range, the system will instruct the selected appliance to turn OFF.

A variable air volume (VAV) box includes a fan operable to induce airflow from a building space through the VAV box and discharge the airflow back to the building space, an air cleaning device positioned to clean the airflow through the VAV box before discharging the airflow back to the building space and configured to affect an air quality of the airflow, and a controller configured to operate the fan to modulate the airflow through the VAV box to achieve a target air quality for at least one of the airflow discharged from the VAV box or air within the building space.

A method of maintaining a desired level of an aerosolized compound within a space to be treated with the compound, the method including providing a diffusion device with the compound in liquid form and a control system for operating the device. The control system includes a sensor in fluid communication with the air within the space to be treated configured to sense the concentration of the compound aerosolized within the space. The diffusion device is operated to diffuse the compound into the space. The concentration of the compound within the space to be treated is sensed with the sensor and operation of the diffusion device is altered based on the concentration of the compound sensed to achieve a desired concentration of compound within the space. The sensing and operation altering steps are repeated periodically to maintain the desired concentration of the compound within the space.

In various embodiments, an air quality-monitoring system (100) may include at least one sensor (106) configured to detect operation of a mechanism (110) within or at a boundary of an indoor environment. The mechanism may be external to an air purifier (102) associated with the indoor environment. The system may include a persistent memory (124) for storing data about the indoor environment observed by the at least one sensor (106). A controller (104) may be communicatively coupled with the at least one sensor and configured to: assemble the data into an air quality profile associated with that environment; determine, based on a signal from the at least one sensor and on the air quality profile, a likelihood that operation of the mechanism will cause a measure of air quality within the indoor environment to fail one or more air quality criteria; and selectively provide, based on the likelihood, an indication that operation of the mechanism will cause the measure of air quality within the indoor environment to fail the one or more air quality criteria.

A heat exchange unit that performs at least one of a cooling and a heating of a liquid medium that is sent to a utilization side equipment includes: a heat exchanger that exchanges heat between a flammable refrigerant and the liquid medium; an electric component as an ignition source; a casing that accommodates the heat exchanger and the electric component; and a gas detection sensor with a detection element that is disposed below the electric component and that detects a gas from the flammable refrigerant.

To provide a system that collects data from each sensor (airflow, temperature, humidity, atmospheric pressure, illuminance, and air pollution) that measures an environmental factor and can evaluate an environment in a factory in a complex manner. Environmental sensors that measure environmental elements including at least airflow from among the airflow, temperature, humidity, atmospheric pressure, illuminance, and a degree of air pollution, which are the environmental elements in a factory where a machining operation is performed, a display unit that visualizes and displays measurement results of a plurality of environmental elements measured by the environmental sensors, an evaluation and determination unit that evaluates and determines at least one of machine accuracy, work environment, and image accuracy based on the measurement results of the plurality of environmental elements, and a control unit that controls in-factory equipment so that an environment in the factory becomes a preset environment based on results of evaluation and determination by the evaluation and determination unit are included.

Systems and methods are disclosed for air flow optimization. In certain embodiments, the technology is a system comprising sensors, injectors, actuators, and a system processor. In order to optimize the air flow, the system processor directs the injectors to expel aerosol particles into an environment, such that the aerosol particles can be measured by the one or more sensors. Flow intensity map generation is then used to map the aerosol particles and air flow is changed to optimize aerosol particle concentration using the actuators.

Described is related to a dual function robotic cleaning device for removing harmful chemical pollutants, viruses, unpleasant odors as well as particulates from indoor air in addition to cleaning dust and debris from the ground or floors. The device has a floor cleaning unit and an indoor air purification unit integrated in the same body which can operate automatically according to indoor air pollution levels as well as by a user's instructions. The air purification unit consists of a virus zapping filter for eliminating airborne viruses, a chemical and odor filter for removing toxic chemical pollutants and unpleasant odors, a particulate filter for trapping PM2.5, and a chemical sensor for detecting chemical pollutant levels in indoor air, which feeds pollution values to the control unit of the device to trigger the air cleaning operation.