One or more sections of a ventilated wall are provided around an outdoor space is not enclosed with a ceiling to form a fenced enclosure. Cooled air at a temperature colder than ambient temperature is supplied into the fenced enclosure through perforations in the wall and/or from an air-conditioned building adjacent to the fenced enclosure at displacement velocity to avoid disrupting stratification of air inside of the fenced enclosure. The cooled air pools inside of the fenced enclosure providing cooling for outdoor activities such as al fresco dining.

There is provided an air conditioning system that can reduce a power consumption while maintaining constant temperature controlling capability. To this end, a water air conditioning system includes a heat source unit to cool water, a utilization heat exchanger to exchange heat between air and the water cooled by the heat source unit, a secondary pump to cause the water to flow in the utilization heat exchanger, a water temperature sensor to detect a temperature of the water cooled by the heat source unit, and airflow volume changing means to increase an airflow volume of the air passing through the utilization heat exchanger when the temperature of the water cooled by the heat source unit becomes higher.

Control systems are provided that provide thermodynamically decoupled control of temperature and relative humidity and/or reduce or prevent frost formation or remove previously-formed frost. The control systems herein may be included as a component of a heating, ventilation, air conditioning, and refrigeration system that includes a heat exchanger.

A method to predict the lifespan of an air filter including providing pressure sensors in a device having an air filter and a fan to drive air through the air filter, one pressure sensor located on an intake side of the fan and one pressure sensor located on an outflow side of the fan, periodically calculating a static pressure drop across the fan, storing the static pressure drop daily; calculating an average pressure drop, calculating a cumulative particle loading on the filter, comparing the cumulative particle loading with a pre-determined maximum particle loading for the filter, and determining if the filter needs to be changed is provided.

A method of an air conditioner is disclosed. The method of controlling an air conditioner of the present disclosure including at least one outdoor unit; and a plurality of indoor units connected to the outdoor unit and provided with a vane for adjusting a wind direction, the method includes classifying indoor units for each indoor space by comparing an air temperature distribution for each time of each indoor unit detected by a first temperature sensor that detects an air temperature of indoor unit.

The present disclosure relates to a method of controlling an air conditioner. The method of controlling the air conditioner of the present disclosure includes collecting indoor unit data during a time period from when an indoor unit is ON to when the indoor unit is OFF; and correcting clusters based on changes in the clusters which are matched based on the collected data, thereby accurately determining a state of an indoor space by changing the plurality of clusters according to an environment on site.

The present disclosure relates to a method of controlling an air conditioner. The method of controlling the air conditioner of the present disclosure includes: collecting indoor unit data of each of a plurality of indoor units connected to an outdoor unit; controlling a total flow rate of refrigerant supplied to the plurality of indoor units based on a total load of the indoor units, which is determined based on the indoor unit data of the respective indoor units; and controlling an individual flow rate of refrigerant flowing to the respective indoor units based on clusters of the respective indoor units which are matched based on the indoor unit data of the respective indoor units.

A method of controlling an air conditioner is disclosed. The method of controlling an air conditioner of the present disclosure includes an outdoor unit; and a plurality of indoor units respectively comprising a vane connected to the outdoor unit and adjusting a wind direction, and a fan for forming an air flow, the method comprising: detecting an indoor temperature of each of the plurality of indoor units through a temperature sensor disposed in each of the plurality of indoor units; specifying an indoor unit having a temperature imbalance as a target indoor unit based on the indoor temperature of each of the plurality of indoor units detected through the temperature sensor; specifying indoor units adjacent to the target indoor unit as a support indoor unit; and performing a support operation for resolving a temperature imbalance of the target indoor unit by adjusting a vane and a fan of the support indoor unit.

A heating, ventilation, and/or air conditioning (HVAC) system includes a set of electrical switches and a controller configured to determine a calibration value of an operating parameter of the HVAC system based on a plurality of configurations of the set of electrical switches during operation of the HVAC system in a calibration mode, receive a measured value of the operating parameter from a sensor of the HVAC system during the operation of the HVAC system in the calibration mode, and determine a parameter value adjustment for the measured value based on a comparison of the measured value and the calibration value.

The method to control cleanroom conditions, including zone particle concentration, occupancy status, and heating, ventilation, and air conditioning (HVAC) system conditions, includes detecting a zone particle concentration, an occupancy status, and HVAC system conditions. The cleanroom includes the HVAC system in communication with the zone of the cleanroom and with a computer processor as a control unit of the cleanroom. The zone particle concentration, the occupancy status, and the HVAC system conditions are communicated to the computer processor, and a desired zone particle concentration is determined based on a range of desired HVAC system conditions with model predictive control. A first control signal to the HVAC system based on the occupancy status, the zone particle concentration, and the desired zone particle concentration is determined. The first control signal is communicated to the HVAC system, and the HVAC system activates according to the first control signal.