An air conditioning system includes an air handling unit (AHU) configured to control outdoor air that is externally supplied, exhaust air that is discharged from indoors to outdoors, and return air that is circulated indoors and supplied again, control the outdoor air or mixed air of the return air and the outdoor air at a set temperature, and supply cool/warm supply air indoors, at least one outdoor unit configured to supply a refrigerant to the AHU, a controller configured to control the AHU through communication with the outdoor unit, and an interface unit configured to operate as an input/output unit of the controller. The interface unit displays setting menus for devices forming the AHU, sets basis data for controlling the devices in response to data received through the setting menus, inputs the set basis data to the controller, and outputs a control menu and a monitoring menu in accordance with functions of the AHU changed according to a configuration of the plurality of devices.

A signal processor receives signaling containing information about flow rates from sensorless converters in zone circulators in heating/cooling zones controlled by temperature sensors in a hydronic heating system in order to derive an adaptive pressure set point to meet the flow rates requested by the heating/cooling zones using an adaptive system and flow control curve equation, the signaling containing information about total flow rates requested by the zone circulators; determines desired pump speeds for the zone circulators to meet temperature requirements in heat zones; provides corresponding signaling containing information about the desired pump speeds; and/or determines the adaptive pump control curve equation based upon an adaptive system curve and as a moving maximum system flow rate depending on an adaptive pressure set point, a system flow rate requested by temperature loads, a minimum pressure at no flow, a control curve setting parameter, and an adaptive moving maximum flow and pressure.

A system having a mixed air box with inputs of return air from a space or spaces of a building, and of outside air. The mixed air box may have an output of discharge air to the space or spaces of the building. The air from the output may be return air that is conditioned with cooling, heat, or outside air. A damper may be situated at the input of outside air to the mixed air box. A temperature sensor may be positioned at the input for outside air and at the output of discharge air. A cooling mechanism may be at the output of the discharge air. The temperature sensor may be downstream from the cooling mechanism. An economizer may have connections with the damper, the temperature sensor and the cooling mechanism.

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.

An air conditioning ventilation system includes an air conditioner, a ventilator, and a control unit. The control unit controls operations of the air conditioner and the ventilator. The control unit causes the air conditioner to perform a compensation operation in order to compensate for a change in at least one of indoor temperature and humidity due to a ventilation operation prior to the ventilation operation to be performed by the ventilator.

The present invention provides a ventilation system for improving air quality of an indoor space. The system includes sensors for measuring PM2.5 particle level P, CO.sub.2 level C, and TVOC level T in the indoor space. A control circuit is configured to receive P, C and T values and generate an output signal Vout according to a specific algorithm, which in turn controls speed-variable EC motors that drive ventilating fans. The invention exhibits numerous technical merits such as lower energy consumption, programmable operation, high efficiency, and lower noise, among others.

An air conditioner having a projector and a method for controlling the same output an image to a display plate of the air conditioner and to the periphery of the air conditioner.

An HVAC system includes an evaporator coil and a metering device. The HVAC system includes a variable-speed circulation fan and a condenser coil fluidly coupled to the metering device. A variable-speed compressor is fluidly coupled to the condenser coil and the evaporator coil. A controller is operatively coupled to the variable-speed compressor and the variable-speed circulation fan. A second temperature sensor is disposed in an enclosed space. The second temperature sensor measures temperature of the enclosed space and transmits the temperature of the enclosed space to the controller. The controller determines if the temperature of the enclosed space is below a minimum threshold. Responsive to a determination that the temperature of the enclosed space is below the minimum threshold, the controller modulates at least one of a speed of the variable-speed compressor and the variable-speed circulation fan to lower a discharge air temperature.

An HVAC system includes an evaporator coil and a metering device fluidly coupled to the evaporator coil. The HVAC system also includes a variable-speed circulation fan and a condenser coil fluidly coupled to the metering device. The HVAC system also includes a variable-speed compressor fluidly coupled to the condenser coil and the evaporator coil and a controller operatively coupled to the variable-speed compressor and the variable-speed circulation fan. The controller is configured to measure a speed of the variable-speed compressor, calculate a normal cooling Cubic Feet per Minute (CFM), measure a speed of the variable-speed circulation fan, and determine if the speed of the variable-speed circulation fan exceeds the normal cooling CFM. If the speed of the variable-speed circulation fan exceeds the normal cooling CFM, the HVAC controller adjusts a speed of at least one of the variable-speed compressor and the variable-speed circulation fan.

A conditioning system includes a vapor compression system and a humidity control system. The vapor compression system includes an evaporator, a condenser, a first fan that produces a first airflow across the evaporator toward a conditioned interior space, and a second fan that produces a second airflow from the condenser toward an exterior space. The humidity control system includes a first mass exchange device positioned in the first airflow, a second mass exchange device positioned in the second airflow, and a heat exchanger in fluid communication with both mass exchange devices. The heat exchanger includes a first path and a second path that are thermally coupled and that provide liquid desiccant between the first and second mass exchange devices. The first and second mass exchange devices each include a plurality of cavities configured to permit liquid desiccant to flow therethrough.