A system and a method for operating an air handling unit (AHU) at an effective static pressure setpoint in a HVAC system. The method includes receiving airflow setpoint values from each of a plurality of variable air volume (VAV) units to determine a combined airflow set point for the plurality of VAV units of an air handling unit (AHU). The method also includes determining an effective static pressure setpoint for the AHU based on a relation between the combined airflow setpoint value and a static pressure represented by a system effect curve.

This air-conditioning system includes an air conditioner: a room temperature sensor; an air-conditioning room temperature sensor; and a system controller. In the system controller, a room target temperature obtainer obtains a plurality of room target temperatures. Moreover, a ventilation airflow determiner determines the ventilation airflow of each of the delivery fans on the basis of the room target temperature, the temperature in the corresponding room, and the temperature in the air-conditioning room, and a fan airflow controller controls the ventilation airflow of each of the delivery fans according to the ventilation airflow determined by the ventilation airflow determiner.

A terminal unit is provided for cooling a conditioned space. The terminal unit is provided conditioned air and augments cooling with a local heat exchanger. The terminal unit controls the flow of coolant through the heat exchanger. Latent cooling provided by the conditioned air is augmented by allowing moisture accumulation on the heat exchanger. The terminal unit lacks a drainage system so deleterious moisture accumulation (e.g., dripping) is avoided by monitoring moisture accumulation and controlling the terminal unit accordingly. If the moisture accumulation is below a threshold, the terminal unit is permitted to provide latent cooling locally. If the moisture accumulation is above a threshold, the terminal unit prevents further local latent cooling. Some sensor configurations allow for calculation of air flow rates, the latent cooling rate, and moisture accumulation. This information is used to achieve the desired room conditions more rapidly and precisely.

An air treatment system controls airflow volume in accordance with momentarily varying airflow volume to be demanded. A supply fan unit is disposed separately from an air treatment unit, and sends outdoor air from an outdoor space to the air treatment unit and sends outdoor air treated by the air treatment unit to an indoor space. An exhaust fan unit is disposed separately from the air treatment unit, and sends indoor air from the indoor space to the air treatment unit and sends indoor air treated by the air treatment unit to the outdoor space. A controller controls a rotation speed of a first fan in accordance with a first detection value of a first airflow volume detection unit, and controls a rotation speed of a second fan in accordance with a second detection value of a second airflow volume detection unit.

Provided is an air conditioning system that uses ducts to supply conditioned air to a plurality of places inside a building, and is configured to counteract air backflow that occurs in ducts. A heat exchanger unit includes a use side heat exchanger. A plurality of ducts are connected to the heat exchanger unit. A plurality of fan units suction conditioned air from the heat exchanger unit, and supply the conditioned air to a plurality of air outlets through the plurality of ducts. A differential pressure sensor acting as a detector detects air backflow proceeding from at least one air outlet among the plurality of air outlets toward the heat exchanger unit in a plurality of distribution flow paths including the plurality of ducts, the plurality of fan units, and the air outlets of a plurality of outlet units.

An air conditioning system includes an outdoor air latent cooling treatment stage providing parallel airflow with a return air sensible cooling treatment stage. A mixer mixes the treated outdoor air with the return air to form the conditioned space supply air. A first relative humidity controller monitors the outdoor air relative humidity and separates the outdoor air from saturation to maintain relative humidity in outdoor air ducting below a predetermined mould growth limit. A second relative humidity controller monitors the conditioned space supply air relative humidity and separates the space supply air from saturation to maintain relative humidity in space supply air ducting below a predetermined mould growth limit. The outdoor air latent cooling treatment stage includes a dehumidification heat exchanger, combination pre-cooling and heat reclaim heat exchangers, or a heat transfer pump. The return air sensible cooling treatment stage includes at least a sensible cooling heat exchanger.

A cooling system utilizes an organic ionic salt composition for dehumidification of an airflow. The organic ionic salt composition absorbs moisture from an inlet airflow to produce an outlet airflow with a reduce moisture from that of the inlet airflow. The organic ionic salt composition may be regenerated, wherein the absorbed moisture is expelled by heating with a heating device. The heating device may be an electrochemical heating device, such as a fuel cell, an electrochemical metal hydride heating device, an electrochemical heat pump or compressor, or a condenser of a refrigerant cycle, which may utilize an electrochemical pump or compressor. The efficiency of the cooling system may be increased by utilization of the waste heat the cooling system. The organic ionic salt composition may circulate back and forth or in a loop between a conditioner, where it absorbs moisture, to a regenerator, where moisture is desorbed by heating.

An air-conditioning system includes an outside air conditioning device, an air conditioning device, and a machine learning apparatus, and includes a state variable acquiring unit configured to acquire state variables, a learning unit configured to perform learning by associating the state variables with at least either an operating capacity of the outside air conditioning device or an operating capacity of the air conditioning device, and a reward calculating unit configured to calculate a reward that correlates with a total of energy consumption of the outside air conditioning device and energy consumption of the air conditioning device. The learning unit performs the learning by using the reward calculated in a period determined in accordance with a time duration until the total of the energy consumption changes after at least either the operating capacity of the outside air conditioning device or the operating capacity of the air conditioning device has changed.

A system for fault detection and diagnostics of equipment. The system may also be capable of disaggregation and/or virtual submetering of energy consumption by equipment, such as that of heating, ventilation and air conditioning, lighting, and so forth, in a building. Vibration and current sensors, along with one or more algorithms, may be utilized for fault detection and diagnostics of equipment. Models may be developed to aid in deducing energy consumption of individual components of equipment, and the like, for a building.

An airflow sterilizing unit configured to airflow in a heating, ventilation, and air conditioning (HVAC) system is disclosed. The airflow sterilizing unit includes a portion of a duct at least partially lined with an ultraviolet (UV) reflective material, a plurality of hollow structures positioned within the portion of the duct, each comprising an external UV reflective surface, and at least one array of UV light emitting diodes (LEDs) mounted on a surface of at least one of the plurality of hollow structures. The sterilizing unit is configured to replace a section of an existing duct in the HVAC system such that air within the HVAC system passes through the sterilizing unit before exiting from one or more vent.