Systems and methods are configured to control operation of an HVAC system providing climate control for a zone of a structure. In various embodiments, a constrained optimization problem is performed to set control commands for controlling operation of the HVAC system to achieve one or more objectives while providing a supply air flow at an air temperature and a humidity ratio for the zone at a future time. For instance, the optimization problem may include a cost function having constraints based on a desired temperature setpoint and a humidity ratio for the zone. A value is set for each control command based on the performance of the constrained optimization problem to achieve at least one of the objectives and as a result, the supply air flow at the air temperature and humidity ratio is provided by the HVAC system at the future time to the zone based on the values.

An air-conditioning system includes an air-conditioning unit for supplying conditioned aft to an activity space defined by a compartment and having an air-conditioning duct for guiding the conditioned aft to the activity space, and at least one auxiliary air duct mechanism including an auxiliary air duct communicatingly connected to the air-conditioning duct for communicating the activity space with the outside, and a fan mounted in the auxiliary air duct. The auxiliary air duct has an auxiliary air inlet for guiding therein the outside air, an inner air inlet opening for guiding therein the conditioned air, and an auxiliary air outlet for discharging the outside air and the conditioned air into the activity space.

Air conditioner units and methods of operating the same are provided. A method of operating an air conditioner unit includes activating a makeup air system of the air conditioner unit. The makeup air system directs a flow of outside air from the makeup air system to an indoor portion of a housing of the air conditioner unit. The method also includes activating an indoor fan disposed in the indoor portion of the air conditioner unit at a fan speed at least equal to a minimum circulation threshold speed in response to the makeup air system being activated. Activating the indoor fan causes the flow of outside air from the makeup air system to be urged through the indoor portion of the housing. An air conditioner unit may include a controller, and the controller may be configured for performing the method.

Disclosed is a window air conditioner having a constant temperature dehumidification mode. A first indoor heat exchanger and a second indoor heat exchanger of the air conditioner are stacked in an air inlet direction of an indoor air duct of the air conditioner. In the constant temperature dehumidification mode, one of the indoor heat exchangers is configured to be in a heating mode, and the other one is configured to be in a cooling mode. In this way, both fresh air and indoor air may be dehumidified and heated, a user may feel the fresh air and the temperature of the dehumidified air is comfortable.

Disclose are a wall-mounted air conditioning indoor unit and an air conditioner. The wall-mounted air conditioning indoor unit includes: an indoor unit body; a fresh air module including a housing, the housing being provided with a fresh air inlet, a fresh air outlet, and a fresh air duct communicating the fresh air inlet with the fresh air outlet, the fresh air inlet being configured to communicated with the outdoor environment, and the fresh air outlet being communicated with an air inlet of the indoor unit body; a wind wheel installed in the fresh air duct; and a valve installed at the fresh air inlet to open or close the fresh air inlet.

A ventilation unit is for ventilating an indoor space, and incorporates an air cleaning device and mechanical restrictor for controlling a restriction to a flow resulting from a pressure differential across the unit. There is determination of the inside and outside air pressures in the vicinity of the unit and of air quality parameters inside and outside. The air cleaning device and the mechanical restrictor are controlled in dependence on the determined air pressures and air quality parameters. This provides a fan-less, and hence low-power ventilation unit, which relies on throttling the natural air flow across the unit to provide flow control, and hence enable control of air quality. The air cleaning device may be operated only when the flow is into the inside space, saving power.

A fresh air distribution system designed for PTAC use, the system comprising a first upwardly directed air distribution duct configured to receive a stream of pressurized fresh air discharged from a fresh air blower apparatus and to redirect the stream into a transversely extending second air distribution duct communicating with the first air distribution duct, the second air distribution duct comprising a plurality of laterally spaced baffles angularly disposed inside the duct that divide and redirect the stream into an inside plenum of the PTAC to be combined with recirculated in-room air.

An isolation chamber includes a plurality of walls and ceiling defining an internal chamber and a first and second door. The doors seal engagement with the walls. A fan filter unit is arranged to extract air from the internal chamber. The isolation chamber is arranged to couple to a doorway, and the coupling arranged to provide an airtight seal about the doorway.

A cooling system includes a cooling device having a first cooling coil and a second cooling coil, a first heat transfer fluid in fluid communication with the first cooling coil, a second heat transfer fluid in fluid communication with the second cooling coil, a first heat exchanger in fluid communication with the first heat transfer fluid and the second heat transfer fluid, a second heat exchanger in fluid communication with the second heat transfer fluid and a source of external air, a system of fluid control devices in fluid communication with the second heat transfer fluid and configured to minimize a change in a total pressure drop of the second heat transfer fluid when the cooling system switches between operating modes, and a controller configured to selectively control the cooling device and the system of fluid control devices to operate the cooling system in each of the operating modes.

An autonomous device for measuring at least one characteristic of a fluid circulating in a conduit in a flow direction comprises a permanent magnetic field source, a magneto-electric converter and a processing circuit capable of using the electric charges supplied by the converter to supply a measurement of a characteristic of its environment. The source and the converter are placed in a stator and a rotor forming the device. The autonomous device further comprises attachment means allowing the stator to be fixedly placed in the conduit or at one end of the conduit, in a configuration in which the axis of rotation of the rotor is parallel to the flow direction. A control system may employ at least one such autonomous device.