Variable airflow energy efficient HVAC systems can be used to provide for a three duct air supply, a multi-zone air supply, and a two duct air supply. The systems include an air handling unit that defines a cooling circuit portion and an independent heating/bypass circuit portion. The two circuit portions may each have variable air dampers for admitting variable amounts of ambient and return air, and/or the cooling circuit portion and the heating/bypass circuit portion may each have an active cooling element. Corresponding methods are also disclosed.

A method for providing personalized comfort to occupants of an environmentally conditioned space includes sensing a pre-adjustment pressure within a variable air volume diffuser, remotely adjusting a position an individually-adjustable directional outlet of the variable air volume diffuser, sensing a post-adjustment pressure within the variable air volume diffuser, and modifying the airflow through the variable air volume diffuser such that the post-adjustment pressure is equal to the pre-adjustment pressure. The variable air volume diffuser includes individually-adjustable directional outlets and a controller configured to regulate air pressure within the variable air volume diffuser when an individually adjustable directional outlet is adjusted. A user device in operative communication with the variable air volume diffuser includes a user interface to remotely adjust an adjustable directional outlet of the variable air volume diffuser to provide personalized comfort for the user. In embodiments, the variable air volume diffuser responds to spoken commands.

An air-conditioning system includes an outside air processing device, an air-conditioning device, and a control unit. The outside air processing device adjusts the temperature of outside air taken thereinto, and supplies the outside air to a plurality of indoor spaces. The air-conditioning device includes a plurality of indoor units at least one of which is installed in each of a plurality of target spaces that are some or all of the indoor spaces. The air-conditioning device adjusts the temperatures of air in the target spaces. The control unit adjusts the flow rate of air blown into each target space by the outside air processing device in accordance with an operating state of the at least one of the indoor units to reduce power consumption of the air-conditioning system.

A frame segment for a frame of a heating, ventilation, and/or air conditioning (HVAC) system includes a protrusion formed on an interior side of the frame segment and configured to engage with a first panel of the HVAC system, a first recess formed at an exterior side, opposite the interior side, of the frame segment, and a second recess formed at the exterior side of the frame segment. The first recess is configured to receive a second panel of the HVAC system, and the second recess is configured to receive a third panel of the HVAC system.

Aspects of the invention are directed towards a system and a method for performing calibration of variable air volume (VAV) units. One or more embodiments of the invention describe the method comprising steps of turning off a fan of an air handling unit and calibrating one or more airflow sensors associated with one or more reference variable air volume (VAV) units of the plurality of variable air volume (VAV) units using a step measure technique or using a value of airflow of the one or more supply ducts measured by an airflow sensor of the air handling unit or by an airflow sensor in the one or more supply ducts and determining a reference airflow value of the one or more reference VAV units. The method also describes a step of calibrating other airflow sensors associated with other variable air volume (VAV) units based on the reference airflow value.

A plurality of independent air conditioners, a first air conditioner (AC) (9a), a second AC (9b), and a third AC (9c), are disposed in an air conditioning room. Individual target temperatures of each habitable room that are acquired from an input/output terminal (19) and an outdoor temperature that is acquired by an outdoor temperature sensor (7) are input to a mode setter (32). Based on the individual target temperatures and the outdoor temperature, the mode setter (32) sets a cooling mode and a cooling setpoint temperature for operation in the cooling mode, or a heating mode and a heating setpoint temperature for operation in the heating mode, for each of the first AC (9a), the second AC (9b), and the third AC (9c).

A method and an arrangement for air-conditioning a cold aisle which is partially bounded by heat-generating devices and is arranged in a hot room, the hot room being separated from a second room by a boundary wall, and a region of the boundary wall is formed by a heat exchanger, such that air that is conveyed through the heat exchanger by the fan is supplied to the cold aisle. An opening with a fan is provided in the boundary wall. The cold aisle is connected to the boundary wall so that the opening is surrounded by the cold aisle.

Systems and methods for circulating air in an enclosed environment are disclosed. In some embodiments, the system includes an inlet to receive air from outside of the enclosed environment and an air handling unit coupled to the inlet and also configured to receive circulated air from the enclosed environment. The air handling unit can be configured to affect a temperature of at least one of the received outside air and the received circulated air. Based on the received outside air and the received circulated air, the air handling unit can be further configured to generate air for supplying to the enclosed environment.

In one embodiment, a housing system for a heating, ventilating, and air conditioning (HVAC) unit includes a rigid shell. The rigid shell includes a top panel, a front panel, and a rear panel. The HVAC unit also includes a bottom panel configured to be disposed within a first portion of a bottom plane of the HVAC unit, a first side panel, and a second side panel. The first side panel and the second side panel are each configured to be disposed within respective side planes of the HVAC unit and are each configured to be disposed within respective second portions of the bottom plane. The housing system is configured to be internally accessed through the respective side planes. Internal access of the housing system through either of the respective side planes is provided at least partially by rotation of the first side panel and/or the second side panel.

Embodiments of the present disclosure include methods and systems of circulating air in an enclosed environment. In such embodiments, the system may comprise an air handling unit (AHU), the AHU including an indoor air inlet to receive an indoor airflow from the enclosed environment and an indoor air outlet to expel the indoor airflow, a conditioning element arranged between the inlet and the outlet configured to at least heat or cool the indoor airflow as it flows thereover, one or more fan units arranged between the inlet and the outlet configured to provide velocity to the indoor airflow, and an air treatment assembly (ATA) arranged within or proximate the AHD, the ATA including an air inlet configured to receive a portion of the indoor airflow received by the AHU indoor air inlet.