A heat recovery ventilator (HRV) and/or energy recovery ventilator (ERV) that integrates with a residential capacity air handling unit (AHU) is embodied in a small footprint HRV or ERV unit that connects directly to the return side of an AHU and to outdoor air inlet and exhaust ducts. The ventilator includes a control system incorporating a processor and sensors that control the operation of the system to provide desired ventilation flow rates under varying conditions.

An air-conditioner includes: a return-air inlet and a supply-air outlet each communicating with a predetermined space; a first main air channel configured to allow air to flow therein towards the supply-air outlet; a first heat exchanger disposed in the first main air channel and that causes heat-exchange between refrigerant flowing therein and air passing therethrough; an exhaust-air outlet communicating with an outside of the predetermined space; a second main air channel configured to allow air to flow therein towards the exhaust-air outlet; a second heat exchanger disposed in the second main air channel and that causes heat-exchange between refrigerant flowing therein and air passing therethrough; and an exhaust ventilation channel configured to allow air to flow therein from the return-air inlet towards the exhaust-air outlet.

A control unit determines, on the basis of a temperature and humidity detected by sensors, whether outdoor air cooling that takes outdoor air into a room is effective. Upon determination that the outdoor air cooling is effective, the control unit opens a damper and causes stoppage of an air supply fan disposed in an air supply path. Due to such operation, indoor air passing through an air discharge path bypasses a total heat exchanger by passing through a bypass air path, and thereby is discharged to the outdoors as exhaust air. However, due to stoppage of the air supply fan, although the outdoor air does not flow through the air supply path, the outdoor air flows into a building from an opening of the building.

Systems and methods for providing dehumidification to an enclosed space can include a dehumidification unit in a supply air plenum that receives return air and a regeneration unit in a scavenger air plenum that receives outdoor air. The system can operate in a wet mode and a dry mode, depending on outdoor air conditions and a relative humidity setpoint for the enclosed space. The dehumidification unit and regeneration unit are both operational in the wet mode to dehumidify the return air and regenerate dilute desiccant. In the dry mode, the dehumidification unit and regeneration unit are not needed, and dry outdoor air can be supplied to the enclosed space. A heat recovery system utilizes waste heat from either return air or scavenger air, depending on the operating mode, to heat the outdoor air before it is supplied to the enclosed space or before it is used for regenerating desiccant.

An air handler includes a housing with a heat exchanger core. The housing includes a faceplate, a roof panel, a base panel, a first side panel, and a second side panel. A first tunnel and a second tunnel are connected to the housing at the faceplate. A septum protrudes from the faceplate and connects the core at a front edge. The air handler further includes a first recirculation path and a second recirculation path inside the housing. The first and second recirculation paths are defined by the septum, the housing, and the core. The first and second recirculation paths are configured to direct a portion of airflow from the first tunnel to the second tunnel. The air handler further includes a first damper and a second damper disposed on the faceplate and configured to obstruct the first recirculation path and the second recirculation path respectively.

A single-package air conditioner unit may include a housing, an outdoor heat exchanger assembly, an indoor heat exchanger assembly, a compressor, and a plenum. The housing may define an outdoor portion and an indoor portion. The plenum may be attached to the housing and receivable within a wall channel defined by a structure wall. The plenum may define a primary air channel and a make-up air (MUA) inlet in fluid parallel with the primary air channel. The primary air channel may be disposed in fluid communication with the outdoor portion to permit air therebetween. The MUA inlet may be in fluid communication with the indoor portion to permit air thereto.

A closure unit for a ventilation device having at least two pivotally arranged flaps for closing a respective ventilation channel. The two flaps can be moved by a common shaft which defines a pivot axis. The two flaps are thus positively coupled and can be actuated simultaneously by a single motor. The closure unit allows the use of two heat exchangers operated in parallel without an additional bypass channel.

A heating, ventilation, and/or air conditioning (HVAC) unit may include a supply fan section having a supply fan disposed therein to force a supply air flow through a discharge plenum of the HVAC unit. The HVAC unit may also include an economizer positioned adjacent the supply fan section to receive an outdoor air flow and direct the outdoor air flow into the supply fan section.

An air conditioning system includes: an air conditioner that generates conditioned air by heat exchange with a refrigerant and supplies the conditioned air to an air conditioning target space; a refrigerant sensor that detects refrigerant leakage; a ventilator that ventilates the air conditioning target space; and a controller. The ventilator includes: a total heat exchanger; a first air supply path and a first air exhaust path that connect the air conditioning target space and an outside of the air conditioning target space via the total heat exchanger; a second air supply path that connect the air conditioning target space and the outside of the air conditioning target space without passing through the total heat exchanger; an air supply fan that supplies air from the outside of the air conditioning target space into the air conditioning target space via the first air supply path and the second air supply path.

The present invention relates to a decentralized hybrid ventilation. The ventilation system comprises a housing having an inlet channel and an outlet channel. A first fan is arranged in the inlet channel for providing an airflow into the room and a second fan is arranged in the outlet channel for providing an airflow out of the room. A heat exchanger and filters are arranged in said channels for exchanging heat between and for filtrating air flowing into the room and air flowing out of the room. Furthermore, the ventilation system comprises a first and a second service door each providing, when open, an opening between the room and one of said channels to diverge the airflow from primarily flowing through the air filters and/or heat exchanger. The ventilation system also comprises a control system configured for switching between different modes of operations.