A ventilation system with automatic flow balancing derived from a neural network to consistently achieve a desired flow rate for inlet flow and/or outlet flow in various operating environments to optimize system performance. The system includes a ventilation device that includes an exhaust blower assembly with a blower motor and a control circuit having a mathematical equation that determines an estimated exhaust blower flow based upon select inputs. The ventilation device also includes a supply blower assembly with a blower motor and control circuit having a mathematical equation that determines an estimated supply blower flow based upon select inputs. When the estimated exhaust blower flow is different than an exhaust flow set point, the exhaust control circuit selectively alters power supplied to the exhaust motor. When the estimated supply blower flow is different than a supply flow set point, the supply control circuit selectively alters power supplied to the supply motor.

A heat exchange exhaust system for a clothes dryer, comprising an inner exhaust air conduit, an outer air supply conduit concentric with and external to the inner exhaust air conduit; a plurality of radial fins for maintaining a volume between the inner exhaust conduit and the external supply conduit; sealing means for sealing the back perimeter of the clothes dryer to an adjacent wall; and an air supply plenum within the adjacent wall from which the inner exhaust air conduit and outer air supply conduit connect to an external building wall. All incoming supply air may be drawn from the exterior and all exhaust air may be exhausted to the exterior. The supply air and exhaust air are physically separated. Heat energy in the exhaust air is transferred from the outgoing exhaust air to the incoming air supply to preheat the incoming air supply and cool the exhaust air.

A heat pump cycle includes a compressor, a heat exchanger, a gas-liquid separator, and an outdoor heat exchanger. The heat pump cycle includes a main circuit connecting the compressor, the heat exchanger, the gas-liquid separator, and the outdoor heat exchanger such that refrigerant flows therethrough. The heat pump cycle includes an exhaust-heat recovery heat exchanger, and an exhaust-heat recovery circuit forming a flow path leading to the compressor not through the outdoor heat exchanger but through the exhaust-heat recovery heat exchanger. The heat pump cycle includes an expansion valve that is disposed upstream of the exhaust-heat recovery heat exchanger in the exhaust-heat recovery circuit and expands the refrigerant such that the refrigerant changes from liquid phase to gas phase in the exhaust-heat recovery heat exchanger.

The cooling system according to the present invention may dehumidify and cool the indoor air by using the ejector, the ejector membrane, the evaporation chamber, and the indoor dehumidifying membrane. In addition, the coefficient of performance of the cooling system may be improved by cooling the refrigerant using evaporation latent heat generated in the evaporation chamber by the suction force of the ejector and cooling the indoor air using the refrigerant. In addition, by using solar heat to generate high-temperature and high-pressure steam and supply the generated steam to the ejector, energy use efficiency may be improved. In addition, since the temperature of the steam generated in the steam generating portion may be lowered by arranging and using the two first and second ejectors in multiple stages, energy efficiency may be further improved by reducing the consumption of the heat source required for steam generation.

A ventilation system in accordance with the present disclosure includes a housing and a core unit arranged in the housing. A fresh air inlet, an exhaust air inlet, a fresh air outlet, and an exhaust air outlet are arranged on the housing. The core unit is arranged between the inlets and outlets to transfer heat and/or humidity between fresh air and exhaust air flowing through the ventilation system. The exhaust air flows through ducting to an exhaust port in a wall of a building structure.

A heat and humidity exchanger comprises panels made up of membrane sheets attached on either side of a separator. Channels extend across each panel between the separator and the membrane sheets. The panels are much stiffer than the membrane sheets. Panels are stacked in a spaced apart relationship to provide an ERV core. Spacing between adjacent panels may be smaller than a thickness of the panels,

A smart air conditioner for reduction in fine dust and harmful gas includes: an eternal chamber including a first side coupled to communicate with an interior and a second side communicating with an exterior; an internal chamber disposed to pass through an inside of the external chamber and including a first side coupled to communicate with an interior and a second side communicating with an exterior; an external chamber damper installed in the external chamber and controlling air flow; and an internal chamber damper installed in the internal chamber and controlling air flow.

A heating, ventilation, and air conditioning (HVAC) system for a structure having at least one area to be conditioned includes a blower configured to force an airflow through the HVAC system and a duct assembly in airflow communication with the blower. The duct assembly includes a first duct defining a flow path for a first fluid having a first temperature and a second duct having a hollow interior defining a flow path for a second fluid having a second temperature different from the first temperature. The first duct is arranged within the hollow interior of the second duct such that heat is transferred between the first fluid and the second fluid. At least one of the first duct and the second duct is formed from a collapsible material.

A ventilator comprising a housing, a first flowpath extending from a first inlet to a first outlet and a second flowpath extending from a second inlet to a second outlet, wherein the housing comprises a partition defining a first chamber and a second chamber therein, and wherein the first flowpath extends through both the first and second chamber and the second flowpath extends through at least one of the first chamber or second chamber; a first movable damper disposed in the first flowpath and configured to apportion an amount of a first fluid flowing therein between the first chamber and the second chamber; and a first recovery core comprising a plurality of first passageways and a plurality of second passageways disposed in the first chamber such that the plurality of first passageways fluidly communication with the first flowpath and the plurality of second passageways fluidly communication with the second flowpath.

An energy recovery ventilation device includes a housing having a first side, a second side opposite the first side. The device also includes at least one first channel within the housing, and at least one second channel within the housing. The device includes a first inlet and a first outlet. The first inlet is fluidly coupled to the first outlet via the first channel. The device also includes a second inlet and a second outlet. The second inlet is fluidly coupled to the second outlet via the second channel. The device includes a first cover supported by the first side of the housing. The first cover is made of a first material. The device also includes a second cover supported by the second side of the housing. The second cover is made of a second material that is different than the first material.