The invention relates to a heating, ventilation and/or air conditioning device for a motor vehicle, having an air inlet box with a plurality of walls and a spiral box arranged downstream of the air inlet box with respect to the flow of an air flow. The air inlet box further includes at least one first air inlet for the entry of a first air flow and at least one second air inlet for the entry of a second air flow. The air inlet box has a first internal duct made of porous material arranged to connect the first air inlet to the inlet of the spiral box.

A centrifugal fan includes first blades and second blades connected via a separation plate. A side plate supports the first blades located on one side in an axial direction, and a main plate supports the second blades on the other side in the axial direction. The separation plate has an inner diameter larger than or equal to an outer diameter of the main plate and larger than or equal to a largest inner diameter of the second blade. The separation plate has an outer diameter smaller than or equal to an inner diameter of the side plate and smaller than or equal to a smallest outer diameter of the first blade.

An air-conditioning apparatus for a vehicle and a control method of the same are provided to inhibit a closing degree of a door in closing the door from being insufficient, secure high quietness in a vehicle cabin immediately after the door is closed, and lower energy consumption of the vehicle. An air-conditioning apparatus for a vehicle includes an inside-outside air switching damper including a damper switching actuator, an air-conditioning control switch, a control unit, and door opening-and-closing sensors. The control unit includes two timers and a memory. When an IG switch is in an OFF state, the control unit sets the inside-outside air switching damper to an intermediate mode when the door becomes an open state, thereafter sequentially starts the timers when the door becomes a closed state, and returns the inside-outside air switching damper to a previous state to opening of the door after waiting until the timers expire.

A work machine, such as a skid steer loader or a compact track loader, includes an air intake assembly for a heating, ventilation, and air conditioning (HVAC) unit. A conduit integrated into a structure supporting a roof over an operator cab accepts air and water from the atmosphere through an air inlet proximate the roof. A debris outlet downstream in the conduit allows gravity to return the water to the environment. Between the air inlet and the debris outlet, an orifice in the conduit connects to an air duct through which the air may be diverted by suction from the HVAC unit. An air filter at the end of the air duct removes remaining particulates from the air prior to conditioning by the HVAC unit. Sizing the cross-sectional areas of the air path to exceed a cross-sectional area of an inlet to the air filter and providing a substantially straight air path avoids resistance to air flow, resulting in efficient intake of cleaner air.

Various disclosed embodiments include illustrative heating, ventilation, and air conditioning (HVAC) devices, HVAC systems, vehicles, and methods. An illustrative HVAC system includes a case configured to at least partially recirculate air within the case, a blower disposed in the case and configured to cause air to flow, a first heat exchanger disposed in the case and configured to heat the air, and a second heat exchanger disposed in the case and configured to exchange heat with the air.

Methods and systems are provided for a vehicle air duct. In one example, a system for a vehicle, includes a passage comprising an inlet at a downstream portion of a front wheel well of the vehicle and an outlet upstream of a rear wheel well of the vehicle.

The present invention relates to a vehicle air conditioner and, more specifically, to a vehicle air conditioner which supplies, to a variable heat exchanger, condensate water and air, that have been blown by means of a supply part and passed through an evaporator, so as to enable sub-cooling and overall performance of the variable heat exchanger to be improved during cooling, thereby further increasing cooling performance, and which may use air and condensate water as a heat-absorbing heat source during heating so as to further increase the heat absorption amount of the variable heat exchanger, so that heating performance may be further increased, and thus overall power consumption for air conditioning may be reduced and an increase in heat pump system performance may be promoted.

A blower device includes a centrifugal fan that sucks air from one side of the blower device in an axial direction, and an air flow guide disposed between the centrifugal fan and the other side of the blower device in the axial direction. A first air flow from the centrifugal fan is bent toward the other side in the axial direction. A second air flow from the centrifugal fan is bent toward the other side in the axial direction, and then bent inward in the radial direction. A ratio of a pressure loss in the second air flow to a pressure loss in the first air flow before a downstream end of the air flow guide is smaller than a ratio of a pressure loss in the second air flow to a pressure loss in the first air flow before an upstream end of the air flow guide.

There is disclosed an environmental control system for thermally conditioning air within an enclosed space comprising: a refrigerant circuit having a compressor, an indoor heat exchanger, an expansion device, and an outdoor heat exchanger. The system further comprises an intake flowpath for directing an intake flow of fresh air to the enclosed space, wherein a heat-transfer section of the indoor heat exchanger is located within the intake flowpath to thermally condition the intake flow of fresh air before entering the enclosed space. The system further comprises an exhaust flowpath for directing an exhaust flow of thermally conditioned air to an external environment. A recovery heat exchanger is provided to transfer thermal energy between the exhaust flow and the intake flow at a location within the intake flowpath that is upstream of the heat-transfer section of the indoor heat exchanger.

A blower of an HVAC system includes an air inlet, an air outlet, a blower wheel with blades, a motor operable to cause the blower wheel to rotate, and a blower housing within which the blower wheel is positioned. The blower housing includes a top panel, a bottom panel, and a connecting panel. The top panel and the bottom panel are connected to the connecting panel. The top panel includes a curved edge extending from a bottom edge of the connecting panel to a top edge of the connecting panel. An expansion angle of the curved edge of the top panel changes as a function of position along the curved edge of the top panel. The bottom panel may have a shape corresponding to a mirror image to that of the top panel.