A door unit for an air conditioning system includes a stationary inner screen part, an outer casing part rotatable between different operational positions in relation to the inner screen part, and a flap member attached to the outer casing part. The outer casing part includes first and second inlet openings. The door unit directs a first flow of air in a first air flow channel and a second flow of air in a second air flow channel to a third air flow channel or to the third air flow channel and a fourth air flow channel. The flap member blocks the first air flow channel or the second air flow channel, wherein an internal volume of the door unit enclosed by the inner screen part and the outer casing part forms the fourth air flow channel.

Provided are a defrosting control device, an air conditioner and a defrosting control method therefor. The device includes an airbag device, wherein the airbag device includes a mounting support (1), an airbag (2) and an inflation mechanism. When an air conditioner to be controlled enters a defrosting mode, the inflation mechanism inflates the airbag (2) such that same forms an airbag layer to isolate an outdoor heat exchanger of the air conditioner to be controlled from flowing air outside the outdoor heat exchanger. The defrosting control device can achieve the beneficial effects of a small defrosting heat loss, a good defrosting effect and a good user experience.

A frost suppression device for vehicles includes a grill shutter disposed in front of an outdoor heat exchanger for heating the cabin of the vehicle, a shutter control unit for controlling opening and shutting of the grill shutter, and a weather information obtaining unit for obtaining weather information containing change over time in predicted outside air temperature at the current position of the vehicle. The shutter control unit makes a prediction about frost formation to predict whether the outdoor heat exchanger may be frosted, based on the predicted outside air temperature, when the vehicle is first parked. The prediction about frost formation predicts that frost formation on the outdoor heat exchanger may begin at a time when the predicted outside air temperature becomes equal to or below a predetermined temperature. The shutter control unit shuts the grill shutter before a predicted frosting time.

A frost suppression device for vehicles includes a grill shutter disposed in front of an outdoor heat exchanger for heating the cabin of the vehicle, a shutter control unit for controlling opening and shutting of the grill shutter, and a weather information obtaining unit for obtaining weather information containing change over time in predicted outside air temperature at the current position of the vehicle. The shutter control unit makes a prediction about frost formation to predict whether the outdoor heat exchanger may be frosted, based on the predicted outside air temperature, when the vehicle is first parked. The prediction about frost formation predicts that frost formation on the outdoor heat exchanger may begin at a time when the predicted outside air temperature becomes equal to or below a predetermined temperature. The shutter control unit shuts the grill shutter before a predicted frosting time.

A forced air handling system includes an automated monitoring system. A method of operating the automated monitoring system includes initiating a calibration mode of operation via a controller. A plurality of dampers may then close via the controller. Once closed, a duct in communication with the plurality of dampers may be pressurized. A first air flow measuring exiting each one of the plurality of dampers may be obtained by a flow sensor. The duct is then depressurized and a second airflow measurement is taken, via the controller, exiting each one of the plurality of dampers. The controller calculates a statistical difference between the first and second airflow measurements.

A forced air handling system includes an automated monitoring system. A method of operating the automated monitoring system includes initiating a calibration mode of operation via a controller. A plurality of dampers may then close via the controller. Once closed, a duct in communication with the plurality of dampers may be pressurized. A first air flow measuring exiting each one of the plurality of dampers may be obtained by a flow sensor. The duct is then depressurized and a second airflow measurement is taken, via the controller, exiting each one of the plurality of dampers. The controller calculates a statistical difference between the first and second airflow measurements.

A motor vehicle air-conditioning line valve arrangement includes a line valve having an air-conditioning line body which is of substantially closed design in a transverse plane, and a fiber nonwoven arranged on an inside in the air-conditioning line body and having a nonwoven mat to which a large number of nonwoven fibers are fixed. The nonwoven fibers are fixed to the nonwoven mat at one end and configured to be electrostatically charged by the nonwoven mat. An electrical charge generator is electrically connected to the nonwoven mat and configured to electrostatically charge the fiber nonwoven, so that the electrostatically charged nonwoven fibers straighten toward a center of the air-conditioning line body in such a way that they close an open flow cross section of the air-conditioning line body.

A motor vehicle air-conditioning line valve arrangement includes a line valve having an air-conditioning line body which is of substantially closed design in a transverse plane, and a fiber nonwoven arranged on an inside in the air-conditioning line body and having a nonwoven mat to which a large number of nonwoven fibers are fixed. The nonwoven fibers are fixed to the nonwoven mat at one end and configured to be electrostatically charged by the nonwoven mat. An electrical charge generator is electrically connected to the nonwoven mat and configured to electrostatically charge the fiber nonwoven, so that the electrostatically charged nonwoven fibers straighten toward a center of the air-conditioning line body in such a way that they close an open flow cross section of the air-conditioning line body.

An air-conditioning indoor unit and an air conditioner are provided. The indoor unit has a surface frame, a breezeless member, an outer deflector, a heat exchanger, and a fan. The surface frame has a first air outlet defined on a front lower part of the surface frame. The first air outlet penetrates a front part and a bottom of the surface frame. The breezeless member is disposed at a front side of the surface frame. The outer deflector is capable of opening and closing a bottom side of the first air outlet. The breezeless member is configured to open a front side of the first air outlet when located at a first position, and to close the front side of the first air outlet when located at a second position.

A heat exchange system for transferring heat energy to control the temperature of a building comprising: a first heat exchanger having a first and second inlet and a first and second outlet wherein waste water flows through said first inlet of said first heat exchanger and out said first outlet while a water supply flows through said second inlet through said first heat exchanger and out said second outlet so as to transfer heat energy between said waste water and said water supply; and a second heat exchanger having a first and second inlet and a first and second outlet wherein domestic water flows through said first inlet, through said second heat exchanger and out said first outlet while said water supply from said second outlet of said first heat exchanger flows through said second inlet, through said second heat exchanger and out said second outlet so as to further transfer heat energy between said domestic water and said water supply from said second outlet of said second heat exchanger and control the temperature of said building.