Abstract: A tracer particle spreading device for a boundary layer flow visualization experiment based on a flat plate includes a tracer particle generator, a smoke storage box, and a wall-surface particle distribution box. Fume and oil are pressurized by a micro pump and flows into a heating pipe to be heated and vaporized, and then is ejected from a nozzle to form tracer particles. The tracer particles enter the smoke storage box via a smoke guiding tube. An axial flow fan is mounted on a wall surface of the smoke storage box. The tracer particles enter a cavity of the wall-surface particle distribution box via the smoke guiding tube, and the tracer particles are rectified by a rectifying plate and ejected from a spreading slit. An outlet of the spreading slit is at an angle of 15° with respect to an experiment flat plate.

Abstract: A heat exchanger, includes a heat exchange pipe unit and a fin unit, the heat exchange pipe unit includes a refrigerant input pipe, a heat exchange pipe assembly and a refrigerant output pipe; the refrigerant input pipe is connected to one end of the heat exchange pipe assembly; the refrigerant output pipe is connected to the other end of the heat exchange pipe assembly; the fin unit is fixedly arranged outside of the heat exchange pipe assembly; the heat exchange pipe assembly and the fin unit are made of aluminum alloy; and the corrosion potential of the aluminum alloy which forms at least a part of the heat exchange pipe assembly is greater than the corrosion potential of the aluminum alloy which forms the remaining part of the heat exchange pipe assembly.

Abstract: A duct-type air conditioning system, a control method and a device for an indoor ventilator thereof. The control method comprises the following steps: upon turning on the duct-type air conditioning system, acquiring an indoor temperature and a set temperature recorded the last time the duct-type air conditioning system was turned off, and acquiring a present set temperature (S1) according to the indoor temperature and the set temperature recorded the last time the system was turned off; detecting a real-time indoor temperature, according to the present indoor temperature and the present set temperature, calculating a temperature difference between the present indoor temperature and the set temperature, and generating an air velocity adjustment instruction according to the temperature difference, controlling, according to the air velocity adjustment instruction, the indoor ventilator to adjust the air supply velocity (S4) of an indoor unit.

Abstract: A novel air conditioning system includes a compressor; an outdoor heat exchanger; an indoor heat exchanger; and a four-way valve arranged among the compressor, the outdoor heat exchanger, and the indoor heat exchanger and configured to switch to a cooling mode and a heating mode; a first separator connected between the outdoor heat exchanger and the indoor heat exchanger; an auxiliary branch connected to the indoor heat exchanger in parallel and arranged between the gas-liquid separator and the four-way valve. With the first separator, the gaseous refrigerant and the liquid refrigerant is separated, and the gaseous refrigerant is directly bypassed to an outlet of the evaporator by means of the auxiliary branch between the first separator 108 and the four-way valve, thereby reducing the resistance to the refrigerant flowing in the evaporator and raising the energy efficiency of the system.

Abstract: A heat exchanger, includes a heat exchange pipe unit and a fin unit, the heat exchange pipe unit includes a refrigerant input pipe, a heat exchange pipe assembly and a refrigerant output pipe; the refrigerant input pipe is connected to one end of the heat exchange pipe assembly; the refrigerant output pipe is connected to the other end of the heat exchange pipe assembly; the fin unit is fixedly arranged outside of the heat exchange pipe assembly; the heat exchange pipe assembly and the fin unit are made of aluminum alloy; and the corrosion potential of the aluminum alloy which forms at least a part of the heat exchange pipe assembly is greater than the corrosion potential of the aluminum alloy which forms the remaining part of the heat exchange pipe assembly.

Abstract: A duct-type air conditioning system, a control method and a device for an indoor ventilator thereof. The control method comprises the following steps: upon turning on the duct-type air conditioning system, acquiring an indoor temperature and a set temperature recorded the last time the duct-type air conditioning system was turned off, and acquiring a present set temperature (S1) according to the indoor temperature and the set temperature recorded the last time the system was turned off; detecting a real-time indoor temperature, according to the present indoor temperature and the present set temperature, calculating a temperature difference between the present indoor temperature and the set temperature, and generating an air velocity adjustment instruction according to the temperature difference, controlling, according to the air velocity adjustment instruction, the indoor ventilator to adjust the air supply velocity (S4) of an indoor unit.

Abstract: A water receiving in an air conditioner is disclosed. Further, a water-receiving tray structure for an indoor unit of an air conditioner, an indoor unit and an air conditioner. The water-receiving tray structure includes a water-receiving tray, an elevating member and a fixed member; the indoor unit having a casing with a first end defining a return-air inlet and a second end opposite to the first end and defining the air outlet, the water-receiving tray being arranged in a direction from the return-air inlet to the air outlet and being located below a heat exchanger of the indoor unit; the elevating member being arranged at an air outlet end of the indoor unit and supporting an air outlet side of the water-receiving tray; the fixed member being arranged in the indoor unit and being connected to an air outlet side of the indoor unit.

Abstract: A water receiving in an air conditioner is disclosed. Further, a water-receiving tray structure for an indoor unit of an air conditioner, an indoor unit and an air conditioner. The water-receiving tray structure includes a water-receiving tray, an elevating member and a fixed member; the indoor unit having a casing with a first end defining a return-air inlet and a second end opposite to the first end and defining the air outlet, the water-receiving tray being arranged in a direction from the return-air inlet to the air outlet and being located below a heat exchanger of the indoor unit; the elevating member being arranged at an air outlet end of the indoor unit and supporting an air outlet side of the water-receiving tray; the fixed member being arranged in the indoor unit and being connected to an air outlet side of the indoor unit.

Abstract: The present disclosure relates to a field of air blowing technologies of evaporators, more particularly to an evaporator baffle structure, an evaporator and an air conditioner. The evaporator baffle structure is configured as a V-shaped structure, in which two branches of the V-shaped structure are provided with a length-adjustable baffle separately, and a side of the V-shaped structure away from an opening thereof is provided with an evaporator mounting member. The evaporator includes an evaporator body and an evaporator baffle structure, in which the evaporator body is configured as an A-shaped structure, and the evaporator baffle structure is disposed at a top end of the evaporator body. The air conditioner includes the evaporator.