Air conditioner heat exchanger classification and principle introduction

Air Conditioning Heat Exchanger - Classification by Heat Transfer Principle

Surface heat exchanger: The surface heat exchanger is two fluids with different temperatures flowing in the space separated by the wall, through the heat conduction of the wall and the convection of the fluid on the wall surface, and the heat exchange between the two fluids.

Regenerative heat exchanger: The regenerative heat exchanger transfers heat from the high-temperature fluid to the low-temperature fluid through the heat storage body composed of solid materials. The heat medium first passes through the solid material to reach a certain temperature, and then the cold medium passes through the solid material. It is heated to achieve the purpose of heat transfer.

Direct contact heat exchanger: A direct contact heat exchanger is a device in which two fluids are in direct contact for heat exchange, such as a cold water tower, a gas condenser, etc.

Duplex heat exchanger: It is a device that has two heat exchange methods: steam-water surface-type indirect heat exchange and water-water direct mixed-flow heat exchange. Compared with steam-water surface indirect heat exchange, it has higher heat exchange efficiency; compared with steam-water direct mixed heat exchange, it has higher stability and lower unit noise.

Air conditioner heat exchanger - the principle of air conditioning heating

If we want to know the principle of air conditioner heat exchanger, we need to understand the principle of air conditioner refrigeration and heating. In fact, air conditioner heating is simply to reverse the refrigeration process through the four-way reversing valve. The air conditioner with ordinary heating is called The heat pump type, with electric heating wire, is called electric heating auxiliary type.

Air conditioner heat exchanger - the principle of air conditioner refrigeration

After the air conditioner is powered on, the low-pressure steam of the refrigerant in the refrigeration system is sucked by the compressor and compressed into high-pressure steam, and then discharged to the condenser. At the same time, the outdoor air sucked by the axial fan flows through the condenser, taking away the heat released by the refrigerant, so that The high-pressure refrigerant vapor condenses into a high-pressure liquid. The high-pressure liquid is sprayed into the evaporator after passing through the filter and throttling mechanism, and evaporates at the corresponding low pressure to absorb the surrounding heat. The cooled air is sent to the room. In this way, the indoor air is continuously circulated to achieve the purpose of cooling and lowering the temperature. The refrigerant flowing out of the evaporator turns into a low-temperature and low-pressure gas because it takes away the heat in the air (heat absorption), and is sucked into the compressor again, and the cycle repeats.