Working Principle of Multi-split Air Source Heat Pump System

The multi-split air source heat pump system is mainly composed of outdoor unit, indoor unit and connecting pipes.

Refrigeration principle

1. Evaporation heat absorption

In the indoor unit, the refrigerant (such as Freon) evaporates in the evaporator. When the liquid refrigerant becomes gaseous, it absorbs the heat in the room and reduces the indoor air temperature.

2. Compression and heating

The gaseous refrigerant is sucked in and compressed by the compressor, and the pressure and temperature increase.

3. Condensation heat release

The high-temperature and high-pressure gaseous refrigerant enters the condenser of the outdoor unit, releases heat to the outdoor environment, and the refrigerant is reliquefied.

4. Throttling and pressure reduction

The liquid refrigerant is throttled and reduced in pressure through a throttling device (such as an expansion valve), and after lowering the temperature, it enters the indoor unit evaporator again for circulating refrigeration.

Heating principle (heat pump principle)

1. Reverse cycle

The flow direction of the refrigerant is changed through a four-way reversing valve, so that the condenser originally used for cooling becomes an evaporator, and the evaporator becomes a condenser.

2. Absorb heat

In the outdoor unit, the refrigerant evaporates and absorbs heat from the outdoor environment (even in low temperature environments).

3. Release heat

The gaseous refrigerant is compressed and enters the condenser of the indoor unit, releasing heat to warm the indoor air.

The multi-split air source heat pump system can independently control the temperature according to the needs of different indoor units, and has the advantages of high efficiency and energy saving.