VAV system
VAV is a variable air volume air conditioning system. As the name implies, it adjusts the temperature of a certain space by changing the air supply volume, not by changing the air supply temperature as people often think.
The working principle of this refrigeration system is that when the load of the air-conditioning working area changes, the system terminal device automatically adjusts the air supply volume, so that the temperature can be ensured to be stable and within the designed range. For example, under low load conditions, the air supply volume will decrease, and the air supply fan speed of the air handling unit will also decrease accordingly, which can also achieve the purpose of energy saving.
The general components of the variable air volume system are: air handling equipment, supply (return) air system, terminal device, air supply port and automatic control instrument, etc.
Generally, the situation where the VAV system is more suitable:
- In the same air conditioning system, the difference between the hot and cold and the load of each working area varies greatly, the low-load operation time is long, and the temperature of each air-conditioning area needs to be controlled separately.
- Cold air is required in the building all year round.
VAV system
VWV is a variable water volume system for air conditioning. As the name implies, it controls the terminal temperature by controlling the water flow. It has many similar or identical features with VAV. In many cases, their control strategies are actually the same. VWV mainly controls the water flow through valve sensors, and ultimately controls the temperature. Its working principle is very similar to that of VAV.
Most European and American central air conditioning brands on the market use water systems. The advantage of water systems is that they will naturally maintain room humidity while cooling, and will not dry the air when cooling like ordinary air conditioners. The overall price is also more affordable, but the later maintenance is more troublesome because of the presence of scale, which requires maintenance from time to time to prevent affecting the sensitivity of the valve.
Both have their pros and cons. It mainly depends on the service strength of each brand and the characteristics of the regional environment where your house is located. Combine these objective factors and then choose a central air conditioner that suits you.
