Variable air volume terminal device for clean workshop purification project

Variable air volume terminal device for clean workshop purification project

I. The structure of the variable air volume terminal device and the operation of the variable air volume system in the purification project of the clean workshop

1. Structure of variable air volume terminal device

VAVBox is a VAVBox widely used in northern Europe, a semi...

Text label: clean workshop purification project, variable air volume terminal device

Variable air volume terminal device for clean workshop purification project

I. The structure of the variable air volume terminal device and the operation of the variable air volume system in the purification project of the clean workshop

1. Structure of variable air volume terminal device

VAVBox is a VAVBox widely used in northern Europe, which is a terminal device of a semi-centralized air conditioning system.

The variable air volume terminal device is composed of a box, a nozzle, and a regulating valve.

2. Operation of variable air volume system

Variable air volume can better ensure indoor airflow organization than conventional single-channel variable air volume, with higher comfort, and can also be used in low-temperature air supply systems to further reduce the design capacity of the air system; it can also be used on the ceiling Heat from lights, etc., to delay the activation of the reheat system, making it more energy efficient.

When cooling demand decreases, via VAV

The reduction in the total air volume supplied by the Box to the air conditioning area is smaller than the reduction in the primary air volume. This allows the system to operate with a primary air volume as low as 20%, and there is no chance that the sent cold air will quickly sink from the diffuser to the ground without sufficient heat exchange. The minimum air volume ratio of conventional variable air volume systems is usually limited to 50%. This means that VAV systems can be set at lower air flow values, allowing them to function well even at between 20% and 50% of cooling demand, which can save even more energy.

Second, the characteristics of the variable air volume system in the purification project of the clean workshop

When the supply cooling capacity meets the cooling load of the air-conditioned clean room modular, that is, when it works in the cooling mode, the VAV system has the advantages: it is suitable for the low-temperature air supply system with lower air supply temperature; it is similar to the single-channel VAV system. It can ensure that the indoor air is fully mixed and maintain a reasonable airflow organization; it allows the central air conditioner supplying primary air to work with a smaller circulating air volume.

The variable air volume terminal device utilizes the secondary air entering the ceiling from the clean room modular at a high speed of the primary air, adjusts the mixing ratio of the primary air and the secondary air, and sends it into the clean room modular. For the convenience of adjustment, a constant air volume device is installed on the primary air outlet. Reduce, only gradually open the secondary air door to increase the air supply temperature; in order to reduce noise, the static pressure at the primary air outlet is not more than 500Pa; the advantage is that the air outlet can be combined with lighting fixtures, and the indoor lighting heat can be used for reheating Therefore, energy is saved; the initial investment and operating cost of the variable air volume system using the variable air volume terminal device are higher than that of the throttle type.

VAVBox comes in many forms, with ends with rectangular outlet, end with rectangular outlet and built-in reheat coil, and multi-outlet end with built-in reheat coil. VAVBox is suitable for office buildings, clean workshops and other occasions. Since VAVBox does not produce condensed water, this is also a very important feature of this type of device. VAVBox has some advantages that the traditional all-air system does not have, the size of the air duct is reduced, and the space is saved. The disadvantage is that the noise is large and the wind speed control is not easy. Combining VAVBox with automatic control can further improve the control precision and achieve the expected control goal.

VAVBox is a system worth promoting. The use of VAVBox in the air-conditioning system of office and clean workshop purification projects can solve various defects of fan coil units and provide a more comfortable living environment for people's lives.

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