【 Weak current College 】 fixed air valve in the air conditioning is how to apply?

Constant air flow valve, is a mechanical device from force, apply to the need for air ventilation and air conditioning systems. Constant air flow valve air volume control does not require external power, it relies on the wind tube air force to position the control valve position, resulting in a whole range of pressure differential flow at pre-set flow.
In the fresh air system

At present, domestic, fan coil system for air conditioning or the more common, especially in the hotel rooms, most of the Office, the Office has in this way. It is usually located on each floor, aisle air supply unit laying new air dry tube, dozens of root-access from the rooms on the manifold. The hotel guest rooms, each room ventilation rate generally 100m3/h, how to do various branches of the air flow consistent? General, designers tend to add fresh air pipes on a flow control valve, expectations through late debugging tools to complete the air distribution. Because of the fresh air system normally for dry pipe, tube, short, and the air flow control valve regulation neither intuitive adjustment precision is not ideal, after all, each room ventilation rate only 100m3/h, the air volume is small, so debugging is almost impossible. Construction units can do to have your new air dry tube of total air, ensure that the air supply pipes are the wind. In order to guarantee the room by sending new design value of air flow reach, and without the construction unit to a room in a room of balance, we only need fresh air in each branch add decided on an air valve, the above problem is solved. In high-rise buildings in residential and Office people often have trouble not enough fresh air, and designers often feels wronged. Because from the drawings, new air standard value is not low, but we tend to ignore the question of how to design to ensure the practical effect, which air valve in the air supply system, is a forceful measures. Because of the current fixed air valve mainly rely on imported, the price is more expensive, the author proposes four-, five-star hotels, the upscale Office use is appropriate.

In the exhaust system

A good air-conditioning system design, it's exhaust system must be reasonable, which are often not taken seriously. In the civil construction especially in high-rise buildings, the building envelope for air tightness good, fewer air flow can maintain room of positive pressure value. About the new wind of 85-90% must be organized in the exhaust air from the outside, so you can guarantee that air, exhaust air volume balance, otherwise the number of new air cannot get into the room. In the civil construction, exhaust General through bathroom, hot water, and so assisted housing exhaust outside. In addition, sometimes also should add another set of exhaust system in order to ensure delivery and exhaust air balance. For the bathroom exhaust, the usual practice is to set each toilet, ventilator, only toilet with ventilating shafts on the exhaust fan interlock. We know, high-rise buildings in the fresh air system should be running all year round, the exhaust system should also be run all year round. That is, the person using the toilet may not be to control the open bathroom, the bathroom ventilation of necessity. Besides a large blower with dozens of such small fan exhaust system running both difficult to match, and not economic. Exhaust volume for 400m3/h bathroom ventilation noises have 40dB or so, so that the toilet without peace. Large bathroom ventilators are to maintain a great trouble. To resolve this problem, we can cancel the bathroom ventilation, exhaust shaft of each layer-add decided on an air valve located at the top of the shaft of a fan. This exhaust system that can guarantee various layer exhaust volume approximately equal, and system control simple, reliable, and the bathroom can be very quiet.

In VAV system

In VAV system, General, district VAV, using fixed amount of wind in the area, in anair flow, pressure changing air supply system, the inner area for air flow design is indispensable for air flow valve.

In the clean air conditioning system

In the clean air conditioning system to maintain clean room of positive pressure value is vital, in the exhaust air or exhaust system together with setting the air valve, can effectively ensure clean room of positive pressure value. When the operation clean operating room and do not need to maintain the operating room time pressure, surgery is the new amount of wind to ensure positive pressure needed new Air Canada staff in the new amount of wind, surgery is not a new amount of wind is only when that positive pressure required fresh air, fresh air tubes need to set up air-valve.

In the wind pipe pipeline balancing application

In all air system, due to the influence of architectural conditions, each branch is certainly not a balance between the resistance, generally use three-way valves or valve off more leaf to complete air distribution. In order to ensure the important rooms or main branch of the air flow would not be too large or too small, reduce debugging blindness can be added setting the air flow valve to replace the three-way valves or valve off more leaves.

Fixed amount of wind characteristics on the use

Fixed air valve is automatic, no need external power, plus electric actuator through remote control signal change in flow rate setting. Fixed air valve in the air exhaust system can be applied to the operating temperature is 10 ~ 50 ℃, pressure range is 50 ~ 1000Pa, i.e. the valve after application before valve 50Pa pressure differential at the very least, otherwise fixed air valve does not work. It should be noted that because the ventilation system air supply unit of air pressure value is generally not very big. Constant air flow valve installation location restrictions, but valve slice axis should guarantee level generally require a valve on the long side of the straight line distance 1.5 times the entrance to the duct and the straight line distance 0.5 export air duct. Constant air flow valve control and high precision, with external pointer display flow scale adjustment precision is approximately ± 4%, current limiting bodies do not need maintenance, and system Accessories, air valve rectangular, circular, insulation, noise control type can be selected.

As balancing valve in the air-water systems are increasingly being used by the majority of designers, will air valve because it accurately adjustable, automatic balance of features, you will be sent, the exhaust system has been widely used.


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