Constant Air Volume Valves Used In Ventilation And Air Conditioning System - Scheduled To Air Flow

Constant air volume valve is a mechanical self-device applications that require constant air volume ventilation and air conditioning system

. Constant air volume air flow control valve does not require external power, it relies on the wind pipe flow control valve positioning force to the location of the pressure difference in the whole range will be maintained at pre-set air flow on.

(A) in the fresh air system

At present, domestic, air fan coil air conditioning system or the more common, especially in some hotel rooms, most office buildings are in this way. Common practice is to set a new air handling units on each floor, the aisles of new dry pipe laying, were dozens of branch root access to the room from the mains on. To hotel rooms, for example, is generally fresh air in every room 100m

3 / H, how to do each tube of the air flow are consistent? In general, designers tend to wind in the new addition of a branch pipe on the air volume control valve, expected to be completed by means of post-commissioning wind distribution. Since the new air system generally are dry tube length, branch short, while the air volume control valve adjustment is neither intuitive, regulation accuracy is not satisfactory Moreover, fresh air in every room only 100m

3 / H, the wind is very small, so that debugging is almost impossible to accomplish. Construction of new units can do about dry measuring the total air volume control, ensure that all air supply branch feel that the point of the wind. In order to ensure that all rooms are designed to send fresh air to reach the value of construction units need not go to a room in a room of balance, we just wind each branch on the new addition of a constant air volume valves, these problems will be solved.

To live in high-rise buildings, office often holds worry less fresh air, and designers often feel aggrieved. Because from the drawing point of view, fresh air standard value is not low, but we tend to overlook the question of how to ensure the practical effect of the design point of view, but constant air volume valve in the fresh air system is a powerful measure.

Due to constant air volume valves now mainly rely on imports more expensive, I recommend four or five-star hotel, more appropriate use of high-grade office buildings.

(B) in the exhaust system A good air conditioning system design, and its exhaust system to be very reasonable, and this is often not given due attention. In civil, particularly in high-rise building, the building envelope air tightness good, just less air flow can maintain the room pressure value. About 85 ~ 90% of fresh air to be exhausted to the outside through the exhaust organized, so as to ensure the air supply and exhaust air flow balance, otherwise no amount of fresh air can not be sent to the room. In the civil construction, the exhaust generally through toilet, water and other auxiliary space between the exhaust outside. In addition, sometimes a ventilation system should be further increased in order to guarantee delivery, exhaust balance. The bathroom exhaust, common practice is to set up a bathroom in each, two bathroom ventilators, exhaust and ventilation shafts on the interlock. We know that high-rise building air system should be run throughout the year, the appropriate ventilation system should also be run throughout the year. In other words, people who can not use the bathroom toilet ventilator to control the opening, set toilet ventilator, there is no need. Moreover, a large fan with dozens of small fans that run the exhaust system not only difficult to match, not economic. Exhaust capacity of 400m

3 / H, bathroom ventilators have 40dB of noise around, so losing a quiet toilet. The bathroom has a large number of ventilators to maintain a great deal of trouble. To address this problem, we may cancel the bathroom ventilators, ventilation shaft on each floor in the branch of an additional one constant air volume valve, located at the top of a ventilation shaft machine. This exhaust system to ensure the levels are roughly the same amount of ventilation, and system control is simple, reliable, bathroom can be very quiet.

(C) In the Variable Air Volume System

In VAV air conditioning system, generally outside the district by way of variable air volume, constant air volume within the area by way of an air volume, changing air pressure system, the inner zone constant air volume air flow design is inseparable from the set valve.

(D) in the clean air conditioning system

In the air conditioning system to maintain the value of clean rooms critical pressure, exhaust or ventilation system in Canada to set air volume valve, can effectively ensure the clean room pressure value.

Operating room with surgery without positive pressure when required to keep the operating room, surgery positive pressure when the outdoor air in order to ensure fresh air required to add personnel to fresh air, fresh air as when surgery is not carried out only necessary to ensure positive pressure fresh air, the new air duct in need of a double-bit constant air volume valves.

(E) balanced on the wind pipe applications

In all air systems, because of the impact of construction conditions, each tube is certainly not balanced between the resistance, generally use the three-way valves or a multi-leaf off air flow control valve to complete the distribution. To ensure that important room or the main branch on the wind Buzhi Yu too big or too small, to reduce the blindness of debugging, set the air volume increases may be appropriate to replace the three-way valve off the valve or multi-leaf valve.

(6), will use the characteristics of wind

Constant air volume valve is automatic mechanical body, no external power, plus the electric actuator can signal through the remote control to change the flow settings. Fixed air flow valve in the delivery and exhaust system can be applied, the working temperature is generally 10 ~ 50 , pressure range of 50 ~ 1000Pa, the valve before the application of at least 50Pa differential pressure valve, air flow valve or will not work. This point should be noted that, as the new air system pressure value of the new air units generally are not great. Constant air volume valve installation from the location restriction, but should ensure that the level of the valve shaft, valve usually requires a long straight edge 1.5 times the distance of the entrance duct and 0.5 times the distance of the straight exit duct. Constant air volume control valve high precision scale with external indicators show flow, regulation accuracy of about 4%, limiting not required to maintain, complete with the system, constant air volume valve rectangular, circular, insulation, muffler type can be selected.

Balancing valve in the air conditioning system, as is increasingly being used by the general designer of the same, constant air volume valve because that is precisely adjustable, self-balancing feature, it will be sent, exhaust system has been widely used .

by: gaga

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