On the constant air volume valve in the application of ventilation and air conditioning systems - w

  (A) in the fresh air system at present, in the country, 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 100m3 / 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 100m3 / h, the wind is very small, so that debugging is almost could not be completed. 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. Constant air volume due to the current valve mainly rely on imports more expensive, the author proposes four, five-star hotel, more appropriate use of high-grade office buildings.

(B) in the exhaust system of 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 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 400m3 / h of the toilet ventilation device noise there is about 40dB, so that loss of quiet bathroom.

Large bathroom ventilators also 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) variable air volume air conditioning system in the VAV air-conditioning system, generally outside the area with variable air volume mode, within the area, a constant air flow mode, in an air volume, air pressure changing the air supply system, constant air volume within the zone constant air volume design is inseparable from the valve.

(D) in the clean air conditioning system in the clean air conditioning system to maintain the value of critical pressure clean rooms, or in the exhaust ventilation system in Canada to set air volume valve, can effectively ensure the clean room The positive pressure values.

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