Constant air volume valve in the ventilation and air conditioning system

    HC HVAC & R Network Fixed air flow valve is a mechanical self-device applications requiring fixed air volume ventilation and air conditioning system. The constant air volume air flow control valve does not require external power, it relies on the wind pipe air force to locate the position of the control valve in the entire range of differential pressure within the gas stream is maintained at a pre-set traffic.

    The new wind system

    The domestic air fan coil air conditioning or the more common, especially in some hotel rooms, most of the office buildings are in this way. The common practice is located on each floor of the new air handling units, walkways laying new air dry pipe, dozens of branch pipe from the manifold to access each room. Hotel rooms, for example, each room fresh air is generally 100m3 / h, how to do the air volume of each tube? In general, designers often additional new wind manifold and an air flow control valve, and expect to complete by late debugging means air distribution. Fresh air system under normal circumstances are dry tube length, short branch pipe, air volume control valve adjustment is neither intuitive, regulation accuracy is not ideal, Moreover, each room fresh air only 100m3 / h, the wind is very small, so debugging is almost can not be completed. Construction unit can only do the measured total air volume of the new air-dried tube, air supply branch pipe so that the point of the wind flu. In order to guarantee fresh air to send in each room to achieve the design value, do not need to go to a room, a room the balance of the construction unit, we simply add each new wind manifold set a constant air volume valve, the above problem is solved. Living in high-rise buildings within the office often holds worry the lack of fresh air, and designers often feel very aggrieved. Judging from the drawings, the fresh air standard value is not low, but we tend to ignore a problem, how to ensure that the actual results from the design point of view, depending on the air flow valve in the fresh air system, is a forceful measures. Constant air volume valve mainly rely on imports more expensive, I suggest in the four, five-star hotels, high-end office buildings use more appropriate.

    The exhaust system

    A good air conditioning system design, the exhaust system must be very reasonable, and this is often not given due attention. In civil construction, especially in high-rise buildings, the air tightness of the building envelope is very good, just less air volume can maintain room pressure value. About 85 to 90% fresh air from the outdoors, so as to ensure that the air supply, exhaust air flow balance, otherwise no amount of fresh air can not be sent to the room must be organized exhaust. In civil construction, exhaust generally through the bathroom, water auxiliary space exhausted to the outside. , In addition, sometimes an additional set of exhaust system, to ensure delivery, exhaust balance. For bathroom exhaust, the usual practice is to each toilet, two bathroom ventilators, exhaust fan interlock with the ventilation shaft. We know that high-rise buildings within the fresh air system should be run throughout the year, corresponding exhaust system should be run throughout the year. That is, to use the bathroom can not go to control the opening of the bathroom ventilators, there is no need to set bathroom ventilators. Moreover, a large fan with dozens of small wind turbines exhaust system runs both difficult to match and uneconomical. Exhaust capacity of 400m3 / h of the bathroom ventilators noise have about 40dB, the bathroom lose quiet. The bathroom ventilation great deal of trouble to maintenance. To solve this problem, we can cancel the bathroom ventilation, the addition of a constant air volume ventilation shaft on each branch pipe valve shaft located at the top of an exhaust fan. This exhaust system, to ensure that the layers the exhaust amount roughly equal, system control is simple, reliable operation, the bathroom can be very quiet.
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    Variable air volume air conditioning system

    VAV air-conditioning system, outside the area using the variable air volume within the zone constant air volume in a wind amount, wind pressure constantly changes the air supply system, the inner zone constant air volume design is inseparable from the given amount of wind valve's.

    Clean air conditioning system

    Pressure value is essential to maintain a clean room in the air conditioning system, plus a set amount of wind valve in the exhaust or ventilation system can effectively guarantee a clean room pressure value.