【School】 be weak valve ventilation and air conditioning system in the application of technology.

<br> <BR> constant air flow valve is a mechanical self-device applications that require constant air volume ventilation and air conditioning systems. .Constant air volume air flow control valve does not require external power, it relies on the wind pipe air force to locate the control valve position, the pressure difference in the whole range will be maintained at pre-set air flow on. .<BR> <BR> (A) in the fresh air system <BR> <BR> present in the country, fresh air fan coil air conditioning system is more common, especially in some hotel rooms, most of the office space, office .House have adopted this approach. .Common practice is to set up a new air handling units on each floor, walkways dry lay new pipes, were dozens of branch root access to each room from the mains. .To hotel rooms, for example, each room air quantity is generally 100m3 / h, how to do each branch of the air flow are consistent? .In general, designers tend to be in the fresh air of a branch of an additional air volume control valve, hoping to complete by means of post-commissioning air flow distribution. .Since the new air system generally are dry tube length, short branch pipes, and air volume control valve adjustment is neither intuitive, regulation accuracy is not satisfactory Moreover, fresh air in each room only 100m3 / h, wind is very small, so that debugging is almost .could not be completed. .Construction unit can do about the new dry pipe measuring the total air volume, air supply to ensure that the sense of this branch point of the wind. .In order to guarantee the delivery room, fresh air can reach the design value, and need not go to a room construction unit balance of a room, we just wind each branch on the new addition of a constant air flow valve, the above problem is solved. .<BR> <BR> To live in high-rise buildings, office often holds worry lack of fresh air, and designers often feel very aggrieved. .Because from the drawing point ofview, the values of ventilation rate standards are not low, but we often ignore the question of how to ensure the practical effect of the design point of view, while the fixed air flow valve in the fresh air system is a powerful measure. .Constant air volume due to the current valve mainly rely on imports more expensive, I suggest four or five-star hotels, upscale office of comparative fit. .<BR> <BR> (B) in the exhaust system <BR> <BR> a good air conditioning system design, and its exhaust system to be very reasonable, and this is often not given attention. .In the civil particularly in high-rise building, the building envelope air tightness good, just less of the air flow can maintain the room pressure value. .About 85 ~ 90% 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. .<BR> <BR> In civil construction, generally through the bathroom exhaust, 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 ventilation is common practice to set up a bathroom each, two bathroom ventilators, and exhaust ventilation shaft on the chain. .We know that high-rise building a new air system should be run throughout the year, the corresponding ventilation system should also be run throughout the year. .In other words, people can not use the bathroom toilet ventilator to control the opening, located bathroom ventilators, there is no need. .Moreover, a large fan with dozens of small fans that run both difficult to match the exhaust system, not the economy. .Exhaust capacity of 400m3 / h toilet ventilators have 40dB of noise about the loss of a quiet toilet. .<BR> <BR> A lot of bathroom ventilation but also to maintain a great deal of trouble. .To address this problem, we can cancel the bathroom ventilation, ventilation shaft on each floor of a branch of an additional fixed air flow valve, an exhaust shaft located at the top. .This exhaust system to ensure roughly equal amount of each layer of the exhaust, while the control system is simple, reliable, bathroom can be very quiet. .<BR> <BR> (C) variable air volume air conditioning system <BR> <BR> in variable air volume air conditioning system, generally outside the area by way of variable air volume, constant air volume within the area by way of a wind, the wind .pressure changing the air supply system, the inner zone constant air volume air flow design is inseparable from the set valve. .<BR> <BR> (D) in the clean air conditioning system <BR> <BR> in the clean air conditioning system to maintain the clean room pressure value is essential, in the exhaust or ventilation system in Canada to set .air flow valve, can effectively ensure the clean room pressure value. .Operating room when surgery is not the time with positive pressure required to keep the operating room, surgery positive pressure when the outdoor air in order to ensure the necessary additional personnel needed fresh air fresh air, fresh air during surgery without positive pressure to ensure that only .needed fresh air, so the need for new air duct on a double-bit fixed air flow valve. .<BR> <BR> (E) The balance in the wind pipe <BR> <BR> on the application of air in the whole system, because the conditions affected by construction, each tube is certainly not balanced between the resistance, the general links .valves or a multi-leaf off the air flow control valve to complete the assignment. .To ensure that important room or the main branch Buzhi Yu The wind is too large or too small, to reduce debugging blindness, may be appropriate to increase air flow valve set to replace the three-way valve or multi-leaf off valve. .<BR> <BR> (F) the use of fixed air flow characteristics of <BR> <BR> fixed air flow valve is automatic machinery sector, no external power, plus the electric actuator signals by 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 valve at least 50Pa differential pressure applications, or fixed air flow valve does not work. .<BR> <BR> This point should be noted that, as the new air system pressure value of the new air handling units are generally not large. .Fixed air flow valve installation regardless of location restrictions, but should ensure that the level of the valve shaft, generally require a valve from the long side of the line 1.5 times and 0.5 times the inlet duct from the duct exit line. .Fixed air flow valve control, high precision, scale and external pointer shows flow to regulate the accuracy is about ± 4%, limiting not required to maintain, complete with the system, constant air volume valve rectangular, circular, insulation, muffler type can be selected. .As the balancing valve in the air conditioning system is increasingly being adopted by the majority of designers, like, constant air volume valves because that is precisely adjustable, self-balancing features, but also will be sent, the exhaust system has been widely used. .<BR> <BR>.