In 2016, the northern part of China was seriously affected by smog. Many schools were suspended due to smog. Finally, in 2017, the Beijing Municipal Education Commission first proposed a plan to install a fresh air system on the campus. The northern smog in Hebei, Shaanxi and Shandong. The Education Committee of the hardest-hit areas also responded in succession, and the campus installation of the new wind system was mentioned on the agenda for discussion. However, there are no professional countermeasures for the core issues of how to choose a new wind system suitable for schools and how to install a fresh air system in schools.
A few days ago, the chief engineer of the Qifengli Fresh Air System gave the following summary based on years of experience and the actual situation of the Chinese campus: an excellent campus-specific fresh air system should fully consider the ventilation effect, purification effect, safety issues, procurement. Cost, operating cost, maintenance cost, intelligent application, centralized control, shape design, professional installation, and timely after-sales. At the same time he gave the following specific analysis and explanation:
1. Efficient air purification and filtration system: China's urban air pollution is becoming more and more serious, and smog is frequent. In addition, formaldehyde, TVOC, germs, radiation and other pollutants brought by school decoration and teaching electrical appliances are seriously harmful to stay in the classroom for more than seven times a day. Hours of students, this model is equipped with 3+1 two-way high-efficiency purification filtration system (primary effect, high efficiency, activated carbon + high efficiency), H13 medical grade HEPA high efficiency layer, PM2.5 filtration rate of 99.97%, fresh outdoor The air enters the room through multi-layer filtration, and the indoor dirty gas is discharged to the outside, and the dust, bacteria, odor and smog are strongly removed, and the clean air environment in the classroom is restored.
2. Ventilation and ventilation reduce classroom carbon dioxide concentration, increase oxygen content, and release negative ions: The study found that the general outdoor carbon dioxide concentration is 380ppm, while the school classroom carbon dioxide concentration usually exceeds 1000ppm or even exceeds 3000ppm. When the concentration of carbon dioxide exceeds 1000 ppm, the test results of the test results are significantly reduced in the nine tests; when the test exceeds 2,500 ppm, the test score is even worse. The main cause of excessive indoor carbon dioxide concentration is poor people and ventilation. Unventilated classrooms will also lead to children's lack of concentration, exhaustion, lethargy, and cold viruses, which can affect health and learning. This model not only has a suitable stable fresh air running capacity, but also continuously delivers fresh oxygen-enriched air to the classroom. It also has an anion module, which is also called air vitamin, which can improve immunity, improve lung ventilation, and can be adjusted at the same time. The cerebral cortex excites and inhibits the process, improving mental activity and work efficiency. In addition, the negative ion purifying air is characterized by fast inactivation speed, high inactivation rate, and inactivation of microorganisms, bacteria and viruses on the surface of air and articles.
3. The best balance of air volume, wind pressure and noise: the classroom is the place where students study and study. Effective and quiet is an important premise of using the fresh air system. If the installation is too large or the wind pressure is too strong, it will certainly produce certain noise. The maximum air volume of this model is 500 m3/h, and the noise is only 31 decibels, which does not affect the students' teachers. The original environmental EPS worm gear combined with ABS silencer wind wheel, scientifically designed cabinet proportion, reasonable air outlet design, and professional on-site layout installation, all only to create a silent new air system that is most suitable for campus use. Depending on the size of the classroom, the number of students, and the requirements for air quality, one or more fresh air mainframes can be installed in one classroom, that is, to achieve effective ventilation and reduce carbon dioxide, and to operate very quietly.
4. Low-energy motor, high heat recovery core, intelligent regulation system, environmental protection and energy saving, greatly reducing operating costs: The school has always been worried about the high operating costs of installing fresh air systems, which has caused greater pressure on school financial expenses. This model adopts low-energy motor with rated power of 110W. One device is used in school for 8 hours per day and 200 days for maximum air volume. The electricity fee is only 105 yuan (electricity fee is about 0.6 yuan). This model is equipped with intelligent air quality sensor. The system automatically adjusts fan operation based on air quality and will further reduce operating costs. The cold and hot summer caused a large difference between indoor and outdoor temperature, and the new wind entered the indoors to cause pressure on the indoor heating or air conditioning system. This model adopts the high-tech nano-film anti-static anti-bacterial maintenance-free counterflow design core independently developed by our company. The recycling efficiency is up to 82%, which can greatly reduce the operating pressure caused by ventilation of air conditioners or heating.
5. White ultra-thin host design, can adapt to the needs of exposed darkrooms: campus classrooms are generally decorated, some classrooms have ceilings installed, some classrooms have no ceilings, this model is only 27 cm thick, can be easily installed In the suspended ceiling, the pipe is taken from the ceiling and the air vent is opened; for classrooms without ceilings, this model is specially designed with a milky white matt enamel paint that can be directly mounted on the ceiling of the classroom and blended into the white ceiling. The square tube is used, which is neat, beautiful and simple.
6. Reserving the 485 communication interface can realize the unified centralized control system of the docking school: Modern schools generally have an intelligent central control integrated system. This model is designed to meet the needs of integrated control of the school. It has specially added 485 communication interface to easily connect campus intelligence. The system realizes centralized control of intelligent air equipment throughout the school and is convenient for management.
At the same time, he gave a variety of piping installation plans according to the number of students in the school classroom, age and air quality requirements. One fresh air host took care of the whole classroom, two or more fresh air mains to take care of the whole classroom:
It is suitable for kindergarten classrooms, kindergarten bedrooms, large, medium and small school classrooms. The number of equipments can be selected according to the specific conditions such as classroom area, number of people and age. The special environment can customize the air volume and function.
According to China's national standard GB/T17226-1998 GB/T 17226-1998 primary and secondary school classroom ventilation standards, the fresh air volume of the school classroom is: primary school ≥11m3/h·person, junior high school ≥14m3/h·person, high school ≥17m3 /h·人.
The chief engineer of Qiyunli also proposed the common misunderstanding of the selection of the campus fresh air system, and gave a specific analysis:
Myth 1: The air purifier is used on campus.
Analysis: Because the classroom space of the school is small and crowded, the excessive carbon dioxide breathed by the students brings more health hazards to students and reduces the learning efficiency. The air purifier can only solve the problem of air cleanliness, and can not solve the problem of reducing carbon dioxide and improving air. Oxygen content problem. Moreover, the fresh air system can more effectively discharge various volatile harmful gases such as formaldehyde, and the air purifier can only target pm2.5, pollen, second-hand smoke, and the like. The use of air purifiers requires regular window ventilation, and the smog also enters the room directly. The human respiratory system and the air purifier are simultaneously handling the haze. The fresh air system can filter the new air with smog outside into the room through multi-layer filtration, which greatly reduces the harm of the smog to the students.
Myth 2: Two unidirectional flows (one incoming air, one outgoing air) or one positive pressure one-way fresh air system are used in the campus.
Analysis: In most parts of China, the temperature difference is large. After the air conditioner or heating is turned on in the classroom, the temperature difference between indoor and outdoor is large. Only through the full heat exchange function, most of the energy can be exchanged and exchanged during the ventilation process to solve the problem caused by ventilation. Temperature loss, reducing the operating pressure of the heating or air conditioning. The use of auxiliary heat functions on some unidirectional flow hosts to solve the problem of outdoor air-conditioning entry is actually a superfluous addition because the operating cost of the auxiliary heat function is higher than that of northern city heating. Therefore, the use of a fresh air system with a full heat exchanger function is the best solution to the indoor and outdoor temperature difference problem.
Myth #3: Wall-mounted new fans are used on campus.
Analysis: Wall-mounted fresh air blowers are generally small in size, small in air volume, and free from wind pressure. Even the new wind introduced by the wall-mounted full heat exchanger is sucked back in a small distance, and there is no static wall hanging. The fan and the wind are not far away, and it is impossible to form air circulation in a wide range. If the installation and maintenance cost of installing multiple wall-mounted new fans is much higher than installing a central fresh air system, the effect is not as good as that of the central fresh air system. .
Myth 4: The use of cabinet-type new fans on campus.
Analysis: The cabinet type new fan generally has a large amount of air, no static pressure, and the wind is still not far away, and it is impossible to form a circulation of air in a wide range; if there is strong static pressure, there will be obvious noise problems. Even if two cabinet-type new fans are installed, it can only achieve the effect of a central fresh air system, and the cost of the cabinet-type new fan is high. The floor-standing installation not only occupies the use space of the classroom floor, but it is inevitable that students will be safe when they contact the host. Hidden dangers.
After in-depth analysis and combing of the chief engineer of the Qifengli Fresh Air System, I believe that there will be a clear understanding and understanding of the regional education committees and schools that are choosing the campus fresh air system.
We sincerely hope that experts from all walks of life, local education committees, schools and fresh air systems can pay attention to the importance of installing a fresh air system on campus. We will work hard together to enable Chinese students to remove masks, smile and be healthy in a safe breathing environment. Grow up happily.
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