Walking into the classroom and
taking a glance at the classroom, you may find that there are generally 60
students in it. That’s the normal phenomenon in China. Sometimes it smells in
classroom because every child exhales carbon dioxide and some students don't
pay attention to their individual sanitary, making the classroom smelly. In
such a crowded space, it’s strongly believed that every person won’t feel well.
Opening windows is the common way to ensure fresh air circulation at school.
That would be adorable to do so in spring and autumn when the temperature is
pleasing. But it won’t work when we turn on central heating and air conditioner
in summer and winter. Hence, opening windows is a common but not well-round
way.
Even so, the indoor air is still
dirty. After visiting several schools to have surveys, the content of carbon
dioxide in the classroom in general has reached around 2500PPM, even more than
3500PPM (outdoor carbon dioxide concentration is about 350PPM, it’s harmful to
human body if exceeding 1000PPM). In addition to the peculiar smell in the air,
the main problems in the classroom air quality is a lack of oxygen, which
seriously affect the child's growth and intellectual development.
Kindergartens, schools, training
center are usually crowded. People there usually have strong workload so that
have to stay for a long time indoors. Therefore good indoor air quality is a guarantee
to children’s mental development and is the necessary conditions for the
healthy growth. It’s an urgent need to install new air circulating system and
enterprise should be responsible for paying attention to the air quality in
classrooms.
In China, there is a big difference
about education condition among different cities. It’s difficult to require all
the classrooms around the country to install HVAC system. However only several
developed areas has the ability to install it. We call on relevant departments to
focus on this problem.
As a responsible enterprise with
over 56 years of developing ventilation, Deflecto now offer some selection
methods in the following for your reference:
1.The fresh air volume in the classroom depends on the
number of students and the different age group.
Kindergarten and Primary School: 15M3/H
per person
Middle school, high school and college:
30M3/H per person
For example, there are 60 people in
a classroom. For kindergarten and primary school, the new air volume should be 900M3/H.
And for ,middle school, high school and college, it should be 1800 M3/H.
2.Selection methods of HVAC system in kindergarten and schools.
Schools are places where children
learn and absorb knowledge, which means that it’s required to install HVAC
system with large air volume and low noise. Normally exhaust fan may produce
lots of noise and has a short life, but it’s not suitable to install it in the
classroom even though it can help to circulate air to some extents.
3.In the northern cold region, it is
suggested that schools are equipped with heat recovery of central fresh air
system to ensure good air at the same time also to maintain the stability of indoor temperature. In
the south, people can use HVAC system without heat transfer.
4.There are two main issues should
be paid attention to. One is new air delivered should be as smooth as possible
on the new wind pipe, making students of each region breathe the fresh air. The
other is one must pay attention to safety and convenience whiling using such
system.
More information about HVAC
system,please visit:
