Kinds Of Ventilation - Daikin VAM-FA8VE Technical Data Manual

• HRV • VKM-GA(M)V1
•
Yawning is a sign of insufficient oxygen
You may think that persons who frequently yawn have no concentration. However, this is not the case
depending on the situation. Yawning is a physiological phenomenon that can occur when the brain is
suffering from the shortage of oxygen. Concentration can be reduced by the shortage of oxygen. Yawning
is an action to try to keep himself (herself) concentrated. Fresh air required for human body is min. 30 mg
per hour. This corresponds to the oxygen amount contained in a room of normal size (about 10 m
suggests that four persons of a family cannot stay for more than one hour in an enclosed, non-ventilated
living room about four times larger than a normal size bed room or private room. Yawning should be
considered a sign of oxygen shortage. In such cases, immediately take fresh air into the room.
Table 9 Effect of Oxygen (O
Concentration (%)
Humidity
Humidity has a close relationship with our living environment. Humidity is an additional parameter to be
controlled by air conditioning systems. It may give persons a feel of mild air, if the temperature is relevant
for the humidity. Imbalance between the temperature and humidity (especially higher humidity) leads to
discomfort. A term that is frequently used in summer, "discomfort index," indicates this imbalance between
temperature and humidity. Higher humidity causes buildings and furniture to rot. Lower humidity causes our
skins to dry and buildings and furniture to crack or warp. Another point for controlling humidity is to avoid
mold, ticks and termites. To satisfy all of these requirements, two types of ventilation must be used in a well
controlled, combined manner. One is to maintain the humidity for our living comfort, and the other one is to
remove humidity where dryness is required to prevent such mold and small animals.
<Relative humidity recommended = 30~70%>

11.2 Kinds of Ventilation

11.2.1 Methods of Ventilation
Natural ventilation based on the natural conditions and mechanical ventilation using mechanical power
Natural ventilation
Uses external wind pressures and/or buoyancy force
produced by the difference in temperature between
the inside and outside of the room: subject to natural
conditions, so the benefits are unforeseeable, or
smaller than expected.
Mechanical ventilation
Forced ventilation using a power-driven fan or blower produces larger flow in a more stable and timely
manner than natural ventilation.
* To ventilate a more heavily polluted room, it is necessary to keep the room air pressure lower than the
surroundings to avoid the dirty air flowing into the adjacent rooms or passages; for clean rooms, it is
necessary to keep the room air pressure higher than the surroundings to avoid the dirty air coming into
the room.
Building, parking area in a building, boiler room,
electric room, machine room, galley, warehouse, etc.
• HRV • Heat Reclaim Ventilation
) Concentration
2
About 21 Standard air
Ventilation shall have a target of not decreasing the O
20.5
from the normal value (Building Standard Act)
In the normal atmospheric pressure, this small reduction in O
20~19 affects our lives, though in the case of using a combustion apparatus, possible imperfect
combustion may cause the CO concentration to increase quickly.
18 Standard of Labor Safety and Health Law (Oxygen Starvation Preventive Regulation)
16 Concentration during breathing in normal cases
16~12 Increase number of pulses and breaths, giddiness, and headache
15 Combustion apparatuses will be put off
12 Possibility of death within a short time
7 Death
Exhaust Mechanical ventilation
Supply Mechanical ventilation
Room
Ventilation fan
Ventilation fan
Standard, and effect of change in concentration
Exhaust Natural ventilation
Supply Mechanical ventilation
Positive
pressure
Exhaust opening
Room
Ventilation fan
Clean room, machine
cooling, etc
2
), which
concentration by 0.5% or larger
2
concentration unlikely
2
Exhaust Natural ventilation
Supply Natural ventilation
Warehouse, gymnasium, and plants
where heat is used or produced
Exhaust Mechanical ventilation
Supply Natural ventilation
Negative
pressure
Room
Ventilation fan
Intake
Kitchen, toilet, pantry, etc. in residential
housing, and copy room, etc.
2
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