Ventilation Theory And Air Handling Units; Purpose Of Air-Conditioning - Panasonic PAW-160MAH2L Installation Instructions Manual

Ventilation theory and air handling units

2 Ventilation theory and air handling units
2.1

Purpose of air-conditioning

The purpose of air-conditioning is to provide comfortable indoor air conditions for the room oc-
cupants and to provide energy saving potentials for the owner.
Comfort
If room occupants feel "comfortable" in a given room, depends mainly on the following two
factors:
● air temperature
● relative air humidity
However, optimum working or living conditions do not only exist at a specifi c setpoint of room
temperature and room humidity, but also within a certain band width of the setpoint.
A temperature setpoint of 22 °C and a relative humidity setpoint of 45 % with variations of ±2 °C
and ±15 %rh respectively are typical levels used for offi ce spaces. Also, at high temperatures,
maximum limitation of absolute humidity should be provided to avoid "muggy" conditions. Typi-
cally, this limit value lies at about 10 g/kg (H
Energy savings
Besides the advantages in terms of indoor air quality, air conditioning off ers also an energy sav-
ing potential. For example, while uncontrolled ventilation through open windows leads to large
amounts of heat being lost to the outside during the heating season or gained from the outside
during the cooling season, air conditioning systems provide possibilities to utilize the extra "free"
energy in heat recovery modules so that overall operating costs will be reduced.
The larger the area of the comfort range, the better the energy saving opportunities.
16
Cooling and
humdifying
Humdifying only
Heating and
humdifying
O).
2
Absolute humidity
Cooling only
24 °C
Comfort range
35 %rh 65 %rh
20 °C
Heating only
Humdifying and
reheating, if required
rh = relative humidity