1. MEANING OF COMFORT
Welfare conditions are defined by the balance
between humidity and temperature
Human body as a heat
source
Physics linked to
thermodynamics and
the spread of energy
in the form of heat
2. HUMAN BODY
The human body produces heat and
adjusts its temperature dispersing
part of the heat produced to arrive
at the optimal temperature
The dispersion is carried out for:
Irradiation (46%)
Convection (28%)
Breathing or swetting (21%)
Conduction (5%)
3. HUMAN BODY
Irradiation (46%): depends on
the temperature of the
surfaces that surround us
Convection (28%): depends on
temperature and speed of air
Evaporation (21%): depends on
the phisical activity,
temperature of internal
surfaces, and of the air
Conduction (5%): depends on
temperature of surfaces we
are in touching
4. HUMAN BODY
When body dissipates
more heat needed,
then we feel “cold”
When body dissipates
less heat needed,
then we feel “hot”
5. COMFORT
To perceive a feeling of
comfort you need to keep a
person within a
precise"climate“ zone as shown
in the Curve optimum living
comfort diagram, according to
Bedford-Bachman" (Curve of
comfort)
The comfort is not related to the "famous" 20°air
temperature, but on interaction among air temperature and
mean radiant temperature provided from the walls
