MEANING OF COMFORTWelfare 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

HUMAN BODYThe 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%)

HUMAN BODYIrradiation (46%): depends on the temperature of the surfaces that surround usConvection (28%): depends on temperature and speed of airEvaporation (21%): depends on the phisical activity, temperature of internal surfaces, and of the airConduction (5%): depends on temperature of surfaces we are in touching

HUMAN BODY

When body dissipates more

heat needed, then we feel “cold”

When body dissipates less heat

needed, then we feel “hot”

COMFORTTo 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