The surface temperature at the places where the space is heated up only by convection becomes approximately 20°C. Thus, the air in the space should be heated up to 24-26°C to feel ourselves comfortable in this kind of place. We can reach the similar comfort level when the wall surface temperature is 18°C. The differences are those when we take our body into consideration; we feel comfortable at cool air temperatures, our respiration is more intensive and strong, relative humidity of the air is higher (air is not dry), the air movements in the space is less, and there are less contamination by dust and bacteria in the space.
Internal wall surfaces become cold as a result of wrong material selection for insulation, and use of wrong heating systems in the buildings. Owing to this fact, we have to heat up the inside air of the space more than required to reach an comfortable air temperature level. Under these conditions, heat could be be easily dissipated to the spaces and regions which is not required to be heated up normally. As an example to this case, we can show an apartment flat which is warm and uniformly heated from dining room to bedroom and from kitchen to corridor. There is a thermal monotony in these kinds of dwellings. According to the researches carried out on this subject, thermal monotony in the buildings might cause weariness, low performance, headache, depression, hypertensional symptoms, neural stress, sleep and perspiration irregularities, and various allergies.
Advantages:
Thermal conductivity,
Heat storage capacity,
Ability and tendency to entrap moisture from air (hygroscopy) or materials,
Ability to transmit water through material (water permeability, transmission by capillary effect),
The behaviour of moisturized material (moisture desorption),
Sound absorption-insulation and ability to keep this feature for long time,
Durability against moisture,
Tendency towards form and volume changes under varying temperatures and humidity,
Endurance of the material against high and low temperatures,
Hardness, properties related to changes with the effects of temperature and humidity,
Resistant to corrosion,
Structural stability,
Resistant to chemical attacks (resistant to acids,alkalines and organic solvents),