Comfort zone

The comfort zone is the most favourable combination of temperature, humidity, speed of air movement and exposure to radiant heat, causing the optimum condition and well-being of the person. In these conditions the heat exchange occurs normally not visible sweat, the body temperature is within the normal range. Since all of the above meteorological factors influence the heat exchange between the organism and the environment, it is necessary to take them into account a complex effect. For most people, at rest or performing light physical work, the most favorable conditions are the temperatures of the air in the room in winter, from 18 to 22 degrees, summer, from 23 to 25, the air speed in winter is about 0.15 msec and summer 0,2-0,4 m/sec. Relative humidity 40-60%. The temperature limits of your comfort zone as a result of increased heat generation in the organism are shifted down the severity of physical work performed by man. By increasing the speed of movement of air up to 1.5 m/s temperature limit comfort zone increased to 26 degrees at a speed of air movement 3 m/s up to 28 degrees. Speed of movement of air in excess of 3 m/s, do not provide comfort. To create a favorable microclimate (see) requires that the temperature of an internal surface of fencings of premises (walls, floors) should not be below the air temperature by more than 4-6 degrees. At the greater the temperature difference increases heat loss by radiation into the environment and there is a feeling of chilliness. In determining comfort zone should take into account the effects on the body radiant heat (direct sunlight, heated surfaces of heating devices, enclosures of premises, and so on). In these conditions the temperature limits of your comfort zone reduced.
Comfort zone may not be the same for different areas: they depend on the climate, the season, the degree of adaptation of the organism, the nature of work, service, etc.,