What are the general comfort conditions in an air-conditioning system?

Explanation:

Effective temperature 

• It is the temperature of saturated air at which a person or human being would feel the same level of comfort as in the actual environment.
• It includes comfort temperature, velocity, and purity.

Factors affecting the effective temperature

Climatic and seasonal differences

• People living in a warmer region feel comfortable at higher effective temperatures than people living in a colder region.
• In summer the effective temperature is 21.6°C and in the case of winter, the optimum effective temperature is 20°C.

Age and Gender

• Children and old age persons need 2-3°C higher effective temperature in comparison to adults. Same the case is with the women.

Kind of activity

• If a person is involved in the foundry shop, dancing or jogging, etc needs a lower effective temperature in comparison to the person in the rest.

Density of occupants

• Highly densely occupied needs a lower effective temperature in comparison to the less densely occupied.

Comfort chart

Figure: Comfort chart

• ASHRAE (American Society of Heating Refrigeration and  Air conditioning Engineers), conducted a survey on different kinds of people subjected to a wide range of environmental temperature conditions, humidity purity, and air velocity and developed the above comfort chart. 
• If the value of relative humidity is above 60%, then the tendency of sticky sensation develops and if the value of relative humidity is less than 50%, then the skin surface is too dry. So the relative humidity for comfort air conditioning is 60%.