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what do you mean by comfort charts and how they are uesd

Subject:- Refrigeration and Air Conditioning

Topic:- Design of air conditioning systems

Difficulty:- Low

1 Answer
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Comfort charts are the practical application of concept of effective temperature. This chart is the result of research made on different kinds of people subjected to wide range of environmental temperature, relative humidity and air movement by ASHRAE (American Society of Heating, Refrigeration and Air conditioning Engineers).

The DBT is taken as abscissa and WBT as ordinate. The relative humidity lines are replotted from psychrometric chart. Statistically prepared graphs corresponding to summer and winter season are also superimposed. The chart is prepared showing percentage of people feeling comfort at different effective temperatures.

From comfort chart, engineers find the effective temperature for a point corresponding to a particular DBT,WBT and RH. Now there are several combinations of temperatures and humidity that will have the same effective temperature and will give the same feeling of comfort and warmth.

The chart thus allows engineers to choose most economical room conditions from a zone of suitable comfort conditions for summer and winter.

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