ISO 7730 for Thermal Environment Evaluation

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ISO 7730 is an International Standard for 'Ergonomics of the Thermal Environment-Analytical Determination and Interpretation of Thermal Comfort Using Calculation of the PMV and PPD and Local Thermal Comfort Criteria’. 
ISO 7730 illustrates methods to evaluate the general thermal sensation and the degree of discomfort for occupants exposed to moderate thermal environmental conditions. This Standard grouped the thermal environment into three different categories namely 
Category-A, 
Category-B and 
Category-C 

All there categories are described with the help of Table given below. Category-A describes narrow comfort conditions, whereas Category-C prescribes wider comfort bandwidth (-0.7 < PMV < +0.7).

The Standard describes the calculation of PMV and PPD indices for thermal comfort and for local discomfort. The Standard also defines the local clothing habits for indoor comfort and but does not provide information for clothing ensembles. Acceptable indoor environment can be extended by incorporating the behavioral adjustment such as use of window/door or control of room air speed. ISO 7730 is well accepted for evaluating indoor environmental conditions for moderate climatic conditions.

                                       Categories of thermal environment
Category
Thermal state of the body as a whole
Local discomfort
PPD
(%)
PMV
DR
(%)
PD (%) caused by
Vertical air
temperature
difference
Warm or
cool floor
Radiant
asymmetry
A
< 6
-0.2 <PMV <0.2
< 10
< 3
< 10
< 5
B
< 10
-0.5 < PMV < +0.5
< 20
< 5
< 10
< 5
C
< 15
-0.7 < PMV < +0.7
< 30
< 10
< 15
< 10
Source: ISO 7730, 2005; Note: PPD-Percentage Predicted Dissatisfied; PMV-Predicted Mean Vote; DR-Draught; PD-Percentage Dissatisfied

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