Thermal Comfort Assessment

VEGRA Info Ltd. provides services of thermal comfort assessment in buildings.

While poor thermal comfort is just one of the many indoor climate problems, it generates the greatest number of workers’ complaints. If preventing indoor climate problems is part of your company policy, then, the services we provide can be helpful for you.

As described in the definition, human thermal comfort is “that condition of mind which expresses satisfaction with the thermal environment”.

It depends on many other parameters in addition to indoor air temperature:

  • Measurable parameters – indoor air temperature, operative temperature, relative humidity, air velocity
  • Estimated parameters – clothing level and metabolic rate

According to classical theory of thermal comfort, developed by Prof. Fanger, human thermal comfort can be assessed by two indexes:

  • PMV – Predicted Mean Vote
  • PPD – Predicted Percent of Dissatisfied

The working method in order to evaluate human thermal comfort in a building consists of the measurements of indoor climatic parameters in some places/workstation located in the rooms/offices where thermal comfort needs to be assessed. The resultant indexes are compared with the values proposed by national and international standards and thus, thermal comfort is placed in classes and categories. Solutions can be found to improve human thermal comfort, by acting on the various parameters it depends on.

The figure below presents a thermal comfort assessment according to ASHRAE-55 standard, using CBE Thermal Comfort Tool and values of the measured indoor parameters.

CBE Thermal Comfort Tool – 2013, Center for the Built Environment, University of California Berkeley,

A good picture of the indoor thermal climate of the building section can be obtained if the measurements are done both in winter, under lower outdoor temperatures and in summer, under high heat load from the sun. If indoor thermal comfort problems under special climatic or load conditions are suspected, supplementary measurements when these occur would be advisable.

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