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Indoor thermal quality also known as thermal comfort!
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July 29, 2021

Indoor thermal quality also known as thermal comfort!

How to measure indoor climate?

In the previous post “How to measure indoor climate? IAQ in focus!” (link here) we talked about indoor environmental quality (IEQ) composing from indoor air quality (IAQ), indoor thermal quality (ITQ – also known as thermal comfort), indoor lighting quality (ILQ – also known as visual comfort) and indoor sound quality (ISQ – also known as acoustic comfort). And the IAQ, parameters and measurements were described.

What is ITQ?

ITQ is the indoor thermal quality also known as thermal comfort. Thermal conditions play a critical role in influencing occupant comfort and wellbeing. And usually, the thermal environmental conditions are usually specified as conditions for healthy adults at atmospheric pressure equivalent or below altitude up to 3,000 m and in indoor spaces for human occupancy for periods of not less than 15 minutes (i.e adaptive thermal comfort).

What are ITQ parameters?

Thermal comfort is affected by two types of parameters.

1.physical parameters such as air temperature (alternatively operative air temperature), vertical air temperature difference, mean radiant temperature, radiant temperature asymmetry (otherwise floor surface temperature), relative humidity and air speed (velocity including draughts and ventilation), and

2.physiological parameters such as metabolic rate and clothing insulation.

How to measure ITQ?

The values for quality of the thermal environment for the representative occupant of space shall be as air velocity up to /above  0.2 m/s, measured in winter and summer conditions, level of activity – low / medium, not in direct sunlight. There are threshold values for indoor thermal quality parameters stated for example in ISHRAE IEQ Standard and the ISO 16000 Standards.

ITQ should be measured at the centre of the room or space and one meter inward from the centre of each of the walls. Note that in the case of exterior walls with windows, the measurement location shall be 1.0 m inward from the centre of the largest window.

The representative sample locations shall be the locations where the most extreme values of the thermal parameters are observed or estimated to occur (e.g., potentially occupied areas near windows, diffuser outlets, corners, and entries).

Read more!

How to measure indoor climate? IAQ in focus!

Transitioning from IAQ to IEQ!

Can only 12 parameters evaluate the IEQ in buildings?

IEQ benefits: Good ventilation leads to healthy buildings!

What are the impacts of thermal and indoor air quality on the performance of office work?