Thermal comfort of heterogeneous and dynamic indoor conditions - An overview

- We endeavour to summarise the studies regarding heterogeneous and dynamic indoors.
- Thermal and comfort perception to such non-uniformities and changes are analysed.
- Personalised comfort measures are over-viewed as they impact occupant micro-climate.
- Scrutiny suggests that variable indoors can co-exist with comfort and productivity.

The buildings sector, being a leading energy consumer, would need to lead in conservation efforts as well. There is a growing consensus that variability in indoor conditions can be acceptable to occupants, improve comfort perception, and lower building energy consumption. This work endeavours to scrutinise and summarise studies that examined human thermal and comfort perception to such variations in the indoor environment: spatial transients, non-uniformities, and temperature drifts. We also briefly discuss personalised comfort systems since they work on an occupant's micro-climate and create non-uniformities in the indoors. Perusal of works done on effect of non-thermal factors on thermal comfort, point to the need for synchronizing the overall indoor environment's quality - in terms of décor, air quality, lighting etc. - to improve occupant thermal comfort. Essence of the overall discussions come out to be that indoor thermal environment can be variable and still agreeable, implying existence of energy saving avenues, hitherto precluded from earnest consideration.