Thermal comfort of heterogeneous and dynamic indoor conditions — An overview

A.K. Mishra, M.G.L.C. Loomans, J.L.M. Hensen
2016 Building and Environment  
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
more » ... efly discuss personalised comfort systems since they work on an occupant's micro-climate and create nonuniformities 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 e in terms of d ecor, air quality, lighting etc. e 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. Building and Environment 109 (2016) 82e100 2.2. Local discomfort, asymmetry, ramps and drifts ASHRAE Standard 55 explores only certain specific transient scenarios [13] . According to the standard, impact of prior exposure/ activity levels may last up to 1 h. Requirements presented regarding local thermal discomforts, from causes like draft, thermal asymmetry etc., are for occupants with clothing insulation less than 0.7 clo and activity level less than 1.3 met. Above these levels, no local discomfort limits are prescribed. It is also mentioned that occupants are more sensitive to local issues in a cooler environment. EN15251 [15] refers to the ISO 7730 [16] (or specific national codes) for the local thermal discomfort criteria and temperature drifts/ ramps. ISO 7730 proposes use of PMV model, with reasonable approximation, if one or more variables have minor fluctuations, as Fig. 1. A representation of the article's architecture and the interconnection between different sections. A.K. Mishra et al. / Building and Environment 109 (2016) 82e100
doi:10.1016/j.buildenv.2016.09.016 fatcat:fxebtqq4qrcupbv5z36budyply