Influence of Passive Design Parameters on Thermal Comfort of an Office Space in a Building in Delhi
Publication: Journal of Architectural Engineering
Volume 26, Issue 3
Abstract
Energy efficiency measures in buildings, along with maintaining indoor thermal comfort, are increasingly drawing attention. The most widely accepted indices, Predicted Mean Vote (PMV) and Percentage People Dissatisfied (PPD), have been used in this study for evaluating thermal comfort of a small office room in Delhi. Various parameters influencing thermal comfort have been measured for two months and the observations have been used for assessing the PMV and PPD, which have then been compared with the simulation results from IDA ICE 4.7 Beta software, and found to be in agreement. Moreover, a comparison of the PMV values has been done with other indices such as Tropical Summer Index (TSI) and Corrected Effective Temperature (CET). Parametric study for the office room has also been performed to predict the shifts in the comfort levels by changing types and thicknesses of wall as well as roof insulations, provision of blinds, and types of window glazing, using which, the best possible solution to enhance the thermal environment of the office room has been proposed.
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Acknowledgments
The authors are thankful to Global Evolutionary Energy Design (GEED), New Delhi, India, where the experimental work for the study was conducted. The authors are also thankful to Yardi Software Pvt. Ltd. for providing the funding and IIT Delhi for providing necessary facilities and support for this research.
Notation
The following symbols are used in this paper:
- ADu
- dubois area (m2);
- CET
- corrected effective temperature (°C);
- Cres
- heat exchange by convection in breathing (W/m2);
- Ec
- heat exchange by evaporation on skin (W/m2);
- Eres
- evaporative heat exchange in breathing (W/m2);
- e
- root mean square percentage deviation;
- fcl
- clothing surface area factor;
- H
- sensitive heat losses (W/m2);
- Ht.
- height of a person (cm);
- hc
- convective heat transfer coefficient (W/m2 K);
- Icl
- clothing insulation (m2 K/W);
- L
- thermal load on the body of an occupant (W/m2);
- M
- metabolic rate (W/m2);
- N
- number of readings;
- PMV
- predicted mean vote;
- PMVTSI
- TSI values in terms of PMV;
- PMVCET
- CET values in terms of PMV;
- PPD
- percentage people dissatisfied;
- pa
- water vapor partial pressure (kPa);
- ps
- partial vapor pressure of saturated air (kPa);
- RH
- relative humidity;
- TSI
- tropical summer index (°C);
- ta
- air temperature (°C);
- tcl
- surface temperature of clothing (°C);
- tg
- globe temperature (°C);
- tr
- mean radiant temperature (°C);
- tsk
- external skin temperature (°C);
- tW
- wet bulb temperature (°C);
- va
- velocity of air (m/s);
- var
- relative velocity of air (m/s);
- W
- effective mechanical power (W/m2);
- Wt.
- weight of a person (kg);
- Xi
- values of parameters obtained through simulations; and
- Yi
- values of parameters obtained analytically.
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Information & Authors
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Published In
Journal of Architectural Engineering
Volume 26 • Issue 3 • September 2020
Copyright
© 2020 American Society of Civil Engineers.
History
Received: Apr 23, 2019
Accepted: Nov 26, 2019
Published online: Apr 22, 2020
Published in print: Sep 1, 2020
Discussion open until: Sep 22, 2020
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