High temperatures, an extremely polluted ambient environment, alongside disparities in housing quality and household energy use, indicate overheating risk and poor indoor air quality in Delhi dwellings. In this study, we explore a range of interventions to reduce adverse temperature exposure and improve indoor air quality, focusing on PM2.5, for exemplar base case households developed to cover the range of settlements types found in Delhi. Interventions are modelled using dynamic thermal simulation, and include a range of modifications to dwelling operation and building fabric, as well as additional building components. A weighted multi-objective assessment considering annual energy use, intervention cost, and a health metric encompassing heat, cold and PM2.5 exposure, is employed to score the suitability of strategies for each settlement type. The most effective strategy is found to be a combination of changes in building fabric with evaporative cooling and cooking ventilation in all archetypes. The results demonstrate how a weighted multi-objective assessment is effective in selecting strategies for settlement types with differing priorities.
Practical application: Current dwellings in Delhi risk significant energy consumption or provide inadequate indoor environmental quality. This work presents the performance of potential interventions, by considering multiple criteria, which could be deployed in Delhi households to provide low-energy healthy homes.
Government of National Capital Territory of Delhi. Delhi Economic Survey. 2013.
2.
TERI. Managing power demand, A case study of the residential sector in Delhi. 2007.
3.
Government of India NSSO-M of S& PI. Household consumption of various goods and services in India 2009-10 – NSS 66th. 2010.
4.
FirdausGAhmadA. Relationship between housing and health: A cross-sectional study of an urban centre of India. Indoor Built Environ2012; 22(3): 498–507.
5.
SahaSK. Built Form of Shahjahanabad (Old Delhi): An evaluation from the climatic point of view. Energy Build1990; 16(1): 895–906.
6.
LallABPanditMAppasamyP. Climate and housing form - A case study of New Delhi. Energy Build1990; 16: 837–849.
7.
KulshreshthaPKhareMSeetharamanP. Indoor air quality assessment in and around urban slums of Delhi city, India. Indoor Air2008; 18(6): 488–498.
8.
KhillarePSPandeyRBalachandranS. Characterisation of indoor PM10 in residential areas of Delhi. Indoor Built Environ2004; 13(2): 139–147.
9.
DhakaSMathurJGargV. Combined effect of energy efficiency measures and thermal adaptation on air conditioned building in warm climatic conditions of India. Energy Build2012; 55: 351–360.
10.
RameshTPrakashRShuklaKK. Life cycle energy analysis of a residential building with different envelopes and climates in Indian context. Appl Energy2012; 89(1): 193–202.
11.
SinghMKMahapatraSAtreyaSK. Solar passive features in vernacular architecture of North-East India. Sol Energy2011; 85(9): 2011–2022.
12.
NayakJKSodhaMSSrivastavaA. Design and analysis of a passive heated/cooled building for composite climate of India. Energy Convers Manage1985; 25(1): 93–100.
13.
Nix E, Das P and Davies M. Modelling the disparities in energy consumption, indoor temperature, and PM2.5 exposure across Delhi's housing stock. In: Building simulation and optimisation conference, UCL, 2014. London: IBSPA.
14.
DasPChalabiZJonesB. Multi-objective methods for determining optimal ventilation rates in dwellings. Build Environ2013; 66: 72–81.
15.
PorrittSMCropperPCShaoL. Ranking of interventions to reduce dwelling overheating during heat waves. Energy Build2012; 55: 16–27.
16.
US DOE EERE. EnergyPlus energy simulation software, version 8.0. 2013.
17.
ShrubsoleCRidleyIBiddulphP. Indoor PM2.5 exposure in London's domestic stock: Modelling current and future exposures following energy efficient refurbishment. Atmos Environ2012; 62: 336–343.
18.
MavrogianniAWilkinsonPDaviesM. Building characteristics as determinants of propensity to high indoor summer temperatures in London dwellings. Build Environ2012; 55: 117–130.
19.
KumarASumanBM. Experimental evaluation of insulation materials for walls and roofs and their impact on indoor thermal comfort under composite climate. Build Environ.201; 59: 635–643. .
20.
RameshTPrakashRShuklaKK. Life cycle energy analysis of buildings: An overview. Energy Build2010; 42(10): 1592–1600.
21.
TERI, Fraunhofer Institute for Building Physics. EnEff: ResBuild India.
22.
Government of India NSSO-M of S & PI. Housing condition and amenities in India 2008–09 – NSS 65th Round. 2010.
23.
SaksenaSPrasadRKShankarVR. Daily Exposure to air pollutants in indoor, outdoor and in-vehicle micro-environments: A pilot study in Delhi. Indoor Built Environ2007; 16(1): 39–46.
24.
University of Illinois, Ernest Orlando Lawrence Berkeley National Laboratory. Input Output Reference for EnergyPlus. 2012.
25.
Indian Society of Heating Refrigerating and Air-Conditioning Engineers. New Delhi Weather File.
26.
Government of National Capital Territory of Delhi. Central Pollution Control Board. http://www.cpcb.gov.in.
27.
GolneshanAAYaghoubiMA. Simulation of ventilation strategies of a residential building in, hot arid regions of Iran. Energy Build1990; 14: 201–205.
28.
FabianMPAdamkiewiczGStoutNK. A simulation model of building intervention impacts on indoor environmental quality, pediatric asthma, and costs. J Allergy Clin Immunol2014; 133(1): 77–84.
29.
NguyenA-TReiterS. A climate analysis tool for passive heating and cooling strategies in hot humid climate based on Typical Meteorological Year data sets. Energy Build2014; 68(C): 756–763.
30.
IbrahimEShaoLRiffatSB. Performance of porous ceramic evaporators for building cooling application. Energy Build2003; 35(9): 941–949.
SantamourisMPavlouKSynnefaA. Recent progress on passive cooling techniques: Advanced technological developments to improve survivability levels in low-income households. Energy Build2007; 39(7): 859–866.
33.
DasPNixEChalabiZ. Exploring the health/energy pareto-optimal front for adapthing dwellings in the Delhi environment. Building simulation and optimisation conference, UCL2014. 2014, London: IBSPA.
34.
Government of India Central Public Works Department. Delhi Schedule of Rates 2013. 2013.
35.
McMichaelAJWilkinsonPKovatsRS. International study of temperature, heat and urban mortality: The “ISOTHURM” project. Int J Epidemiol2008; 37(5): 1121–1131.
36.
GuttikundaSKGoelR. Health impacts of particulate pollution in a megacity—Delhi, India. Environ Develop2013; 6: 8–20.
37.
CohenAJRoss AndersonHOstroB. The global burden of disease due to outdoor air pollution. J Toxicol Environ Health Part A2005; 68(13–14): 1301–1307.
38.
KrzyzanowskiMCohenA. Update of WHO air quality guidelines. Air Qual Atmos Health2008; 1(1): 7–13.
39.
SinghMKMahapatraSAtreyaSK. Thermal performance study and evaluation of comfort temperatures in vernacular buildings of North-East India. Build Environ2010; 45(2): 320–329.
40.
IndragantiM. Thermal comfort in apartments in India: Adaptive use of environmental controls and hindrances. Renew Energy2011; 36(4): 1182–1189.
41.
HegdeLS. Indoor air temperatures and energy use?: A comparative field study of vernacular, conventional, and construction in India. Environ Qual Manage2010; 19: 51–71.
42.
DiliASNaseerMAVargheseTZ. Thermal comfort study of Kerala traditional residential buildings based on questionnaire survey among occupants of traditional and modern buildings. Energy Build2010; 42(11): 2139–2150.
