The effect of vegetation on indoor and outdoor thermal comfort conditions: Evidence from a microscale study of two similar urban buildings in Akure,Nigeria
Restricted accessResearch articleFirst published online July, 2016
The effect of vegetation on indoor and outdoor thermal comfort conditions: Evidence from a microscale study of two similar urban buildings in Akure,Nigeria
This study assessed thermal conditions in and around two typical buildings on a university campus in Akure, Nigeria. One of the buildings was shaded by trees, while the other was unshaded. The aim is to evaluate the effect of vegetation (tree shading) on indoor and outdoor thermal comfort. Air temperature and relative humidity were measured simultaneously inside and outside both buildings for six months (September 2010 to February 2011). Results show that the unshaded building is generally less comfortable in comparison with the tree-shaded one, especially during the daytime. The unshaded building becomes less comfortable as early as 10:00 h during the dry season, and that can even extend till around 18:00 h during the wet season. Also, the outdoor area around the tree-shaded building is more thermally comfortable than around the unshaded one, irrespective of the season. A strong relationship between outdoor and indoor comfort conditions, irrespective of seasonal or diurnal variations and thermal comfort index, also emerged. While the positive role of tree shading in thermal comfort is not new, this study contributes additional evidence from an understudied sub-Saharan African region like Nigeria. It points to the need for tree planting (greening) as a means to improve thermal comfort in Nigerian cities.
IPCC. Climate change 2013: the physical science basis. In: Stocker TF, Qin D, Plattner G-K, Tignor M, Allen SK, Boschung J, Nauels A, Xia Y, Bex V and Midgley PM (eds) Contribution of working group I to the fifth assessment report of the intergovernmental panel on climate change. Cambridge: Cambridge University Press, 2013.
2.
ISO 7730:2005. Moderate thermal environments – determination of the PMV and PPD indices and specification of the conditions for thermal comfort, Geneva: International Organization for Standardization, 2005.
3.
Latini G, Grifoni R and Tascini S. Thermal comfort and microclimates in open spaces. In: Proceedings Building XI Conference, Paper 79, Florida: USA, December 5–9 2010.
4.
NikolopoulouMBakerNSteemersK. Thermal comfort in outdoor urban spaces: understanding the human parameter. Sol Energy2001; 70: 227–235.
5.
GivoniBNoguchiMSaaroniHPochterOYaacovYFellerNBeckerS. Outdoor comfort research issues. Energ Build2003; 35: 77–86.
6.
SpagnoloJDe DearR. A field study of thermal comfort in outdoor and semi-outdoor environments in subtropical Sydney Australia. Build Environ2003; 38: 721–738.
7.
LipTP. Thermal perception, adaptation and attendance in a public square in hot and humid regions. Build Environ2009; 44: 2017–2026.
8.
TungCChenCTsaiKKantorNHwangRMatzarakisALinT. Outdoor thermal comfort characteristics in the hot and humid region from a gender perspective. Int J Biometeorol2014, pp. 1–13.
9.
WrightAYoungANatrajanS. Dwelling temperatures and comfort during the August 2003 heat wave. Build Serv Eng Res T2005; 26: 285–300.
10.
OrosaJOliveiraA. Hourly indoor thermal comfort and air quality acceptance with passive climate control methods. Renew Energ2009; 34: 2735–2742.
11.
ChenAChangV. Human health and thermal comfort of office workers in Singapore. Build Environ2012; 58: 172–178.
12.
MasmoudiSMazouzS. Relation of geometry, vegetation and thermal comfort around building in urban settings: the case of hot arid regions. Energ Build2004; 36: 710–719.
13.
RobituMMusyMInardCGroleauD. Modeling the influence of vegetation and water pond on urban micro-climate. Sol Energ2006; 80: 435–447.
14.
SpangenbergJShinzatoPJohanssonEDuarteD. Simulation of the influence of vegetation on microclimate and thermal comfort in the city of Sao Paulo. Revista SBAU2008; 3: 1–19.
15.
BowlerDBuyung-AliLKnightTPullinA. Urban greening to cool towns and cities: a systematic review of the empirical evidence. Landsc Urban Plan2010; 97: 145–155.
16.
Shashua-BarLPearlmutterDErellE. The influence of trees and grass on outdoor thermal comfort in a hot-arid environment. Int J of Climatol2011; 31: 1498–1506.
17.
ArmsonDStringerPEnnosA. The effect of tree shade and grass on surface and globe temperatures in an urban area. Urban Forestry Urban Greening2012; 11: 245–255.
18.
IrmakMAYilmazSYilmazHOzerSToyS. Evaluation of different thermal conditions based on THI under different kind of tree types – as a specific case in Ata botanic garden in eastern Turkey. Global Nest J2013; 15: 131–139.
19.
LinBXiaofengZhuLQinY. Numerical simulation studies of the different vegetation patterns’ effects on outdoor pedestrian thermal comfort. J Wind Eng Ind Aerod2008; 96: 1707–1718.
20.
SchwerdtfegerF. Thermal conditions in traditional urban house in Northern Nigeria. Habitat Int1984; 8: 43–76.
21.
GulmaMLorenzoSFalaiyeJ. Passive solar houses in northern Nigeria: the West African sub-region. Solar Wind Technol1989; 6: 427–431.
22.
Adunola AO and Ajibola K. Thermal comfort considerations and space use within residential buildings in Ibadan, Nigeria. In: Proceedings of 7th Windsor conference: the changing context of comfort in an unpredictable world Cumberland Lodge, Windsor, UK, April 12–15 2012, Paper 1206b. London: Network for Comfort and Energy Use in Buildings.
23.
AdunolaAO. Evaluation of urban residential thermal comfort in relation to indoor and outdoor air temperatures in Ibadan, Nigeria. Build Environ2014; 75: 190–205.
24.
OmonijoAGMatzarakisA. Climate and bioclimate analysis of Ondo State, Nigeria. Meteorol Z2011; 20: 531–539.
25.
EludoyinOMAdelekanIO. The physiologic climate of Nigeria. Int J Biometeorol2012; 57: 241–264.
26.
OmonijoAGAdeofunCOOguntokeOMatzarakisA. Relevance of thermal environment to human health: a case study of Ondo State, Nigeria. Theor Appl Climatol2013; 113: 205–212.
27.
EludoyinOMAdelekanIOWebsterREludoyinAO. Air temperature, relative humidity, climate regionalisation and thermal comfort of Nigeria. Int J Climatol2014; 34(6): 2000–2018.
28.
AyoadeJO. Introduction to climatology for the tropics, Ibadan: Spectrum Books Ltd, 1993.
29.
AkinbodeOMEludoyinAOFashaeOA. Temperature and relative humidity distribution in a medium-size administrative town in southwest Nigeria. J Environ Manage2008; 87: 95–105.
30.
MorakinyoTBalogunAAdegunO. Comparing the effect of trees on thermal conditions of two similar urban buildings. Urban Climate2013; 3: 76–93.
31.
EludoyinOM. Some aspects of physiologic climatology in Nigeria. Interdiscip Environ Rev2013; 14: 150–185.
32.
BhattacharyaRPalSBiswasGKarmakarSBanikR. An estimation of heat stress in tropics. Int J Eng Sci Tech2012; 4: 4302–4307.
33.
YilmazSToySYilmazH. Human thermal comfort over three different land surfaces during wet season in the city of Erzurum, Turkey. Atmósfera2007; 20: 289–297.
34.
UngerJ. Comparisons of urban and rural bio-climatological conditions in the case of a Central-European city. Int J Biometeorol1999; 43: 139–144.
35.
Lee, DHK and Henschel A. Evaluation of the thermal environment in shelters. Technical Report. Cincinnati, OH: US Dept of Health, Education and Welfare, Division of Occupational Health, 1963.
36.
GilesBDBalafoutisCMaherasP. Too hot for comfort: the heatwaves in Greece in 1987 and 1988. Int J Biometeorol1990; 34: 98–104.
37.
Kyle WJ. Summer and winter patterns of human thermal stress in Hong Kong. In: Proceedings of the 2nd International Conference on East Asia and Western Pacific Meteorology and Climate. Hong Kong: World Scientific, 1992, pp. 575–583.
38.
BalogunAABalogunIAAdeyewaZD. Comparisons of urban and rural heat stress conditions in a hot–humid tropical city. Global Health Action2010; 3: 1–5. DOI: 10.3402/gha.v3i0.5614.
39.
WyonDAndersenIBLundquistG. The effects of moderate heat stress on mental performance. Scand J Work Environ Health1979; 5: 352–361.
40.
EnanderAEHyggeS. Thermal stress and human performance. Scand J Work Environ Health1990; 16: 44–50.
41.
MendellMHeathG. Do indoor pollutants and thermal conditions in schools influence student performance? A critical review of the literature. Indoor Air2005; 15: 27–52.
42.
LanLWargockiPLianZ. Quantitative measurement of productivity loss due to thermal discomfort. Energ Build2011; 43: 1057–1062.
43.
KjellstromTHolmerILemkeB. Workplace heat stress, health and productivity: an increasing challenge for low and middle income countries during climate change. Global Health Action2009; 2: 1–3. DOI: 10.3402/gha.v2i0.2047.
44.
MohammadSSapriMSipanI. Academic buildings and their influence on students’ wellbeing in higher education institutions. Social Indic Res2014; 115: 1159–1178.
45.
Kyle WJ. The human bioclimate of Hong Kong. In: Proceedings of the Contemporary Climatology Conference. Brno: TISK LITERA, 1994.
