NCEUB

Network for Comfort and Energy Use in Buildings Research

Ph D 9

Title of thesis Thermal comfort in urban residential buildings in Lagos metropolis
Abstract The research aims at examining thermal comfort in urban residential buildings in Lagos Metropolis. The thermal characteristics of the outdoor and indoor conditions of some selected naturally ventilated houses in the study area are examined while also identifying the combination of environmental and personal parameters that provide for thermal comfort and affect behavioural thermal controls. Literature was reviewed on (a) general considerations of climate and architecture, (b) man's physiological response to the thermal environment, © development and application of thermal comfort indices and (d) means of controlling indoor thermal conditions in the study area.
The research was carried out using a field comfort survey in 349 urban communities in Lagos Metropolis. The population of the study was drawn from two main groups comprising of 349 residential houses, each house from an urban community. The household group consists of an average of 5 persons in a selected house. The survey was conducted during the rainy and dry seasons; this gives a total of 3,490 respondents involved in the survey. Electronic instruments were used for taking objective measurements while structured questionnaires adopted from the specifications of the international organization for standardization (ISO7730) were used in obtaining subjective measurements. The data collected were then analysed using simple descriptive statistics which include means, frequencies, standard deviation and inferential statistics which include T-test, Analysis of Variance (ANOVA), Multiple Regression Analysis and the Pearson Product Moment Correlation Coefficient ®.
Findings of the study indicated that generally, the outdoor thermal conditions are more comfortable than the indoor thermal conditions. The results also revealed that the people are comfortable at temperatures higher than that predicted by the predicted mean vote {PMV} and the six factors taken into account by PMV cannot best describe thermal comfort and as such adaptive actions might have contributed to the higher level of thermal comfort experienced. In addition, the use of behavioural controls has no significant relationship with the outdoor and indoor temperatures in the rainy season while for the dry season, much drinking & bathing have a significant relationship with the outdoor temperature. Occupants adaptive adjustments in the preferential order are switching on of fan, opening windows, taking bath, drinking more water and changing clothes; thus the use of controls is clearly influenced by physical conditions and tends to be governed by a stochastic rather than a precise relationship. The results also showed that there is a strong positive relationship between roofing, ceiling and wall and the corrected effective temperature {CET} during both seasons.
The research concludes that houses in Lagos Metropolis are generally not thermally comfortable. In general, heat gains from the environment and lack of adequate air movement are the major causes of unfavourable indoor thermal conditions in Lagos Metropolis. The solution to these problems lies in adequate provision of solar control systems and proper ventilation.
This research recommends that Meteorologists, Architects, Building Scientists, and Planners should cooperate to create a data bank with climatic information in a user friendly form and the National Building code should incorporate climatological research information. The research also recommends the integration of building simulations with human thermo-regulatory simulation.
Researcher / Institution Michael Adeloye Adebamowo,
Department of Geography and Planning, Lagos State University,Ojo, Lagos, Nigeria
Status / Publication date Thesis completed 2007
Keywords Thermal comfort; Thermal comfort models and adaptive models; Behavioural thermal controls; Thermal properties of buildings
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Contact details Michael Adebamowo adebamowomichael@yahoo.com