Indrika Rajapaksha

Indrika Rajapaksha
University of Moratuwa | UoM · Department of Architecture

Dr.Eng. (Nagoya), MSc(Arch), B.Sc.(BEnv) Hons.
Professor in Architecture, Department of Architecture, University of Moratuwa, Sri Lanka

About

44
Publications
40,926
Reads
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544
Citations
Citations since 2016
18 Research Items
369 Citations
2016201720182019202020212022020406080
2016201720182019202020212022020406080
2016201720182019202020212022020406080
2016201720182019202020212022020406080
Introduction
My research activities nurtured through research appointments and research collaborations in leading international universities. Center for Sustainable Design, University of Queensland, Brisbane, Australia, Bartlett School of Built Environment, University College of London, United Kingdom and Faculty of Architecture, Design and Planning , University of Sydney. My research and teaching is focused on Environmentally Sustainable Built environment for tropics.
Additional affiliations
August 2010 - June 2011
The University of Sydney
Position
  • PostDoc Position
September 2009 - April 2010
University College London
Position
  • Honorary Senior Research Fellow
December 2003 - present
University of Moratuwa
Position
  • Professor (Associate)

Publications

Publications (44)
Conference Paper
Full-text available
Forced displacement has emerged as a significant danger to the vulnerable community of internally displaced persons (IDPs), calling into question the resilience of their built environment. The case study aimed to examine the quality of life of IDPs in the Jaffna area of Sri Lanka based on occupant comfort, energy performance, built environment, and...
Conference Paper
Urbanization and population aging are two key phenomena in the twenty-first century that concerns the elders living in cities, especially those in low- and middle-income countries like Sri Lanka. In such a setting, understanding the responsiveness of the built environment for active aging is crucial. However, even the few available studies are prio...
Conference Paper
Rapid demographic transition with higher growth in ageing population demonstrate a major societal challenge in South Asia and Sri Lankans will age faster than other developing economies in the region. Climate shocks of people living in economically deprived countries will increase in future and elders are more vulnerable to the adverse effects of t...
Article
Internally displaced people due to conflict and violence were estimated as 41.3 million in 55 countries as the end of the year 2019, the highest figure ever recorded. Sri Lanka has not yet prioritized the health and wellbeing of households in building designing, with the emerging heat island effect making the lives more desperate for IDP. This stud...
Book
Impacts of climate change on UNESCO world heritage sites are evident and this phenomenon will instigate a major potential threat for all heritage properties around the globe in the future. United Nations 2030 agenda on Sustainable Development Goals prioritized the significance of cultural and environmental sustainability for human well-being and th...
Article
Full-text available
People's subjective response to any thermal environment is commonly investigated by using rating scales describing the degree of thermal sensation, comfort, and acceptability. Subsequent analyses of results collected in this way rely on the assumption that specific distances between verbal anchors placed on the scale exist and that relationships be...
Article
Full-text available
An amendment to this paper has been published and can be accessed via a link at the top of the paper.
Article
Full-text available
Thermal discomfort is one of the main triggers for occupants’ interactions with components of the built environment such as adjustments of thermostats and/or opening windows and strongly related to the energy use in buildings. Understanding causes for thermal (dis-)comfort is crucial for design and operation of any type of building. The assessment...
Conference Paper
Ageing population is a key global challenge in next several decades and majority of this demographic shift is confined in Asia. Thus a burgeoning demand on care homes for elders is evident and continues to grow. Elderly are more susceptible to the impacts of the extreme temperatures due to decreasing trend in the ability to regulate body temperatur...
Conference Paper
Full-text available
Urban parks are predominant constituents of an urban design which contributes to enhance the quality of life of city dwellers. Location of an urban park is an important design decision and the Public Outdoor Recreational Space (PORS) standard of Sri Lanka prioritizes the criterion of easy accessibility of park users. As the air pollution levels exa...
Article
Full-text available
Investigations of the Vernacular Architecture of Pompeii revealed that little work had been carried out on the way the buildings respond to climate and to what extent these buildings were comfortable to the occupant given modern day standards. An integrated methodology from archaeology and architectural science techniques was developed and using a...
Conference Paper
Traffic emission constitutes the ultrafine particles which play a major role in atmospheric nanoparticles induced health effects on pulmonary, cardiovascular and nervous systems. Thus there is a considerable scientific interest in personal exposure to ultrafine particles and this study presents an experimental investigation of pedestrian exposure t...
Article
Accommodation sector accounts for 21% of the global CO2 emissions and the competitiveness of tourism industry in future is primarily depended on hotel energy efficiency which plays a vital role in eco-efficiency of tourist operations. Tourists on pleasure travel prefer hotels which promote environmentally friendly built environment with free-runnin...
Conference Paper
Full-text available
Sustainable management of water and sanitation are at the core of 2030 agenda of Sustainable Development goals which is an ambitious plan of action to transform our world for people, planet and prosperity. United Nations report on world urbanization prospects reveals the world's urban population is expected to increase by more than two thirds by 20...
Conference Paper
The research presents a critique on unrealized heat sink capacity of Colombo's historic British period buildings. The work discusses how ongoing inappropriate retrofitting approaches to these buildings can hinder the passive heat sink capacity of high thermal mass envelopes. The research performed field investigations on selected renovated historic...
Conference Paper
Full-text available
The paper presents a design matrix for external double skin envelope (EDSE) in multilevel office buildings for energy sustainability in the tropics. The methodology involved on site field investigations and a DesignBuilder simulation study investigating heat sink and insulating capacities of EDSE with thermal mass, a shaded cavity, night ventilatio...
Conference Paper
Full-text available
The paper presents an investigation of the performance of thermal mass and night ventilation for passive cooling using a critical case study approach. The conceptual Model is based on literature and a pre-modern building in a historic world heritage site. The building was tested by a field investigation using thermal monitoring and a simulation stu...
Conference Paper
Though wider diversities of environmental attributes are intrinsic in water fringed urban parks, these parks are less represented in the previous studies. Thus the study aims to explore the impact of environmental attributes of settings on user perceived controls for enhancing daytime thermal acceptability of water fringed urban parks in Colombo, S...
Conference Paper
Full-text available
The paper investigates integration of thermal mass for passive climate modification in compact house forms found in historic world heritage site, Galle Fort in Sri Lanka. The work involves a field investigation and simulation on the thermal performance of thermal mass integrated with the building design for passive climate modification in warm humi...
Article
Urban environments typically experience increased average air temperatures compared to surrounding rural areas – a phenomenon referred to as the Urban Heat Island (UHI). The impact of the UHI on comfort in naturally ventilated buildings is the main focus of this article. The overheating risk in urban buildings is likely to be exacerbated in the fut...
Conference Paper
Full-text available
Net Zero Energy Buildings (NZEB) are currently an emerging performance target for sustainable commercial buildings. A central issue is how this target can be met either through the design of new buildings or retrofitting of existing buildings. From a review of the NZEB definitions it is argued a new conceptualisation is needed which maps specific c...
Book
Despite recent improvements in energy efficiency being made in new build, it is important that the existing commercial building sector also take action to meet emission reduction targets. The objectives and challenges of such action will reduce the risk of the sector becoming obsolete due to high energy use and poor environmental performance. This...
Conference Paper
Full-text available
The paper presents an evidence base model for environmental retrofitting of an existing non-domestic buildings in warming climates. The model is grounded in bioclimatic design, and uses a four-phase methodology; mapping thermal load profiles, monitoring interventions for performance improvement with current and future climates and presenting eviden...
Article
Full-text available
The urban heat island (UHI) is a well-known effect of urbanisation and is particularly important in world megacities. Overheating in such cities is expected to be exacerbated in the future as a result of further urban growth and climate change. Demonstrating and quantifying the impact of individual design interventions on the UHI is currently diffi...
Conference Paper
The current dominant social paradigm cannot address the environmental crisis forecast by climate science and a new approach is needed. The requirement for buildings that can operate in energy-poor conditions with water and resource scarcity can be facilitated by an examination of pre-modern buildings. A research project called the Green Renaissance...
Conference Paper
There is a complex interplay of issues associated with retrofitting high-rise office buildings in warm climates. This paper explores non-technological and technological interventions for retrofitting and the potential environmental benefits associated with them. An approach is developed in the context of bioclimatic renovation design for existing h...
Conference Paper
Full-text available
This paper reports the testing of appropriate design standards to optimize energy performance in the pursuit of building retrofits. The impact of whole-building "best" and "normal" practice standards are predicted and evaluated using as a case study a forty-year-old heavy core-dependent deep-plan twenty-three storey office building in Brisbane. Pre...
Book
The book " Bioclimatic Housing " arrives at the right moment, when the actual Climate Change put on the table the important responsibility to redefine concepts and principles of the City design. It is always more and more difficult to ensure the standard urban comfort, that our society has reached in the last century, without compromise the future...
Book
Full-text available
In the search for sustainable architecture, there is growing interest in the relationship between nature and design. In this vital new book, the term bioclimatic, relating to the dynamic between climate and living organisms, is applied by the authors in focusing on countries where housing requires cooling for a significant part of the year. In this...
Conference Paper
Full-text available
This paper explore the effects of indoor airflow behaviour in modifying the indoor thermal conditions in a courtyard residence found in the tropics. The design theme is centred towards an exploitation of architectural concepts and principles of the traditional courtyard built forms of the country as a source of deriving passive design strategies. F...
Conference Paper
The paper presents a tropical courtyard as a design strategy in promoting indoor air movement within a single storey dwelling. The results of a computer simulation (CFD) carried out for indoor airflow pattern reveals that wind entering from the openings of the external envelope travels through the indoor spaces and finally discharges into the sky f...
Article
Full-text available
The paper investigates the potential of a courtyard for passive cooling in a single storey high mass building in a warm humid climate. The inclusion of an internal courtyard in building design is attributed to the optimization of natural ventilation in order to minimize indoor overheating conditions. However, the efficiency of this strategy greatly...
Article
This paper investigates the effects of airflow patterns and airflow rates on thermal behavior of a ventilated courtyard building in a warm humid climate. With some airflow patterns indoor air temperature can be brought to a level below the ambient, while with others the indoor air temperature may be higher than the ambient. The integration of a cou...
Conference Paper
This paper assesses the effects of indoor airflow behavior modifying the indoor air temperature on thermal comfort conditions in a residential tropical courtyard building where courtyard maintains direct contacts with outdoor environment through openings found in the envelope. Results taken from a field investigation and a computer simulation revea...

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Projects

Projects (3)
Project
Indoor air pollution is a major global public health threat requiring greatly increased efforts in the areas of research and policy making. Respiratory illnesses are accountable for second leading cause of hospitalization in Sri Lanka over past 5 years and the second foremost cause for death of children aged 5 to 14 years. Characteristically urban schools are located along and close proximity to major road ways and majority of the classrooms are primarily naturally ventilated. This research will instigate a platform to promote healthy classrooms and school environments by formulating indoor air quality guidelines. Moreover formulates Master Planning Guidelines for urban school designs to buffer traffic emission pollution.