Overheating in retrofitted flats: occupant practices, learning and interventions

ABSTRACT The overheating risk in flats (apartments) retrofitted to energy-efficient standards has been identified by previous studies as one that is particularly high. With climate change and rising mean temperatures this is a growing concern. There is a need to understand the kinds of practices, learning and interventions adopted by the occupants of individual homes to try to reduce overheating, as this area is poorly understood and under-researched. This case study focuses on the impact of different home-use practices in relation to the severity of overheating in 18 flats in one tower block in northern England. Internal temperatures monitored in comparable flats show that the percentage of time spent above the expected category II threshold of thermal comfort according to BS EN 15251 can differ by over 70%. Extensive monitoring, covering a full year, including two summer periods, has identified emergent changes in heatwave practices linked with increased home-use skills and understanding among the research participants. Close analysis of design intentions versus reality has identified key physical barriers and social learning opportunities for appropriate adaptation in relation to heatwaves. Recommendations for designers and policy-makers are highlighted in relation to these factors.

[1]  Guerra-Santin Olivia,et al.  In-use monitoring of buildings: An overview and classification of evaluation methods , 2015 .

[2]  J. Houghton,et al.  Climate Change 2013 - The Physical Science Basis: Working Group I Contribution to the Fifth Assessment Report of the Intergovernmental Panel on Climate Change , 2014 .

[3]  Maria Kolokotroni,et al.  Modelling the relative importance of the urban heat island and the thermal quality of dwellings for overheating in London , 2012 .

[4]  Val Mitchell,et al.  A persona-based approach to domestic energy retrofit , 2014 .

[6]  T. Muneer.  Solar radiation: Further evaluation of the Muneer model , 1990 .

[7]  Wiktoria Glad,et al.  Housing renovation and energy systems: the need for social learning , 2012 .

[8]  Adrian Leaman,et al.  Building evaluation: practice and principles , 2010 .

[9]  Xiaoxin Wang,et al.  Thermal mass in new build UK housing: A comparison of structural systems in a future weather scenario , 2012 .

[10]  M. Davies,et al.  Urban social housing resilience to excess summer heat , 2015 .

[11]  Fergus Nicol,et al.  Post-occupancy evaluation and field studies of thermal comfort , 2005 .

[12]  Fionn Stevenson,et al.  Mechanical ventilation in housing: understanding in-use issues , 2017 .

[13]  Antonio Gagliano,et al.  Thermodynamic analysis of ventilated façades under different wind conditions in summer period , 2016 .

[14]  R. Yin.  Case Study Research: Design and Methods , 1984 .

[15]  Michael Davies,et al.  Investigation into overheating in homes: Literature review, Chapter 3: How do UK dwellings modify the external conditions? , 2012 .

[16]  O. Edenhofer,et al.  Intergovernmental Panel on Climate Change (IPCC) , 2013 .

[17]  Kirsten Gram-Hanssen,et al.  Incorporating inhabitants’ everyday practices into domestic retrofits , 2014 .

[18]  M. Whitehead,et al.  Cities, Urbanisation and Climate Change , 2013 .

[19]  T. Muneer.  Detailed solar radiation modelling for the United Kingdom , 1987 .

[20]  Michael A. Humphreys,et al.  ADAPTIVE THERMAL COMFORT AND SUSTAINABLE THERMAL STANDARDS FOR BUILDINGS , 2002 .

[21]  Kevin J. Lomas,et al.  Thermal comfort standards, measured internal temperatures and thermal resilience to climate change of free-running buildings: A case-study of hospital wards , 2012 .

[22]  Kathryn B. Janda,et al.  Buildings don't use energy: people do , 2011 .

[23]  Alexandra Schneider,et al.  The impact of heat waves on mortality in 9 European cities: results from the EuroHEAT project , 2010, Environmental health : a global access science source.

[24]  Steven K. Firth,et al.  National survey of summertime temperatures and overheating risk in English homes , 2013 .

[25]  C. Gueymard,et al.  Hourly Slope Irradiation and Illuminance , 2004 .

[26]  Eve Stirling,et al.  Exploring the Relationship Between a 'Facebook Group' and Face-to-Face Interactions in 'Weak-Tie' Residential Communities , 2016, SMSociety.

[27]  Chris I. Goodier,et al.  Ranking of interventions to reduce dwelling overheating during heat waves. , 2012 .

[28]  T. Muneer.  Solar radiation and daylight models , 2004 .

[29]  I. van Kamp,et al.  Mechanical ventilation in recently built Dutch homes: technical shortcomings, possibilities for improvement, perceived indoor environment and health effects , 2012 .

[30]  Martyn Hammersley,et al.  Ethnography : Principles in Practice , 1983 .

[31]  Zaid Chalabi,et al.  Impact of climate change on the domestic indoor environment and associated health risks in the UK. , 2015, Environment international.

[32]  Zakary L. Tormala.  The role of certainty (and uncertainty) in attitudes and persuasion , 2016 .

[33]  Andrew Peacock,et al.  Investigating the potential of overheating in UK dwellings as a consequence of extant climate change , 2010 .

[34]  Carine Dubrul,et al.  Inhabitant behaviour with respect to ventilation - a summary report of IEA annex VIII , 1988 .

[35]  K. Lomas,et al.  Summertime temperatures and thermal comfort in UK homes , 2013 .

[36]  Cristina Sanjuan,et al.  Energy evaluation of an horizontal open joint ventilated façade , 2012 .

[37]  Fionn Stevenson,et al.  The usability of control interfaces in low-carbon housing , 2013 .

[38]  Kirsten Gram-Hanssen,et al.  Efficient technologies or user behaviour, which is the more important when reducing households’ energy consumption? , 2013 .

[39]  Tetsu Kubota,et al.  A Field Survey of Window-Opening Behavior and Thermal Conditions in Apartments of Surabaya, Indonesia , 2014 .

[40]  K. Ebi,et al.  Heatwave Early Warning Systems and Adaptation Advice to Reduce Human Health Consequences of Heatwaves , 2011, International journal of environmental research and public health.

[41]  Craig Brown,et al.  Understanding the role of inhabitants in innovative mechanical ventilation strategies , 2015 .

[42]  Zaid Chalabi,et al.  The impact of occupancy patterns, occupant-controlled ventilation and shading on indoor overheating risk in domestic environments , 2014 .