Energy-led retrofitting of solid wall dwellings: technical and user perspectives on airtightness

Phillip Frank Gower Banfill, Sophie Simpson, Victoria Haines, Becky Mallaband

Research output: Contribution to journalArticle

Abstract

Purpose – Mechanical ventilation with heat recovery (MVHR) is increasingly being promoted in the
UK as a means of reducing the CO2 emissions from dwellings, and installers report growing activity in
the retrofit market. However, the airtightness of a dwelling is a crucially important factor governing
the achievement of CO2 reductions, and the purpose of this paper is to understand the technical
implications of airtightness levels in an experimental dwelling, purpose built to typical 1930s
standards, at the same time as gaining the users’ perspectives on airtightness and ventilation in their
homes.
Design/methodology/approach – In-depth interviews were carried out with 20 households to
collect information on their retrofit and improvement strategies, attitudes to energy saving and their
living practices as they impinge on ventilation. The experimental house was sealed in a series
of interventions, leading to successive reductions in the air permeability as measured by a 50 Pa
pressurisation test. The behaviour of a whole-house MVHR system installed in the experimental
house, was simulated using IES Virtual Environment, using a range of air permeability values
corresponding to those achieved in the retrofit upgrading process.
Findings – In the house considered, air permeability must be reduced below 5m3/m2h for MVHR to
make an overall energy and CO2 saving. However, to achieve this required a level of disruption that, on
the basis of the views expressed, would be unlikely to be tolerated by owners of solid wall dwellings.
Originality/value – The paper is the first to combine results from a user-centred approach to
exploring the existing practices of householders with a simulation of the energy and CO2 performance
at different levels of airtightness of an experimental house in which MVHR has been installed.
Original languageEnglish
Pages (from-to)267-279
JournalStructural Survey
Volume30
Issue number3
DOIs
Publication statusPublished - 1 Jan 2012

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Retrofitting
Waste heat utilization
Air permeability
Lead
Ventilation
Virtual reality
Energy conservation
Artificial Respiration

Keywords

  • Housing
  • Heating and ventilation services
  • Energy consumption
  • Airtightness
  • Householders attitudes

Cite this

Banfill, Phillip Frank Gower ; Simpson, Sophie ; Haines, Victoria ; Mallaband, Becky. / Energy-led retrofitting of solid wall dwellings: technical and user perspectives on airtightness. In: Structural Survey. 2012 ; Vol. 30, No. 3. pp. 267-279.
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Energy-led retrofitting of solid wall dwellings: technical and user perspectives on airtightness. / Banfill, Phillip Frank Gower; Simpson, Sophie; Haines, Victoria; Mallaband, Becky.

In: Structural Survey, Vol. 30, No. 3, 01.01.2012, p. 267-279.

Research output: Contribution to journalArticle

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AU - Simpson, Sophie

AU - Haines, Victoria

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AB - Purpose – Mechanical ventilation with heat recovery (MVHR) is increasingly being promoted in theUK as a means of reducing the CO2 emissions from dwellings, and installers report growing activity inthe retrofit market. However, the airtightness of a dwelling is a crucially important factor governingthe achievement of CO2 reductions, and the purpose of this paper is to understand the technicalimplications of airtightness levels in an experimental dwelling, purpose built to typical 1930sstandards, at the same time as gaining the users’ perspectives on airtightness and ventilation in theirhomes.Design/methodology/approach – In-depth interviews were carried out with 20 households tocollect information on their retrofit and improvement strategies, attitudes to energy saving and theirliving practices as they impinge on ventilation. The experimental house was sealed in a seriesof interventions, leading to successive reductions in the air permeability as measured by a 50 Papressurisation test. The behaviour of a whole-house MVHR system installed in the experimentalhouse, was simulated using IES Virtual Environment, using a range of air permeability valuescorresponding to those achieved in the retrofit upgrading process.Findings – In the house considered, air permeability must be reduced below 5m3/m2h for MVHR tomake an overall energy and CO2 saving. However, to achieve this required a level of disruption that, onthe basis of the views expressed, would be unlikely to be tolerated by owners of solid wall dwellings.Originality/value – The paper is the first to combine results from a user-centred approach toexploring the existing practices of householders with a simulation of the energy and CO2 performanceat different levels of airtightness of an experimental house in which MVHR has been installed.

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