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Title: Energy-led retrofitting of solid wall dwellings: technical and user perspectives on airtightness
Authors: Banfill, Phil
Simpson, Sophie
Haines, Victoria
Mallaband, Becky
Keywords: Airtightness
Energy consumption
Heating and ventilation services
Householders attitudes
Mechanical ventilation
Issue Date: 2012
Publisher: © Emerald Group Publishing Limited
Citation: BANFILL, P. ... et al., 2012. Energy-led retrofitting of solid wall dwellings: technical and user perspectives on airtightness. Structural Survey, 30 (3), pp. 267 - 279.
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 5?m3/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.
Description: This article was published in the journal, Structural Survey [© Emerald Group Publishing Limited] and the definitive version is available at: http://dx.doi.org/10.1108/02630801211241829
Sponsor: This work forms part of the CALEBRE Project which is funded by the Research Council's UK Energy Programme and E.ON, to whom the authors express their gratitude. The authors also thank the participants, without whom this study would not have been possible.
Version: Accepted for publication
DOI: 10.1108/02630801211241829
URI: https://dspace.lboro.ac.uk/2134/11836
Publisher Link: http://dx.doi.org/10.1108/02630801211241829
ISSN: 0263-080X
Appears in Collections:Published Articles (Design School)

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