Leeds Beckett University - City Campus,
Woodhouse Lane,
LS1 3HE
Jonny Stokeld
Research Assistant
Jonny's work covers building performance evaluation, building energy modelling, and householder behaviour. He has a background in community energy advice and supporting households with home retrofit, as well as six years of experience in net zero consultancy.
0009-0003-7021-2076
About
Jonny's work covers building performance evaluation, building energy modelling, and householder behaviour. He has a background in community energy advice and supporting households with home retrofit, as well as six years of experience in net zero consultancy.
Jonny's work covers building performance evaluation, building energy modelling, and householder behaviour. He has a background in community energy advice and supporting households with home retrofit, as well as six years of experience in net zero consultancy.
Degrees
MSci
University of Cambridge, United Kingdom
Research interests
Jonny's research interests include building performance testing, building energy modelling and energy performance assessment. He is also interested in household behaviour and good practice for retrofit in a variety of contexts.
Publications (3)
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Measuring the IAQ impact of sustainable heating upgrades in council-run independent living flats
12 November 2025
UKHSA Annual Outdoor and Indoor Air Pollution Stakeholder event Newcastle
27 October 2025
International Retrofit Conference Innovative Approaches to Retrofit: Proceedings of the International Retrofit Conference (IRC 2025) University of Salford Salford, UK University of Salford
Whole house heat loss or heat transfer coefficient (HTC) measurements are rarely undertaken to validate the performance of retrofits installed in homes. This means policy, certification and householders must rely on predictions made by energy models. Multiple domestic energy models exist, with varying underlying rules and input requirements. This means predictions made by different models may not always agree. However, few studies have compared the predictions from these models with each other, and with measured whole house heat losses for a home before and after a retrofit. This paper compares the HTC of a three bed, semi-detached, solid-walled home measured via the coheating test, with the HTCs predicted by the Reduced Data Standard Assessment Procedure (RdSAP), Building Research Establishment Domestic Energy Model (BREDEM), Dynamic Simulation Modelling (DSM) and the Passive House Planning Package (PHPP). The results show that most predicted HTCs from the models are not similar to the measured HTC, and there is a large variation between the different modelled HTCs. The paper explores why these differences occur and reflects on how to improve the accuracy and consistency of domestic energy models.
Deterioration of retrofit insulation performance
07 January 2025
Publisher
Fletcher M, Thomas F, Miles-Shenton D, Stokeld J, Hardy A, Morland K, Fylan F, Parker J, Johnston D, Glew DThermal performance is often assumed to be constant over the service life of insulation. The aim of this project was to establish the existing evidence on the impact of retrofit degradation over time, and what it means for insulation performance. This report summarises current understanding, classifying key mechanisms for degradation and makes recommendations for how to address identified knowledge gaps.
