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Domestic heating with compact combination hybrids (gas boiler and heat pump): A simple English stock model of different heating system scenarios

Bennett, G; Watson, S; Wilson, G; Oreszczyn, T; (2021) Domestic heating with compact combination hybrids (gas boiler and heat pump): A simple English stock model of different heating system scenarios. Building Services Engineering Research and Technology 10.1177/01436244211040449. (In press). Green open access

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Abstract

The heat decarbonisation challenge remains substantial, competing low carbon solutions such as hydrogen and heat pumps (HPs) and the entrenched position of gas combination boilers create inertia in many markets. Hybrid appliances which can directly replace gas boilers may provide a low disruption, low-cost pathway to net zero in gas-reliant markets. Emerging compact combination (CoCo) hybrid heating appliances which combine a gas combi boiler and a small HP unit in one appliance have been modelled for the English housing stock across a range of different scenarios. CoCo hybrids offer sizeable energy demand reduction of up to 60% compared to current gas boilers, also reducing peak electrical demand by 10 GW compared to air source heat pumps. The control strategy for switching between HP and gas boiler is key in determining the scale of demand reduction. Modelling sensitivity to the HP size within CoCo hybrids showed that a 50% reduction in energy demand compared to gas boilers could be achieved with a standard 2.5 kW HP. A lack of clarity in regulation and policy incentives for hybrids exists. To drive innovation and performance improvement, product regulation for hybrids needs to be improved to support decarbonisation of heat with this promising technology.

Type: Article
Title: Domestic heating with compact combination hybrids (gas boiler and heat pump): A simple English stock model of different heating system scenarios
Open access status: An open access version is available from UCL Discovery
DOI: 10.1177/01436244211040449
Publisher version: http://dx.doi.org/10.1177/01436244211040449
Language: English
Additional information: https://creativecommons.org/licenses/by/4.0/This article is distributed under the terms of the Creative Commons Attribution 4.0 License (https://creativecommons.org/licenses/by/4.0/) which permits any use, reproduction and distribution of the work without further permission provided the original work is attributed as specified on the SAGE and Open Access page (https://us.sagepub.com/en-us/nam/open-access-at-sage).
Keywords: Low-carbon heating, stock modelling, heat pump, boiler, hybrid, heat decarbonisation
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of the Built Environment
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of the Built Environment > Bartlett School Env, Energy and Resources
URI: https://discovery.ucl.ac.uk/id/eprint/10134035
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