The Clapham Park scheme consolidates and improves existing, fragmented heat networks into a single, decarbonised district heating system. A large air source heat pump (ASHP) array will supply this new network with a total heating capacity of approximately 4 MW. The system provides low-carbon heating to around 570 retrofitted existing homes. In addition to the initial phase, the network is designed for future expansion, with plans to extend services to a further 3,300 new-build homes and over 15 commercial buildings as part of the broader regeneration of the Clapham Park area.

To support this project, JGC collaborated closely with Element Designs to model the performance of the air source heat pump array under various layout configurations. Through CFD modelling, JGC simulated airflow patterns, predicted temperature distributions, and assessed the potential risks of recirculating heated exhaust air back into the system’s intakes. This kind of recirculation can significantly reduce heat pump efficiency and system performance if not adequately mitigated.

Based on the modelling results, JGC recommended specific mitigation measures to minimise the likelihood of recirculation and optimise the heat pump array's thermal and acoustic impact on the surrounding environment. These measures included adjustments to the heat pumps' spatial arrangement, changes to the orientation and height of discharge vents, and the incorporation of suitable acoustic barriers and screening elements where necessary.