Speaker
Description
The joint IOA / CIEH practitioner note refers to “appropriate sound propagation modelling carried out by an SQA”. The industry and international standard model for outdoor sound propagation modelling is ISO 9613-2, despite not being proven to be suited to modelling complex urban morphologies. Variability in how practitioners build and configure these models can lead to materially different predicted sound levels for a specific scenario. This paper outlines the modelling features that may be useful to include in modelling guidelines for ISO 9613-2 based predictions of sound from domestic air source heat pumps (ASHP), developed in the context of planning for domestic ASHPs.Guidelines are recommended for ground absorption, spectral data, reflection order, and building geometry to work towards establishing a consistent, robust framework. The advantages and constraints of point source or box sources are also discussed. Practical guidance is proposed for corner placements, partial barriers, and receiver positioning.