HVAC | NOISE AND VIBRATION CONTROL Introducing noise and vibration control retrospectively is more difficult and expensive than incorporating it in the initial design residential and commercial developments are becoming ever more complex. Catering to the various needs of the end user requires careful acoustic planning in the early stages, to ensure optimal sound quality and minimal disturbances between distinct functions and building services.The increased focus on health and wellbeing in buildings is another reason noise and vibration should be considered at an early stage, alongside other environmental factors such as indoor air quality and temperature control. A good acoustic strategy will contribute to a better quality of life for the end users. Acoustic consultancy is a unique, yet vital, part of the design process. Understanding how building materials and services equipment interact with each other and the surrounding environment is vital to the successful and sustainable functioning of the building. Early engagement with noise and vibration strategies using CIBSEs B4 Guide will create better holistic building designs. CJ KYRIAKOS PAPANAGIOTOU is founder and director of KP Acoustics Group, and ADAM FOX is director at Mason UK CIBSE Guide B4 is available on the Knowledge Portal www.cibse.org/knowledge References: 1 Noise complaint research, Churchill Insurance, 2022 bit.ly/3Qoh1Em absorption Figure 4.3 from the B4 guide shows typical noise transmission paths and treatment methods Isolators reduce noise and vibration if correctly selected THE CONSEQUENCES OF NEGLECTING ACOUSTICS The neglect of acoustic considerations in building design can have severe consequences for building occupants. In one recent project, an appointed MEP contractor failed to recognise the need for any acoustic components within a buildings plantroom. It is unclear whether the contractor chose to omit acoustic measures despite the existence of an acoustic report, or whether a report was done at all because of a disregard or lack of knowledge of the indispensable CIBSE Guide B4. Adding to the complexity, the heat pump supplier provided no guidance or ongoing support regarding potential noise and vibration, making the issue more difficult to rectify. The setting now finds itself unable to fully use vital spaces due to excessive noise and vibration. The quest to accommodate anti-vibration (AV) components, and the additional costs associated with retrofitting the heat pumps, only exacerbate the problem. If AV mounts are not designed in at the start, then often the equipment is simply sitting on the floor or bolted straight to ceilings or walls. The project serves as a reminder of the issues that can result from not addressing acoustics in design. It spotlights the importance of educating peers on bestpractice acoustic considerations and solutions to build a holistic approach to building design. Flexible and Efficient Nozzle Diffusers Stable and defined air distribution through set nozzle patterns Maximum induction, utilising the Coanda effect Quick mixture enabling adaptation to changing room conditions Adaptable and renovation-friendly via nozzle adjustment To learn more, visit www.swegon.com/uk/nozzles 48 November 2023 www.cibsejournal.com Expansion joints allow movement and reduce risk of pipes resonating, leading to noise and future failure