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Contractors’ Corner
‘Digital twins’ of buildings
speed-up HVAC project design BREng, a low carbon HVAC specialist, is pioneering the use of three- dimensional ‘digital twins’ of buildings in HVAC design projects.
T
otal building digitalisation overcomes the need to source original architect
drawings, which may be outdated due to internal changes, and does not rely on conventional manual site measuring systems, which can be time-consuming and inaccurate due to human error. It uses a smart three-dimensional optical scanning system linked to laser-based lidar cameras placed at strategic points within and outside a building. This builds a detailed digital twin of the building by ‘stitching together’ successive scans, including individual spaces within fl oors and any existing HVAC services. The high-resolution fi le produced is imported into standard HVAC
design and BIM applications to design a complete building services solution, ensuring all dimensions are accurate and equipment and pipe lengths sized accurately fi rst time. In addition to their use in HVAC
project design, the 3D renders can be used to create virtual ‘walk-throughs’ of buildings, with the ability to accurately measure dimensions. Any building can be scanned, whether back-to-brick or fully fi tted out. Buildings do not have to be empty – the process can be carried out on operating buildings, with an automatic face-blur function ensuring occupant privacy. BREng reports a 75% reduction in site visits required by project stakeholders, and a 70% reduction
in survey costs and BIM fi le creation. In addition, three-quarters of project issues can be resolved without escalation.
With the need to improve building
effi ciency, BIM is increasingly being used across construction planning, particularly on HVAC services
for large public and commercial buildings. As well as saving time and cost, digital scans can be used as records of pre-existing building condition before commencement of work on refurbishment projects, enabling any damage caused during work to be fairly apportioned.
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