Modern Building Services

32 MODERN BUILDING SERVICES SEPTEMBER 2021 FEATURE BIM N ot so long ago the task of putting together an accurate and workable specification for a building project would have been a long and challenging one for architects and designers. Issues arising from the complexity of the build would only become apparent once work was under way, leading to unexpected costs and over running contracts. Thanks to digitalisation and the relatively recent introduction of Building InformationModelling (BIM), a lot of those potential problems can be recognised in advance and the consequences avoided. It has also had a positive impact on project management and construction, helping make these operations more efficient, achieving significant savings over the project term along with lasting benefits. Using BIM enables those involved in the specification process, from architects to surveyors, building services engineers to MEP contractors, to work to a shared virtual model, one that provides all the parties with a detailed picture of how each plumbing fitting or other unit fits into the overall system or building design, shows how these components interact with each other and if any changes are needed as a result. The BIM process is widely acknowledged as a more effective way of working than the ‘old- fashioned’ drawing board method, where design teams worked independent of each other on a series of multi-stage drawings. Accessible technical data For HVAC professionals, using BIM makes the sourcing of technical data much more accessible, whether this is technical information on individual fittings, pipework runs or where mechanical equipment should be located. This gives those carrying out installations a better and more detailed overview to work towards, like if the system will be impacted by other services, or if the building’s layout or structure has an impact on the design. Similarly, using BIM also shows if the HVAC installation itself has consequences for other systems and structures within the building. Should any ‘clashes’ be apparent, it creates the opportunity to seek an appropriate solution at an early stage and avoid having to address a problem on-site which could lead to inevitable delays, unwanted labour and other associated costs. The development of a large residential apartment block, for example, potentially served by a district heating system, will require extensive runs of copper pipework. BIMmodelling enables the specifier tomore accurately predict the length of the required piping for the project, along with producing a schedule for the type and number of fittings required to compete the installation. The system designer is also able to make sure the entry points into each room are in the right place and that there are no conflicting elements. Another example is rainwater harvesting, which is increasingly popular with new commercial buildings as it helps meet environmental targets. Through BIM it’s easy to see that it is not compromised by the property’s other drainage systems. With the built environment becoming ever more complex, choosing the right products and materials can seem like an unfathomable maze. Daniel Smith , BIMManager for Conex Bänninger, discusses the growing importance of Business Information Modelling and howmanufacturers can help smooth theMEP design path for specifiers. How BIM can lead you through the specification maze