Medical Construction & Design (MCD) is the industry's leading source for news and information and reaches all disciplines involved in the healthcare construction and design process.
Issue link: http://mcdmag.epubxp.com/i/757413
22 Medical Construction & Design | NOV EMBER / DECEMBER 2016 | MCDM AG.COM Three-dimensional building informa- tion modeling is revolutionizing the way medical facilities are planning and manag- ing their projects. It has made a specifi c impact on heating, ventilation and air con- ditioning work, a component of healthcare projects that aff ects every other design and construction aspect. Healthcare projects often involve a large amount of services installed within a limited amount of ceiling space. HVAC work (including ductwork, piping, ter- minal units, etc.) takes up the majority of ceiling space, but space must also be allowed for other services such as medi- cal gas, domestic water, sanitary and vent, power, lighting, fi re protection devices and more — all of which have clearance and maintenance accessibility requirements. More often than not, the design team spends a signifi cant amount of time during the design phase, coordinating HVAC ser- vices and utilizing 3-D modeling tools, such as REVIT. Unfortunately, this information is usually not translated to the construction team, as two-dimensional drawings are still used for bidding and installation. 3-D BIM can help ensure proper com- munication between all involved parties. Using intelligent BIM technology enhanc- es planning by giving a detailed look at how services are installed and constructed, which saves companies time and money by allowing them to proactively solve poten- tial problems. Design and coordination can also be done in real time between consul- tants through the use of a dedicated server. Benefi ts beyond the project BIM gives the entire project team the ability to create an accurate model that can be used throughout the lifecycle of the building. While it can be arduous to input massive amounts of data into the model during the initial HVAC design phase, the payouts are substantial. For example, BIM allows for real-time monitoring of a build- ing's temperature, ventilation, air quality, humidity and equipment lifecycle infor- mation, which is valuable to any individual involved in the operation of the facility. BIM also allows for prediction-based HVAC design. BIM HVAC models are parametric, meaning they automatically update related objects when one model property changes. For example, supply and exhaust airfl ow values for terminal units can sum their connected airfl ows and au- tomatically update schedule information to match the design. These digital predic- tions lessen project costs associated with work completed when contractors have had to troubleshoot in the fi eld. Most 3-D BIM programs provide for various architectural, MEP and structural models to be linked through a server. This allows each consultant to collaborate and react to changes made by other designers in real time through a single, linked model. Additional tools are also available to detect problems between modeled elements dur- ing design. By having the ability to model service clearances, coordinate with the build- ing architect and eliminate confl icts, the design team can create a better set of contract documents for the construction team. This is especially crucial for HVAC projects given the amount of services pres- ent above ceiling. Making the move from 2-D to 3-D Unfortunately, construction documents are typically still in 2-D. This means that if the design team creates a fully coordinated 3-D model, contractors may have a hard time translating it and must coordinate between trades as part of the construc- tion phase of the project. This is typically done through the creation of coordination drawings. To ensure that various contractors are obligated to utilize the information created by the BIM model, coordination drawings should be a project requirement of the gen- eral contractor. They should also require the use of 3-D software to allow a contrac- tor to take advantage of the coordination work done by the design team. 3-D BIM increases project effi ciency by allowing the HVAC, electrical and plumbing teams to develop their own digital models and integrate them into the fi nal, cohesive 3-D model. 3-D BIM allows each team to access the coordinated model simultaneously and make adjustments where necessary. The 3-D coordination drawings, once completed, can then be turned into instal- lation drawings utilized by the individual installers for each trade. Although some fi eld coordination may still be required Healthcare HVAC Spotlight BY GREG HUDSON Benefi ts of using 3-D modeling, coordination drawings on HVAC projects Enhanced Flow Completed hybrid operating room with robotic C-arm and operating table. o n n of of t t he he he f ac ac ac il il il it it it y. y y. w in in t t in in m t 3-D BIM view of addition showing mechanical services.