The engineers at HPI Himmen work across the board with AutoCAD and liNear Software, which offers analysis tools for heating, ventilation and sanitary facilities. With standard-compliant symbol libraries, scheme generation and 2D as well as 3D design modules they can create circuit and wiring diagrams, floor plans, sections, details and ready-to-order material lists in a very short time. In the ventilation unit, for example, we work on the design based on a 1-line representation, which already provides us with a detailed calculation of the diameter, pressure loss and noise assessment of the installation”, explains Drolshagen. “From this, we can generate our bill of materials (BOM). As part of the implementation planning, the liNear solution automatically creates the air duct system as a 3D model based on the calculated dimensions. Possible collisions are detected at an early stage and can thus be avoided.” The obtainment of basic data and technical calculations for HPI Himmen, just like the detail and implementation planning, are run from AutoCAD, Revit, liNear Building and Analyse.
For all projects, the engineering team receives the floor plans as a specification from the architect – partly in 3D, more often than not in 2D. Regardless of that, it is easier for HVAC designers to imagine fixtures such as ducts or piping systems three-dimensionally, since all air ducts, sewage, heating, cooling pipes, and electric routes must reside in one model. Ever since the engineers at HPI Himmen have worked with liNear and Revit, they have created 3D plans from 2D plans given by architects, which they can use for further designing. According to Drolshagen, this workflow offers a distinct advantage: “With the three-dimensional model, we have a very good overview to tell which ducts and pipes go where and whether they’re in the way of each other. We use clash detection for this. As soon as everything has been entered into the program and two lines cross each other, an error message will appear. This is a very helpful tool for us.”
The use of Revit not only provides HPI Himmen with a better overview of the project, but also facilitates the cooperation and coordination with other trades. Using the integrated worksharing feature from Revit, various project participants have the opportunity to use the same parametric building modeling environment and save all data in a central file. This way, project collaboration between different trades is optimised and clash detections between architectural, structural and technical elements can be carried out more easily. The engineers at HPI Himmen can also user Revit to help detect and resolve collisions early on, without having to perform tedious correction loops and adjustments, resulting in greater time and cost savings.