Tobias Maile

Transforming BIM to BEM: Generation of Building Geometry for the NASA Ames Sustainability Base BIM

LBNL-XXXX Transforming BIM to BEM: Generation of Building Geometry for the NASA Ames Sustainability Base BIM James T. O’Donnell, Tobias Maile, Cody Rose, Natasa Mrazovic, Elmer Morrissey, Cynthia Regnier, Kristen Parrish and Vladimir Bazjanac January 2013

BIM for Energy Analysis

This chapter addresses BIM in the context of energy demand calculation and building performance simulation. The focus is on different methods to identify the energy demand as well as on building services engineering, including references to the respective standards and calculation bases. We will present data exchange formats that can be used to exchange and to model the energy-related specifications of buildings and its systems and installations – and we will discuss the necessary requirements and definitions regarding the aspects of geometry, zoning, as well as semantics. The chapter also briefly discusses the current state of software-support for HVAC engineering calculations and dimensioning. Furthermore, we focus on the process chain for the use of BIM in the scope of energy demand calculation and simulation, including a brief discussion of the corresponding Model View Definitions of the Industry Foundation Classes. The chapter closes with an outlook on current research and development projects.

BIM für die Energiebedarfsermittlung und Gebäudesimulation

Das Kapitel setzt BIM in den Kontext der Energiebedarfsermittlung und der Gebaudesimulation. Es werden zunachst die verschiedenen Methoden der Energiebedarfsermittlung und TGA Fachplanung vorgestellt und Bezug auf die entsprechenden normativen Vorschriften und Berechnungsgrundlagen genommen. Es werden Datenaustauschformate vorgestellt, die zum Austausch und zur Modellierung von energierelevanten Gebaude- und Anlagendaten zur Verfugung stehen, wobei auch auf notwendige Anforderungen und Definitionen aus Sicht der Geometrie, Zonierung und Semantik eingegangen wird. Das Kapitel diskutiert kurz den Stand der softwareseitigen Unterstutzung hinsichtlich ingenieurtechnischer Berechnung und Dimensionierung. Weiterhin wird die fur den BIM-Einsatz in der Energiebedarfsermittlung und Simulation notwendige Prozesskette vorgestellt und kurz auf entsprechende Model-View-Definitionen der Industry Foundation Classes eingegangen. Ein Ausblick auf laufende Forschungs- und Entwicklungsarbeiten rundet das Kapitel ab.

Streamlining the Value Engineering Process and its Impact on Building Energy Performance

Value Engineering (VE), as used in building design and construction projects, aims to identify opportunities to reduce construction cost, optimize the performance of the future building, reduce future operating expenses and cost, shorten building delivery time, and possibly avoid (future) legal problems and litigation. In its current practice VE action typically focuses on issues for which quantitative data are on hand (i.e. reduction of construction cost based on cost estimates), while leaving to speculation the assessment of the impact of a given construction cost reduction on the future building’s performance. Most new building designs include features and measures to minimize energy consumption but, once in use, such buildings often fail to meet their energy performance expectations. Analyses of design histories usually show that the planned and designed energy efficiency features and measures were eliminated due to blunt cost cutting in VE events. This paper describes Performance Based Value Engineering (PBVE), which can mitigate problems encountered in standard VE events. It employs semi-automatic generation of input for simulation of building energy performance, which enables quick delivery of predicted energy performance and operating cost to provide a quantitative counter argument to blunt cost cutting.