  Energy efficient buildings require high quality standards for all their
technical equipment to enable their efficient and successful operation and
management. Building simulations enable engineers to design integrated HVAC
systems with complex building automation systems to control all their technical
functions. Numerous studies show that especially these supposedly innovative
buildings often do not reach their energy efficiency targets when in operation.
Key reasons for the suboptimal performance are imprecise functional
descriptions and a lack of commissioning and monitoring of the technical
systems that leave suboptimal operation undetected. In the research project
"Energy Navigator" we create a web-based platform that enables engineers to
create a comprehensive and precise functional description for the buildings
services. The system reuses this functional description - written in an
appropriate domain specific language - to control the building operation, to
signal malfunctions or faults, and in particular to measure energy efficiency
over time. The innovative approach of the platform is the combination of design
and control within one artifact linking the phases of design and operation and
improving the cost effectiveness for both services. The paper will describe the
concept of the platform, the technical innovation and first application
examples of the research project.
