Thermal building simulation and system simulation
Using thermal building simulation and thermal system simulation, hourly demand for heating and cooling of the building are anticipated. Both the thermal building simulation and thermal system simulation are tools of integral planning and require intensive communication between all people involved in planning.
Both thermal building simulation and thermal system simulation tend to find out about operating and investment costs already at the stage of building planning, reduce them via appropriate optimization measures, and create a comfortable and attractive building in terms of indoor climate. Thus, design faults that, as a general rule, can only be undone involving a great deal of expenses, can be avoided already in the early planning phases via thermal building simulation and thermal system simulation. Whether it is about a competition, a schematic design, a design development or a detailed engineering - both the thermal building simulation and thermal system simulation can be applied in all planning phases.
In the competition phase e.g. the thermal building simulation to optimize the structure, in detailed engineering e.g. the thermal system simulation to optimize system control.
Compared to common planning procedures of HVAC, the thermal building simulation and thermal system simulation simultaneously consider the interaction of the system, building construction and its use. That way, e.g. changes in the facade of the building or changes in the control systems can directly be deducted as changes in costs for energy and system.
Because of the detailed and flexible structure of the models for both building simulation and system simulation, the advantages and disadvantages of innovations for buildings and systems can be shown without fundamental restrictions. Thus, with thermal system simulation, the operation of a groundwater-fed slab cooling and slab heating for building units can be compared to conventional operation using radiators and chilled ceiling, or the potential of solar cooling can be calculated using thermal system simulation.
Due to the fact that both the entire building and the vicinity development can be represented three-dimensionally in case of thermal building simulation, in contrast to simple one-room-building simulation programs, the insolation onto the facades of the building, as well as the solar ray tracing in the rooms can be determined as close to reality as possible. Taking into account building shading in the thermal building simulation can result in explicit cost cutting for cooling technology. The exact representation of solar ray tracing with thermal building simulation becomes very important, especially in calculating large glazed rooms.
The temperature- and wind-induced flows through facade joints or opened windows can be taken into consideration within thermal building simulation, as well. In case of skyscrapers, for example, the height-induced differences in heating load and cooling load, or the cooling potential of window ventilation in rooms with openable windows can be calculated and shown using thermal system simulation.
In contrast to conventional design programs, the tools used in thermal building simulation and thermal system simulation are regularly adjusted to the latest building technologies. As an example, with building simulation, today already PCM material can be assessed in terms of economy, or the control of solar cooling systems can be optimized with thermal system simulation.