The requirements for energy efficiency in buildings are constantly increasing.
A substantial part of the demanded energy savings is achieved with the help of universal room automation and the adaptation of the primary systems to suit the local requirements. Beckhoff’s integral approach in building automation planning, using the TwinCAT software library for heating, ventilation and air conditioning (HVAC) and the Bus Terminal I/O system, enables maximum energy efficiency with low system costs and a rapid return on investment.
New software function blocks for improved interoperability of individual systems
In order to achieve the required interoperability, Beckhoff has extended the TwinCAT HVAC library for the control of heating, ventilation and air conditioning systems by implementing functions from the field of room automation. Using coordinated PLC function blocks it is possible to combine the functions for shading, lighting, ventilation, heating and cooling with one another in relation to time and presence. The following new core functions are available for energy-efficient room automation:
– Lighting: light circuit, automatic light, daylight circuit, constant light control, twilight circuit
– Sun protection: weather protection, sun protection with or without louvre adjustment, thermo-automatic function, automatic twilight function, shading correction
– Room climate: energy level selection with or without start optimization, setpoint value determination, function selection (control function), air quality control, room temperature control, load optimization
Time and presence-dependent control saves energy and costs
With integrated room automation, a building can be controlled time-dependently in different modes of operation, in order to save both heating and cooling energy during longer periods of vacancy. Nevertheless, the system must quickly reach the comfort temperature and also a good air quality at peak times. With the aid of occupancy sensors the individual systems can be used in different areas of the building for different functions. For instance, the sun shading serves on the one hand to protect people against glare, while on the other it can also be used to reduce the input of heat from the outside when the room is unoccupied. In winter the shading can be used to save heating energy in the case of vacancy, for example, by not darkening rooms on the south side.
The lighting is directly connected with the facade using the library. Only an effective interconnection helps save lighting energy, to use as much daylight as possible without glare and to guarantee a constant lighting intensity. For the efficient control of a facade it is also necessary to know which objects in its environment have an effect on it. Objects that cast shadows on part of a building are taken into account in the TwinCAT HVAC library. Beyond that the ventilation system or, if installed, motor-driven windows can be integrated for effective cooling on summer nights, for example.
The TwinCAT HVAC library guarantees a large range of system functions and exceptional reusability of building automation templates once created and contributes to the simplification of engineering efforts, improves energy conservation and curtails costs.
The TwinCAT HVAC library for the control of heating, ventilation and air conditioning systems has been extended with functions from the field of room automation. The software modules for shading, lighting, ventilation, heating and cooling can be combined in relation to time and presence.