The term “smart home” refers to the networking of various devices in the household for (automatic) central control. The devices or sensors and actuators can be connected by using wired technology and wireless technology with a central controller, which provides a user interface by display, an application on the tablet / smartphone or other devices.
Above all, bulbs, switchable sockets and home appliances such as washing machines or refrigerators are popular smart home devices. Energy meters or safety systems can also be networked with the smart home controller. In addition, the (living) room air conditioning by a variety of smart home components is possible, too.

In the GreenEnergyFirst project, three different devices are installed in each of the three rooms of the participating residential units

 

Source: own photo by EBZ
1. Temperature and humidity sensor: For control functions and monitoring the room temperature and the relative humidity of the room air in the respective room are recorded by the sensor.
Source: own photo by EBZ
2. Window contact An open window is detected by the sensor. This isn’t only important for the monitoring it’s also pertinent for the control of the thermostatic head in order to avoid unnecessary heating when the windows are open

 

Source: own photo by EBZ
3. Thermostatic head: The existing analogue thermostatic head on the radiator of the respective room is replaced by the smart thermostatic head, which contains an electronically controlled actuator. The room temperature is regulated according to a defined program. A manual setting of the desired room temperature on the thermostatic head still remains possible as usual.

 

The devices installed in the residential units are connected via radio technology with receivers, which are mounted near the residential units. These receivers, as well as the electricity meters of the residential units wired to a central control. Furthermore, the energy producers installed in the property (CHP plant and PV system with battery storage) and the charging station for electric vehicles are also connected to the central control. The heat meters of the buildings are connected to the central control, too. The central controller is connected to a host computer, which provides a user interface and saves all data collected by the building services for evaluation in a database.
The aim of the components installed in the apartments is to regulate the use of heat energy as efficiently as possible.
For this purpose, the users of the participating residential units have got the opportunity to create a scedule and desired room temperatures for the respective rooms of their apartments via an application on the Smartphone/Tablet under the guidance of project personnel. For users, the application provided by the host computer.