# An Optimizing Heat Consumption System Based on BMS
## 5 Implementation and Discussions  
This paper presents the general architecture of a BMS system for energy consumption management within a university campus. In this section, we will present and discuss some of the basic elements regarding implementation; a future paper will present in detail the implementation method and the obtained results. The solution proposed in this paper aims to reduce the energy consumption by 13% for thermal energy and by 32% for electricity. The proposed system uses the latest technology in the field of BMS systems. The automation of the cogeneration motors will be performed with a PLC, monitored by a SCADA system, interconnected throughout with the buildings via a fieldbus. A BMS system will be used to control the temperatures in each room, which can be used in all modern buildings. The software architecture of the system is presented in Figure 5. Thus, the temperature probes and electro-valves in the students' houses are interconnected via the Modbus RTU fieldbus. In the control room at the students' house level, the BMS system is installed, which includes a driver for the MODBUS RTU. The connection to the fieldbus is made via a USB-RS485 interface. From the control room, you can view the temperatures in each room; you can also set the desired temperature in each room (for example, in unoccupied rooms, the temperature will be set to the minimum possible value to reduce unnecessary energy consumption). As can be seen from Figure 5, there may be several student houses (\"p\" in Figure 5) that are monitored, and each students' house has a varied number of rooms (\"m\" in Figure 5). All temperature control is performed at the building level via BMS. The acquisition of the values for the temperatures and the setting of the solenoid valves in each room are performed periodically, at 5 s intervals (this time period is enough because it is a slow process and this allows the monitoring of an increased number of rooms on the same fieldbus). The BMS also has a Modbus TCP/IP module, through which the SCADA system from the cogeneration group will be able to determine the energy demand for that building. The BMS system will make the necessary predictions (based on the outside temperature and the difference in each room between its temperature and the temperature that must be maintained). This requirement is used by the SCADA system to control the PLC that controls the cogeneration unit. The SCADA system will connect to the BMS and PLC systems that control the cogeneration group via the MODBUS TCP/IP fieldbus. Through the SCADA system, different parameters can be viewed through more HMI interfaces (dashboards) (\"n\" from Figure 5), as will be seen below. The BMS system developed in this case can be used simultaneously in numerous buildings. For this reason, the system is distributed between buildings, using a middleware system based on the TCP/IP stack (the buildings can be interconnected via a local network or through the public internet network). The modules in a building are connected to the BMS system via a local fieldbus (MODBUS TCP/IP). Figure 6 presents some dashboards from the system control room. From here, the cogeneration plant and the temperature from each room can be controlled and monitored. A detailed dashboard for the control and monitoring of the cogeneration plant is shown in Figure 7. The temperature from each room can be controlled at the level of each building and from the control rooms of the system. Figure 5: The software architecture of the proposed solution. Figure 8 presents the HMI interface of the PLC that monitors and controls the cogeneration plant. This PLC is connected to the SCADA system installed in the control room via a local fieldbus--the MODBUS TCP/IP. Figure 6: The dashboards for the students’ house and cogeneration plant. Figure 7: A detailed dashboard for the cogeneration plant. The proposed solution has reduced the consumption of thermal energy by 13% and the consumption of electricity by 32%.