# PROSIM in the Cloud: Remote Automation Training Platform with Virtualized Infrastructure
## 5 Results
### Process Simulations
Heat exchangers allow end users to reduce their carbon footprint by recovering the waste heat of the generated emissions produced in industrial process. Thus, the energy cost is reduced, and the air exhausted into the ecosystem can be filtered of dangerous chemicals at an intermediary stage. The simulation frontend user interface is shown in Figure 8.  
_Functional description 1 (manual mode)_: The hot air resulting from the burning of the raw material reaches the chimney where the SP1 bypass is located. The installation is started by pressing button S1 and stopped by pressing button S0. The lamp H indicates operation. Pressing the S7 button will set the control system into Manual mode. When the system is in manual mode, the lamp H1 must be ON and the lamp H2 must be OFF. Once the system is in manual mode, the switches can be used to engage/disengage the pumps and the mixer valve. The temperature transducers can measure the temperature between \(-\)25-400 \({}^{\circ}\)C and provide an unified electric signal of 0-10 V.  
_Functional description 2 (automatic mode)_: Pressing the S3 button will set the control system into automatic mode. When the system is in this mode, the lamp H2 must be ON and the lamp H1 must be OFF. When the agent temperature (TT1) is lower than 90 \({}^{\circ}\)C then  
Figure 8: Heat exchanger simulation environment. Figure 7: UML diagram—pumping station. the PLC should close the bypass to direct the hot air towards the heat exchanger. When the agent temperature is higher than 90 \({}^{\circ}\)C, the bypass opens, and the hot air goes directly to the atmosphere. Once the bypass has been opened, the PLC should close it only when the TT1 has reached 80 \({}^{\circ}\)C. As a safety precaution the bypass is normally open. The mixer valve Y1 and the recirculation pump M1 ensure the recirculation of the agent through the heat exchanger and the buffer tank. If the temperature in the buffer tank drops below 80 \({}^{\circ}\)C (TT2) the mixer valve Y1 should commute to buffer tank and M1 should start. If the temperature reaches 85 \({}^{\circ}\)C then the mixer valve Y1 must commute to the recirculation system. As a safety precaution, when the temperature in the buffer vessel reaches 180 \({}^{\circ}\)C, the bypass must be opened, the valve Y1 must be closed and the pump M1 must be shutdown. Button S6 is used to drain water from the boiler. When the pressure of the water circuit drops below a set point then the PS1 (pressure switch) signal is enabled. The pump M2 should start in order to feed hot water into the circuit. After some time, the PS1 signal will be turned OFF and the pump M2 must be stopped. When the pump is running, the temperature in the boiler will decrease. The system is able to switch between the manual and automatic mode in order to ensure a smooth operation. In manual mode, the user can activate various equipments without considering the safety measurements. In automatic mode, the heater will rise the temperature of the agent to a set constant. When the agent is hot enough, then the temperature of the water in the boiler can be influenced. The conceptual discrete state model of this process is listed in Figure 9.  
Being able to produce, store and process a large quantity of data is essential in order to detect patterns and apply a predictive maintenance strategy. Thus, in the current state of the industrial process, it is necessary to be able to integrate different equipments. The simulation of a smart metering system (Figure 10) showcases such functionality and allows to trainee to collect and interpret data from an industrial point of view. Functional descriptionThe system consists of three measuring lines. Each line is equipped with a flowmeter capable of monitoring the flow through the pipe and sending the available data via a Modbus communication.