Page - 1294 - in Book of Full Papers - Symposium Hydro Engineering

First, we get the data such as boundary temperature, temperature difference and change ratio and we can calculate the designed flow and pass the data to the local controller. Then, the controller adjusts the control valve according to PID method thus controlling the temperature of concrete. The system can automatically and timely collect the temperature data and then provide individual method for different concrete sections. It can choose proper thermal parameters for each concrete section thus exactly controlling the flow and temperature. The PID method used by local controller is composited as figure 2. In this system, the output constant r(t), the flow difference, practical integration and differential are combined as a controlled variable to adjust the temperature of concrete. Fig. 2 Control system diagram of analog PID 3. INTELLIGENT COOLING CONTROL SYSTEM The intelligent cooling control system mainly includes devices for heat exchange, the control device, and the device of monitoring. Here they are introduced respectively. The device for heat exchange: it is installed inside the concrete or on the surface, for exchanging heat with cooling pipes and achieving individual controlling of temperature of concrete section. The control device: it mainly includes an integrated control device of temperature and flow, which contains a flow meter, control valve and a thermometer. The integrated device is installed in each closed pipe loop. Under normal circumstances, the system can intelligently calculates the required flow and transmits control commands to the control device. Of course, when an abnormal situation is encountered, manual intervention can also be performed to manually control the integrated device. The device of monitoring: it includes temperature sensors installed inside the concrete and in the import and export of the cooling pipes. Besides, the system also has a computer server and a software platform for data display data query and control operations. The data acquired by the sensor is transmitted to the computer server through wired or wireless means, and the user can view it on the mobile phone or the computer at any time through the software platform. 1294