<p>In the research project Iot.H2O, which is funded under the Water JPI Joint Call 2017 IC4WATER, the potential of the Internet of Things concept is investigated for monitoring and controlling water distribution systems. Smart sensors are used which send data among others via LoraWAN to gateways which are connected to the Internet. The aim of the project is to use low-cost sensors and open-source software.</p><p>In the presentation, results of a range test with the developed LoraWAN devices are reported. One important factor is the antenna design. Results of tests with 6 different antennas will be presented among them are two antennas which are printed on a PCB and 4 commercially available antennas.</p><p>The TTN mapper App is used for recording the signals of the IoT devices in an urban and an rural environment.</p>
Conventional vane designs come with the disadvantage of flow detachment for high reflection. For axial machines, often tandem vanes are prevalent which combines two vanes for redirection of the flow and thus effectively prevents from detachment. However, their application for radial machines has hardly been investigated so far. This study investigates the influence of tandem vanes on the performance in terms of head and efficiency of a centrifugal pump. First, different tandem designs were numerically investigated based on Computational Fluid Dynamics (CFD). For a selected tandem variant, the numerical results were validated by experimental investigations. The preceding numerical investigations were done stationary by using a single passage model to compare the performance of different tandem impellers with a conventional impeller (unsplit vane). Therefore, a method was developed to design tandem vanes from given undivided vanes. In this way, the influence of the offset in circumferential direction and the angle of attack of the rear blade profile were systematically investigated. Transient CFD simulations have been one for a complete single-stage volute pump. In the experiments the performance curves for both the conventional and tandem impeller were determined. The results of this study show that tandem blades can increase the pressure rise of a centrifugal pump while maintaining almost the same efficiency if a suitable combination of blade angle and offset in circumferential direction of the rear blade has been selected. Furthermore, the CFD results show that the detachment can be prevented inside the impeller passage.
In the project IoT for Supervision and Control of Water Systems (IoT.H2O) the potential of the Internet of Things concept for operating pump systems is investigated. As a result of the project, a pump test rig which can be controlled by an open source IoT platform was developed. Because of COVID 19 students are currently not able to access the test rig in their laboratory class. In the paper, a virtual pump test rig is presented. The model of the test rig is based on the physical IoT pump test rig and consists of models for pump, control valve, piping system and electric motor. By modeling the electric motor, the operating behavior of the pump becomes much more realistic since effects of inertia can be included. The communication of the IoT platform with the model is based on the MQTT protocol and is identical to the real rig. The test rig can be operated with any web browser through a dashboard. On the dashboard, the operating frequency of the electric motor, the control valve position, the static head of the system and the tank pressure before the pump can be set with predefined control widgets which are already available in the IoT platform. Also, through buttons, measurements of speed, static pressure and torque are possible. The data can be downloaded after the measurements are taken. In different assignments, the students, can measure the head and efficiency curves and system curves and compare speed control and throttle control. Also, different types of pumps can be assessed easily by exchanging the pump curves in the model. A big advantage of the virtual lab tests is that the students can run the tests by themselves and obtain their own data. Before, the tests were only run in groups because of time constraints. Based on the laboratory class, they are able to assess the behavior of pumps in systems and to design pump systems efficiently. Also, they are introduced to the concept of IoT.
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