Automated water mixer
Abstract: The aim for this thesis is to explore the possibility to save both water and energy in showers. Through a quicker, more responsive and precise shower faucet using digital thermometers and stepper motors. A faucet has two input pipes with cold and hot water respectively. To reach a desired shower temperature; a single thermometer is needed, to measure the mixed water temperature. Using this information, two motors will control two valve until the desired temperature is reached. To maintain the desired temperature throughout the shower session, the temperature should be continuously monitored and when temperature disturbance occurs, the valves should compensate for it. To achieve this a demonstrator was made. The demonstrator uses stepper motors connected to valves to control the flow through a hot and cold water pipe. The system reads the temperature of the output water continuously and makes appropriate changes to the position of the valves. Due to safety concerns, no water was used in the testing of the demonstrator. The theoretical response time of the system is very short, and the demonstrator can theoretically change temperature of the mixed water by around 5°Celsius per second.
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