Abstract
This study designed a new type of intelligent thermostatic mixing valve which could keep the temperature and flux of the outlet water constant by the adaptive controller. It firstly established mathematical model of the valve about angle-flux and angle-temperature and then it applied the Fluent software to numerical simulation of the valve about flow field based on the two-equation turbulence model. Finally, it designed the intelligent controller hardware and developed the controlling software of the valve. With the controller and it finished experiments with the thermostatic valve prototype. The results of simulation and experiments prove that the correctness of the theoretical research and they can be used to improve designing of the thermostatic valve.
Highlights
Thermostatic mixing valve is designed for supporting products of the hot water system, which are widely used in electric water heater, solar water heater and geothermal heating water system
The thermostatic valve with thermal sensor is a kind of mechanical thermostatic valve in essence; the thermal sensor can be divided into two kinds: memory of titanium alloy and thermal paraffin
The control accuracy and response speed of this kind thermostatic valve depends on expansion performance of the thermal sensor
Summary
Thermostatic mixing valve is designed for supporting products of the hot water system, which are widely used in electric water heater, solar water heater and geothermal heating water system. Users can adjust the temperature of the outlet warm water according to their need and the controller can make the temperature quickly achieve the preset value and keep stably, which ensures the temperature of the outlet warm water constantly and it is not affected by the temperature, pressure and flux In this study, it firstly establishes the mathematical model of the thermostatic valve and comprehensive analysis on the characteristics of the thermostatic valve by the numerical simulation and experimental research. In order to validate the correctness of the theoretical temperature model, analyze the relationships between the pressure, temperature, flux of the inlet cool and hot water with the outlet warm water, it applies the “Fluent” software to numerical simulation about the flow field of the thermostatic valve.
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