Nutrient solution temperature control system based on thermoelectric refrigeration technology and method

Abstract

The invention discloses a nutrient solution temperature control system based on thermoelectric refrigeration technology and a method. The system comprises a main control model, a temperature detection module, a water pump module and a sensing module, wherein the temperature detection module detects temperature values of the indoor, a cultivation trough and a nutrient solution box; a sensing module is used for sensing water flow passing between a semiconductor temperature control device and the cultivation trough; and according to the temperature values and the sensing value, the main control module controls the water pump module and a solenoid valve to execute a related command. Corrosion prevention can be effectively realized, the environment is not polluted and the use is convenient; purposes of temperature reduction and heating can be realized and temperature control systems of different specifications can be designed according to different requirements; and energy can be saved, and nutrient solution temperature control can be realized high efficiently.

Description

technical field [0001] The invention relates to the field of temperature control, in particular to a nutrient solution temperature control system and method based on thermoelectric refrigeration technology. Background technique [0002] Plant rhizosphere temperature has a significant impact on its water metabolism, mineral absorption, plant hormone metabolism, growth and development, photosynthesis, etc. The root system is most sensitive to the stress of high temperature stress, especially the absorbing root. According to Adams et al., in the soilless cultivation of tomato nutrient liquid film, when the rhizosphere temperature is kept in the range of 12-24 °C, the dry weight of the plant, the leaf area and the fruit yield increase with the increase of the nutrient solution temperature. At present, the temperature of the nutrient solution is mainly controlled by groundwater, adding ice, heating by electric heating tubes, and increasing the volume of the nutrient solution tank...

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Problems solved by technology

[0003] In summer, although using groundwater to cool down can effectively control the temperature of the nutrient solution, it is a serious waste of groundwater and is restricted by geographical and environmental factors; it is not easy to control the temperature of the nutrient solution by adding ice, and it is easy to cause damage to the surrounding environment. Pollution

In winter, although heating with electric heating tubes can meet the requirements of plant growth, after a period of heating, Cat+ and Mgt+ ions will scale on the surface of the heating rod, which will inevitably cause changes in the composition of the nutrient solution.

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