Study of the Influence of Phase Transition Tubes Microclimate on the Heat of Arched Greenhouses

Crop yields in arched greenhouses are affected by solar energy and ambient temperature. These factors affect the temperature and heat exchange inside the greenhouse. To maintain optimum air temperature inside the greenhouse, special matrix tubes installed at different depths of the soil are used to transfer the temperature of the lower soil layers to the upper layers, thus balancing the air temperature inside the greenhouse. The study focused on the addition of phase transition materials to thermal energy accumulators. We conducted an experiment for ten days in a greenhouse with matrix tubes inside. To monitor the results, the soil was divided into 6 sections with depths of 10, 30 and 50 cm, and the height of the center of the greenhouse was 0, 30, 60, 90, 120, 150 and 180 cm. The experimental results confirm that the heat exchange device can actively regulate the thermal environment in the greenhouse. The results show that the deeper the soil, the smaller the temperature fluctuations in the soil and the more efficient the energy storage with phase transition materials. The findings indicate that heat exchangers using working fluids that can effectively improve soil temperature stability and play a role in regulating indoor air temperature through “peak shifting and valley filling”.

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