Electric heat tracing optimizes temperature control in greenhouses

Uneven temperature control in greenhouse sheds can easily lead to imbalanced crop growth, with frost damage to seedlings in low-temperature areas and wilted leaves in high-temperature areas, directly affecting yield and quality. Traditional temperature control relies on hot air systems, which struggle to balance local temperatures. However, electric heat tracing, through precise temperature control optimization, can reduce the temperature difference inside the shed to ±2℃, helping to increase crop yields by 15%.

The core is to customize temperature control schemes according to the growth stages of crops. During the seedling stage, a constant temperature of 25-28℃ needs to be maintained. A 15W/m self-regulating heating cable is wrapped around the bottom of the seedling tray and paired with a thermostat for real-time adjustment to avoid seedling stunting due to low temperatures. During the flowering and fruiting stage, a temperature of 18-22℃ needs to be maintained. Heating cables are laid parallel on both sides of the planting rows at a spacing of 30cm to ensure pollination and fruit setting rates. During the bulbing stage of root crops, an impermeable heating cable can be buried 5cm below the soil to maintain a ground temperature of 15-18℃ and promote nutrient accumulation.

Scientific laying and spatial adaptation enhance temperature control accuracy. The pipes inside the greenhouse are laid using a spiral winding method with a pitch of 50cm, ensuring uniform distribution of hot air. The seedling area is densely paved with low-power heat tracing cables, with 2-3 meters per square meter. The tall greenhouse body is installed with heat tracing cables in layers at the top and bottom, with the top focusing on temperature control and the bottom focusing on heat preservation, reducing the temperature difference between the top and bottom. The heat tracing cables are fixed with special buckles to avoid direct contact with irrigation pipes and prevent moisture and short circuits.

The supporting system optimizes and strengthens the temperature control effect. It integrates electric heat tracing with temperature and humidity sensors, automatically starting when the local temperature falls below the set value and shutting off when it exceeds the threshold, while adjusting humidity in conjunction with the ventilation system. Reflective film is applied to the outside of the heat tracing belt to reflect heat to the crop canopy, reducing energy waste. In areas prone to heat dissipation such as the edges of the shed and the entrance, the density of heat tracing belt laying is increased and the insulation layer is thickened to resist external low temperature intrusion.

Daily management and maintenance cannot be overlooked. Weekly inspect the heat tracing belt sheath for any scratches from agricultural tools and promptly repair them with waterproof tape; monthly clean the surface dust and fallen leaves to ensure smooth heat dissipation; adjust the position of the heat tracing belt according to the growth height of crops to avoid burning the leaves due to excessive proximity. After harvest, conduct a comprehensive inspection of the heat tracing system, replace aging components, and prepare for the next season's production.

The key to optimizing electric heat tracing in greenhouse cultivation lies in "temperature control as needed and precise laying." By designing a scheme that adapts to the growth requirements of crops, the temperature inside the greenhouse can be balanced and stabilized, creating a suitable environment for crops. This not only reduces the occurrence of pests and diseases but also enhances yield and quality, making it a practical technology for improving the quality and efficiency of greenhouse cultivation.