How to cool down the greenhouse to 25 degrees? Should it be ventilated on cloudy and rainy days?
Cooling methods include shading cooling, wet curtain fan cooling, mist cooling, natural ventilation cooling, air conditioning and other equipment cooling, etc. When encountering continuous rainy weather, the greenhouse needs to be well ventilated. Long-term rainy weather can easily cause the humidity in the shed to be too high, leading to the occurrence of diseases such as gray mold. At the same time, the ventilation should be determined according to the weather conditions. For example, the ventilation should be selected on cloudy days. It should be carried out around 12 noon. If the temperature is high, ventilation work needs to be done in advance.
1. How to cool down the greenhouse to 25℃
1. Sunshade cooling: A relatively common cooling method at present is mainly to use sunshading to cool down. Generally, some layers are laid on the top of the greenhouse. Black sunshade net etc. to block the sun.
2. Wet curtain fan cooling: The main thing is to turn on the fan to pull out the air in the greenhouse, so that the air pressure in the greenhouse becomes a negative pressure state, and then use a water pump to pump water to the wet curtain On the wall, when the outside air is sucked into the greenhouse, it will pass through the wet curtains to exchange water vapor, convert moisture to heat, and then evaporate the water, thereby achieving a cooling effect.
3. Micro mist cooling: It is similar to wet curtain fan cooling. The water is atomized first, and then the atomized water is allowed to absorb the temperature in the air in the greenhouse, and then the fan is used to remove the humid air. Discharge outside the greenhouse to achieve cooling effect.
4. Natural ventilation and cooling: The main method is to open the door curtains at both ends of the greenhouse to maintain ventilation to drain away heat and moisture and promote air circulation to achieve a cooling effect.
5. Cooling with air conditioners and other equipment: The cost of cooling is higher, and fewer farmers use this method to cool down.
2. Does the greenhouse need to be ventilated in rainy weather?
If it encounters continuous rainy weather, it is necessary to ventilate the greenhouse. Long-term rainy weather can easily lead to excessive humidity in the greenhouse. When the humidity in the greenhouse At about 70%-80%, diseases such as gray mold are very easy to occur, so ventilation work needs to be done, but there are also certain techniques for ventilation.
3. How to ventilate the greenhouse
1. Ventilation needs to be carried out according to weather conditions. If it is cloudy, venting is generally done around 12 noon, and the vent is controlled to 7 cm. , control the ventilation time to about 15 minutes. Pay attention to closing the air vent after 15 minutes and waiting for half an hour. After that, let the air vent for 15 minutes and use the interval ventilation method.
2. If the weather is good, the temperature is high and the temperature inside the shed is also high, ventilation work should be done in advance. At the same time, the width of the air vent should be gradually increased during ventilation to allow the temperature inside the shed to slow down. Lower slowly.
3. If the air outlet is blocked by an insect-proof net, then the width of the air outlet needs to be appropriately expanded when venting to prevent the insect-proof net from blocking the air.