How to maintain greenhouse greenhouse irrigation system

How to maintain greenhouse greenhouse irrigation system

1. When irrigating daily, check that the working pressure and flow rate of each wheel filling group are the same as the design. Whether the drip irrigation pipe is completely discharged and recorded in the book;

2. During the irrigation process, the operator checks the site daily and repairs damaged pipes, on-site valves and drip irrigation pipes;

3. When irrigating weekly, open the end of each drip line in turn, and rinse the fine particles accumulated at the end of the dropper with a high pressure water stream. Pipes are opened one by one to ensure adequate pressure and must not be open to the community;

4. When the drip irrigation pipe is working, make sure that the outlet of the dripper is facing the sky to prevent the drip irrigation pipe from inhaling dust and causing blockage when the water is stopped.

The drip irrigation pipe is on the surface and shall not be buried with sand;

6. Air Valves During the irrigation season, it is required to always ensure that the lower ball valve is in the fully open position to remove all damage caused by air.

In the greenhouse, it is necessary to take cooling measures. A common method of air conditioning is to cool the curtain down. The wet curtain is cooled by external high temperature air passing through the wet curtain, humidified and cooled, and forms cold air. Cold air passes through the controlled room. The process of absorbing residual heat and then discharging it. This type of cooling typically requires certain parameters, such as greenhouse ventilation to increase the amount of ventilation required, as well as providing ventilation/kg for livestock and poultry farming.

The cooling of the wet curtain consists of two parts: the front is formed by cold air and the rear is the heat exchange of indoor cold air. Regarding the formation of cold wind, the relevant teaching materials are detailed and will not be described in detail here. Let us look at the cold part after entering the room: from the cold air into the room to leave, the heat exchange is completed, that is, all the cold air absorbs all the residual heat of the room. After the system reaches equilibrium, the heat loss in the room is equal to the heat loss from the cold air. After the cold air absorbs the residual heat of the room, the state changes, and the difference between the two states is measured and calculated to know the heat exchanged in the room. The formula is: Q = cpL△tmc, where Q-cold wind heat gain is indoor cooling load (Kc / h), L-cold air volume (m3 / h), c-air specific heat 0.24 (Kc / Kg °C), P - Air quality 1.2 (Kg / m3), △ tmc - indoor cold air and other humid heating temperature rise (°C), then Shenzhen Automobile Consignment Automobile Company then air volume L = Q / cp Δtmc.

 Since the actual temperature rise of the cold air is noted in practice, it is represented by the actual temperature rise Δt: L = Q / cp (Δtδ), where Δt - the actual temperature rise of the cold air (°C) leaves the room δ and the like. The difference between wet heat and actual temperature rise (°C).

Under normal conditions, the method can be used to calculate the amount of air required to cool the curtain.