A solar greenhouse wet curtain fan circulation ventilation cooling system and its control method

Abstract

The invention discloses a circulating ventilation and cooling system for a wet curtain and a fan of a solar greenhouse. The system is composed of a plurality of circulation fans installed at the top of a greenhouse, an air-supply fan arranged on a wall at a light back side of the greenhouse, a wet curtain device arranged at the outer side of the air-supply fan, a ventilation pipeline communicatedwith the air outlet of the air-supply fan, a plurality of regional pipelines, a plurality of air hose branches, a plurality of air hose drying branches. After cooling by the wet curtain device, external air is sent to the ventilation pipeline by the air-supply fan. The plurality of regional pipelines are arranged in a crop region inside the greenhouse respectively and are communicated with the ventilation pipeline. The plurality of air hose branches communicated with the regional pipelines are used for leading air into the greenhouse; and first blast capacity adjusting valves are arranged at the air hose branches. The plurality of air hose drying branches are communicated with the regional pipelines are used for leading dried air into the greenhouse; and second blast capacity adjusting valves are arranged at the air hose drying branches. According to the circulating ventilation and cooling system disclosed by the invention, the cooling speed is fast and the temperature and humidity distribution is uniform.

Description

technical field [0001] The invention belongs to the technical field of agricultural facilities, and in particular relates to a solar greenhouse wet curtain fan circulation ventilation cooling system and a control method thereof. Background technique [0002] Our country is hot and hot in summer, if we only rely on natural ventilation and external sunshade devices, it is difficult to achieve the ideal cooling effect. Due to the airtightness of the greenhouse, the temperature in the greenhouse rises rapidly in summer, and the temperature can often reach above 40°C. Too fast heating and high temperature will damage the tops and leaves of the plants, and adversely affect the quality and yield of crops in the greenhouse. lead to crop yield reduction. Take the common greenhouse for planting leaf lettuce as an example. Leaf lettuce likes a cool environment, and the yield is the highest and the quality is the best when the growth temperature is 15-20 degrees. If the temperature co...

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Problems solved by technology

However, due to the small north-south span of the solar greenhouse and the narrow and long east-west characteristics, the wet curtain fan cooling system used in the traditional large conjoined greenhouse has not played a good role in the solar greenhouse. The main reason is that if the wet curtain and the fan are installed separately in the solar On the gable wall at the east and west ends of the greenhouse, due to the long distance between the east and west of the solar greenhouse, there is often a large difference in temperature and humidity between the east and west ends of the solar greenhouse. Irregular growth and high humidity can easily induce diseases

However, if the wet curtains and fans are installed on the north and south sides of the solar greenhouse (patent application number 201310231815.6), but due to the short span distance between the north and the south of most solar greenhouses, the number of wet curtains and fans that need to be installed is large, and the investment is large. Problems such as high cost are difficult to apply in practice

In addition, some people have researched and invented the patent application number (201310186420.0) of the small wet curtain and fan integrated box, which is placed in the greenhouse or outside the greenhouse. Although the investment cost has been reduced, it is difficult to overcome the above-mentioned uneven temperature and humidity.

At present, my country's solar greenhouses mainly produce vegetables in winter, spring, and autumn. In summer, due to high temperature and other reasons, most of them rest and it is difficult to produce

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