Humidifying and cooling draught fan wet curtain device and control method

Abstract

The invention discloses a humidifying and cooling draught fan wet curtain device and a control method. A wet curtain and draught fans are arranged on the same side of a greenhouse of the device, therefore, the layout of a traditional wet curtain draught fan is optimized, sun shading of the draught fans on the interior of the greenhouse is reduced, and the daylighting property and the space utilization rate of the greenhouse are improved. The volume of fresh air entering the greenhouse and the circulating air volume in the greenhouse are adjusted through angle change of an air inlet side windowbaffle, therefore, the purpose of precisely regulating and controlling the temperature in the greenhouse is achieved, and the defect that the temperature in the greenhouse dramatically changes when the traditional wet curtain draught fan is started and stopped is avoided. Through positive pressure type cooling design, entrance of pathogeny and insect sources of greenhouse crops are reduced. Air is supplied through ventilation pipelines, and therefore the temperature and the humidity in the greenhouse are evenly distributed. The greenhouse humidifying purpose is achieved through inner circulation of air in the greenhouse and the wet curtain. Feedforward type control is adopted in the control method, and therefore the precision of temperature and humidity control is improved. The humidifying and cooling draught fan wet curtain device can be widely applied to greenhouses with the high environment control precision and the good cooling and disease and insect preventing effect.

Description

technical field [0001] The invention relates to the technical field of greenhouse cooling and humidification, in particular to a humidification and cooling fan wet curtain device and a control method. Background technique [0002] At present, in the design of the fan wet curtain cooling device, the wet curtain and the fan are respectively installed on both sides of the greenhouse. Through the fan exhaust, a negative pressure is formed in the greenhouse, so that the outdoor air passes through the wet curtain to cool down. The design of this cooling method is likely to cause uneven temperature distribution in the greenhouse, and as the distance between the wet curtain and the fan increases, the temperature difference between the wet curtain end and the fan end becomes larger and larger, which affects production. If the distance between the curtain and the fan exceeds 40 meters, the negative pressure fan wet curtain cannot be used to cool down. The traditional negative pressur...

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Problems solved by technology

The design of this cooling method is likely to cause uneven temperature distribution in the greenhouse, and as the distance between the wet curtain and the fan increases, the temperature difference between the wet curtain end and the fan end becomes larger and larger, which affects production. If the distance between the curtain and the fan exceeds 40 meters, the negative pressure fan wet curtain cannot be used to cool down

The traditional negative pressure fan wet curtain cooling, the control of the fan adopts simple start and stop control, which cannot obtain a suitable cooling ventilation volume, and causes the repeated rise and fall of the indoor temperature, and the sudden start and stop of the air flow, making the greenhouse The stability of the internal environment is poor, which affects the operation of the equipment and the growth of crops in the greenhouse

At the same time, the traditional negative-pressure fan wet curtain cooling device is easy to cause the inhalation of crop pathogens and insect sources in the greenhouse. Moreover, the wet curtain and the fan are located at both ends of the greenhouse, and air inlets and outlets need to be installed to provide space for the inside and outside of the greenhouse. The layout has caused difficulties. The wet curtains and fans at both ends of the greenhouse also block a large amount of sunlight from outside the greenhouse, which seriously affects the lighting of the wet curtain side and the fan side in the greenhouse.

In addition, the wet curtain is a device with relatively high humidification efficiency and good humidification effect. Especially during the heating period in winter, the humidity in the greenhouse is generally insufficient and humidification is required. However, the design of the traditional negative pressure fan wet curtain cooling device cannot be used in The air circulation through the cooling pad is formed in the greenhouse, so that the cooling pad cannot be used as a humidifier

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