Greenhouse heat collecting and releasing intelligent control device and efficient control method

Abstract

The invention discloses a greenhouse heat collecting and releasing intelligent control device and an efficient control method, and belongs to the field of facility garden environmental engineering. Agreenhouse water circulation solar collecting and releasing system of the device comprises a heat collecting and releasing device, a water supply pipeline, a water return pipeline, a water divider, awater collector, a heat storage water pool, a submersible pump, an automatic control system, a water temperature sensor, a mold surface device and a mold surface temperature sensor. The efficiency control method includes the steps of controlling the day heat collecting process of the heat collecting and releasing system through the difference value between the temperature of the surface of the mold surface device and the water temperature, controlling the night heat releasing process of the heat collecting and releasing system through the temperature of the surface of the mold surface device,and making the heat collecting and releasing system to operate at proper time. By means of the intelligent control device with the greenhouse water circulation solar heat collecting and releasing system, the heat collecting and releasing system is controlled to operate at proper time through the difference value between the mold surface temperature and the water temperature, and the heat collecting efficiency and heat collecting amount are large; meanwhile, invalid operating and energy consumption are avoided, and the system can also collect heat in cloudy days and hazy days after being started.

Description

technical field [0001] The invention belongs to the field of facility horticulture environment engineering, and in particular relates to a greenhouse heat collection and release intelligent control device and a high-efficiency control method; in particular, it relates to a method for realizing automatic operation and high-efficiency control of a greenhouse water circulation solar heat collection and release system by using a mold surface device. Background technique [0002] Traditional solar greenhouses mainly rely on the walls and ground to accumulate surplus solar heat energy during the day, which is used for heat release and temperature increase at night. However, the heat transfer between the wall and the ground is slow, and it is difficult to effectively collect and store enough energy to meet the needs of night crop production. In recent years, domestic scholars have proposed a new method of solar energy collection and release, that is, the greenhouse solar energy col...

AI Technical Summary

Problems solved by technology

These two methods have preliminarily realized the automation of the heat collection and release process of the system, and the system operation and management are simple, but there are still many problems; (1) According to the control method of the set time point, the biggest disadvantage is that it cannot accurately control the heat collection system at a suitable temperature. Because of different weather conditions, the time suitable for indoor heat collection varies greatly; when it is cloudy, the waste heat can be collected later and ends earlier, such as starting and stopping the system at a fixed time , will make the system run when there is no waste heat to collect, resulting in ineffective operation and energy consumption, and even loss of the original accumulated heat in the system

Conversely, under fine weather conditions, the system will start too late or end the system too early, which is not conducive to the improvement of heat collection

(2) According to the control method of indoor air temperature, it is impossible to directly determine whether there is solar waste heat that can be collected on the heat collector, and it is also impossible to control the system to run at a reasonable time

In the morning, sometimes the temperature in the greenhouse is low, but there is already strong solar radiation on the heat collecting surface of the heat collecting device. If judged according to the temperature, the operation of the system will be delayed, which is not conducive to the improvement of heat collection.

In the afternoon, sometimes the indoor temperature is high, but the solar radiation received by the heat collecting surface of the heat collecting device is already weak. If judged according to the temperature, the stop of the system will be delayed, resulting in ineffective operation and energy consumption.

(3) Whether it is based on the set time point or the control method based on the indoor temperature, the water temperature in the heat storage tank is not considered. The reasonable operation control method should refer to the water temperature.

Otherwise, there will be two problems of insufficient heat collection of the system or ineffective operation of the system

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