Air conditioner control method for greenhouse low-temperature refrigeration

Abstract

The invention provides an air conditioner control method for greenhouse low-temperature refrigeration. The air conditioner control method comprises the steps that S1, the current outdoor environment temperature T4 and the indoor unit evaporator pipe temperature T2 are detected; S2, the temperature interval to which the outdoor environment temperature T4 belongs is judged, wherein the outdoor environment temperature T4 is divided into a plurality of temperature intervals, each temperature interval corresponds to the capacity requirement of one outdoor unit, an air conditioner is controlled to operate in a refrigeration mode, and an outdoor unit of the air conditioner is controlled to operate according to the current outdoor environment temperature T4 and the capacity requirement of the corresponding temperature interval; and S3, the capacity requirement of the outdoor unit is adjusted according to the indoor unit evaporator pipe temperature T2, when the environment temperature is high or the evaporator pipe temperature is large, the refrigeration effect can be improved, refrigeration and cooling are rapid, the low refrigeration temperature can be maintained, and the greenhouse low-temperature refrigeration application range is met along with reduction of the indoor and outdoor environment temperature.

Description

technical field [0001] The invention relates to an air conditioner control method, in particular to an air conditioner control method for low-temperature refrigeration in greenhouses. Background technique [0002] Fruit trees are now planted in many areas in the north. For example, the maturity period of cherry trees is generally from March to June. Many fruit farmers hope that the fruit trees will mature before the lunar calendar, and sales in different seasons often lead to high profits. Therefore, this requires the fruit trees to enter the dormancy period earlier than normal growth, which requires the construction of greenhouses, the use of refrigeration equipment to reduce the temperature in the shed, and let the fruit trees enter dormancy earlier. [0003] Because the temperature in the greenhouse needs to be maintained at 5°C to allow the fruit trees to go dormant smoothly, the air-conditioning equipment currently on the market generally has a minimum cooling setting ...

AI Technical Summary

Problems solved by technology

[0003] Because the temperature in the greenhouse needs to be maintained at 5°C to allow the fruit trees to go dormant smoothly, the air-conditioning equipment currently on the market generally has a minimum cooling setting temperature of 16°C, which cannot meet the requirements. Very low, the evaporator of the indoor unit is prone to frost, and the control method needs to be modified to achieve

However, the cost of general cold storage equipment is too high and does not meet the expectations of fruit farmers. Therefore, it is necessary to design an air conditioner and control method that can be used for low-temperature refrigeration in greenhouses.

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