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In order to scientifically evaluate the design and manufacturing quality of greenhouses and protect the legitimate rights and interests of users to use greenhouses, we need to test and identify the intelligent greenhouse temperature and humidity monitoring system . Here, the technology department of Xinxin Electronic Technology Co., Ltd. discusses the main evaluation criteria summarized during the test of the intelligent greenhouse temperature and humidity monitoring system .
1.Measurement time of temperature performance index
For the measurement of greenhouse temperature performance indicators, the currently adopted method is to measure the environmental parameters of the greenhouse in the morning, middle, and night in a day under the conditions of heat preservation (or rise and fall), and then take the average of the three measured values as the average value. Greenhouse insulation (or rise, fall) performance index evaluation value.
But after our technicians calculated the relationship between the measurement time and the temperature change in the greenhouse, it is not difficult to see that although the average temperature change during the 24 hours a day is not large, the temperature change in some time periods is particularly drastic, especially The temperature rise between 12 noon and 15 pm is 5-7 degrees. From this point of view, the temperature deviation caused by the different measurement time is obviously too large.
2.Measurement point of temperature and humidity value
Temperature and humidity measurement points can be evenly distributed indoors, and the height of the measurement points can be set to about 200 Cm (depending on the height of the shed). Try to avoid choosing a spot in the middle of the crop because the spot in the middle of the crop is too close to the crop. The exhaled moisture during photosynthesis and transpiration will affect the reading of the temperature and humidity recorder . It can be seen from the measurement records of our technicians that when the crop height is higher than the measurement point, the measured temperature and humidity values have a large deviation.
3.Measurement of transmittance
Understanding the light transmittance of a greenhouse needs to start from four aspects: the light transmittance of the materials used to build the greenhouse; the light transmittance of the shade net; the light transmittance in the greenhouse; and the indoor light transmittance when the shade net is deployed.
In order to avoid the influence of the above factors, our technicians suggest that the identification experiment should be carried out in the following situations as much as possible: when the greenhouse is newly built; when the lighting surface of the greenhouse is cleaned after heavy rain; when possible, it is cloudy or at noon; there is no obstruction above the measuring point ; The measuring point height is 180Cm ~ 200 Cm, to avoid being obstructed by the experimenter.
4. Detection of automatic control performance
The self-control performance is mainly reflected in two aspects:
1) The automatic control system can automatically adjust the indoor temperature, humidity, and light intensity in an economical way, according to the growth needs of the crops, watering and fertilizing, CO2 gas, etc., as required.
2) The main performance indicators (measurement accuracy, stability and hysteresis) of the sensors used in the greenhouse temperature and humidity monitoring system are qualified. The sensor performance index value can be determined according to the needs of the crop. Too high will cause waste of equipment resources (high-precision sensors are more expensive), and too low will lose the meaning of self-control.
5. Inspection of plant protection facilities
Different greenhouses will have different plant protection facilities according to user requirements. The verification of these plant protection facilities can be performed with reference to the standards of similar plant protection machinery.
The intelligent greenhouse temperature and humidity monitoring system is a modern agricultural facility with relatively complete functions. When conducting comprehensive assessment, attention should be paid to the influence of various natural factors. The test report should indicate the evaluation of various data, environmental conditions, vegetation growth, and measurement Time, etc. In other words, the evaluation technician must make objective and detailed evaluation data records in order to formulate a more detailed, more feasible, and more intelligent solution for the intelligent greenhouse temperature and humidity monitoring system.
July 9, 2015
Chengdu Xinxin Electronic Technology Co., Ltd. Editorial Department
Editor: Little Devil in Gourd