Cucumber hi light, with the change of light temperature, its production also has a significant change, when a certain period of light and heat conditions will cause discomfort. Therefore, light and heat conditions have a very important role in the production of cucumber. In particular, effective accumulation of light is even more important. The effective pluvial measurement instrument can measure light during the cucumber planting process, and analyzes the agricultural meteorological viewpoints. There are many reasons for the normal growth of cucumbers and the loss of production due to friends, including photothermal conditions. It has a great influence on the yield. It is currently analyzed that the light and heat index provides a scientific management basis for the production of greenhouses.

Based on the greenhouse shed production and temperature data accurately recorded by the cumulonometer and using the solar radiation observation record of the meteorological observatory, the relationship between the successive yield changes of cucumber and the photoperiodic conditions during the corresponding period can be seen. It can be seen that in the period of the melon period ((5-} - June) Cumulative lighting (average daily accumulated light) and cumulative temperature (average daily accumulated temperature) in the interval between two harvests (2 -} 3 days) are positively related to the current production and sometimes affect The next day's output, the average daily accumulated light and the average daily accumulated temperature for the first 5 days before harvesting, also had a positive correlation with the current production.

Under a certain level of fertilizer and water conditions, an effective cumulonometer was used to determine that the accumulated temperature and accumulated light was above a certain value, the yield was normal, reached a certain level, and the production peak appeared; below a certain limit, the yield immediately decreased. Accumulation of accumulated temperature is too high and is not conducive to yield formation. It has been observed that the development of cucumber melons, from the opening of female flowers to the grown-up commodity size during the melon period, generally takes 7 to 10 days, and the early development is slow and the late development is fast. In the 3 to 5 days before harvesting, the melon strips are rapidly enlarged, and the growth can account for more than 50 of the whole melon weight. Therefore, in addition to suitable fertilizer and water conditions before the harvest, the accumulated temperature and accumulated light will directly affect the formation and transport of photosynthetic products. Insufficient light and temperature conditions will significantly affect the yield of cucumber.

Cooling Tower

The hot water in the main machine room passes through the pipes, transverse pipes, curved pipes and central pipes with a certain pressure through the water pump, and circulates the water pressure into the water distribution system of the cooling tower, and evenly spreads the water on the filler through the small holes on the water distribution pipe; The dry air with low Han value enters the tower from the bottom into the air net under the action of the fan. When the hot water flows through the packing surface, it forms a water film and exchanges heat with the air. The hot air with high humidity and high Han value is extracted from the top, and the cooling water drops into the bottom basin, and flows into the main machine through the outlet pipe.



Generally, the air entering the tower is dry and low wet-bulb temperature air. There is obviously a concentration difference and kinetic energy pressure difference of water molecules between water and air. When the fan is running, under the effect of static pressure in the tower, water molecules continue to evaporate into the air and become water vapor molecules. The average kinetic energy of the remaining water molecules will be reduced, thus reducing the temperature of circulating water.



From the above analysis, it can be seen that the evaporative cooling has nothing to do with the air temperature (usually dry bulb temperature) being lower or higher than the water temperature. As long as the water molecules can continuously evaporate into the air, the water temperature will decrease. However, the evaporation of water into the air will not continue indefinitely.



When the air in contact with water is not saturated, the water molecules continuously evaporate into the air, but when the air on the water-air contact surface reaches saturation, the water molecules cannot evaporate, but are in a dynamic equilibrium state. The number of water molecules evaporated is equal to the number of water molecules returned from the air to the water, and the water temperature remains unchanged. It can be seen from this that the drier the air in contact with water, the easier it is to evaporate, and the easier it is to reduce the water temperature.

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