宜博电竞

所有 常见问题解答
如何给温室降温

 

温室降温的方法

     温室温度更高的原因可能是由于光线过多,也可能是由于通风不足,或者两者都有。专业温室温度控制是一种对温度变化做出高效、快速反应的动态系统。温室里的温度容易过高。人们给温室降温的方式在很大程度上决定了温室内的气候和农作物的价值。

 

下面是一些给温室降温的有效方法。

宜博电竞   1、使用通风

  一般情况下,温室都会设有出入口和适量的窗户,在炎热的夏季,打开窗户和通风口,可以促使外部气流涌入,及时更换温室中的空气。对温室进行通风是温室常用的降温手段,在外界气温不高的情况下比较适用,但是酷热的夏季,通风只能让外界酷热的气温涌入温室内部,并不能起到有效的降温目的。

宜博电竞  

 


 

 

2、使用遮阳物
  温室中温度的变化在一定程度上取决于阳光的照射,根据这个特性,使用遮阳网覆盖在温室表面,可以起到遮挡日光的作用,减少大棚日光的照射时间和区域,可以在一定程度上缓解温室中气温过高的问题。但是长时间的使用遮阳网会导致大棚植物不能及时进行光合作用,缺乏日光的照射,对大棚植物的生产有害而无益处。因此使用遮阳网只能起到应急作用,并不能作为一种长期对抗酷热温度的途径。

宜博电竞  

宜博电竞  

  

宜博电竞  

3、使用喷雾降温设备
  在实验过通风降温和遮阳网降温方法以后,我们发现传统的降温方法以及无法满足温室大棚降温的需要。我们迫切的需要一种新的降温方法,保证温室在夏季抵御炎热气温的工具。
  使用喷雾降温设备,将是未来大棚降温的主要选择。喷雾降温设备利用蒸发降温的原理,通过产生超细颗粒水雾,吸收周围区域内的热能,及时蒸发,从而降低周围的温度,是理想的新型降温设备。喷雾降温设备在国外的应用已经非常成熟,广泛应用在各个行业和领域,它可以作为车间厂房的降温设备,也可以作为室外咖吧,餐馆的降温设备。
  使用喷雾降温设备效果显著,不但降温效果好,而且使用成本小,节能环保,符合广大大棚种植物的利益。

宜博电竞  

 
5、湿帘风扇降温  利用水的蒸发降温原理再配以相关设备进行通风而实现降温目的降温方法叫湿帘风扇。
  湿帘风扇降温系统利用水的蒸发降温原理来实现了其降温的目的。湿帘风扇降温虽然比空调成本低但也需要配备相应设备。
 

 

宜博电竞  



Exclude light (and heat) from coming in


  • Use whitewash (paint-like material) that is sprayed onto the outside of the greenhouse for summertime in many areas. There is also chemical used to remove the white wash when one is done with it.


  • Install greenhouse curtains. Traditionally these are placed inside the greenhouse above the trusses (and can be open and closed by your climate computer).


  • Find a way to place curtains outside the greenhouse. These are unusual in North America, but I have seen them in China.


  • If you have excess light/heat year-round, you can install plastic/glass with some light exclusion built in.


  • There are some bubble systems which blow soap-like bubbles between the layers of glazing. These can have different characteristics including light exclusion. I know it sounds a bit crazy, but apparently it works. Note, though, that as far as I understand there is some dispute about who invented this (and owns the patent for it). Also I talked to one company about this for our greenhouse, but they were not very interested in quoting for us since we are out in the middle-of-nowhere and our greenhouse is measured in partial hectares not tens of hectares. I don’t know of anyone who works with small greenhouses on this technology.


  • Grow in a warehouse or underground (like in an old mine) instead of in a greenhouse and use lights rather than heat/cool with other systems.



Increase the humidity. 


  • Install misters (good ones are quite expensive, poor ones can create problems).


  • Find a way to wet the floor of the greenhouse during the day.


  • Swamp coolers (running air through a cardboard-like woven material that wicks water). This needs some extra design elements as they can only cool a certain amount of distance away from them.


  • Cooling foggers (there is probably a different name for these, but they basically create a mist throughout the greenhouse).



  • This only works in dry areas; you should try very hard to keep your greenhouse below 85% humidity—in most cases this is much more important than manipulating heat



Active Cooling Systems


  • Air conditioning. Ridiculously expensive (but effective). If you have specialized orchids or some other very challenging but valuable crop this might be worth exploring


  • Heat pumps. Basically a compressor system that runs water from underground or from a lake/river/ocean/pond into the greenhouse through radiator-like mechanisms to remove heat.



Venting 


  • Let as much air from outside run through the greenhouse as possible


  • Roof vents are most common. Some greenhouses allow the roof to open nearly 100%, but most just have vents at the roof that open as the greenhouse is too cold


  • Side vents. Usually the side wall (or much of it opens and allows a breeze through).


  • Fans. Fans push hot air out (negative pressure) or push outside air in (positive pressure — better for insect control if you screen on the outside of the fan). You can also get foggers/misters/swamp coolers that attach to many fans and thus combine these with humidity increase strategies.



Air movement

Use horizontal airflow fans (HAF) to move air in a circular pattern around the greenhouse. Traditionally these are installed above the crop, but I have also seen them installed under benches.


This helps to reduce stratification (layers of different temperature). This way you don’t have a situation where the head of, say, your tomato plant which is 11 feet above the ground (or whatever you have) is much hotter than the bottom of the plant. The plants will respond to the temperature of their head more than other parts, so often you want the whole plant to be similar in temperature.


This also keeps pockets of increased humidity from building around your plant leaves (you want to prevent this).



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