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Siphon, Ebb and Flow

西班牙文版, Espanol version 

Siphon
1 A pipe or tube fashioned or deployed in an inverted U shape and filled until atmospheric pressure is sufficient to force a liquid from a reservoir in one end of the tube over a barrier higher than the reservoir and out the other end.
2兩 端的大氣壓力一樣,但管內兩端的水受重力作用而各自下墜,下墜瞬間,在圓弧頂部拉出一個真空,因真空而有壓力差,此時兩端的大氣壓 力再次從兩端將兩管的水壓回,但壓回的力量是大氣壓力減去管內的水壓(F=(Patm-PH2O)*A),而長管內的水比短管內的水還要重,所以壓回的力 量是短管的壓力大於長管的壓力,所 以,虹吸管內的水就會不斷的由短管端流入而由長管端流出。

3如果我們用兩根連通管,所以效率會變成兩倍。

4如果用兩根連通管,但是其中一個連接抽水馬達此時一根連通管是抽水,所以另一根把水送回大氣壓力將兩管的水平衡,所 以,一個馬達可以有兩倍的動力水就會不斷的循環。


問題1:請比較上連通管與下連通管的差異?
問題2:請問雙連通管時,管徑與高度差的關係?

Basic Ebb and flow operation 



1 As liquid fills the dosing tank, the level of liquid in the tank and inside the siphon bell rise at the same rate. (The siphon bell is open at the bottom). The siphon is vented to the atmosphere through the vent piping. This rising action continues until the level of the liquid reaches the open end of the outside vent pipe.
2 Once the liquid reaches the out- side vent pipe, it creates an air seal. As the level of liquid continues to rise in the tank, the liquid level in the bell continues to rise, but at a much slower rate. At the same time, the head of water in the tank exerts pressure on the air trapped in the top of the bell and the long leg of the trap. The air in the long leg of the trap is forced towards the invert of the trap.
3 As the liquid in the tank approaches the high water line, the liquid in the bell will have risen to a level just short of the top of the trap, and the air in the long leg of the trap will have descended to the invert of the trap.
4 As the liquid in the tank reaches the high water line, a volume of air is forced around the invert of the trap and out through the discharge leg of the siphon. The escaping air relieves the back pressure within the siphon and the liquid inside of the bell will rush up and fill the siphon trap thereby starting the siphon action.
5 The liquid is drawn out of the tank until the liquid in the tank reaches the bottom of the bell. Then the siphon draws air and the siphon action is stopped.
inside the siphon bell rise at the same rate. (The siphon bell is open at the bottom). The siphon is vented to the atmosphere through the vent piping. This rising action continues until the level of the liquid reaches the open end of the outside vent pipe.

Basic Bell Siphons

1.As liquid fills the dosing tank, the level of liquid in the tank and inside the siphon bell rise at the same rate. (The siphon bell is open at the bottom). The siphon is vented to the atmosphere through the vent piping. This rising action continues until the level of the liquid reaches the open end of the outside vent pipe.
2. Once the liquid rise in the tank and the inner liquid level reaches the outside vent pipe, the liquid will be overflow to the outside vent pipe.
3. As the liquid in the tank have descended to the invert of the trap, you have to evaluate the rate of fill-in and vent-out.
4. The liquid is drawn out of the tank until the liquid in the tank reaches the bottom of the bell. Then the siphon draws air and the siphon action is stopped.






Pressure type Single Automatic Siphons



1 As liquid fills the dosing tank, the level of liquid in the tank and inside the siphon bell rise at the same rate. (The siphon bell is open at the bottom). The siphon is vented to the atmosphere through the vent piping. This rising action continues until the level of the liquid reaches the open end of the outside vent pipe.





2 Once the liquid reaches the out- side vent pipe, it creates an air seal. As the level of liquid continues to rise in the tank, the liquid level in the bell continues to rise, but at a much slower rate. At the same time, the head of water in the tank exerts pressure on the air trapped in the top of the bell and the long leg of the trap. The air in the long leg of the trap is forced towards the invert of the trap.




3 As the liquid in the tank approaches the high water line, the liquid in the bell will have risen to a level just short of the top of the trap, and the air in the long leg of the trap will have descended to the invert of the trap.



4 As the liquid in the tank reaches the high water line, a volume of air is forced around the invert of the trap and out through the discharge leg of the siphon. The escaping air relieves the back pressure within the siphon and the liquid inside of the bell will rush up and fill the siphon trap thereby starting the siphon action.



5 The liquid is drawn out of the tank until the liquid in the tank reaches the bottom of the bell. Then the siphon draws air and the siphon action is stopped.

水會一直流出,直到水位低到讓潮汐開關吸入空氣。然後,潮汐開關回歸起始位置。





3A
Operation of Dual Alternating Automatic Siphons
1 Two siphons are set in a single tank at the same elevation. Both traps are primed with water (figure 3a).

3B
2 As the tank fills, the siphons are sealed and the air in the long leg of each trap descends towards the invert of its trap (figure 3b; please see the 'Operation of Single Automatic Siphons'). The air displaces nearly half of the water in the trap.

3C
3 If the siphons were set perfectly, they would both go into operation at the same time. Slight variations, however, are inevitable, and will bring one siphon into operation before the other (figure 3c).

4 The first siphon to operate will empty the tank and shut off with its trap fully primed with liquid. The siphon that did not operate will have lost nearly half of the liquid in it's trap as described in stage 2. Since it did not operate, its liquid was not replaced (figure 3d). The extra air in this siphon will cause it to go into operation next, resulting in alternating operation.
3D


4A
None Drilled Siphon Operation
1. A reef-ready, or drilled tank, is of little value to those that already have a tank up and running and don't want to break it down to have it drilled. It is for this situation that hang-on overflows were invented. They hang on the back of the aquarium and extend over into the aquarium. Hang-on overflows (see figure A) are less reliable and generally can handle less water flow than a "drilled" overflow. This is because overflows must fight against gravity and flow the water "over" the top of the tank rather than through a hole in the tank. Hang-on overflows use a technique called "siphoning" to move the water up and over the edge of the tank and down into the sump. As long as the siphon is maintained, there is no problem, but if the siphon is broken for any reason, then water will cease to flow into the sump and the display tank will continue to fill up until either the sump is drained or water flows over the top of the display tank. (see figure 4B)

4B



2. If the siphon tube fills with air, then the siphon will break, preventing any water from draining from the tank. The water level in the tank will overflow until the sump runs out of water, resulting in a flood.
After exiting the overflow, water flows through the standpipe and down the drain line into the sump. From there, the return pump (named such because it "returns" the water to the tank) pushes the water back up into the display tank. This raises the water level in the display tank, which in turn causes water to spill over the top of the overflow, and starting the whole cycle over again.(see figure 4C)



3. There are very few reasons why a sump is not the best choice. One potential downside to a sump is increased noise. It can sometimes be a challenge to eliminate the noise of water cascading into a sump. In most cases the sound can be easily reduced to inaudible or nearly inaudible levels, but getting to that point can sometimes require a good deal of effort. Reducing the noises associated with sumps is a topic that will be covered in Part II. Another reason to avoid installing a sump is lack of space.

5A

Floating Trash Can with Siphon Operation



5B

1. Cause there are some floating trash within the tank, it pollutes the water. We modify the siphon tube to a raft tank named STOPPER. (see figure 5A)

2. When the raft is at the low position, fill the tank till the raft tank reach the high position.  Power on the pump, while it is OPEN status. (see figure 5B) So water fill the tank. When raft reach the high position, it is CLOSE status. (see figure 5C) So the Floating Trash will overflows into the raft tank till it reach the low position.

5C



3. However, the floating trash will still stay within the raft tank, cause the siphon will overflow from the bottom inlet. (see figure 5D) Then it fills again.


5D






Adjustable of External Loop
1 As liquid fills the dosing tank, the level of liquid in the tank and inside the siphon bell rise at the same rate. (The siphon bell is open at the bottom). The siphon is vented to the atmosphere through the vent piping. This rising action continues until the level of the liquid reaches the open end of the outside vent pipe.




2 Once the liquid reaches the out- side vent pipe, it creates an air seal. As the level of liquid continues to rise in the tank, the liquid level in the bell continues to rise, but at a much slower rate. At the same time, the head of water in the tank exerts pressure on the air trapped in the top of the bell and the long leg of the trap. The air in the long leg of the trap is forced towards the invert of the trap.


3 As the liquid in the tank approaches the high water line, the liquid in the bell will have risen to a level just short of the top of the trap, and the air in the long leg of the trap will have descended to the invert of the trap.

4 As the liquid in the tank reaches the high water line, a volume of air is forced around the invert of the trap and out through the discharge leg of the siphon. The escaping air relieves the back pressure within the siphon and the liquid inside of the bell will rush up and fill the siphon trap thereby starting the siphon action.

5 The liquid is drawn out of the tank until the liquid in the tank reaches the bottom of the bell. Then the siphon draws air and the siphon action is stopped.










留言

CROXWORD寫道…
hello.
我把水族缸馬達150W,拿來用養耕共生系統
外管是4吋PVC,長度20cm
內管是2吋PVC,
泄管是1吋PVC,
只有第一次是OK.
第二次就變成溢流,然後就一直溢流
Unknown寫道…
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https://www.facebook.com/qhdrainage/
LINE ID: chuan2246
公司網址: http://www.qh-drainage.com.tw/
1.地板排水有無防臭裝置自家最清楚
2.讓建築物地板排水多一項防蟲防臭隔音特點
3.地板排水疏通,清潔以前要靠藥物或水電工,使用此裝置後由自家清潔維護既可.最終受益於消費者
4.結構簡單,拆解清潔容易,儲水功能看的見

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黑檸檬

黑檸檬
Dried lemons are actually limes and are used heavily in Persian Gulf and also Iranian cuisine where they add a strong bitter flavor in addition to sourness. They are made by boiling ripe limes in salt water, and then sun drying until the insides turn black. The outside color varies from tan to black. They are sold whole or ground.

Black Lime is a spice used in Middle Eastern dishes. It is made by boiling fresh lime in salt water and sun drying until the insides turn black. The outside color varies from tan to black. It is sold whole or ground.

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USE Black limes are usually used in legume, seafood or meat dishes. They are pierced, peeled or crushed before adding them to the dish. After cooking they become softer and edible. They can also be powdered and added to rice dishes. Powdered black lime is also used as an ingredient in Gulf-…

為何冰箱冷凍室非得是零下18度?

為何冰箱冷凍室非得是零下18度? 不少家庭的冰箱有led面板,可顯示冷藏室和冷凍室溫度。每次看到那個零下18℃,不少人,包括筆者在內就會禁不住提出一個小疑問:為什麼冷凍室溫度非得是零下18℃?最多零下1℃不就結冰了嗎?搞這麼低溫度實在是浪費電呢。

聰明如很多人是這樣推測的

百思不得其解,於是很多人,包括筆者在內就開始推測後面的機制了。冷凍室的零下18℃其實不費電,相反,它是節約電力的一個好措施。為何?

冰箱隔一段時間,內部溫度升高後,它就要啟動壓縮機,嗡嗡嗡的。頻繁啟動壓縮機不僅耗電,冰箱的壽命也會降低,還有就是很吵人。怎麼辦?簡單,先把冷凍室的溫度搞得低低的,比如零下18℃左右。


然後,冷凍室的冷氣往上走,來到冷藏室,如此,就能長時間保持冷藏室的溫度處於0到8℃以內了。

待冷凍室的冷氣散失過多,溫度升高到零下幾度時,再啟動冰箱的壓縮機把溫度再次降到零下18℃,如此,冰箱的啟動次數就變少了。

實際是這樣嗎?很遺憾,不是。

原因之一:不一樣的水

水到零度以下就結冰了,這是絕大多數人的認識。然而仔細一想,這不適用於冰箱的冷凍室。因為冷凍室存放的不是上百升礦泉水,而是各種各樣的食物。

食物中含有大量水這沒錯,但這些水同時含有大量的鹽、糖等物質。就像每1升海水中大約含有35克鹽,所以平均起來,要到零下1.33℃時海水才會結冰。

因此,要想把食物凍結,並不是溫度只要達到水的冰點就可以,得保證足夠低的溫度,食物中的水才能凍結,這很重要,因為食物中只要有液態水存在,這就等於是為各種細菌的繁殖提供了必備條件。

圖為牛肉薄片在不同溫度和不同時間內測得的牛肉中凍結水量的曲線。

當牛肉薄片的溫度為零下4℃時,只有70%的水分被凍結;溫度下降到零下9℃左右時,也還有3%的水分未凍結;即使牛肉薄片的溫度降低到零下18℃時,也不是100%的水分都被凍結住。

原因之二:嗜冷微生物

根據微生物對不同溫度的適應範圍,可將微生物分為三大類,嗜熱菌、嗜溫菌和嗜冷菌。在食物的冷藏和冷凍過程中,我們面對的「敵人」是嗜溫菌和嗜冷菌。

一般來說,能引起食物腐敗和食物致毒的嗜溫菌,在低於3 ℃情況下不產生毒素,當然,個別菌種例外。

而對於嗜冷菌,一般得在零下10 ℃到零下12 ℃時才會停止生長。

有的黴菌甚至要到零下15~零下18 ℃時才會停止生長。

瞧,我們以為,零下幾攝氏度後微生物就被殺死或停止繁殖了,但…