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What if the input to the battery is from below and the output from above?

Andrew

Topic created June 24, 2019

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In most heating circuits it is shown that the entrance to the radiator is at the top of the radiator, and the exit is on the other side (such as a Leningrad from the bottom). But I saw another scheme - very rare, but which seemed very interesting to me. Namely - the entrance to the lower part of the radiator, and the exit to the upper on the other side. It seemed to me that in this scheme several physical qualities work:

Hot water displaces cold water.
Water supply from below displaces air.

Tell me, is there any expediency and experience in applying such a scheme? I would really appreciate it.

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Expert
Alexey Dedyulin
Expert
To answer
Good day, Andrey.
With all due respect, you confuse the options for connecting radiators with a heating circuit. Leningradka is not the principle of connecting radiators, but a one-pipe heating system. In the figure you attached to the two-pipe system, for clarity, look at scheme 1 and compare them.
If you pay attention, your return pipe goes in a separate riser, and in Leningrad the feed / return pipe is tied to one pipe. The coolant flows from one radiator to another and so on until it returns to the boiler again.
The heating system proposed by you is considered more efficient. It allows you to adjust the temperature regime of each individual radiator as opposed to a single-tube one. For the sake of objectivity, it is worth noting: the single-tube can also be adjusted using a bypass device. When choosing a home heating system, it is important to consider the area of one floor, for a one-pipe should not exceed 100 m2.
We return to scheme 1 and clearly see the flaws. Radiators 1-3 will always be fiery, 4-6 optimal temperatures, but 7-8 the coldest. As a result, in order to maintain comfortable conditions in rooms with radiators 7-8, it is necessary to turn on the boiler at a higher power, however, in rooms with radiators 1-3 it will be so hot that you have to open the windows. The rationality of gas consumption is not at the highest level.
Now let's move on to connecting the radiators.
You do not quite understand the principle. Heating water expands, which leads to its movement through the pipes, cooling water by gravity follows back to the boiler, and as a result there is a natural circulation.Reproduce the law correctly, only applied in practice, on the contrary. In any case, the air rises, regardless of how the radiators are connected. Therefore, taps for air weed are always installed in the upper left or right corner of the battery.
Regarding the efficiency of radiators, depending on their connection. Fundamentally divided into two types: one-way (scheme 2) and two-way connection (scheme 3). As you can see, the efficiency of your proposed connection is 80%. The maximum 100% just with a similar option only exactly the opposite.
As a result. The heating system in your circuit is correct, and the connection of radiators is not chosen the most optimal.
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