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Video tags
Subtitles
Russian
00:00:00
in most cases, you can install a00:00:02
hydraulic accumulator or a hydraulic tank with a reserve00:00:04
volume, but it happens that either00:00:06
the cut is not enough or there00:00:08
is nowhere to place this hydraulic accumulator, in00:00:10
this case the most correct solution00:00:12
And in general, in principle, the correct solution00:00:14
would be to calculate the volume of the00:00:16
hydraulic accumulator. By the way, the sponsor of00:00:18
today's video is a company that has become a00:00:19
company that produces plumbing00:00:21
equipment for professional00:00:22
installation of systems, including membrane00:00:25
tanks for heating systems in red and00:00:27
hydraulic accumulators for00:00:28
water supply systems in blue with both00:00:31
vertical and horizontal00:00:32
installation, you can familiarize yourself with the options and00:00:34
prices by following the link in the description of the00:00:36
video in this video I tell you How to00:00:38
calculate membrane tank or00:00:40
hydraulic accumulator for00:00:42
water supply systems What is a hydraulic accumulator00:00:44
and how does it work How to replace the bulb in it00:00:46
I have already made a video on this topic I am00:00:49
putting a link to the playlist in the tips00:00:51
for those who are not yet in the know, I will say00:00:53
briefly that the membrane tank is an00:00:56
expansion tank and a hydraulic accumulator00:00:58
is practically the00:01:00
same thing, only they all have00:01:02
slightly different purposes; in order00:01:04
for the water supply system to work00:01:05
correctly, first of all, you need to00:01:07
choose the right pump; the pump is00:01:10
selected according to the estimated water flow in00:01:13
your water supply system; in short, a00:01:15
weak pump will not be able to supply00:01:16
your system water and an overly powerful00:01:19
pump will work with overloads,00:01:20
so it simply will not be able to work for a long time due to the fact00:01:22
that it was often00:01:24
switched on and switched off frequently. More00:01:26
details about the selection of pumps in another video. The00:01:28
next thing we need to00:01:29
organize a water supply system is automation. About the00:01:32
choice of automation already there is a video on the00:01:34
channel You can watch it in00:01:36
the tips after watching the video if00:01:38
your pump has a frequency00:01:40
converter and a frequency00:01:41
converter This means that the pump00:01:43
rotates smoothly At the speed00:01:45
required If you open one00:01:47
faucet, water flows at the same speed If00:01:49
you open the second faucet at in the second and00:01:51
first faucets, water flows at the same00:01:53
speed, but the pump shaft rotates faster.00:01:55
In this case, you do00:01:58
n’t need a hydraulic accumulator, but you do need it. It is absolutely00:02:00
small in size to simply dampen00:02:03
hydraulic shocks. Pumps with a frequency00:02:05
converter are00:02:07
quite expensive today. Therefore, in in00:02:08
most cases, a conventional pump is used.00:02:11
Usually the pumps are turned on00:02:13
at full power either instantly or with a00:02:16
soft start. Again, it depends on the00:02:17
electronics of the pump. In these cases,00:02:19
it is necessary to choose the right size of00:02:21
the hydraulic accumulator; if the hydraulic accumulator00:02:23
is too small, then the pump00:02:25
will work less than it could there is00:02:27
simply no point in working on a00:02:30
hydraulic accumulator that will be filled00:02:31
in a second after the00:02:33
pump turns on. If the hydraulic accumulator is00:02:35
too large, then in this case00:02:37
you will have to find quite a lot of space00:02:39
to install this00:02:40
huge hydraulic accumulator in addition to this due to the00:02:42
fact that the water there will be00:02:43
renewed very slowly it00:02:45
will simply stagnate there; a much00:02:47
larger volume of hydraulic accumulator than is00:02:49
planned for your system. I think you00:02:51
should only buy it00:02:53
if you mistakenly purchased a pump of00:02:55
much greater power than what00:02:57
your system requires; just calculate the00:03:00
water supply from the hydraulic accumulator in00:03:02
case of a water outage. I don’t. I think00:03:04
it’s correct. I think that you can rely on this00:03:06
only if00:03:07
power outages occur00:03:09
frequently and for short periods of time. Even in this00:03:11
case, I would rather purchase a separate00:03:14
uninterruptible power supply unit for the pump than a00:03:16
huge hydraulic accumulator, which you00:03:18
still need to think about where to place it for reference00:03:20
in your hydraulic accumulator, approximately00:03:23
30- 40 liters of water from its total volume,00:03:27
roughly speaking, a 100-liter tank You have a00:03:30
water supply of only three buckets I00:03:31
will generalize a little if, according to calculations, you need to00:03:34
install a hydraulic accumulator of 80 liters in size00:03:37
And you Install 100, then there00:03:40
will be nothing wrong with that, the system will00:03:42
work perfectly If you00:03:43
you need 80 And you are planning to install00:03:46
500, then there is no point at all in00:03:48
such a large size,00:03:50
people install hydraulic accumulators in order00:03:52
to have some kind of water supply,00:03:54
do not forget that this huge00:03:56
hydraulic accumulator, even for 200 liters, is needed00:03:58
somewhere else than buy an expensive00:04:01
hydraulic accumulator of a huge size00:04:03
just to have a supply of water in00:04:05
this case it is better to spend this money00:04:06
on purchasing a storage tank and00:04:09
put it somewhere in the attic on the second00:04:11
floor to the third. Does anyone have the00:04:12
opportunity to have an00:04:14
emergency supply of water? Well, about how to00:04:17
organize a storage tank, that00:04:18
is, fill it and get water from there,00:04:21
you can look at the tips after00:04:23
watching this video, it will be somewhere00:04:25
here00:04:26
today. Our task is to calculate00:04:29
the minimum possible volume of00:04:31
the hydraulic accumulator in order to make it00:04:33
comfortable to use the system and in00:04:35
order for the pump to work for as00:04:37
long as possible in order for the hydraulic accumulator to be00:04:39
called a hydraulic tank, this is a very00:04:41
long pronouncement; in order for the hydraulic tank to00:04:42
work for a long time and the system to be00:04:45
comfortable to use, the00:04:48
pressure difference between turning the pump on and off00:04:50
must be set between one00:04:52
and one and a half bar; also, the fillability of the00:04:54
hydraulic accumulator should not be too00:04:56
high, the pressure in an empty hydraulic tank00:04:58
should be 10 times lower than the00:05:01
pump activation pressure, so you00:05:03
will get a small amplitude of operation of00:05:04
the bulb, as a result of which the bulb itself00:05:07
will work much longer, but in this00:05:09
case you will have a small supply of00:05:11
water, this is up to 30 percent of the total00:05:13
volume of the tank If00:05:16
you will lower the air pressure in an empty accumulator,00:05:18
thus you will increase the supply of water in00:05:21
case of a power outage, but00:05:23
most likely you will get a larger00:05:24
amplitude of pressure drop in the system and00:05:27
more active operation of the00:05:28
accumulator membrane, as a result of which it will00:05:30
wear out faster, the pump activation pressure00:05:32
should be such that at the very00:05:35
top point we got the minimum00:05:38
pressure drop before the00:05:41
pump turns on, let’s say if the hydraulic accumulator and00:05:43
automation are installed in the base. And I00:05:45
need to get a00:05:47
pressure of one and a half bars in the shower00:05:49
mixer on the third floor, then I have to calculate the height.00:05:51
At what height is the00:05:53
point where I should get those00:05:55
let's say the most one and a half bar in my case is00:05:58
7 meters with a pressure drop of 0.1 bar for00:06:03
each meter of height, I multiply 01 by 700:06:07
meters and get 0.7 bar so in order to00:06:12
get that cherished one and a half bar at the top on the third floor00:06:14
pressure switch in the basement I00:06:17
will have to set one and a half plus 0.7,00:06:19
that is, 2 and 2 bar, taking into account a00:06:22
pressure drop of one or one and a half bar, the00:06:24
pump shut-off pressure I will have to00:06:27
make 3.2 or 3.7, I will take 3.2 bar00:06:31
in order for us it was easier to consider00:06:32
let's say If you want to get a00:06:34
shutdown pressure of 3.7 A, your pump at00:06:38
your point Where the automation is located can00:06:40
create only 3 bar in this case you will00:06:42
never get the coveted 3-7 bar00:06:44
the automation will never turn off the pump00:06:47
unless in the pump is00:06:49
installed Electronics and the electronics00:06:51
will turn off the pump from overheating before00:06:55
it burns out, of course it won’t burn out.00:06:56
There are electronics that protect the pump00:06:59
from overheating, then the pump will simply burn out,00:07:02
so be careful and treat00:07:04
this responsibly in more00:07:06
detail about this, I will tell a00:07:07
video about choosing a pump the next parameter00:07:11
that I need is the pressure in the empty00:07:13
hydraulic accumulator, the air pressure, as I00:07:16
said above, the pressure should be00:07:17
10 percent below 10 percent of 2.2,00:07:21
this is 0.2 bar. So from 2.2 I subtract 2 and00:07:25
get 2 bar. Now I00:07:28
have to substitute these values here into this formula Where00:07:31
in or V is the required value, that00:07:35
is, the same volume of the hydraulic accumulator00:07:37
that we need00:07:39
Q is the maximum water flow of the system in00:07:41
my case it is 25 liters per minute this00:07:45
figure is taken from the passport data of the00:07:46
pump And this is the number of hourly00:07:49
pump starts in my case is acceptable the00:07:52
pump can be turned on 20 times per hour;00:07:54
this parameter can be taken from the product data sheet;00:07:56
why is this so important? The fact is00:07:59
that the starting question, if it does not00:08:01
have a soft start system, is always00:08:03
twice as much as the power of the pump itself.00:08:05
This can be seen if you look at the00:08:08
light. During startup At the same time, the light of the electric motor00:08:09
sags a little. Well,00:08:11
it dims, in other words, due to the heavy00:08:13
load, when starting up, the pump windings00:08:15
heat up and in order for the windings00:08:18
to cool down, the pump needs to work00:08:19
for a while. By the way, the submersible pump00:08:22
is cooled by the same water that it00:08:24
pumps through itself, if00:08:25
it is planned to install too00:08:27
large a pump, then It’s better to take a closer look at a00:08:29
pump with a soft start. The fact is00:08:31
that in pumps with a soft start, the00:08:33
number of hourly starts is not00:08:35
regulated. If it is00:08:36
not possible to purchase such a pump, then00:08:38
you need to look for ways to reduce00:08:40
starting currents, since00:08:42
such pumps are not found in everyday conditions. There is no method for00:08:45
calculating a soft start. I’m here did not turn on00:08:47
If you open the product passport and do not00:08:49
find data there How many times per hour00:08:51
can this pump be started in this case it00:08:53
is necessary Call the manufacturer or00:08:55
official representative if this is00:08:57
not possible for some reason then you can00:08:59
use there is an approximate number of00:09:01
starts per hour acceptable for pumps from00:09:03
one and a half to two kilowatts no more than 2000:09:05
starts per hour for pumps from 700 to 150000:09:09
W about 30 starts per hour for pumps00:09:11
up to 700 Watt about 40 starts per hour this,00:09:15
of course, is all conditionally better.00:09:17
Find out a more accurate figure from the manufacturer. P200:09:20
is the pump shutdown pressure in in my00:09:22
case it is 3.2 bar P1 is the00:09:25
pump activation pressure in my case 2.2 P00:09:28
tank is the air pressure in an empty00:09:30
accumulator Remember that the00:09:32
pressure in the accumulator should be00:09:34
10 percent lower than the00:09:36
pump activation pressure in my case it is 200:09:38
bar of the last part of the formula I see00:09:40
some kind of unit, what kind of unit is it and00:09:42
where did it come from? The question is of course00:09:43
interesting; in short, this00:09:46
number follows from the isothermal00:09:48
law of Boyle-Marriott's law. Where in the00:09:51
law is absolute pressure calculated? And in00:09:53
technology it is relative, so00:09:55
we add 1 bar00:09:58
or one to the absolute pressure the atmosphere of the first part of the formula00:10:01
is the value 16.5 16.5 is a certain00:10:04
generalized coefficient for the convenience of00:10:06
calculations, I was unable to find the roots of the00:10:09
origin of this figure, the only00:10:11
thing I found out is that this is some kind of constant00:10:13
derived from some calculations by00:10:16
some Italian engineers00:10:18
that are used in international00:10:20
calculation method Uni00:10:22
9182 so let's take this figure as it00:10:26
is and use it now let's00:10:28
substitute all these values into00:10:30
our formula to begin with let's help the00:10:32
maximum pressure and minimum 3.200:10:34
multiply by 2.2 we get the value 70400:10:37
subtract the maximum pressure and00:10:40
minimum 3.2 -2 ,2 we get 1 Next, at00:10:43
the end of Formula 1, divide by 2 units of the00:10:46
isothermal process, divide by the00:10:48
pressure in the accumulator 2 bar in the00:10:50
first part of the formula, 25 liters per minute,00:10:53
divide by 20 starts per hour,00:10:56
we divide the resulting figure from the middle part of formula 704 by00:11:00
1, ultimately we get00:11:02
16.5, multiply by 1.25, multiply by 704,00:11:06
multiply by 0.5, we get 72 and 6 liters,00:11:10
getting the figure 72.6 liters. You need to choose a00:11:13
hydraulic accumulator of 80 liters if you change00:11:16
some numbers, for example, instead of a flow rate of00:11:18
25 liters per minute, I need a flow rate of00:11:20
80 liters per minute. Let's say for a minute I replaced the00:11:23
pump and added another small building to a three-story house00:11:26
and I00:11:28
needed this flow rate in this00:11:30
case, I divide the first part of the formula 80 liters00:11:33
per minute by 20, I get the value 4 and00:11:37
then I multiply the whole thing by everything00:11:39
else because everything else has00:11:41
n’t changed 16.5, he needs it by 4,00:11:43
multiply by 704, multiply by 0.5 and get00:11:47
232 liters, most likely there is no hydraulic accumulator00:11:50
for 250 liters, so either00:11:52
install one for 200, another for 50,00:11:54
or immediately install a00:11:56
hydraulic accumulator of 300 liters in size. As00:11:58
you can see calculating the minimum required00:12:00
hydraulic accumulator is not so difficult, but00:12:03
as you understand, such calculations, although00:12:05
close, cannot be00:12:06
absolutely accurate, firstly because a00:12:09
generalized coefficient of 16.5 is used,00:12:11
and secondly because a00:12:13
unit from the law of an isothermal00:12:16
process is used, it is also generalized and thirdly,00:12:19
because the consumption is never the00:12:20
same, it’s one thing if you’re just washing in the00:12:23
shower, and it’s a completely different matter if you’re00:12:25
washing in the shower and the washing machine is running at the same time and00:12:27
someone is watering00:12:29
the garden. These are completely two different00:12:31
values for consumption, absolutely this does00:12:33
n’t mean the fact that there is00:12:35
no need to calculate the hydraulic accumulator. If it turns out00:12:37
that you don’t have time to count, you don’t00:12:39
want to count, you don’t know how to count, then00:12:41
you can approach it in a very rough way00:12:43
by selecting the hydraulic accumulator according to the flow rate of00:12:46
the analysis points or according to the pump power;00:12:48
more correct, of course, according to the00:12:50
pump power if your pump up to 600 W00:12:53
then the tank is enough for 24 liters if 100000:12:57
watts then 50 if 15 100 liters up to 2.5 kW00:13:02
you will need a tank of 300 liters and00:13:05
once again I will add in conclusion the00:13:07
pump activation pressure you should have00:13:09
as low as low the00:13:11
pressure you want to get at the00:13:13
highest point of water intake, taking into account the00:13:15
height of your water intake point, let me00:13:18
remind you once again that for every 10 meters00:13:20
1 bar of pressure is lost, the pressure difference between00:13:23
turning on and off should be00:13:25
one or one and a half bars, the pressure in00:13:28
the accumulator should be 1000:13:29
percent lower than the pump turn-on pressure and the00:13:31
reserve the water in your hydraulic tank00:13:33
will be only 30 percent of its total00:13:35
volume for those who really want to00:13:37
learn how to calculate the hydraulic accumulator00:13:39
using this formula for you. There are two00:13:40
tasks in order to go to the tasks.00:13:43
You can click right here on the screen00:13:45
or follow the link in the video description00:13:47
to open a new one video I wish you00:13:49
success in selecting your00:13:50
hydraulic accumulator Artyom was with you so farDescription:
Я показываю, как рассчитать минимальный объём гидроаккумулятора, для систем водоснабжения. In this video I demonstrate how to estimate hydraulic accumulator minimum volume. Выбрать мембранный бак: https://www.stout.ru/catalog/baki-memb.../ To select diaphragm tank Сайт спонсора видео: https://www.stout.ru/ Video's sponsor site 0:42 Что такое гидроаккумулятор?/What is hydraulic accumulator? 1:03 Как правильно подобрать насос и автоматику / How to choose water pump and automation properly 2:10 Зачем рассчитывать гидроаккумулятор?/Why hydraulic accumulator should be estimated? 4:37 Какой перепад давления должен быть между включением и отключением насоса? /What differential pressure must be between pump сut-in and out? 4:53 Какое давление воздуха должно быть в Баке? / What air pressure must be in the tank? 5:30 Какое должно быть давление включения насоса? / What should be the cut-in pressure of the pump? 6:20 Какое должно быть давление отключения насоса? / What should be the cut-out pressure of the pump? 7:10 Давление в пустом гидроаккумуляторе / Pressure in the empty hydraulic accumulator 7:30 Формула и её "расшифровка" / Formula and its description 10:27 Подставляем значения и считаем результаты / We substitute the values and see the results 12:45 Второй (грубый) способ подбора гидроаккумулятора. / The second (coarse) method of selection of hydraulic accumulator. 13:05 Заключение / Conclusion Задачи по расчету гидроаккумулятора: https://www.youtube.com/watch?v=MOa1r... Hydraulic accumulator estimation task ********************************************************************* Платная консультация https://dobrotehnik.ru/ Пригласить специалиста: https://dretun.ru/call-sante/ Сайт о сантехнике по ссылке: https://dretun.ru/ * Группа вконтакте: https://vk.com/dobrosant Предложения о сотрудничестве: [email protected] * Инстаграм: https://www.facebook.com/unsupportedbrowser Страничка в контакте: https://vk.com/dobrotehnik Страничка в Фейсбук: facebook.com/dobrotehnik * Второй мой канал: https://www.youtube.com/c/Dobrotehnik * Поддержать проект: http://dretun.ru/oborudovanie-dlya-proekta/ Или Яндекс-деньги: 410011167363130 * Одноклассники: http://ok.ru/dretun/statuses Твиттер: https://twitter.com/Dretun
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