Despite the fact that advanced technologies for space heating are now common, the heating system with natural circulation is in great demand. This is primarily due to the fact that it is easy to install, and if you also take into account the instability of providing the private sector with electricity, then the popularity of such an autonomous heating system becomes clear.
Scheme of the gravitational heating system
Immediately it should be said thanks to a special device, the system works without forced circulation of the coolant. The movement of water in the pipes occurs due to the fact that when cooled, the density of water increases, and it flows down to the boiler through pipes installed on an incline, pushing out heated water from it.
Although a natural circulation heating system can work without a pump, it is still better to install it. When the pump is turned on, the coolant flows faster through the pipes, therefore, the room warms up faster.
When leaving the boiler, the water enters the accelerating collector, reaches the top point through it, and through pipes installed at an incline from the boiler, while cooling, continues its way around.
We have to wait a long time
First, let's talk about the disadvantages. Such an approach will help determine whether such a heating system will suit you.
As already mentioned, in the gravity heating system there should be no height differences, otherwise it simply will not work. For this reason several contours can be made.
Connection circuit with natural circulation
Everything is very clear here - one pipe goes from the boiler and the other goes to it, and batteries are connected between them. The presented scheme will help to understand this.
A single-circuit system can be a single-pipe one, only in this case it is necessary to take into account the factor that each successive battery in the self-flowing system will be more sensitively cooler than the previous one.
Dual-circuit systems may differ in direction coolant movement:
The choice of pipe mounting method taking into account the direction of coolant movement mainly depends on where the doors are located in the room or there are other nuances due to which the installation of the return in this place is impossible.
Regardless of the system selected, the pitch angle of the pipes does not change.
How to calculate the power of the radiator
There is no need to talk about exact results, since each house is individual and may differ in many parameters, which cannot be taken into account in the general scheme, and there is no need for that. Under ideal conditions, it is considered that for heating 1 m 2 60 W of radiator power is sufficient. It is quite clear that if the house is not insulated, simple wooden windows are installed in it, then it will be necessary to install more powerful batteries.
In order not to deal with the alteration later, it is important at the planning stage to find out what should be the capacity of the battery (or batteries) to be installed in a particular room. To do this, you can use one of two methods.
More accurate data can be obtained, given the volume of the room. We carry out measurements and, having received data on height, width and length of the room, we multiply them together, and multiply the result by 40 watts. Given the peculiarities of the structure, we introduce a correction factor.For:
It is important to consider the number of doors and windows.
By calculating the number of batteries by the area of the room, the average indicator is used - 1 kW per 10 m 2 . By the same principle, the power of the heating boiler purchased for the house is calculated.
Consider an example of how to make calculations.
Now we will make amendments on climate zones. Consider the coefficients:
In our example, a 7.2 kW boiler was required. Taking into account the coefficient, we will calculate the final data for the Middle Band:
The power of the battery is indicated in the passport of the product. If you are not sure of the correctness of your calculations, then purchase a more powerful radiator by installing a thermostat on it.
Installation of the self-flowing system
Expansion Tank for the House Heating System
When planning the production of a gravity system in a two-story house, you need to take into account that the coolant is supplied to the second floor, and then it goes down to the radiators installed on the first floor along the risers.
It remains to fill the system with water, and, checking it for leaks, heat the room without worrying that they can turn off the electricity.
Watch a video on how to perform a heating calculation with natural circulation:
This video shows an example of heating with natural circulation: