Competent choice of the boiler will allow you to maintain a comfortable air temperature in the room during the winter season. A large selection of devices allows you to most accurately select the desired model, depending on the required parameters. But in order to ensure that the house is warm and at the same time to prevent unnecessary costs of resources, you need to know how to calculate the power of the gas boiler for heating a private house.
The capacity of the boiler is the main characteristic, however, the calculation can be carried out using different formulas, depending on the configuration of the device and other parameters. For example, with a detailed calculation can take into account the height of the building, its energy efficiency.
Boilers can be divided into two types depending on the application:
Single-circuit - are used only for heating;
Dual-circuit - used for heating, as well as in hot water systems.
Units with a single circuit have a simple structure, consist of a burner and a single heat exchanger.
In dual-circuit systems, the function of heating water is primarily provided. When using hot water, heating is automatically turned off while hot water is being used, so that the system does not overload. The advantage of the two-loop system is its compactness. Such a heating complex takes up much less space than if the hot water supply and heating systems were used separately.
Often, boiler models are divided by placement method.
It is possible to install boilers depending on their type in different ways. You can choose a model with a wall mount or mounted on the floor. It all depends on the preferences of the owner of the house, capacity and functionality of the room in which the boiler will be located. The way to install the boiler also affects its capacity. For example, floor boilers have more power than wall models.
In addition to the fundamental differences in the purpose of use and methods of placement, gas boilers also differ in control methods. There are models with electronic and mechanical control. Electronic systems can only work in homes with constant access to the power grid.
On our site you can find contacts of construction companies that offer home insulation services. Directly to communicate with representatives, you can visit the exhibition of houses "Low-rise Country".
There is no single algorithm for calculating both single and double-circuit boilers - each of the systems must be selected separately.
When calculating the required power for heating a house built according to a standard design, that is, with a height of rooms no more than 3 meters, the volume of rooms is not taken into account, and the power indicator is calculated as follows:
Determine the specific thermal power: Mw = 1 kW / 10 m ^{ 2 };
Next, calculate the required power for heating houses.
Pm = Um * P * Kp, where
P is a value equal to the sum of the areas of heated premises,
Kp - correction factor, which is taken in accordance with the climatic zone in which the building is located.
Some coefficient values for different regions of Russia:
Southern - 0.9;
Located in the middle lane - 1 , 2;
Northern - 2.0.
For the Moscow Region, a coefficient value of 1.5 is taken.
This method does not reflect the main factors affecting the microclimate in the house, and only approximately shows how to calculate the power of a gas boiler for a private house.
Example of calculation for a single-circuit device installed in a room with an area of 100 m ^{ 2 }, located on the territory of the Moscow Region:
Pm = 1/10 * 100 * 1.5 = 15 (kW)
Dual-circuit instruments have the following principle of operation. For heating, water is heated and supplied through the heating system to radiators, which give off heat to the environment, thus heating the rooms and cooling. When cooled, the water comes back to heat. Thus, the water circulates along the contour of the heating system, and passes cycles of heating and transfer to the radiators.At the moment when the ambient temperature becomes equal to the set point, the boiler switches to standby mode for some time, i.e., it temporarily stops heating the water, and then starts heating again.
For domestic needs, the boiler heats the water and supplies it to the faucets, and not to the heating system.
When calculating the power of an instrument with two circuits, usually another 20% of the calculated value is added to the received power.
Example of calculation for a dual-circuit device that is installed in a room with an area of 100m ^{ 2 }; the coefficient is taken for the Moscow region:
P _{ m } = 1/10 * 100 * 1.5 = 15 (kW)
P _{ total } = 15 + 15 * 20% = 18 (kW)
It might be interesting! In the article next link read about installing a gas boiler in a private house.
In construction there is also the concept of energy efficiency of the building, that is, how much the building gives heat to the environment.
One of the indicators of heat transfer is the dispersion coefficient (Kp). This value is constant, that is, constant and does not change when calculating the level of heat exchange of structures made of the same materials.
For calculations, the coefficient is taken, which depends on the building can be equal to different values and the application of which will help to understand how to calculate the power of a gas boiler for a house more precisely:
The lowest level of heat exchange corresponding to the value K _{ p } from 0 , 6 to 0.9, assigned to buildings made of modern materials, with flooring, walls and roof;
K _{ p } is equal to 1.0 to 1 , 9 if exterior walls are built insulated, heat insulation of the roof was carried out;
К _{ p } is from 2.0 to 2.9 in houses without insulation, for example, brick ones with single masonry;
К _{ p } is equal to from 3.0 to 4.0 in non-insulated rooms in which there is a low level of thermal insulation.
Heat loss level Q _{ t } is calculated according to the formula:
Q _{ t } = V * P _{ t } * k / 860, where
V - is the volume of the room,
P _{ t } - p is the temperature difference, calculated by subtracting the minimum possible air temperature in region of the desired room temperature,
to - the safety factor.
When calculating the dispersion coefficient, the boiler power is calculated by multiplying the calculated level of heat loss by the safety factor (usually from 15% up to 20%, then it is necessary to multiply by 1.15 and 1.20, respectively)
This method allows you to more accurately determine the performance and, therefore, the most qualitative approach to the choice of the boiler.
It’s worth choosing a boiler to match the power required to heat a building. This will be the best option, because buying a boiler that is inappropriate in terms of power levels can lead to two types of problems:
The low-power boiler will always work to the limit, trying to heat the room to the set temperature , and can quickly fail;
A device with an excessively high power level is more expensive and even consumes more gas in economy mode than a less powerful device.
Those who do not like to do calculations, even if they are not very complicated, will help to calculate the boiler for home heating, a special calculator is free online application.
As a rule, the calculation service requires you to fill in all the fields, which will help you to make the calculations most accurately , including the power of the device and the insulation of the house.
To obtain a final result, you will also need to enter the total area that will require heating.
Next, fill in the information about the type of glazing, the level of insulation of walls, floors and ceilings. As additional parameters, the height at which the ceiling is located in the room is also taken into account; information on the number of walls interacting with the street is entered. Take into account the height of the building, the presence of buildings on top of the house.
After entering the required fields, the button for performing calculations becomes "active" and you can get a calculation by clicking the corresponding button. To verify the information received, you can use the calculation formulas.
You can clearly see the calculation of the power of the gas boiler in the video:
Gas equipment has several advantages and deficiencies. The advantages include:
the possibility of partial automation of the boiler operation process;
unlike other energy sources, natural gas has a low cost;
devices do not require frequent maintenance.
The disadvantages of gas systems include the high explosiveness of gas, but with proper storage of gas cylinders and timely maintenance, this risk is minimal.
On our website you can familiarize yourself with construction companies that offer services for connecting electrical and gas equipment. Directly with representatives, you can chat at the exhibition of houses "Low-rise Country".
Despite the seeming simplicity of the calculations, we must remember that gas equipment must be selected and installed by professionals. In this case, you will get a trouble-free device that will work properly for many years.