Calculation of the power of the boiler heating: expert

07-10-2018

Heating

When purchasing a heating boiler, the buyer faces the challenge of how much power the device should have. The fact is that not only the quality of the system’s work, but also its service life depends on this parameter. That is why the calculation of the power of the boiler heating area is performed at the design stage.

Amateur photo of a typical boiler attached to the system

Options for obtaining data and their need

To begin with, it is necessary to say that before such an indicator was found very simply. It was enough to divide the area of the room by ten and in the end we get the value in kW, which should be used as the nominal power of the product. However, modern installation instructions do not recommend using this approach, since the quality of buildings, their design and type of materials have changed dramatically in recent times.

To obtain the necessary data, first of all, you need to find out the area of all rooms in an apartment or house and have measurements of the ceiling height.

Necessity in calculations

First of all, accurate data will allow you to determine the specific type of device that is needed. You do not have to overpay for excess capacity or suffer because of its lack. The fact is that the price of the product directly depends on this parameter.

A table indicating the storage capacity at a certain heating time and using the appropriate heat storage tank

It is also necessary to mention that the device should work in its optimal mode.. If it is used less than 60%, this will greatly reduce the life of its parts, and condensate will appear in the chimney. Therefore, the question of how to calculate the power of the heating boiler requires a fairly accurate answer and validated data.

Table with typical parameters that are obtained when taking into account the height of the room up to three meters and the maximum consumption of gas fuel

Special attention should be paid to the fact that more powerful systems have expensive parts, and during preventive maintenance this will lead to unnecessary costs.. At the same time, the efficiency with incomplete use of equipment is greatly reduced, since it is designed to work with a specific volume. That is why the calculation of the heating capacity of the heating system is very important when choosing a domestic heating boiler for the house.

Tip! Some manufacturers immediately indicate on their products data that indicate the area of the room or its volume. However, all this is relatively relative and subject to verification.

Some manufacturers of such equipment create special software that allows the buyer to independently choose not only the product of the required power, but also specifically indicates the model

Calculations

If the calculation of the power of an electric heating boiler or heater is performed in a room with ceilings up to three meters high, then it is necessary to use a special formula: MK = S * CMP / 10

Where MK is the power of the boiler, S is the area of the room, and the CMB is the unit specific power. (See also the article Electric boiler for heating: features.)

It should be noted that the calculation of the power of the heating boiler as the last parameter involves the use of special values for certain regions of the country.

For example:

for the Moscow region, it will be 1.2 - 1.5 kW,
for the southern regions it is 0.7 - 0.9 kW,
for the middle band this parameter will be 1.0 - 1.2 kW,
but the northern regions should use data equal to 1.5 - 2.0 kW.

The formula for calculating all heat losses

If the height of the ceiling is much higher, then it is necessary to make additional calculations.

In this case, the calculation of heating power will be made with a margin of 15 - 20%.

To obtain the required value, you must first multiply the value of the stock, which will be equal to the number 1.15 or 1.20, by the data on the predicted losses.
To find out such losses it is necessary to make an additional calculation of the power of the heating system. To do this, multiply the difference between the external and internal temperature by the volume of the room, and then, the resulting value is multiplied by the insulation coefficient of the building and divided by 860.
This coefficient itself is taken from a special instruction. For example, for conventional structures made of wood or iron, it will be 3 or 4, and for a building with good thermal insulation, this number will be from 0.6 to 0.9.
However, it is worth noting that the finished data of this type cannot claim to be a full-fledged calculation of the power of a solid fuel boiler. The fact is that similar equipment for burning can use materials that give different heat. Therefore, try to use the average parameters of gas systems.

Tip! Considering the complexity of such calculations, it is better to use special software that is specially invented for this purpose.

There is a separate software to account for all heat loss.

Calculator

Most of the experts, telling how to calculate the power of the heating boiler, recommend using special software. It introduces a lot of different parameters, starting from the height of the ceiling and ending with the type of insulation, which means that the result will be as close as possible to reality. This is very important when designing large spaces or private homes.

It should be noted that even a person without experience can use a similar calculator with their own hands. The main thing is to have everything you need to enter data and strictly follow the instructions.

Tip! All available parameters must be converted to the values used by the calculator. If this is not done, then the end result will have inaccuracies.

The more unforeseen heat leaks or costs, the more the product’s efficiency decreases.

Conclusion

Having studied in more detail the video presented in this article, you can learn in more detail about such calculations and the necessary data. Also, taking into account the text above, it is worth concluding that sometimes it is better to use a special program than to make calculations yourself.