Gas consumption per square meter. Calculation of gas consumption for heating, or how much the “blue light” costs. Gas consumption for home heating

A natural or liquefied gas boiler is considered the most efficient, environmentally friendly, relatively inexpensive and quite convenient equipment for autonomous heating of apartments and country houses. Of course, all potential owners of gas boilers want to know what financial costs they need to prepare for, whether the chosen option will be cost-effective compared to other heating systems.

In this article:

How to measure consumption

Unfortunately, in most articles posted on the Internet, calculation examples do not give a clear answer to this question, and further confuse the average consumer.

The reason for this is the fact that such calculations are based on the gas boiler that it produces over a certain period of time.

Power is measured in kilowatts (kWh).

It is much clearer and more familiar to measure the consumption and cost of natural gas in cubic meters (cubic meters / h), and liquefied gas - in kilograms (kg / h). Knowing the gas consumption for a certain period of time and the current gas tariffs, you can easily calculate the approximate cost of heating your home.

Calculation methods with a good example

Boiler Zhukovsky AOGV

The amount of gas consumed for heating a house depends mainly on the characteristics of the gas boiler and its operating conditions.

Therefore, for calculations you will need to know:

technical parameters of the boiler;
its power and efficiency;
gas consumption indicated in the technical passport;
room area.

In our example, a gas boiler AOGV-17.4-3 (JSC Zhukovsky) with a capacity of 17.4 kW with an efficiency of 88% will participate.

Consumption of natural gas - 1.87 cubic meters / h, liquefied gas - 1.3 kg / h.

The boiler will heat up to 140 sq. meters of total floor space.

Wherein should be considered that the values indicated in the passport correspond to the continuous operation of the boiler at full power, and in fact the boiler operates 12-14 hours a day, so we will divide the calculated values by two.

Tariffs and fuel prices

We will conditionally accept the cost of the tariff for natural gas - 3.9 rubles. for 1 cubic meter.

The cost of filling a standard 50-liter cylinder with liquefied gas is 600 rubles. Such a cylinder is usually filled to 80% (42.5 liters), which is about 21 kg of propane-butane mixture.

Accordingly, the price of 1 kilogram of liquefied gas will be equal to 600 / 21 = 28.6 rubles (excluding the cost of transporting the cylinder to the gas station and back).

According to the passport data of the device

This is the simplest and most approximate calculation method.

For natural gas the flow rate is 1.87 cubic meters per hour, hence:

- daily consumption is 24 * 1.87 / 2 = 22.4 cubic meters at a cost of 22.4 * 3.9 = 87.5 rubles.

- per month (30 days): 22.4 * 30 = 672 cubic meters. at a cost of 672 * 3.9 \u003d 2,621 rubles.

- per year (7 months of the heating season): 7 * 672 = 4704 cubic meters at a cost of 4704 * 3.9 = 18,345 rubles.

For LPG the boiler flow rate is 1.3 kg/h, hence:

- daily consumption is 24 * 1.3 / 2 = 15.6 kg at a cost of 15.6 * 28.6 = 446 rubles.

- per month (30 days): 15.6 * 30 = 468 kg (22.3 gas cylinders) at a cost of 468 * 28.6 = 13,385 rubles.

- per year (7 months of the heating season): 7 * 468 = 3276 kg (156 gas cylinders) at a cost of 3276 * 28.6 = 93,694 rubles.

According to the specific heat of combustion of gas

The specific heat of combustion (calorific value) of gas depends on the type of natural fuel and the qualitative composition of the mixture. This value can be found in reference books on heat engineering.

For natural gas the lowest value of the specific heat of combustion is 34.02 MJ / m3 or 9.45 kW / h of thermal energy. With an efficiency of the device of 88%, this indicator will be adjusted to 9.5 * 0.88 = 8.3 kW / h.

How much does a gas boiler consume:

- 1/8.3=0.12 cubic meters of gas is consumed per hour (per 1 kW of the boiler output), and the total gas consumption in the heating boiler is 17.4*0.12=2.09 cubic meters.

- 24 * 2.09 / 2 = 25.1 cubic meters per day, at a cost of 25.1 * 3.9 = 97.9 rubles.

- per month (30 days) it turns out 25.1 * 30 \u003d 753 cubic meters, at a cost of 753 * 3.9 \u003d 2.937 rubles.

- per year (7 months of the heating season) the costs will be 7 * 753 = 5271 cubic meters, at a cost of 5271 * 3.9 = 20.557 rubles.

For LPG the specific heat of combustion is 50.38 MJ/kg or 13.99 kWh. With an efficiency of 88%, this figure will be adjusted to 13.99 * 0.88 = 12.3 kW / h.

Consumption of a boiler on liquefied gas:

- 1 / 12.3 * 17.4 \u003d 1.39 kg is consumed per hour.

- per day it turns out 24 * 1.39 / 2 \u003d 16.7 kg at a cost of 16.7 * 28.6 \u003d 477.6 rubles.

- per month (30 days): 16.7 * 30 = 501 kg (22.9 gas cylinders) at a cost of 501 * 28.6 = 14.329 rubles.

- per year (7 months of the heating season): 7 * 501 = 3507 kg (167 gas cylinders) at a cost of 3507 * 28.6 = 100.300 rubles.

Gas consumption is 20-25% more (add this difference to the final amount).

When comparing the results, it is noticeable that if we consider the specific heat of combustion of gas, then the costs and cost of heating are higher. This is because the minimum value of the specific heat of combustion is taken, which in fact can be higher.

In any case, the cost of heating with natural gas will cost about 5 times cheaper than heating a room with bottled gas. Nevertheless, liquefied fuel is still cheaper than autonomous electric heating.

At the same time, one should take into account the very possibility of connecting to a gas pipeline and the cost of such a connection, which is a fairly significant amount.

It is also worth noting that such calculations are very rough and approximate, since they do not take into account a number of circumstances that can significantly affect the final amount of expenses. In this case, the value of the calculations can vary significantly up or down.

An accurate calculation, taking into account all the circumstances, is best left to specialists in heat engineering.

How to cut costs

Additional factors affecting gas consumption when heating a house include:

the quality of the supplied fuel;
use of the second circuit of the boiler for heating water in the DHW system (gas consumption with intensive use of hot water increases by 20-25%);
outdoor air temperature;
features of the design and installation of the heating system;
the state of individual elements of the heating system during operation.

As well as the general heat loss of the house, depending on the degree of insulation of the walls, floor and ceiling, the number of windows and doors in the premises, their size and condition, the presence and design of the ventilation system and other technological openings with access to the outside.

How to reduce gas consumption and reduce heating costs:

buy a boiler with the highest possible efficiency (the higher cost of such a device pays off during its long-term operation);
use modern turbocharged or condensing boilers;
try to reduce heat loss at home due to its high-quality insulation;
use modern automation (thermostats, sensors,) that allow you to maintain and regulate the required level of temperature in the premises;
, which will reduce the operating time of the gas burner;
maintain the elements of the heating system in a timely manner (cleaning chimneys, bleeding air from radiators, etc.);
a slight decrease in the temperature in the premises (by 1-2 degrees), which is practically not noticeable to a person, in total will significantly reduce costs for the entire heating season.

Specified measures allow to reduce gas consumption up to 25-30% and more, which will significantly affect your financial spending down.

When arranging the heating system and choosing an energy carrier, it is important to find out the future gas consumption for heating a house of 150 m2 or another area. Indeed, in recent years, a clear upward trend in natural gas prices has been established, the last rise in price by about 8.5% occurred recently, on July 1, 2016. This led to a direct increase in heating costs in apartments and cottages with individual heat sources using blue fuel. That is why developers and homeowners who are just choosing a gas boiler for themselves should calculate heating costs in advance.

Initial data for calculations

To perform a preliminary calculation, you need to find out the following parameters:

the calorific value (calorific value) of natural gas supplied in your area;
The efficiency of the boiler, which is planned to be installed in a house or apartment.

The calorific value of the fuel is taken according to the value of the lower calorific value of the main gas.

Theoretically, when burning 1 m³ of blue fuel, 9.2 kW of thermal energy is released. In practice, this value differs and, as a rule, to a smaller extent. Due to the same rise in price, some unscrupulous suppliers dilute the gas with air, which can reduce its calorific value to 7.5-8 kW / m³.

To determine the gas consumption for heating a house, it is better to find out the calorie value from the management company, and when this fails, take into account the figure with a margin: 8 kW / m³. If they share information with you about the specific heat of combustion and give a figure expressed in other units, kcal / h, then you can convert it to Watts by multiplying by a factor of 1.163.

Another important indicator that directly affects fuel consumption is the heat load on the heating system, which consists of heat losses through the building structures of the building and losses for heating the ventilation air. The best option is to perform or order an accurate calculation of all heat losses, but in the absence of another way out, you can determine the load in enlarged ways:

If the ceiling height does not exceed 3 m, then a heat consumption of 0.1 kW per 1 m² of the heated building area is assumed. Thus, for a house of 100 m2, about 10 kW of heat is needed, 150 m2 - 15 kW and 200 m2 - 20 kW of heat energy.
Put 40-45 W of heat per 1 m³ of heated space. The load is determined by multiplying this value by the volume of all heated rooms.

The efficiency of the heat generator, which affects the efficiency of fuel combustion, is indicated in its technical passport. If the unit has not yet been purchased, then you can take the efficiency of gas boilers of various types from the list:

gas convectors - 86%;
boilers with an open combustion chamber - 88%;
heat generators with a closed chamber - 92%;
condensing boilers - 96%.

Performing calculations

Preliminary calculation of gas consumption for heating is made according to the formula:

V \u003d Q / (q x efficiency / 100).

q is the calorific value of the fuel, the default is 8 kW/m³;
V is the desired flow rate of the main gas, m³ / h;
Efficiency is the efficiency of fuel combustion by a heat source, expressed in %;
Q is the heating load of a private house, kW.

As an example, it is proposed to calculate the gas consumption in a small cottage with an area of 150 m² with a heating load of 15 kW. It is planned that the task of heating will be performed by a heating unit with a closed combustion chamber (92% efficiency). The theoretical fuel consumption for 1 hour in the coldest period will be:

During the day, the heat generator will consume 2.04 x 24 = 48.96 m³ (rounded - 49 cubic meters) of natural gas - this is the maximum consumption on the coldest days. But during the heating season, the temperature can fluctuate between 30-40 ° C (depending on the region of residence), so the average daily gas consumption will be half as much, about 25 cubic meters.

Then, on average per month, a turbocharged boiler uses 25 x 30 = 750 m³ of fuel to heat a house with an area of 150 m², located in central Russia. Consumption is calculated in the same way for cottages of other sizes. Focusing on a preliminary calculation, it is possible to carry out measures aimed at reducing consumption even at the construction stage: insulation, selection of more efficient equipment and the use of automatic controls.

Autonomous heating of private houses with liquefied propane or its mixture with butane has not yet lost its relevance in the Russian Federation, although in recent years it has noticeably increased in price. It is all the more important to calculate the future consumption of this type of fuel for those homeowners who plan such heating. The same formula is used for the calculation, only instead of the net calorific value of natural gas, the value of the parameter for propane is set: 12.5 kW with 1 kg of fuel. The efficiency of heat generators when burning propane remains unchanged.

Below is an example calculation for the same building of 150 m², only heated with liquefied fuel. Its consumption will be:

for 1 hour - 15 / (12.5 x 92 / 100) = 1.3 kg, per day - 31.2 kg;
on average per day - 31.2 / 2 \u003d 15.6 kg;
on average per month - 15.6 x 30 \u003d 468 kg.

When calculating the consumption of liquefied gas for heating a house, it must be taken into account that fuel is usually sold by volume measures: liters and cubic meters, and not by weight. This is how propane is measured when filling cylinders or a gas tank. This means that it is necessary to convert mass into volume, knowing that 1 liter of liquefied gas weighs about 0.53 kg. The result for this example will look like this:

468 / 0.53 \u003d 883 liters, or 0.88 m³, of propane will have to be burned on average per month for a building with an area of 150 m².

Given that the retail price of liquefied gas is an average of 16 rubles. for 1 liter, heating will result in a considerable amount, about 14 thousand rubles. per month for the same cottage for one and a half hundred squares. There is reason to think about how best to insulate the walls, and take other measures aimed at reducing gas consumption.

Many homeowners expect to use fuel not only for heating, but also for providing hot water. These are additional costs, they must be calculated, plus it is important to take into account the additional load on heating equipment.

The thermal power required for hot water supply is easy to calculate. It is necessary to determine the required amount of water per day and use the formula:

Q DHW \u003d cm (t 2 - t 1).

c is the heat capacity of water, equal to 4.187 kJ/kg °C;
t 1 - initial water temperature, ° С;
t 2 - final temperature of heated water, ° С;
m is the amount of water consumed, kg.

As a rule, economical heating occurs up to a temperature of 55 ° C, and this must be substituted into the formula. The initial temperature is different and lies in the range of 4-10 °C. For a day, a family of 4 people needs approximately 80-100 liters for all needs, subject to economical use. It is not necessary to convert the volume into mass measures, since in the case of water they are almost the same (1 kg \u003d 1 l). It remains to substitute the obtained value of Q DHW in the above formula and determine the additional gas consumption for DHW.

During the design of a gas heating system, all factors affecting gas consumption are taken into account: the size of housing, the number of floors, the insulation of the main structures, the power and how many people live in this house. Heating a private house with gas is beneficial from an economic point of view for several reasons.

Benefits of use

First, it has a high efficiency of the combustion process due to the low sulfur content. This also saves resources for cleaning the boiler. Secondly, it is easy to reduce heat loss and gas consumption with good thermal insulation. Thirdly, gas is also an environmentally friendly material, since when it is burned, a very small amount of harmful substances enters the atmosphere.

When gas is used as a fuel for heating, the walls of the boiler do not suffer from corrosion, which increases the life of the equipment. The use of liquefied gas is convenient: it has better quality and is delivered in cylinders to places where there are no highways, making life easier for thousands of people.

Complexity and features of costs

Gas consumption for heating a house is directly proportional to the living area of the premises. You can calculate the consumption in kW / hours by multiplying the boiler power by the number of hours / day and days / month.

However, this mode is practically not used for everyday life. The real indicator for calculating gas consumption is the value of the average monthly indicator of KW / h. To do this, the maximum amount of consumption for heating the house per month is divided in half. If this is a residential building, then the calculation is made based on the length of the heating season.

Algorithm

The data for calculating the power of the boiler are based on the ratio of 1 kW / h per room of 10 m². Thus, to heat a house with an area of 100 m², you will need to divide it by 10: i.e. the required power will be 10 kW / h.
How much gas is spent on a different size of a house is calculated according to the same principle, i.e. the area is divided by 10. For example, for an area of 200 m2, the calculation will look like this: 200 m2 / 10, i.e. 20 kW / h will be spent on heating this room.

Adjustment for days

Monthly gas consumption is calculated by multiplying the daily requirement of a house of 100 m2 by the number of days in a month: 10 kWh * 24 hours * 30 days (total - 7200 kW). Since the system usually operates in medium mode, the maximum flow is divided in half, and 3600 kW is obtained.

Seasonal adjustment

If the duration of the heating season is 7 months, then the calculation of gas costs is obtained by multiplying 3600 kW by 7. I.e. heating a private house with an area of 100 m² will cost 25,200 kW. Heating a house of 200 m2 will require 50,400 kW, respectively.

If the heating season is shorter or longer than 7 months, then the gas consumption is calculated accordingly by multiplying by the period required by the user.

Knowing the tariff for 1 kWh, it is very easy to calculate the monetary equivalent of consumption. The cost of 1 kWh may vary depending on the region.

Nuances and additional factors

There are special programs for calculating fuel consumption that will greatly facilitate the work. For apartment buildings that are connected to the main gas supply, the norms of its consumption are established.

Despite the available techniques, for a more accurate result, it is still recommended to contact specialists. After all, the calculation of the need for a gas boiler takes into account the use of fuel only for heating the house.

But you also need to remember about the presence of a gas stove, a system for heating water, which will increase your costs. For the consumption indicator, the number of people living in a house or apartment is also important. All these factors will be taken into account by specialists.

In addition, the masters will help to minimize gas consumption through the use of special technologies.

Features of autonomy

If there is no gas main near a residential or country house, then an autonomous heating system that runs on a mixture of propane and butane becomes an excellent solution.

The cost of purchasing and installing autonomous heating equipment that uses a mixture of propane and butane as fuel is lower than the cost of connecting to a central gas pipeline.

pros

Such a system reduces the risk of emergency shutdown of lines, the threat of a sudden drop in pressure. Autonomous heating has tanks that support the possibility of gas consumption for heating for some time.

In the event of a power outage or fuel supply, the security system that all boilers are equipped with blocks the solenoid valve. After the restoration of gas supply, you need to start it again.

Saving Tips

Reducing gas consumption for heating can be achieved in the following ways:

installation of an automatic control system;
installation of gas sensors, which will also help to detect a leak in time;
house insulation: wall cladding, roofing;
compliance with the temperature regime in the room with cylinders not lower than 25 ° C;
purchasing cylinders from a trusted supplier, as poor fuel quality also reduces efficiency.

These measures make it possible to reduce gas consumption by up to 40%, which makes it possible to use 1 cylinder for 3-4 days.

Heating on liquefied gas is more expensive than connecting a home to a main pipeline. However, "blue fuel" has been and remains the cheapest source of energy for heating systems in residential and industrial buildings. Moreover, the expediency of using its liquefied or natural version can be determined only after calculating the gas consumption for heating the house. This is what we will do.

How to calculate the need for thermal energy

The simplified formula for such a calculation looks very simple - 1 kW of thermal energy is spent on heating 10 m 2 of the building area. A more accurate formula operates not with areas, but with the cubic capacity of the house, taking into account also the height of the ceilings in the room. But for dwellings of a standard type with a ceiling height of 2.5-2.7 meters, the above simplified proportion is valid. An accurate calculation of the need for thermal energy operates not only with the volume of heated space, but also with the heat resistance of walls, openings and ceilings. In addition, in this case, the average annual temperature and other nuances are taken into account.

However, in order to calculate the volume of fuel, a simple formula will be enough for us: 1 kilowatt = 10 square meters. As a result, it is necessary to spend 15 or 20 kW, respectively, to heat a building with an area of 150 or 200 "squares". And that's just an hour. But the boiler does not consume gas every minute. The period of work / idle time is divided here in the proportion of 50/50 percent. Therefore, a house of 150 square meters will spend 180 kW (15x24 / 2) per day, and a dwelling with an area of two hundred square meters - 240 kW.

The cold season in our latitudes lasts from October to April - 7 months or 210 days. Therefore, the annual consumption of thermal energy will be 37,800 and 50,400 kW. We will focus on these values in our further calculations.

How much heat is given off by liquefied or natural gas

We already know the annual consumption of the heating system. Now we must calculate the calorific value of the energy source itself - liquefied and natural gas. Using these values, we will be able to reach the amount of substance burned in the furnace of a gas boiler per year.

Calorific value is the ratio of the amount of kilowatts of energy released during the oxidation of fuel to a unit of mass or volume. Since we are interested in the main (natural) or liquefied gas used for heating a house as an energy source, then, as a measure of a substance, we will operate in cubic meters or liters. According to tabular data, the calorific value of natural gas is 33.5 MJ / m 3 or 9.3 kW / m 3 (a coefficient of 1 kW = 3.6 MJ is used for conversion). That is, when a cube of gas is burned, 9.3 kW of thermal energy is released.

LPG is a mixture of propane, ethylene and other combustible carbohydrates. And it is more "caloric" than dietary natural fuel. According to tabular data, the calorific value of a kilogram of such a substance is 45.20 MJ or 12.5 kW. But the generally accepted "unit" of liquefied fuel is liters, and its density is 0.524 kg / l. Therefore, we can say that during the combustion of a liter of liquefied mixture, 6.55 kW of thermal energy is released.

Calculation of the amount of fuel for heating a house

So, above in the text, we found that 9.3 or 6.55 kW of thermal energy are released from a cubic meter or liter of natural or liquefied gas, respectively. And this means that to generate 37,800 and 50,400 kW (costs for the cold season for houses of 150 and 200 squares), we need:

4064 and 5419 cubic meters of natural gas (37800/9.3 and so on).
5771 and 7695 liters of liquefied fuel (37800 / 6.55 and so on).

For accuracy, we must add 10% to these values, since the efficiency of a gas boiler is 90 percent (a tenth of the gas combustion energy is wasted). As a result, we see the following picture:

Estimated gas consumption for heating a house with an area of 150 m 2 - 4471 m 3 or 6348 liters.
The approximate fuel consumption for heating a building for two hundred squares is 5960 m 3 or 8464 liters.

The specified gas consumption is calculated for the entire cold season - seven months, from the beginning of October to the end of April. Therefore, in a warm year, you are likely to spend less gas than we calculated. However, even these results allow us to determine what is more profitable - natural or liquefied fuel.

Which gas to choose - which is more profitable?

To connect to the main gas pipeline, the user will have to pay for the project and installation work. And these expenses cannot be called insignificant. Growing appetites of gas services make gasification of dwellings a very costly undertaking. However, all these expenses pay off during operation. As of March 2017, the cost of a cubic meter of gas, depending on the region of the Russian Federation, ranges from 4.44 to 8.66 rubles. The average price is 6.55 rubles. As a result, natural gas heating of a house of 150 or two hundred square meters, taking into account the estimated consumption rate for the season, will cost 29,825 and 39,038 rubles.

Liquefied fuel does not require a tie-in to the main, but for its storage it is necessary to build a gas tank - a container that receives the required amount of fuel. In addition, this container will have to be periodically filled with gas, which is delivered to the site using special vehicles, and this service is not cheap. And the gas tank will have to be repaired and maintained. After all, the safety of all residents of a house heated by liquefied gas depends on its condition.

At the beginning of spring 2017, a liter of liquefied gas at gas stations cost from 11 to 20 rubles, depending on the region of the Russian Federation. The average cost of this fuel was 15.5 rubles. Therefore, heating a house with liquefied gas for 150 square meters will cost 98,394 rubles. For housing with an area of two hundred square meters, you will have to pay even more - 131,192 rubles. As you can see, liquefied fuel has overtaken natural gas by 3.3 times. Therefore, the conclusions about profitable / unprofitable suggest themselves - natural (main) gas, with all the bureaucracy and complexity of the connection process, will be much more profitable than liquefied fuel.

How to reduce fuel consumption for a private house owner

The amounts mentioned above can stun an impressionable tenant or an ordinary citizen. Well, what can you do - "your home" was an expensive pleasure at all times. However, unlike a city dweller living in an apartment, the owner of private housing can change heating costs in his favor.

To do this, he will need to do the following:

To insulate the facade, foundation, roof, attic and basement ceilings - even a thin layer of thermally insulating material can win back at least a couple of thousand, or even a whole dozen, from the gas bill.
Replacing old windows with modern double-glazed windows, putting a heat-resistant canvas in the doorway - this is another 5-10 thousand minus. Moreover, it is worth taking up doors and windows in the first place, since they generate at least 40 percent of heat losses.
Put a heat accumulator in the basement or boiler room, change the wiring diagram to a double-circuit or collector version, which provides the possibility of spot thermoregulation of radiators, purchase a boiler with high efficiency. Now on sale there are excellent 95 percent devices. In this case, savings can be up to 10-15 percent of the total bill.

In a word, it is necessary, firstly, to increase the heat resistance of the house, and secondly, to use more energy-efficient equipment. And no one is forcing you to make these changes in one season. You can start with windows, then upgrade the cauldron and get close to walls and ceilings. As a result, you can save up to a quarter of the announced costs.

Despite the clear leadership of gas boilers in terms of fuel costs, large payments can also come when using it. To avoid this, it is required to carry out careful calculations of gas consumption for heating a private house. To find out the energy efficiency of the entire system, you need data about ...

Most often, we think about how much fuel we have used when we receive bills for the received heat. And if the amount is frighteningly large, we begin to carry out calculations. There are methods that allow, both at the design stage and in an equipped building, to calculate, for example, the gas consumption for heating a house of 200 m 2. The results obtained will help to audit the heating system and develop methods to reduce the cost of maintaining a comfortable microclimate in the house.

Gas … and other gas

Blue fuel has been the most popular and cheapest energy source for many years. Most often, two types of gas are used for heating and, accordingly, two connection methods:

Trunk. It is pure methane with a trace amount of fragrance added to make leak detection easier. Such gas is transported through gas transmission systems to consumers.

Liquefied mixture propane with butane, which is pumped into the gas tank and provides independent heating. When this liquid changes to a gaseous state, the pressure in the tank increases. Under the action of high pressure, the gas mixture rises through pipes to the point of consumption.

Both types have their pros and cons:

there is always a risk of pipeline breakage during main connection, pressure reduction in him. The gas holder gives complete autonomy, it is only necessary to monitor the presence of gas;

gas tank equipment and its maintenance costly. But this is the only possibility of gas heating if there is no mains in the vicinity;

to calculate the gas consumption for heating a house of 100 sq m, perform fuel calorie comparison from the line and the liquefied mixture in the cylinder. The calorie content of the propane-butane mixture is three times greater than that of methane: when burning 1 m 3 of the mixture, 28 kW is released, and the combustion of the same amount of methane produces 9 kW. Accordingly, the amount of heating of the same area will be spent differently.

A liquefied mixture is often pumped into small-capacity cylinders for autonomous heating.

For autonomous heating, liquefied gas in cylinders is also used.

What increases gas consumption

Gas consumption for heating, except for its type, depends on such factors.:

climatic peculiarities terrain. The calculation is carried out for the lowest temperature indicators characteristic of these geographic coordinates;

Square the whole building, its number of floors, the height of the rooms;

Type and availability insulation roofs, walls, floors;

View buildings (brick, wood, stone, etc.);

Profile type on the windows, the presence of double-glazed windows;

Organization ventilation;

Power in the limit values of heating equipment.

Equally important is the year the house was built, the location of the heating radiators.

Calculation of main gas consumption

The calculation of the required power is carried out on the assumption that the height of the rooms does not exceed 3 m, its area is 150 m 2, the condition of the building is satisfactory, there is insulation. Then, for heating 10 m 2 of an area, on average, 1 kW of energy is consumed at a temperature lower than -10 0 C. Since this temperature lasts on average only half of the heating season, we can take 50 W * m / h as a base value.

Gas consumption for heating a house of 150 m2 will be determined by the ratio

A \u003d Q / q * ɳ

Q in the selected example, it is calculated as 150*50 = 7.5 kW and is the required power needed to heat this room.

q is responsible for the brand of gas and provides specific heat. For example, q = 9.45 kW (gas G 20).

ɳ shows the efficiency of the boiler, expressed in relation to the unit. If efficiency = 95% then ɳ = 0.95.

Let's perform the calculations, we get that the gas consumption for a house with an area of 150 m 2 will be equal to 0.836 m 3 per hour, for a house with a size of 100 m 2 - 0.57 m 3 per hour. To obtain the average daily amount, the result is multiplied by 24, for the average monthly it is multiplied by another 30.

If you change the efficiency of the boiler by 85% per hour, 0.93 m 3 will be consumed.

Calculation of the amount of liquefied gas

The formula A = Q / q * ɳ can be used to determine the amount of various fuels. Since liquefied gas is either in a gas tank or in cylinders, the volume of their capacity is measured in m 3, therefore, the consumption of liquefied fuel is calculated in these units.

The table shows the cost of autonomous gasification

When calculating the consumption of liquefied gas for heating a house of 200 m 2, take into account such indicators:

density mixtures of propane and butane. For example, for type G 30 ρ = 0.524 kg/l;

specific calorific value. For G 30, it is 45.2 MJ / kg (23.68 MJ / l) or 6.58 kW / l.

Average values can be taken from the first example, given that Q = 200 * 50 = 10 kW

A \u003d 10 / (6.58 * 0.95) \u003d 1.6 l / h

The average daily consumption will be equal to 1.6 * 24 = 38.4 (l)

Provided that a cylinder with a capacity of 50 liters is used, but filled up to 42 liters for safety reasons, it can be argued that it will last for about a little more than a day.

The average monthly gas consumption will be 38.4 * 30 = 1152 liters. And this is already 27.5 cylinders (1152/42 = 27.5).

Similar calculations can be made in order to determine the gas consumption for heating a house of 100 m 2 from a gas tank. Its quantity will also be determined in liters.

A \u003d 5 / (6.58 * 0.95) \u003d 0.8 l / h

During the day, the gas tank will empty by 19.2 liters, and in a month - by 576 liters, for the heating season of 7 months - by 4032 liters. This must be taken into account in order to replenish the container in a timely manner.

Refueling of the gas tank is carried out by special machines

How much does heating cost

The amount of heating depends on the amount of gas consumed and the price per 1 m3 in the region. By simply multiplying two numbers, you can determine the costs per day, per month, or for the entire heating season.

From the point of view of the absolute price per m 3 (kg), main methane is 3-4 times cheaper than propane-butane mixture. However, when comparing the cost of heating a building in 100 m 2 of methane, an average of about 3000 m 3 is needed, and only 1000 m 3 of a liquefied mixture. Therefore, it can be argued that how much liquefied gas costs for heating a house is the same price as the main one, due to the higher consumption.

Video description

About the nuances of heating a house from a gas tank and pricing, clearly in the video:

How to pay less

Since it will not be possible to significantly win in the price of an autonomous heating installation, it means that it is necessary to turn to energy-saving technologies.

Carry out a thorough warming not only the walls of the building, but also the roof, floor, foundation, even the basement, if any.

Replace double-glazed windows for energy-saving, the profile is frost-proof.

Install the boiler with maximum efficiency and electronic thermostat.

Check the state of the thermal insulation of the house on the thermal imager for the correction of cold points and their elimination.

Change ventilation and air conditioning system. Just an open window or a window set for ventilation takes more heat than a window open for 5-7 minutes and a complete replacement of the air in the room.

Arrange warm floor, especially in the hallways, hallways.

Install on radiators electronic sensors, to block heating above the set temperature.

It is very efficient to use the "smart home" system, which will reduce gas consumption by at least 25%. If you follow all the advice, the house will be warm and comfortable, and gas bills will not cause horror.

The smart home system is easier and more comfortable to control with a remote control

On our website you can find contacts of construction companies that offer the service. You can directly communicate with representatives by visiting the exhibition of houses "Low-Rise Country".

Conclusion

If the house is being built according to a well-designed project, then what gas consumption will be during the heating season can be imagined in advance. If the calculations are made for an existing house, in order to insulate it, then the best way out would also be to turn to professionals who will not only mechanically do their job, but will also be able to advise something.