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 private houses. Of course, all potential owners of gas boilers want to know what financial costs they need to prepare for and whether the chosen option will be cost-effective compared to other heating systems.
In this article:
How to measure flow
Unfortunately, in most articles posted on the Internet, calculation examples do not provide 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 (kW/h).
It is much clearer and more common to measure the consumption and cost of natural gas in cubic meters (cubic m/h), and liquefied gas in kilograms (kg/hour). 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 illustrative example
Boiler Zhukovsky AOGV
The amount of gas spent on 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 specified in the technical passport;
- room area.
Our example will involve a gas boiler AOGV-17.4-3 (JSC Zhukovsky) with a capacity of 17.4 kW with an efficiency of 88%.
Natural gas consumption – 1.87 cubic meters/h, liquefied gas – 1.3 kg/h.
The boiler will heat up to 140 sq. meters of total premises area.
Wherein should be considered that the values indicated in the passport correspond to continuous operation of the boiler at full power, but in fact the boiler operates 12-14 hours a day, so we will divide the calculated values by two.
Tariffs and fuel prices
Let’s assume that the cost of the natural gas tariff is 3.9 rubles. for 1 cubic meter.
The cost of refilling a standard 50-liter cylinder with liquefied gas is 600 rubles. Such a cylinder is usually filled to 80% (42.5 l), 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 device data sheet
This is the simplest and most approximate method of calculation.
For natural gas the consumption is 1.87 cubic meters/h, hence:
- daily consumption is 24*1.87/2=22.4 cubic meters with 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=2,621 rubles.
— for a year (7 months of the heating season): 7*672=4704 cubic meters at a cost of 4704*3.9=18,345 rubles.
For liquefied gas The boiler consumption 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.
— for a 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 quality of the mixture. This value can be found in reference books on heating engineering.
For natural gas the lowest value of the specific heat of combustion is 34.02 MJ/cub.m or 9.45 kW/h of thermal energy. With a device efficiency of 88%, this figure 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 are consumed per hour (per 1 kW of boiler output power), and the total gas consumption in the heating boiler is 17.4 * 0.12 = 2.09 cubic meters.
— per day comes out to 24 * 2.09/2 = 25.1 cubic meters, with a cost of 25.1 * 3.9 = 97.9 rubles.
- per month (30 days) it turns out 25.1 * 30 = 753 cubic meters, with a cost of 753 * 3.9 = 2.937 rubles.
— per year (7 months of the heating season) costs will be 7*753=5271 cubic meters, with a cost of 5271*3.9=20.557 rubles.
For liquefied gas the specific heat of combustion is 50.38 MJ/kg or 13.99 kW/h. With an efficiency of 88%, this figure will be adjusted to 13.99*0.88=12.3 kW/h.
LPG boiler consumption:
— 1/12.3*17.4=1.39 kg is consumed per hour.
— per day it turns out 24 * 1.39/2 = 16.7 kg at a cost of 16.7 * 28.6 = 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 calculate by the specific heat of combustion of gas, then the costs and cost of heating are higher. This happens because the minimum value of the specific heat of combustion is taken, which in fact may be higher.
In any case, the cost of heating with natural gas will be approximately 5 times cheaper than heating a room with bottled gas. However, liquefied fuel is still cheaper than autonomous electric heating.
At the same time, one should take into account the possibility of connecting to the gas pipeline and the cost of such a connection, which amounts to 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 influence the final amount of expenses. In this case, the amount of calculations can vary significantly up or down.
It is best to entrust an accurate calculation, taking into account all the circumstances, to heating engineering specialists.
How to cut costs
Additional factors affecting gas consumption when heating a home include:
- quality of supplied fuel;
- using the second circuit of the boiler to heat water in the domestic hot water system (gas consumption with intensive use of hot water increases by 20-25%);
- outside air temperature;
- features of the design and installation of the heating system;
- condition 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 rooms, 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 (temperature regulators, sensors, etc.) that allow you to maintain and regulate the required temperature level in the rooms;
- , which will reduce the operating time of the gas burner;
- Maintain heating system elements in a timely manner (cleaning chimneys, bleeding air from radiators, etc.);
- A slight decrease in indoor temperature (by 1-2 degrees), practically unnoticeable to humans, will in total significantly reduce costs for the entire heating season.
These measures allow you to reduce gas consumption by up to 25-30% or more, which will significantly reduce your financial expenses.
Gas installations for heating a home are beneficial in terms of savings. In addition, the automatic heating process almost completely eliminates the use of human labor. The overall benefit from using gas is calculated individually.
For example, gas consumption for heating a house of 150 m2 depends on the power indicators of the equipment. The higher the power, the higher the fuel consumption. The total amount of gas consumption can be calculated by multiplying the power of the equipment by 720 (average). Remember that the data obtained is approximately correct, because the time of use directly depends on the temperature, latitude zone, and insulation of the house.
Is it profitable to install autonomous heating?
The cost of purchasing, installing and setting up autonomous heating equipment that runs on a mixture of propane and butane is much lower than connecting to the main line.
This system also significantly reduces the risk of a sudden drop in pressure. Autonomous heating is equipped with tanks that keep the fuel available after it runs out in the main tank.
If gas is supplied, the safety system will block the solenoid valve. Once the supply is restored, the system must be restarted.
Experts' opinions
Forumhouse offers profitable solutions. Gas consumption for heating a house of 150 m2, according to experts, depends on the efficiency of the boiler, the correctness of the installed system, and the equipment manufacturer. For the most detailed cost calculation, you should consider:
- cost of combustible materials;
- operating costs;
- cost of equipment, its delivery and installation;
- air temperature during cold periods;
- mode of residence in the house (temporary or permanent);
- degree of modernization of the building (material of construction, presence of insulation, etc.).
Example: Forumhouse user used the following as calculation data:
- house area - 150 m2;
- duration of the heating period - 6 months;
- System efficiency - 0.5;
- specific power of the climatic zone is 1.5 kW.
After calculations, the following results were obtained:
- the average volume of raw materials to produce 1 kW/h of heat is 0.1 m 3 ;
- gas cost (approximate) - 5 rubles/m 3;
- the cost of 1 kW/h of gas is 0.5 rubles;
- heating costs for the season - 11,000 rubles.
Advantages and disadvantages of using gas boilers over large areas
Gas heating has its benefits:
- When using this fuel, the boiler walls are not damaged by corrosion. This factor increases the service life of the equipment.
- Gas is an environmental material. When it burns, virtually no harmful substances are released into the atmosphere.
- Due to the small amount of sulfur, high gas combustion efficiency is achieved.
The use of gas boilers is also beneficial:
- Installing equipment is much cheaper than connecting to the main line;
- Gas in cylinders has better properties.
- The operation of the boiler does not depend on pressure and breakdowns in the main line.
- Gas consumption for heating a 150 m2 house in winter is significantly reduced.
- Modern equipment is equipped with various security systems. This is important, because gas is a flammable and explosive substance.
Disadvantages include:
- the need for constant replacement of cylinders;
- dependence on atmospheric pressure;
- shutting down the system automation in the event of a lack of electricity.
Important! Regardless of which system the boiler is powered by (autonomous or mains), at the beginning of the heating season the settings should be checked and adjusted. Repairs should only be carried out by a specialist. Do not forget about mandatory room ventilation and compliance with safety precautions.
Influence on gas consumption of a gas holder in a house of 150 sq.m. m
The main parameter that affects the gas consumption for heating a 150 m2 house from a gas tank is the evaporation mirror.
A gas holder is a special tank for storing gaseous substances.
The evaporation surface is the area of natural gas evaporation inside the gas tank. The larger the area, the greater the amount of heat.
Gas consumption and heating efficiency are influenced by the climatic conditions of a particular area. Therefore, calculations and selection of equipment should be carried out by specialists.
One 4.8 ton is enough for approximately 160-240 days of work. In this case, the consumption per 1 m 2 ranges from 20 to 30 liters per year. During the warm period, the amount of fuel used is significantly reduced.
When calculating gas consumption, you should take into account the main set of equipment, losses in the gas pipeline, additional modules (number and area of radiators, heated floors, etc.).
The average gas consumption from the gas tank is given in the calculations.
An approach to choosing a heating installation for a house with an area of 150 square meters. m
It is necessary to determine:
- the most affordable energy source in the region;
- ease of use (house area, complexity of equipment, etc.).
It is also necessary to take into account the environmental friendliness of the product and the availability of its delivery.
How to reduce gas consumption
Each fuel saving measure per 1 square meter can significantly reduce gas consumption for heating a 150 m2 house. These include:
- Insulation of walls (inside or outside), as well as floors and roofs, replacement of windows.
- Application of various methods to optimize the heating process (for example, automatically reducing the amount of fuel supplied, turning off the system, etc.).
- Organizing the launch of heated air into the system. More than half of the energy is spent on heating the cold air that enters the building from the outside.
- Application of the "Warm Floor" system. In this case, the coolant heats up to approximately 50°, and in the radiator system - up to 90°.
Example of calculating gas consumption
In reality, for heating 1 sq. m of room requires approximately 50 W of energy per hour. Accordingly, gas consumption for heating a house of 150 m2 will be 7500 W/h, or 7.5 kW/h.
To calculate the volume of the required amount of fuel for a given area, the formula is used:
L = Q / (qh x 0.92), where:
- L is the amount of fuel consumed per 1 hour, m3.
- Q - power required for heating, kW.
- qh is the lowest heat of combustion of fuel (for this case - 10.175 kW/m 3).
- 0.92 - efficiency factor of the boiler installation.
Thus, the gas consumption for heating a house of 150 m2 in cubes looks like this:
- 7.5 / (10.175 x 0.92) = 0.80 m 3 / h of natural gas.
- 0.80 x 24 = 19.2 cubic meters, and for a month - 19.2 x 30 = 576 cubic meters.
Consumption per 1 m2 per month will be: 576 /150 = 3.84 cubic meters.
Consumption of bottled gas for an area of 150 m2
In order to calculate what gas consumption for heating a 150 m2 house the owner expects, it is necessary to calculate the gas consumption in kilograms and then convert the value into liters.
For example, the calorific value of gas is 13 kW/kg. Substitute into the formula given above and get:
7.5 / (13 * 0.92) = 0.62 kg/h.
One liter of liquefied gas weighs approximately 0.55 kg, which means that for an hour of heating a house you will need: 0.62 / 0.55 = 1.12 liters. Per day - 27 liters, and per month - 811.
Considering the standard volume of the cylinder (42 l), you can calculate the required number for 30 days: 811/30 = 19 pieces.
Important! By choosing the right heating equipment and combustible materials, you can significantly save on utility bills. Insulating your home further reduces heating costs.
Autonomous or central heating is often based on the use of a gas boiler, which is installed in the boiler room. The profitability of such heating should be determined at the design stage by determining fuel requirements. The calculations are quite simple, the main thing is to know how many meters are heated and what is the power of the equipment.
Installation of gas boilers is considered the optimal solution for areas with a gas supply network. Natural gas has many advantages. This is an environmentally friendly product, affordable, and has high heat transfer. But when choosing a boiler, it is important to immediately determine how much gas the unit uses to heat different areas: from 80 m2 to 400 m2.
Factors affecting fuel consumption:
- Gas boiler power;
- Area of the house or apartment;
- Possible heat losses (number of windows and doors, their tightness, wall thickness and other important parameters).
When purchasing a gas boiler for long-term service, it is important to take into account all the nuances of choosing a unit. You should understand in advance how much gas is spent on heating a certain area and volume of the building. Only with a responsible approach can you have economical benefits from such a purchase.
Main gas flow in gas heating boilers: formulas
Gas consumption in boilers directly depends on the power of the heater. The necessary power calculation is carried out when purchasing heating equipment. In this case, they rely on the size of the heated area. The calculation is carried out individually for each room, taking into account the lowest average annual temperature.
The resulting calculations will need to be divided in half. This is due to the fact that throughout the season the temperature changes from plus to minus. In this case, gas consumption will also be different.
When calculating power, they use the ratio of kilowatts per 10 m2 of space that is heated. Taking into account temperature changes, only half of the value will be needed, which is only 50 W per hour. For an area of 100 m2, 5 kW is enough. Formula for calculating natural gas: A = Q / q * B.
Explanation of the formula:
- A – the required amount of gas for heating;
- Q – boiler power for heating a house (5 kW is enough for 100 m2);
- q is the minimum amount of specific heat, measured in kilowatts and depends on the type of gas;
- B – boiler efficiency, percentages should be converted.
To determine consumption, simply substitute the original data into the formula. For a house with an area of 100 m2, 0.557 cubic meters per hour is enough. For 150 m2 you will need 0.836, and for an area of 200 m2 - 1.114. To find out how much a gas unit consumes per day, simply multiply the resulting number by 24. Multiplying the indicator by 30 will determine how many cubic meters are needed for heating per month.
A simple calculation of the consumption of a liquefied gas boiler per month
The above calculation formula is also used for other types of fuel. This way you can calculate the amount of liquefied gas in cylinders. The calorific functions of this type of fuel have their own differences. Liquefied gas is calculated in kilograms and then converted to liters.
Gas consumption from the gas tank per month:
- For an area of 100 m2 you will need 560 liters;
- For 150 m2 – 842 l;
- For 200 m2 you need 1122 liters;
- An area of 250 m2 is heated with 1403 l.
A regular cylinder holds 42 liters. To determine the number of cylinders per year, it is enough to divide the amount of gas by the standard size of the gas tank (42). Then you should multiply the number of cylinders by the cost of one to get the cost of such heating.
Average calculator for calculating gas consumption for heating a house
Finding out gas consumption for the last season is quite simple. It is enough to take into account the monthly meter readings. When the heating season comes to an end, you should simply add up all the data.
Next, the arithmetic average is calculated. But to calculate the required amount of gas at the stage of purchasing a boiler, you will need to use a special formula. Gasification of an autonomous system of a private house, cottage or apartment involves the use of an average calculator, while determining heat loss. This is just an approximate calculation.
Methods for calculating specific heat consumption:
- Depending on the total area of heated rooms. Here they rely on the climatic conditions of the region. For 1m2 you will need approximately 30-40 watts.
- Considering the total area of the building. So every square meter of a room with a room height of 3 m requires 100 W of heat. You will also need to take into account the climate of the region.
The main thing when making calculations is to take into account the required boiler power, which is capable of providing the premises with the required heat. When calculating, they are guided by the average figure for which 1 kW of energy is used per 10 m2. Although this calculation is the simplest, it cannot take into account all the features of the region and the building itself.
The average calculator assumes that 10 square meters of area requires 1 kW of heat energy.
Calculating gas use will help not only choose the right boiler, but also reduce gas consumption costs. This will help save on heating costs. This way you can insulate your house and find ways to reduce heat loss.
An example of calculating gas consumption for heating a private house from the network
A clear example will help you better understand the specifics and features of the calculations. This calculation can be used for both an apartment and a country house. First you need to collect initial data.
Initial calculation parameters:
- Area of premises – 100 m2;
- Boiler power – 10 kW;
- The efficiency of the thermal unit is 95%.
First you need to convert joules to kilowatts. 1 kW has 3.6 MJ. It should also be understood that the norm of 10 kW is used to heat the house in the coldest times. But there are not many particularly cold days during the season.
On more favorable winter days, so many kilowatts for heating are not required. That is why this parameter is usually divided in half when making calculations. Next, the obtained data is substituted into a special formula. And by multiplying the indicator by tariffs, the economic part of gas consumption can be calculated.
Once you know the required amount of fuel per hour, you can make calculations for the entire season. The resulting number should be multiplied by 24 to obtain the daily consumption rate. Then the obtained data is multiplied by 30 and the required amount of gas per month is obtained. The calculation for the season takes into account heating for 7 months.
Gas consumption for heating a house 100 m2
Finding out how much heat is used to heat rooms is quite simple. You can sum up the costs after the heating season or calculate the cost of heating when purchasing a boiler. With the help of simple formulas and an online calculator, this event does not cause difficulties.
Despite the clear leadership of gas boilers in terms of fuel costs, large bills can come when using it. To avoid this, careful calculations of gas consumption for heating a private home are required. To find out the energy efficiency of the entire system, you will need data on...
Most often we think about how much fuel we have used when bills for the heat received arrive. And if the amount is frighteningly large, we begin to carry out calculations. There are methods that make it possible to calculate, for example, both at the design stage and in a completed building, the gas consumption for heating a house of 200 m2. The results obtained will help to audit the heating system and develop methods to reduce the costs 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. This is methane purified from impurities with the addition of a tiny amount of fragrance to facilitate leak detection. Such gas is transported through gas transportation systems to consumers.
Liquefied mixture propane with butane, which is pumped into a gas tank and provides autonomous heating. When this liquid transforms into a gaseous state, the pressure in the tank increases. Under high pressure, the gas mixture rises through pipes to the point of consumption.
Both types have their pros and cons:
When connecting to a main line, there is always a risk of pipeline breakage, pressure reduction in him. The gas tank provides complete autonomy; you only need to monitor the availability of gas;
gas tank equipment and its maintenance expensive. But this is the only possibility of gas heating if there is no mains in the accessible vicinity;
to calculate the gas consumption for heating a house of 100 sq m, perform fuel calorie comparison from the main line and the liquefied mixture in the cylinder. The calorie content of a propane-butane mixture is three times greater than that of methane: the combustion of 1 m 3 of the mixture produces 28 kW, and the combustion of the same amount of methane produces 9 kW. Accordingly, different amounts will be spent on heating the same area.
The liquefied mixture is often pumped into small containers for autonomous heating.
For autonomous heating, liquefied gas in cylinders is also used
What increases gas consumption
Gas consumption for heating, in addition to its type, depends on such factors:
Climatic peculiarities terrain. The calculation is carried out for the lowest temperature indicators characteristic of these geographical coordinates;
Square the entire 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.
The year the house was built and the location of the heating radiators are also important.
Calculation of main gas flow
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, and there is insulation. Then, to heat 10 m2 of area, an average of 1 kW of energy is consumed at a temperature lower than –10 0 C. Since this temperature, on average, lasts only half of the heating season, we can take the base value as 50 W*m/hour.
Gas consumption for heating a house of 150 m2 will be determined by the ratio
A = 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 a given room.
q is responsible for the type of gas and provides specific heat. For example, q = 9.45 kW (G 20 gas).
ɳ shows the efficiency of the boiler expressed in relation to unity. If efficiency = 95%, then ɳ = 0.95.
Let's carry out the calculations and find that the gas consumption for a house with an area of 150 m2 will be equal to 0.836 m3 per hour, for a house measuring 100 m2 - 0.57 m3 per hour. To obtain the average daily quantity, the result obtained is multiplied by 24, for the monthly average - multiplied by another 30.
If you change the boiler efficiency to 85%, 0.93 m 3 will be consumed per hour.
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 m3, 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 m2, 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 equal to 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 = 10 / (6.58 * 0.95) = 1.6 l/hour
Average daily consumption will be 1.6 * 24 = 38.4 (l)
Provided that a cylinder with a capacity of 50 liters is used, but filled for safety reasons to 42 liters, it can be argued that it will last for approximately a little more than a day.
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 carried out in order to determine the gas consumption for heating a 100 m2 house from a gas holder. Its quantity will also be determined in liters.
A = 5 / (6.58 * 0.95) = 0.8 l/hour
In a day, the gas tank will be empty by 19.2 liters, and in a month - by 576 liters, over a heating season of 7 months - by 4032 liters. This must be taken into account in order to replenish the capacity in a timely manner.
The gas tank is refilled using 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 a given region. By simply multiplying two numbers, you can determine 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 a propane-butane mixture. However, when comparing the heating consumption of a building of 100 m2, methane requires an average of about 3000 m3, and only 1000 m3 of liquefied mixture. Therefore, it can be argued that how much liquefied gas costs for heating a house is the same price for main gas, due to higher consumption.
Video description
About the nuances of heating a house from a gas tank and pricing, see clearly in the video:
How to pay less
Since you won’t be able to significantly win in price by installing autonomous heating, you need to turn to energy-saving technologies.
Carry out a thorough insulation not only the walls of the building, but also the roof, floor, foundation, even the basement, if there is one.
Replace double glazed windows for energy-saving ones, the profile is frost-proof.
Install the boiler with maximum efficiency and an electronic thermostat.
Check the state of the house's thermal insulation on a thermal imager to identify cold spots and eliminate them.
Change ventilation and air conditioning system. Just an open vent or a window set for ventilation takes in more heat than a window opened for 5-7 minutes and a complete change of air in the room.
Equip warm floor, especially in halls and hallways.
Install electronic radiators sensors, to block heating above the set temperature.
It is very effective to use the smart home system, which will reduce gas consumption by at least 25%. If you follow all the tips, your home will be warm and cozy, and your gas bills won’t be terrible.
The smart home system is easier and more comfortable to control using a remote control
On our website you can find contacts of construction companies that offer the service. You can communicate directly with representatives by visiting the “Low-Rise Country” exhibition of houses.
Conclusion
If a house is built according to a well-designed project, then what the gas consumption will be during the heating season can be imagined in advance. If calculations are made for an existing house, with the goal of insulating it, then the best solution would also be to turn to professionals who will not only mechanically do their job, but will also be able to advise something.
Gas is still the cheapest type of fuel, but the cost of connection is sometimes very high, so many people want to first assess how economically justified such expenses are. To do this, you need to know the gas consumption for heating, then you can estimate the total cost and compare it with other types of fuel.
Calculation method for natural gas
The approximate gas consumption for heating is calculated based on half the power of the installed boiler. The thing is that at the lowest temperature is set. This is understandable - even when it is very cold outside, the house should be warm.
But calculating gas consumption for heating using this maximum figure is completely incorrect - after all, the temperature is generally much higher, which means much less fuel is burned. That’s why it is generally accepted that the average fuel consumption for heating is about 50% of the heat loss or boiler power.
We calculate gas consumption by heat loss
If you don’t have a boiler yet, and you estimate the cost of heating in different ways, you can calculate it from the total heat loss of the building. They are most likely known to you. The technique here is this: they take 50% of the total heat loss, add 10% to provide hot water supply and 10% to remove heat during ventilation. As a result, we obtain the average consumption in kilowatts per hour.
Next, you can find out the fuel consumption per day (multiply by 24 hours), per month (by 30 days), and, if desired, for the entire heating season (multiply by the number of months during which the heating operates). All these figures can be converted into cubic meters (knowing the specific heat of combustion of gas), and then multiply the cubic meters by the price of gas and, thus, find out the heating costs.
| Crowd name | Unit | Specific heat of combustion in kcal | Specific heat of combustion in kW | Specific heat of combustion in MJ |
|---|---|---|---|---|
| Natural gas | 1 m 3 | 8000 kcal | 9.2 kW | 33.5 MJ |
| Liquefied gas | 1 kg | 10800 kcal | 12.5 kW | 45.2 MJ |
| Coal (W=10%) | 1 kg | 6450 kcal | 7.5 kW | 27 MJ |
| Wood pellets | 1 kg | 4100 kcal | 4.7 kW | 17.17 MJ |
| Dried wood (W=20%) | 1 kg | 3400 kcal | 3.9 kW | 14.24 MJ |
Example of heat loss calculation
Let the heat loss of the house be 16 kW/hour. Let's start counting:
Convert to cubic meters. If we use natural gas, we divide the gas consumption for heating per hour: 11.2 kW/h / 9.3 kW = 1.2 m3/h. In calculations, the figure 9.3 kW is the specific heat capacity of natural gas combustion (available in the table).
Since the boiler has not 100% efficiency, but 88-92%, you will have to make further adjustments for this - add about 10% of the obtained figure. In total, we get gas consumption for heating per hour - 1.32 cubic meters per hour. Next you can calculate:
- consumption per day: 1.32 m3 * 24 hours = 28.8 m3/day
- monthly demand: 28.8 m3/day * 30 days = 864 m3/month.
The average consumption for the heating season depends on its duration - multiply by the number of months while the heating season lasts.
This calculation is approximate. In some months, gas consumption will be much less, in the coldest month - more, but on average the figure will be about the same.
Boiler power calculation
The calculations will be a little simpler if you have the calculated boiler power - all the necessary reserves (for hot water supply and ventilation) have already been taken into account. Therefore, we simply take 50% of the calculated capacity and then calculate the consumption per day, month, per season.
For example, the design power of the boiler is 24 kW. To calculate gas consumption for heating, we take half: 12 k/W. This will be the average heat demand per hour. To determine fuel consumption per hour, we divide by the calorific value, we get 12 kW/hour / 9.3 k/W = 1.3 m3. Then everything is calculated as in the example above:
Next, add 10% for the imperfection of the boiler, we find that for this case the consumption will be slightly more than 1000 cubic meters per month (1029.3 cubic meters). As you can see, in this case everything is even simpler - fewer numbers, but the principle is the same.
By quadrature
Even more approximate calculations can be obtained based on the square footage of the house. There are two ways:
Each owner can assess the degree of insulation of his home; accordingly, one can estimate what gas consumption will be in this case. For example, for a house of 100 sq. m. with average insulation, 400-500 cubic meters of gas will be required for heating, for a house of 150 square meters it will take 600-750 cubic meters per month, for heating a house with an area of 200 m2 - 800-100 cubic meters of blue fuel. All this is very approximate, but the figures are derived based on many factual data.
Calculation of liquefied gas consumption
Many boilers can run on liquefied gas. How profitable is this? What will be the consumption of liquefied gas for heating? All this can also be calculated. The technique is the same: you need to know either the heat loss or the power of the boiler. Next, we convert the required quantity into liters (units of measurement of liquefied gas), and, if desired, we count the number of required cylinders.
Let's look at the calculation using an example. Let the boiler power be 18 kW, respectively, the average heat demand is 9 kW/hour. When burning 1 kg of liquefied gas we get 12.5 kW of heat. This means that to get 9 kW, you will need 0.72 kg (9 kW / 12.5 kW = 0.72 kg).
- per day: 0.72 kg * 24 hours = 17.28 kg;
- per month 17.28 kg * 30 days = 518.4 kg.
Let's add a correction for the boiler efficiency. We need to look at each specific case, but let’s take 90%, that is, add another 10%, it turns out that the monthly consumption will be 570.24 kg.
Liquefied gas is one of the heating options
In total, this boiler will require 27 liquefied gas cylinders. Calculate the cost yourself - prices vary in the regions. But don't forget about transportation costs. By the way, they can be reduced by making a gas holder - a sealed container for storing liquefied gas, which can be refilled once a month or less often - depending on the storage volume and demand.
Again, remember that this is just an approximate figure. In cold months, gas consumption for heating will be higher, in warm months it will be much less.
- 1 liter of liquefied gas weighs approximately 0.55 kg and, when burned, produces approximately 6500 kW of heat;
- There are about 42 liters of gas in a 50 liter cylinder.