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 costs are. To do this, you need to know the gas consumption for heating, then it will be possible to estimate the total cost and compare it with other types of fuel.
Method of calculation for natural gas
The approximate gas consumption for heating is calculated based on half the capacity of the installed boiler. The thing is that at the lowest temperature is laid. This is understandable - even when it is very cold outside, the house should be warm.
But it is completely wrong to calculate the gas consumption for heating according to this maximum figure - after all, in general, the temperature is much higher, which means that much less fuel is burned. Therefore, it is customary to consider the average fuel consumption for heating - about 50% of the heat loss or boiler power.
We calculate the gas consumption by heat loss
If there is no boiler yet, and you estimate the cost of heating in different ways, you can calculate from the total heat loss of the building. They are most likely familiar to you. The methodology here is as follows: they take 50% of the total heat loss, add 10% to provide hot water supply and 10% to heat outflow during ventilation. As a result, we get 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), if desired - for the entire heating season (multiply by the number of months during which the heating works). All these figures can be converted into cubic meters (knowing the specific heat of combustion of gas), and then multiply cubic meters by the price of gas and, thus, find out the cost of heating.
| The name of the crowd | Unit | Specific heat of combustion in kcal | Specific heating value in kW | Specific calorific value 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 |
| Hard coal (W=10%) | 1 kg | 6450 kcal | 7.5 kW | 27 MJ |
| wood pellet | 1 kg | 4100 kcal | 4.7 kW | 17.17 MJ |
| Dried wood (W=20%) | 1 kg | 3400 kcal | 3.9 kW | 14.24 MJ |
Heat loss calculation example
Let the heat loss of the house be 16 kW / h. 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 does not have 100% efficiency, but 88-92%, you will still have to make adjustments for this - add about 10% of the figure obtained. In total, we get the gas consumption for heating per hour - 1.32 cubic meters per hour. You can then calculate:
- consumption per day: 1.32 m3 * 24 hours = 28.8 m3/day
- demand per month: 28.8 m3 / day * 30 days = 864 m3 / month.
The average consumption for the heating season depends on its duration - we multiply it by the number of months that the heating season lasts.
This calculation is approximate. In some month, gas consumption will be much less, in the coldest - more, but on average the figure will be about the same.
Boiler power calculation
Calculations will be a little easier if there is a calculated boiler capacity - all the necessary reserves (for hot water supply and ventilation) are already taken into account. Therefore, we simply take 50% of the calculated capacity and then calculate the consumption per day, month, per season.
For example, project capacity boiler - 24 kW. To calculate the gas consumption for heating, we take half: 12 k / W. This will be the average need for heat per hour. To determine the fuel consumption per hour, we divide by the calorific value, we get 12 kW / h / 9.3 k / W = 1.3 m3. Further, everything is considered as in the example above:
Next, we add 10% for the imperfection of the boiler, we get that for this case the flow rate 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 by the quadrature of the house. There are two ways:
Each owner can evaluate the degree of insulation of his house, respectively, you 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, 600-750 cubic meters per month for a house of 150 square meters, 800-100 cubic meters of blue fuel for heating a house of 200 m2. All this is very approximate, but the figures are based on many factual data.
Calculation of the consumption of liquefied gas
Many boilers can run on LPG. How beneficial is it? 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 heat loss or boiler power. Next, we translate the required amount into liters (units of measurement of liquefied gas), and if desired, we consider the number of required cylinders.
Let's look at the calculation with an example. Let the boiler power be 18 kW, respectively, the average heat demand is 9 kW / h. When burning 1 kg of liquefied gas, we get 12.5 kW of heat. So, to get 9 kW, you 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 efficiency of the boiler. It is necessary to look in 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 cylinders of liquefied gas. And consider the cost yourself - prices vary by region. But don't forget about shipping costs. By the way, they can be reduced if you make a gas tank - a sealed container for storing liquefied gas, which can be refueled once a month or less - depending on the storage volume and needs.
And again, do not forget that this is only an approximate figure. In cold months, gas consumption for heating will be more, in warm months - much less.
- 1 liter of liquefied gas weighs approximately 0.55 kg and, when burned, gives approximately 6500 kW of heat;
- There are about 42 liters of gas in a 50 liter bottle.
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 influence high pressure the gas mixture rises through pipes to the place 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 gas heating if there is no highway 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. Source blog.mybacharach.com
house insulation
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 coefficient useful action 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. Source site
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 Source pinterest.cl
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 complete replacement 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 controlled by the remote control Source archidom.ru
On our site you can find contacts of construction companies that offer the service of designing country houses. 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.
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 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.
conclusions
Now you have an idea of what is the gas consumption for heating a house of a certain area. The above calculation algorithm allows you to calculate this indicator in kilowatts. You can also find out the estimated consumption, focusing on the data from technical passport. Each manufacturer indicates the level of gas consumption by a particular boiler. Knowing these figures based on 1 hour, you can easily calculate the annual budget for "blue fuel" needed to heat a particular house.
As for the recommendations on savings, the most important of them is this - correctly select the equipment specifically for your home. So you can avoid a fatal mistake - buying the wrong heating equipment. It also makes sense to take care of the thermal insulation of your home, the installation of a "warm floor" system, the aggregation of equipment with external sensors, and a host of other opportunities to make gas consumption optimal for comfortable heating of your home.
How to calculate gas consumption for heating a house
Gas heating is one of the most optimal and profitable. By choosing it, there is no need to prepare firewood and briquettes before each winter period. However, before buying a heating gas boiler, you should approximately know what the coolant flow rate will be. The calculated value may depend on many factors:
- Size of living spaces
- Building materials used in the construction of the frame
- Quality of surface insulation (floor, ceilings, walls)
- Heating equipment power
It is necessary to calculate the gas consumption for heating a house not only to compare the economic benefits when using other sources of thermal energy. It will be possible to determine what measures should be taken to reduce energy costs and their profitability.
We make a calculation taking into account the power of the boiler
Gaseous fuels can be propane, butane, methane, hydrogen, as well as traditional natural gas. Natural gas reserves exceed the volumes of oil and coal, so it is important to correctly calculate such an economical energy source used in heating systems, cooking and other household needs, including hot water supply.
A competent independent calculation of the total gas consumption will not require special skills, given the main parameters of the equipment.
To perform independent calculations, you will need to know the power level of the boiler used and the area of \u200b\u200bthe room, as well as use tabular data.
Round-the-clock operation of the unit in a monthly mode involves multiplying the data in order to obtain kilowatt-hours. The choice of the power of the unit is carried out based on the total area of home ownership, and when calculating the volume of blue fuel consumed, it is always necessary to focus on the lowest temperature indicators outside the window.
By quadrature
It is important to remember that in order to calculate by quadrature, it is necessary to find the derivative of the equipment power by the number of hours per day and the number of days per week. It is especially important to correctly calculate the energy consumption for heating according to the operating mode and taking into account the use of 1.0 kW for every 10 m² of heated area.
Table: indicators for calculating fuel consumption
For example, for full-fledged, as well as the most efficient heating of a room with a total area of 30 m², it is necessary to purchase a boiler with a power of only 3.0 kW. Therefore, to heat one square meter of area, it will be necessary to spend 100 W of thermal energy, taking into account the height of the room up to 300 cm.
V = Q / (q x efficiency / 100), where:
- V - standard indicators of volumetric gas flow per hour for each cubic meter.
- Q - heat losses and power of the heating system in kW.
- q - the lowest indicators of the specific calorific value of the energy carrier in kW / m³.
- Efficiency - indicators of the efficiency of the operated equipment.
For example, to warm up air masses in a room with a total area of 90 square meters, V = 9.0 / (9.2 x 96 / 100) = 9.0 / 9.768 = 0.92 m³ / hour is consumed.
Kzap × OP × RT × KR × 1kW / 860 kV, where:
- K zap is a correction value equal to 1.15 or 1.20.
- OP is an indicator of the total volume of the room.
- RT is the temperature difference between indoors and outdoors.
- KR are indicators of the dispersion coefficient.
For example, 1,000 mg of standard fuel is 7,000 kcal, and in other terms - 7 × 10 - 3 Gcal, while ideal under conditions of 1 efficiency are indicators of the specific consumption of a standard unit of fuel to generate 1.0 Gcal of heat.
One of the most common options for calculating the cost of gas for heating a house is to take into account the characteristics of the installed boiler. Before purchasing it, it is recommended not to make a mistake with the power, which can be determined based on the ratio: 1 kW for every 10 squares of heated premises.
If the boiler power is greater, there is nothing to worry about. However, if it is not enough, you should think about buying updated, more modern and productive equipment.
[monthly consumption] = [capacity]*[average number of days in a month]*[hours in a day]
Thus we get: 10 kW * 30 days * 24 hours = 7200 kW / h. It should be noted that the boiler is unlikely to function for a full day, so the resulting value is divided by two - it turns out 3600 kW / h.
[seasonal consumption] = [monthly consumption]*[heating season duration]
In each region, the duration of the heating season can last differently. When calculating, it is recommended to take given value equal to seven. Thus, we get 3600 kWh * 7 months. = 25200 kWh.
[heating costs] = [expenditure per season]*[price of 1 kWh]
It remains only to clarify what the cost of one kWh will be during the winter. By multiplying the numbers, it will be possible to approximately determine the material costs of heating for the entire cold period.
about models and specifications gas double-circuit boilers read here
First, from its power. The larger it is, the higher the consumption of gas boilers will be. Moreover, you will not be able to reduce the appetite of a heat-generating device through the use of it. If you purchased a 20 kW gas hearth, then even at a minimum it will consume more than a 10 kW appliance at maximum. Therefore, be careful when choosing the power of heat generating devices.
Secondly, from the temperature "overboard". In this case, the already mentioned power regulator comes into play. After all, at a low temperature in the house, we will try to squeeze the maximum number of calories out of the heating by turning the regulator knob to the maximum. And if in relatively warm (for winter) weather the regulator is set to “one” or “two”, then at 30- or 40-degree frosts it is switched to “five” or even “seven”. And the number of cubic meters of gas passing through the nozzles into the combustion chamber doubles.
Thirdly, from the calorie content of gas. The consumer does not control this value. Therefore, gas distribution companies sometimes play pranks with the composition of "blue" fuel. After all, the same compressed nitrogen pumped into the central pipeline costs 2.5-3 times cheaper than natural gas. Now, fortunately, such fraud schemes are no longer practiced, but gas workers can easily supply “undryed” gas with a high content of water vapor and other impurities into pipes.
Fourth, from technical condition heat exchanger. The heating of water or coolant in gas appliances occurs in a heat exchanger - a special copper pipeline located either in the combustion chamber or outside its walls. And if the heat exchanger becomes clogged with scale or scale residues from the batteries, then you will have to add power to compensate for the reduced heat transfer. Moreover, a clogged heat exchanger steals cubic meters much more actively than real or mythical dodgers from a gas distribution company.
Fifth, on the number of heating circuits. In almost all modern gas boilers costs more than one heating circuit. After all, such heat-generating devices serve not only the wiring of the heating system, but also the line of domestic hot water supply. To do this, a second circuit is mounted in the design of the gas hearth and the throughput at the nozzles is increased, increasing the power. And the more power, the higher the consumption.
The installation of gas boilers is considered the best solution for areas with a gas supply network. Natural gas has many advantages. This is an environmentally friendly product, affordable, has a 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;
- The area of the house or apartment;
- Possible heat losses (number of windows and doors, their tightness, wall thickness and other important parameters).
When buying a gas boiler for a long service, it is important to consider all the nuances of choosing a unit. It should be understood 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 an economical benefit from such a purchase.
Gas consumption in boilers directly depends on the power of the heater. The necessary calculation of power 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.
When calculating the power, use the ratio of kilowatts per 10m2 of the room that is heated. Given the temperature differences, only half of the value is needed, and this is only 50 watts per hour. For an area of 100m2, 5 kW is enough. Formula for calculating natural gas: A = Q / q * B.
Deciphering the formula:
- A - the required amount of gas for heating;
- Q - boiler power for heating a house (5 kW is enough for 100 m 2);
- q - the minimum amount of specific heat, measured in kilowatts and depends on the brand of gas;
- B - boiler efficiency, percentages should be converted.
To determine the consumption, it is enough just to substitute the initial data into the formula. For a house with an area of 100 m2, 0.557 cubic meters per hour is enough. For 150 m2, 0.836 will be required, and for an area of 200 m2 - 1.114. To find out how much a gas unit consumes per day, it is enough to multiply the resulting number by 24. Multiplying the indicator by 30 will determine how many cubic meters are needed for heating per month.
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 QDHW in the above formula and determine the additional gas consumption for DHW.
Before the owner of a private house, even at the stage of construction of the building, the question arises of how and how the dwelling will be heated. Lots of options. The boiler is the main element of the heating system. Various modifications devices operate on coal, wood, natural or liquefied gas. Suppose it is more convenient for the owner of a private house to use liquefied gas. What is the consumption of liquefied gas for heating a house of 150-200 m2?
Liquefied gas is a symbiosis of ethylene, propane, butane and others. chemical compounds. It releases more energy than other fuels. This is a scientifically established fact.
You can calculate the energy consumption for heating a house of 150-200 m2 using the simplest formula, based on which 1 kilowatt per hour is needed to heat 10 square meters of a building. It turns out that 24 kilowatts will be required per day for 10 squares, and 480 kilowatts for 200 squares. This formula takes into account all the "needs" of the building for heat.
It is necessary to take into account not only the area of \u200b\u200bthe building, but its cubic volume, which involves the introduction of data such as the height of the walls.
If we talk about a standard building, where the height of the walls does not exceed 250 centimeters, then the same simple formula can be used.
It is applicable both if the house is used permanently and when it is used as a temporary dwelling. So advise experienced builders.
If the house has a standard wall height of 2.5 meters, then the gas consumption for heating is calculated by a simple formula - 10 squares “consume” 1 kilowatt of energy
If the house is your fortress, and the "weather" inside is an important factor for you, then it is advisable to include the thermal stability of the entire house and the temperature values outside the window into the calculation of the cost of heating the house of 150-200 m2. To do this, you will have to turn to professionals. Is this option not right for you? Then we use a simple formula.
Important: the gas boiler does not work around the clock. Usually the operating mode is this - 1 hour the equipment is working, 1 hour is resting. This means that according to a simple formula, the energy consumption per day for heating a house of 200m2 will be 240 kW.
You can learn more about the operation of a gas boiler from the following video:
Let's assume that winter in the region where you live lasts about 200 days (October - end of March, beginning of April). Then for the season the building will consume 48 thousand kW. So far, we are talking only about energy, and not about the liquefied gas itself. It is very important to find out exactly the amount of "power" that the house needs for heating during the entire cold period. These data are necessary to calculate the consumption of liquefied gas for heating a house of 150-200 m2.
Costs of a gas boiler on liquefied gas: we calculate the indicators
For the entire heating season, a house with an area of 200 square meters will consume about 48,000 kilowatts of thermal energy. Liquefied gas has its own ability to "create heat". It shows the ratio of a unit of fuel to the energy released by it during combustion (combustion).
Scientists have calculated that the calorific value of one cubic meter of liquefied gas is equal to 6.55 kW of heat energy.
One liter of liquefied natural gas releases 6.55 kilowatts of energy when burned.
To find out how much reduced gas is needed to heat a house of 200 square meters, let's take the amount of energy that the building will consume during the entire cold period (48 thousand kilowatts) and divide it by the calorific value of this type of fuel (6.55 kW). It turns out approximately 7330 liters.
If we add another 10 percent to 7330 liters, we get 8063 liters. This will be the consumption of a gas boiler on liquefied gas.
Nuances and subtleties
It is important to understand what will be the consumption of liquefied gas for heating a house of 150-200 m2 in order to take care of the fuel storage method. You can keep it:
- in balloons. Their volume is small - from 10 to 50 liters. Regular replacement or refueling is required, which is not very convenient. In fact, about 35 liters will be needed for heating with liquefied gas per day;
- gas holders. This is a special storage (reservoir) for blue fuel. It can hold from 200 to 1000 liters, depending on the dimensions. It is necessary to build such a structure in accordance with the requirements and safety standards. To refuel the gas tank, you will need to call specialists. Unauthorized attempts can lead to fires and explosions.
Gas holder - a container for storing liquefied gas for heating - can hold up to 1000 liters of "blue fuel"
As for the prices for such heating, they depend on the region where you live.
A liter of liquefied gas at a cost varies from 12 to 20 rubles. Based on an average value of 15 rubles, during the heating season you will spend approximately 121 thousand rubles on a building with an area of 200 square meters.
Any other type of fuel will cost less. For natural blue fuel - about 40 thousand rubles, for firewood and coal - about 60 thousand rubles for the heating season.
How to reduce consumption?
It is possible to significantly, by a couple of tens of thousands of rubles, reduce the consumption of liquefied gas for heating a house by 150-200m2. To do this, you will have to insulate the room well (it is needed if a gas boiler is used in the building).
- insulate the foundation and roof, attic and basement. There you can lay a thin layer of mineral wool (this is the cheapest insulation);
- replace ordinary windows with plastic ones, which are considered more airtight;
- insulate the entrance metal door from within;
- believe and reduce;
- install a modern boiler. Experts recommend trusting companies such as Bosch, Buderus, Protherm, Vaillant. The price of a new boiler is from 20 to 100 thousand rubles;
- replace the old pipes of the heating system with new ones, check their tightness, connections;
- instead of the "ancient" batteries, put bimetallic, aluminum or steel radiators.
To minimize heat loss when heating with liquefied gas, replace old batteries with new radiators
Finally
LPG is one of the most expensive types of fuel today. If there is no other option, then minimize heat loss at home to avoid unnecessary costs. You can calculate the heating consumption using the simplest formula. This will be enough to understand how much to focus on.
10 square meters of a building consumes 1 kilowatt of energy per day. 1 liter of liquefied gas during combustion releases 6.55 kilowatts of energy. Use these numbers as a guide when making your calculations.
If you need a more complete and accurate calculation, it is advisable to turn to professionals. Although with a full and simple calculation, the figures differ slightly, by a couple of thousand rubles.
It is likely that you can save on the services of specialists by not hiring them at all.
You will learn how to calculate in the following video.
