When designing a heating system for a home, owners must first know how much it costs to heat their living space during operation. In the end, it may be that the heating system will be corny unprofitable in the case of improper selection of equipment, illiterate designing or poor thermal insulation of the walls. Therefore, it is important to correctly calculate the gas consumption for heating a house per 200 m2. It is already possible to build on the resulting figure and proceed or not proceed with the design and purchase of equipment.
We consider the gas consumption for heating a house to 200 m2
One of the main values in the formula when calculating is the power of the equipment. Without it, it is impossible to determine the gas consumption for heating a house per 200 m2. The boiler is selected based on the area of the house, and when calculating the flow rate, they are guided by the lowest air temperature outside the window. The resulting value is divided in half, because the outside temperature is not always minus. So the flow rate will vary in approximately the same proportions.
Determination of boiler power
When calculating the consumption of liquefied gas for heating a house per 200 m2, the boiler power is primarily determined. It is estimated that for every 10 square meters of heating area, 1 kW of power is needed. Based on the fact that the value must be divided in half, we take half - it is 50 watts per hour per square meter. For 100 meters of area we need 5 kW of power; 200 meters - 10 kW. This means that when choosing a heating boiler, we need to look for models with a capacity of 12-15 kW. It is recommended to choose equipment with a margin. If you choose a boiler with a capacity of 10 kW, then it must cope with its task, but if somewhere the heat loss in the house is higher than expected, then the boiler will work to the limit of its capabilities and will not always be able to provide proper heating.
Forum natural gas consumption for heating a house on 200 m2
There is a special formula according to which it is necessary to calculate:
A = Q / q * B.
In this formula:
- A is the amount of gas per hour to be determined.
- Q is the power required for heating (in our case, it will be equal to 10 kW).
- q is the minimum specific heat. This parameter depends on the brand of gas used. If G20 gas is used in your gas pipeline, this value will be equal to 34.02 MJ / cu. It must be converted into kilowatts according to the formula: 1 MJ = 0.277 (7) kW * h. It will be equal to 9.45 kWh.
- B - the efficiency of our equipment. The value depends on the boiler you choose. There are models on the market with KDP 80%, 90%, 95%, 98%. It is advisable to select a boiler with a higher efficiency. So the gas consumption for heating a house 200 per m2 will be less, and during the year the savings will be substantial. At least for several years, the savings will exceed the costs of a higher cost boiler with high efficiency. Suppose you select a model with 95% efficiency. However, we cannot put interest in the formula. Therefore, we take the coefficient 0.95 and use it.
All numbers are known to us. Now you just need to substitute them into the formula:
A = 10 / 9.45 * 0.95 = 1.0053 cc. m / hour.
This means that the average gas consumption for heating a house per 200 m2 is 1 cubic meter per hour. But this is provided that you use a boiler with an efficiency of 95%, and there is G20 gas in your pipeline. Otherwise, the values in the formula must be changed, the result will be slightly different.
Daily and monthly expenses
Now it remains for us to multiply the resulting figure by 24, and we will get the daily gas flow rate subject to continuous operation of the equipment. Next, multiply the value by 30 and get the monthly gas flow. In our case, the flow will be equal to 720 cubic meters. In principle, this is the real gas consumption for heating a house of 200 m2, you just need to find out the cost of one cubic meter for your region and calculate how much it will cost.
Calculation of liquefied gas
The above formula will work for liquefied gas. The only difference is the other thermal conductivity of the gas itself. Therefore, here the parameter q is taken equal to 46 MJ per kilogram or 12.8 kW per kilogram. We leave the boiler efficiency equal to 95. Substitute the values in the formula and get:
A = 10 / 12.8 * 0.95 = 0.74 kg / hour.
Liquefied gas is always counted in kilograms. Then the value is converted to liters. To do this, the resulting value must be divided by 0.54. In our case, a consumption of 1.37 liters of gas per hour is obtained. Further, according to the usual scheme:
- The daily consumption of liquefied gas will be equal to 33 liters.
- Monthly consumption is almost a thousand liters.
At the same time, it is worth considering that in the standard cylinder there are only 42 liters. This cylinder is enough for about a day. To understand how many cylinders we need, simply divide the amount of gas per season by 42. Next, knowing the cost of a cylinder of liquefied gas, you can calculate how much it costs to heat the house.
However, it is not necessary to buy cylinders. You can use a gas holder. The gas consumption for heating a house by 200 m2 in this case will not differ. Simply uploading a large amount of gas directly to a gas tank for the whole season will be more profitable than buying a large number of cylinders.
Consumption reduction
This is known: if the house is well insulated, the fuel consumption for heating will be significantly reduced. Therefore, before starting the selection and installation of equipment and laying main lines, it is necessary to warm the house well: walls, roof and attic, floor, replace windows, make a tight seal circuit on the doors.
Particular attention should be paid to the roof and windows. It is estimated that out of 100% of the lost heat, 35% goes through the roof, about 25% is lost on the windows. Therefore, use the best thermal insulation materials and good double-glazed windows, which are characterized by a low coefficient of thermal conductivity. Cheap double-glazed windows are immediately visible: their aluminum or steel "skeleton" in the winter is always very cold, and a lot of heat is lost directly through it. Even the glass itself does not transmit heat as much as the metal profile on which these glasses hold.
Underfloor heating or conventional batteries
Also, the correct heating design plays an important role. It is estimated that a well-designed and implemented underfloor heating will reduce gas consumption. Conventional batteries would require more gas to heat indoor air to the same level. This is due to the fact that thanks to the warm floor, heat rises from the bottom up and spreads over the entire area of the room. But ordinary batteries warm the outer wall, which is why their efficiency is lower.
Also, the standard temperature of the floor is 50 degrees, batteries - 90 degrees. Obviously, floors will be more efficient and economical. Yes, the design and installation of floors will cost more, but the price difference will pay off very soon.
We use modern automation
Well, and the obvious things: you can save gas by correctly setting the heating time. For example, if you are not at home from morning to evening, then in the boiler (if it supports such a function), you can set a low temperature on the thermostat and program a power increase by a certain time. And if you are not at home for weeks or even months, then ideally you need to set the temperature of the coolant at 3-5 degrees. And let the house be cold. The main thing is that the pipes do not freeze.
Modern technologies in this regard have gone far ahead. Many boilers can be equipped with modern automation, which will allow you to control the device remotely. You can set the boiler to change the mode from your smartphone while at work. For this, special GSM modules are installed on the equipment. And there are many similar smart systems. With proper use of them, the real consumption for heating can be reduced. Sometimes the savings can reach 30, 40 and even 50%. Of course, it depends on how often you are at home and what is the temperature outside the window.