How to choose the most efficient gas boiler Bashny.Net

It is natural desire of every homeowner to save fuel going to heating your private home. In particular, this applies to natural gas, which continues to grow steadily in price. The first step on the path to lean can be done at the stage of choosing a heat source, that is, to buy the most efficient gas boiler. About how to exercise such choice will be explained in our article.

What consumes the thermal energy of the gas?Before you start choosing, you need to know few important things about heating equipment. Natural gas coming into our homes on highways must comply with standards and have a certain calorific value. This value shows how the amount of heat produced by burning unit volume of gas. The task of the heating system as a way to direct this energy for heating buildings. The better it does, the higher the efficiency of its work.

For reference. In the post-Soviet space, it is customary to make calculations on the basis of the lowest or minimum of the heat of combustion of gas, with a value of 8000 kcal / m3 (33500 kJ / m3).The efficiency of the heat generator, or otherwise, is its efficiency expressed as a percentage of the calorific value of the fuel. In simple words, the value of efficiency gas-fired boiler shows what part of the heat of combustion of the fuel he gets into the house. Than this part more, the more you use the energy you pay less for losses, which means increasing efficiency. Between the two terms "effectiveness" and "efficiency" you can put a sign of equality.





A little bit about the process of burning natural gas. It is quite complicated, but we will not go into details and select the main substances produced as a result of the process. In the case when oxygen is sufficient and created ideal conditions for combustion, are allocated carbon dioxide (CO2 carbon dioxide) and normal water. Now list what is consumed, the thermal energy of fuel in the boiler installation:

• for heating the coolant;
• losses with the outgoing flue gases;
• on evaporation of the water formed during chemical reactions of combustion.

The most efficient and reliable gas boilers operate so that the first article of the consumption of energy has increased to the maximum, and the remaining 2 – to minimize.





 

How to determine the efficiency of the boiler?Before giving specific recommendations for the choice of an efficient heat source, clarify some points. The efficiency of a modern combustion plants firing natural gas is in the range of 90-98%. The lowest – budget non-volatile models with one – or two-stage burner. Work better modulation burner with electronic control, forced air supply, where power is infinitely adjustable and not stepwise. It should be understood that the burner only burns fuel, and the transfer of heat is the task of the other elements of the boiler.

Initially, the heat generated in the furnace directly heats the water jacket economical gas boiler. The remaining part of the heat along with the flue gases falls in a steel or cast iron heat exchanger. This is one of the most important stages, this is where the combustion products transfer their energy to the water, then flow into the chimney. The proportion of heat that enters is irretrievably lost, leaving the atmosphere.

How large this proportion is, it shows the temperature of the flue gases, showing the efficiency of the boiler. If the outlet conduit Assembly gas temperature is 200 degrees or more, then you are not too successful design of the heater. It allows you to go on the street too much heat. If the temperature of the combustion products is in the range of 100-150 ° C, the boiler can already be considered as a viable option.





The best performance temperature of exhaust gases issued gas condensing boilers. This is done by taking the heat of vaporization of water. In the previous section, we were told that released in chemical reaction the water evaporates, taking away part of the heat of combustion of natural gas. So, the most economical boilers are able to take this energy back, having condensed the resulting water vapor.

For this purpose the unit is used the burner is of cylindrical type, mounted inside of a heat exchanger made of stainless steel. The latter is a coil where the turns are close to one another, and circulates coolant inside. Steam has no other way but to go through the coil and to condense on its surface, giving warmth. The temperature of the flue gas condensing heat generators a record low – from 45 to 70 ° C, and the efficiency reaches 98%.





Recommendations for the choice of an efficient boilerto Determine which gas boiler is the most economical, really easy. This condensing units, mentioned above. Another thing is that they cost a lot of money, like all high-tech devices. The availability of such an acquisition for many homeowners remains in question, so we allow ourselves to give General recommendations for a successful selection of the heating installation. Firstly, let's dispel one myth.

Sales representatives of some brands, offering condensing heat generators for heating, use the same marketing ploy. Talking about the process of selection of heat from water vapor, they declare the value of the efficiency of the unit at 109%. The rationale is: the efficiency standard of the boiler is 98%, and due to condensation it added another 11%. A simple calculation gives the result to as much as 109%. This demonstrates the picture:





In fact, the efficiency can never be more than 100%, this is the basic laws of physics. Because the fuel burns, allocates a certain amount of heat energy. A small share is spent on evaporation of water, and the pot just brings it back, not allowing them to fly into the pipe. Ideally, efficiency would be equal to 100%, but no more. In practice, even the most expensive and efficient gas boilers for private homes will be able to give 98% power.

When choosing a heat source is to require the technical passport and to pay attention to:

• the value of the efficiency indicated in the documentation;
• the temperature of leaving flue gases for different modes of operation of the unit;
• the design of the heat exchanger. The more moves inside it will make the fuel combustion products, the better;
• the quality and thickness of the insulating layer of the water jacket.

If because of the nature of the operation you need a simple non-volatile unit, you need to understand that its efficiency cannot be as high as that of the condensing boiler. You will have to rely on the efficiency of the heating system and good insulation of the building. And to further take heat from the flue gases, it is possible to buy the economizer. It is installed into the chimney and heats the water that goes on the return pipe.

ConclusionModern gas boilers are fairly efficient devices, in terms of efficiency they lose only electric heat generators. But the degree of efficiency of the aggregates is very dependent on the presence of high-tech elements, and hence of the value of the product as a whole. The same condensing boilers as economical as the road. At the same time, basic budget unit can completely satisfy you, besides it is able to work on both natural and liquefied gas. published

 



P. S. And remember, only by changing their consumption — together we change the world! ©

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Source: cotlix.com/kak-vybrat-samyj-ekonomichnyj-gazovyj-kotel

Source: cotlix.com/kak-vybrat-samyj-ekonomichnyj-gazovyj-kotel