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One of the most important parameters that indicates the quality of any device is its efficiency. If we talk about the efficiency of the combustion equipment we use for heating homes, it is obvious that with increasing efficiency, fuel consumption will decrease, and thus also fuel costs. Similarly, we can state that with decreasing efficiency, we have to add more fuel to the combustion device in order to get the same heat.
The average user has a minimal idea of how efficiently his combustion equipment works, i.e. stove, fireplace, fireplace insert, stove or boiler. Did you know that if you heat in an open fireplace, approx. 90% of the heat is not used for heating, but simply put, "goes up the chimney"? Yes, an open fireplace is only about 10% efficient. Do you want to know how efficiently you heat your home? The aim of this article is to offer a simple procedure that will enable an approximate determination of the efficiency of your combustion equipment in domestic conditions.
The efficiency of the combustion device expresses the degree of efficiency of using the energy contained in the fuel for heating purposes. Efficiency can be determined either by direct or indirect methods.
The direct method of determining efficiency is based on the consideration that the efficiency of a combustion device for heating expresses the ratio between the energy used (that is, the amount of energy - heat - that we obtained by burning the fuel and used for heating) and the supplied energy (that is, the amount of energy in the fuel - calorific value and fuel consumption). Direct determination is an accurate method, which, however, is difficult to use for ordinary users due to the problematic nature of "home" determination of the performance value.
The indirect method of determining efficiency is based on the following consideration: an ideal machine or device works with an efficiency of 100%, but in reality no real device is Perpetum mobile and its efficiency is therefore always less than 100%. The actual efficiency is lower by the various losses, so we can say that the efficiency is equal to 100% minus the sum of the individual losses in %. If we determine the main losses, we can relatively reliably determine the efficiency even in domestic conditions.
In a simplified way, we can talk about the following losses for small combustion devices:
The size of the chimney loss is most influenced by two parameters:
Source and full article: www.vytapeni.tzb-info.cz