Abstract
The article is focused on increasing the efficiency of fireplace inserts by means of a device used to preheat the combustion air with a part of the heat from the flue gases. The proposed device is a heat pipe with a closed loop, where its evaporator takes heat from the flue gas in front of the chimney orifice and transfers it via saturated steam to the condenser. This heats the combustion air and thus increases the thermal efficiency of a small heat source.
Highlights
Fireplace inserts as a heat source produce heat output by burning fuel
The evaporating part of the heat pipe is located in front of the chimney orifice, where it removes heat from the flue gas, which is transferred in the form of saturated steam through a steam pipe to a condenser located in the combustion air supply channel
The cooperation between the condenser and the evaporator must be ensured in the loop heat pipe, for this reason we have reduced the flue gas temperature from the original 200 °C to 40 °C in the mathematical model in Excel in order to find the cooperation point
Summary
Fireplace inserts as a heat source produce heat output by burning fuel. In the form of flue gases, a large amount of waste heat is released through the chimney into the air, which reduces the efficiency of the fireplace insert itself [1]. It is possible to remove part of the heat from the flue gas, which can be used for heating water by various methods [2] When using these applications, it can be a problem to ensure the safe operation of the fireplace insert in the system and it is necessary to include safety elements such as safety valves, expansion vessels, etc. It can be a problem to ensure the safe operation of the fireplace insert in the system and it is necessary to include safety elements such as safety valves, expansion vessels, etc Another disadvantage is the need for storage tanks, which take up space and increase investment costs. The most advantageous solution seems to be the use of waste heat directly in the combustion processes
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