Design of an experimental device for preheating combustion air

Lucia Martvoňová,Alexander Backa,Mária Polačiková,Juraj Drga,L Richter,M Volf,M Vackova,M Pelikan

doi:10.1051/matecconf/202134500021

Abstract

The principle of the proposed device is to use part of the waste heat, which otherwise leaves through the chimney unused into the air, to preheat the combustion air. reducing chimney losses and preheating the combustion air will increase the efficiency of the heat source. the device is actually a gravity loop heat pipe with an evaporating part located behind the furnace and a condensing part in the combustion air supply duct. Heat transfer is realized by means of phase transformation of the working medium in the proposed device.

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 mouth, 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
Increasing the efficiency of heat sources by improving the combustion process is slowly reaching its limits, so we must focus on other possible solutions

Summary

Introduction

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 water heating [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

Loop Thermosyphon

Equipment to increase the efficiency of the fireplace insert

Condenser

Evaporator and condenser cooperation The principle of the loop thermosyphon

Findings

Conclusion