Effect of draught conditions and ignition technique on combustion performance of firewood roomheaters

Reichert, G.; Hartmann, Hans; Haslinger, Walter; Oehler, H.; Mack, Robert; Schmidl, Christoph; Schön, Claudia; Schwabl, M.; Stressler, Harald; Sturmlechner, Rita; Hochenauer, Christoph

doi:10.1016/j.renene.2016.12.017

Cited by 14 publications

(19 citation statements)

References 17 publications

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“…According to the test standard for room heaters with solid fuels DIN EN 13240, a constant chimney draught of 12 ± 2 Pa is necessary to ensure trouble‐free and safe operation 20. If the standard draught is exceeded or undershot, the volume flow of the flue gas and the combustion air supply change, which influences the combustion 17, 19, 21–23. Studies have shown that the chimney draught under real conditions is between 14 and 30 Pa 14, 17, 24, 25, thus, exceeding the reference value of 12 Pa.…”

Section: Introduction and State Of The Artmentioning

confidence: 99%

“…However, literature comes to different conclusions concerning the impact of the air supply on the combustion temperature. There are studies that show a cooling effect of the higher airflow 29 another study reports a constant rise of temperature with increasing draughts 22.…”

Section: Introduction and State Of The Artmentioning

confidence: 99%

“…This growth is caused by particles adhering to each other in collisions (coagulation) or by smaller particles melting to larger ones (coalescence) 45. In literature it is reported that the quantity of dust emissions does not change depending on draught conditions 22, 23. However, it is reported that the particle number distribution 46 and the composition of the dust 23 changes related to excess air.…”

Section: Introduction and State Of The Artmentioning

confidence: 99%

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Impact of Chimney‐draught Conditions on Combustion and Emission Behavior of a Wood‐burning Stove

Endriss

Grammer

Russ

et al. 2020

Chemie Ingenieur Technik

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Pollutants from combustion in wood‐burning stoves are influenced by many factors, including the exhaust gas system. This is responsible for the air supply due to the draught generated. Contrary to results reported in literature the experiments in this study show no effect on temperature related to increasing air supply and a total dust decreasing at higher draughts. The results also show no significant impact of the draught on gaseous emissions (CO/OGC/NOx). The most significant loss was determined at thermal efficiency, which lost up to 13 % absolute with increasing draught.

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Section: Introduction and State Of The Artmentioning

confidence: 99%

Section: Introduction and State Of The Artmentioning

confidence: 99%

Section: Introduction and State Of The Artmentioning

confidence: 99%

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Impact of Chimney‐draught Conditions on Combustion and Emission Behavior of a Wood‐burning Stove

Endriss

Grammer

Russ

et al. 2020

Chemie Ingenieur Technik

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“…Emission rates and efficiencies of residential wood heating appliances are affected by a variety of end-user controlled fuel and operational parameters, including the physical and chemical properties of the wood, ignition method, adjustment of the combustion air damper, fuel amount per batch, heat setting and method and frequency of adding new fuel (Brandelet et al 2018;Fachinger et al 2017;Reichert et al 2017Reichert et al , 2016Shen et al 2013;Vicente et al 2015aVicente et al , 2015b. The usage patterns of OWHHs and IWSs are very different, due to the differences in their size, function and technical design.…”

Section: Introductionmentioning

confidence: 99%

Investigation of real-life operating patterns of wood-burning appliances using stack temperature data

Ahmadi¹,

Minot

Allen³

et al. 2020

Journal of the Air & Waste Management Association

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A study was undertaken to identify patterns of consumer use of outdoor wood boilers or outdoor wood furnaces (technically referred to as outdoor wood-fired hydronic heaters (OWHHs)) and indoor wood stoves (IWSs) to inform the development of performance testing protocols that reflect real-life operating conditions. These devices are manually fed, and their usage protocols are a function of a number of variables, including user habits, household characteristics, and environmental factors. In this study, researchers logged the stack wall temperatures of 4 OWHH and 20 IWS units in the states of New York and Washington over two heating seasons. Stack wall temperature is an indicator of changes in combustion modes. Two algorithms were developed to identify usage modes and cold and warm start refueling events from the stack wall temperature time series. A linear correlation analysis was conducted to evaluate the effect of heat demand on usage patterns. The results and methods presented here will inform the cataloging of typical operational patterns of OWHHs and IWSs as a step in the development of performance testing procedures that represent actual in-home usage patterns.Implications: Current US regulatory programs for residential wood heating use a certification program to assess emissions and efficiency performance. Testing under this program uses a test that burns 100% of a single, standardized wood fuel charge to assess performance at different steady-state load conditions. This study assessed in-field operational patterns to determine if the current certification approach accurately characterized typical homeowner use patterns.

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“…This makes the measurements more reproducible, but the conditions of the type testing deviate from the real operating conditions at the user [1]. Similarly, the emissions vary with changing draft conditions; the thermal efficiency decreases with increasing draft [4]. Thus, the real emissions could deviate significantly from the type testing results.…”

Section: Introductionmentioning

confidence: 99%

Simulation of the natural draft for test bench measurements

Krüger

Lenz

Ulbricht

2019

Biomass Conv. Bioref.

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Single room heaters are usually type tested with constant draft and are allowed under these conditions. However, the mode of operation of the user's firing usually deviates significantly from these conditions of approval, since these are operated in most cases by natural draft and not by constant draft. Since the repeatability of natural draft is hardly given due to the changing environmental conditions, a simulation has been developed, which can simulate the natural draft with high accuracy. Thus, it is basically possible to replicate the natural draft with constant environmental conditions and to use it for test bench measurements. It is a purely physical simulation that does not require any calibration parameters. Chimney geometry and environmental boundary conditions, such as the outside temperature, can be chosen freely. In addition, the cost of the necessary hardware is very low, since the system only needs cheap thermocouples, pressure sensors, and a small USB module for data acquisition.

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Effect of draught conditions and ignition technique on combustion performance of firewood roomheaters

Cited by 14 publications

References 17 publications

Impact of Chimney‐draught Conditions on Combustion and Emission Behavior of a Wood‐burning Stove

Impact of Chimney‐draught Conditions on Combustion and Emission Behavior of a Wood‐burning Stove

Investigation of real-life operating patterns of wood-burning appliances using stack temperature data

Simulation of the natural draft for test bench measurements

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