The maximum thermal efficiency of the PRB in the power range of 1 3 kW is 75.1%, while the respective value of the conventional burner (CB) is 65%.
The relative impact of thermal load on temperature, emissions and burner radiation efficiency with respect to equivalence ratio was also studied.
The changes of temperature in the porous medium combustion chamber have been recorded, and the pressure losses in the burner, thermal efficiency of the burner, and the concentration of NO polluting gasses have been measured.
Experiments confirm these trends by showing an improvement in burner thermal efficiency of 2.5% for LPG with the modified design, and 10% for PNG with the optimal loading height, demonstrating that the CFD modeling approach developed in the present work is a useful tool to study domestic burners.
The presented achievements include low-NOx burners, improved efficiency, heat exchangers, waste heat recovery systems, newly developed equipment for wet scrubbing, dioxin filters and systems for the treatment of sewage sludge.
With the use of the newly designed burner, the thermal efficiency of the gasifier cookstove was found to improve substantially.
The opposing effects of CO and H2 addition on CH4/air combustion, aside the influence of CO2 dilution, were assessed on burner operation and radiation efficiency.
But in its report, the Environmental Defense Fund said that cleaner fuels improve the efficiency of burners and reduce operating costs, compensating for the up-front costs and the higher price of No. 2 oil.
This work is part of a research project focused on improving the efficiency of burners.
Further improvement in thermal efficiency of the burner can be realized by combining the PRRB with the swirling central flame ring burner (SB), i.e. the PRRB(SB), yielding a maximum thermal efficiency of about 60% and, thus, energy saving of about 50% in average over the operating range.
