Analyzing the environmental effects of conventional and condensing combi boilers using natural gas

Abstract

Generally, space heating and hot water providing are done by combi boilers. Different types of combi boilers are available. In therecent years condensing combi boilers have been introduced that have high energy efficiency in comparison with conventionaltypes. In the condensing type combi boilers, an additional heat exchanger is utilized to recover energy form flue gas. In this studythe effects of combi boiler type on pollutant gas emissions have been experimentally analyzed. In this regard three different combiboiler including conventional, condensing and full condensing type combi boilers have been selected in the experiments. Inaddition, the experiments have been done in different temperatures to investigate the temperature effect. The obtained resultsshowed that in all temperatures using condensing and full condensing combi boilers reduced CO2, NO and NOx gas emissionsconsiderably. Also, by analyzing combi boilers emissions in different working temperatures, it can be said that in low temperaturesCO2 emission reduction in condensing combi is higher than its reduction in high temperatures in comparison with conventionalone.