In order to determine the sensitivity of influencing factors on NOx emission in gas-fired heating and hot water combi-boilers,the orthogonal method was adopted in this paper.Five predominant factors affecting the form...In order to determine the sensitivity of influencing factors on NOx emission in gas-fired heating and hot water combi-boilers,the orthogonal method was adopted in this paper.Five predominant factors affecting the formation of NOx and four levels were selected to be analyzed,including the diameter of flue restrictor,power of fan,ejection distance of nozzle,aperture of nozzle and relative humidity of air.The test plan was designed by employing L16(45)orthogonal array,and 16 groups of experiments were conducted.The test results were analyzed with range analysis and variance analysis.The results indicated that the power of fan has the greatest influence on the formation of NOx of the gas-fired combi-boilers,followed by the diameter of flue restrictor and the relative humidity of air,while the ejection distance of nozzle and aperture of nozzle have little effect on the formation of NOx.In addition,with the selected optimal combination of five factors,a minimum NOx volume fraction is obtained,which confirms the superiority of the orthogonal test.The research finding has a certain guiding significance for the reduction of NOx formation of gas-fired heating and hot water combi-boiler.展开更多
Preliminary investigation of the assigned task shows that the energy efficiency of residential houses is conditioned by the quantity of energy,consumed by all internal energy providing systems that serve for creation ...Preliminary investigation of the assigned task shows that the energy efficiency of residential houses is conditioned by the quantity of energy,consumed by all internal energy providing systems that serve for creation of comfort microclimate in all rooms of the building.The energy consuming systems of residential houses are:heating,ventilation,air conditioning,domestic hot water providing,tap water supplying systems and other life supporting facilities.If the listed systems consume possibly least quantity of energy or so cold zero net energy,the building can be qualified as energy efficient.The authors of this article try to give right answers how to provide the best,cheapest and ecologically safe solutions of assigned tasks.One of the radical solutions of the problem is the development and use of fossil fuel non-consuming installations of energy production.To overcome of mentioned problems the authors developed new type of thermal and electrical energy generating high efficiency local and central systems.For this reason,the authors of this study decided to develop new generation of heating,ventilation and domestic hot water supplying high efficiency integrated systems.展开更多
基金funded by the Key Project in the Tianjin Science and Technology Pillar Program under grant number 19YFZCCG00550。
文摘In order to determine the sensitivity of influencing factors on NOx emission in gas-fired heating and hot water combi-boilers,the orthogonal method was adopted in this paper.Five predominant factors affecting the formation of NOx and four levels were selected to be analyzed,including the diameter of flue restrictor,power of fan,ejection distance of nozzle,aperture of nozzle and relative humidity of air.The test plan was designed by employing L16(45)orthogonal array,and 16 groups of experiments were conducted.The test results were analyzed with range analysis and variance analysis.The results indicated that the power of fan has the greatest influence on the formation of NOx of the gas-fired combi-boilers,followed by the diameter of flue restrictor and the relative humidity of air,while the ejection distance of nozzle and aperture of nozzle have little effect on the formation of NOx.In addition,with the selected optimal combination of five factors,a minimum NOx volume fraction is obtained,which confirms the superiority of the orthogonal test.The research finding has a certain guiding significance for the reduction of NOx formation of gas-fired heating and hot water combi-boiler.
文摘Preliminary investigation of the assigned task shows that the energy efficiency of residential houses is conditioned by the quantity of energy,consumed by all internal energy providing systems that serve for creation of comfort microclimate in all rooms of the building.The energy consuming systems of residential houses are:heating,ventilation,air conditioning,domestic hot water providing,tap water supplying systems and other life supporting facilities.If the listed systems consume possibly least quantity of energy or so cold zero net energy,the building can be qualified as energy efficient.The authors of this article try to give right answers how to provide the best,cheapest and ecologically safe solutions of assigned tasks.One of the radical solutions of the problem is the development and use of fossil fuel non-consuming installations of energy production.To overcome of mentioned problems the authors developed new type of thermal and electrical energy generating high efficiency local and central systems.For this reason,the authors of this study decided to develop new generation of heating,ventilation and domestic hot water supplying high efficiency integrated systems.