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[1] Qiu Bu, Zhang Xiaosong, Dou Liliang, et al. Simulation study on combustion systemof tankless gas water heater [J]. Journal of Southeast University (English Edition), 2010, 26 (2): 187-191. [doi:10.3969/j.issn.1003-7985.2010.02.009]
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Simulation study on combustion systemof tankless gas water heater()
快速式燃气热水器燃烧系统模拟
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Journal of Southeast University (English Edition)[ISSN:1003-7985/CN:32-1325/N]

Volumn:
26
Issue:
2010 2
Page:
187-191
Research Field:
Energy and Power Engineering
Publishing date:
2010-06-30

Info

Title:
Simulation study on combustion systemof tankless gas water heater
快速式燃气热水器燃烧系统模拟
Author(s):
Qiu Bu1;  2;  Zhang Xiaosong1;  Dou Liliang2
1School of Energy and Environment, Southeast University, Nanjing 210096, China
2A.O.Smith(China)Water Heater Co., Ltd., Nanjing 210038, China
邱步1;  2;  张小松1;  窦礼亮2
1东南大学能源与环境学院, 南京 210096; 2 A.O.史密斯(中国)热水器有限公司, 南京 210038
Keywords:
tankless gas water heater;  combustion system;  CO emission;  computational fluid dynamics(CFD);  static pressure
快速式燃气热水器;  燃烧系统;  CO排放;  计算流体动力学;  静压
PACS:
TK16
DOI:
10.3969/j.issn.1003-7985.2010.02.009
Abstract:
This paper simulates the combustion system of a regular tankless gas water heater under different static pressure conditions.The simulation results are in accordance with the test results.It proves that the used physical and mathematical models are reasonable.The results show that the flame height and the excess air ratios depend on the system pressure drop but not on the absolute pressure at the combustion chamber.The pressure drop and the amount of combustion air have an inverse relationship with CO generation, and they also impact on the temperature and velocity fields.To reduce CO emission, a stronger fan is needed to provide extra pressure head to ensure that enough combustion air is introduced into the system.This study provides a useful research tool to develop products through computational fluid dynamic analysis and laboratory testing.
模拟了一种常规快速式燃气热水器的燃烧系统, 研究了不同压力状况下的燃烧工况.得到的数值模拟结果与实验获得的数据吻合得较好, 证明了所用物理模型和数学模型的合理性.结果显示, 火焰高度和过剩空气系数依赖于系统出口和入口的静压差, 而与燃烧室内的绝对压力无关.该静压差和系统中用于燃烧的空气量显著影响CO的生成, 与CO的生成量呈反比关系, 并同时影响燃烧区域内的温度场和速度场.为降低CO排放水平, 必须增加进入燃烧系统的空气量, 因此需要增加风机输出功率以提供足够的空气压头.该研究为设计快速式燃气热水器提供了一种行之有效的方法.

References:

[1] Dieckmann J, McKenney K, Brodric J.Gas tankless water heaters[J].ASHRAE Journal, 2009, 51(12):117-118.
[2] Rinnai Corporation.Gas burner:Japan H02-100018U [P].1990. [3] Noritz Corporation.Impact forging forming metal combustor and method for producing the same impact forging metal combustion device:China, 03155304.4A[P].2005.(in Chinese)
[4] Patankar S V.Numerical heat transfer and fluid flow [M].Washington DC:Hemisphere Publishing Corp, 1980:4-5.
[5] Huang S, Peng S N, Luo X C, et al.Numerical simulation of combustion and pollutants emission about instantaneous gas water heater [J].Energy Engineering, 2007(1):48-52.(in Chinese)
[6] Zhang J.Gas water heater status of the different combustion laboratory tests and analysis [J].Shanghai Measurement and Testing, 2008(3):41-43.(in Chinese)
[7] Yang J.Numerical analysis of the fan instantaneous gas water heat’ chamber [D].Wuhan:School of Environmental Science and Engineering, Huazhong University of Science and Technology, 2006.(in Chinese)
[8] Law C K.Combustion physics[M].New York:Cambridge University Press, 2006:265-266.

Memo

Memo:
Biographies: Qiu Bu(1972—), male, graduate;Zhang Xiaosong(corresponding author), male, doctor, professor, rachpe@seu.edu.cn.
Citation: Qiu Bu, Zhang Xiaosong, Dou Liliang.Simulation study on combustion system of tankless gas water heater[J].Journal of Southeast University(English Edition), 2010, 26(2):187-191.
Last Update: 2010-06-20