[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()

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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

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

Keywords:

tankless gas water heater;  combustion system;  CO emission;  computational fluid dynamics(CFD);  static pressure

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.

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.

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