The Design of the Pre-Heater of Gas-Operated Hot-Water Heater


Article Preview

This study developed the pre-heating device which heats the water by using the exhaust gases from gas-operated hot-water heater. Thus the temperature of water is raised at an exit of the pre-heating device. The pre-heated water is then transport to the gas-operated hot-water heater to increase the water temperature which is used for showers. Thus, the thermal performance is enhanced with the pre-heating device. The overall performance of the absorption heater system is analyzed by finite element analysis. The different types of pre-heating devices are simulated for the thermal performance. Other important considerations for producing the pre-heating devices are the bending-tube technology and manufacturing cost. The appropriated design of pre-heating device is selected for producing. Thus the performance and testing of pre-heating devices will be carried out.



Edited by:

Amanda Wu




T. S. Yang et al., "The Design of the Pre-Heater of Gas-Operated Hot-Water Heater", Applied Mechanics and Materials, Vol. 232, pp. 752-756, 2012

Online since:

November 2012




[1] Y.H. Lee, Analysis of absorption refrigeration cycles to utilize treated sewage, Korean Journal of Air-Conditioning and Refrigeration Engineering 8 (1996) p.288–298.

[2] N.C. Baek, A study on the dynamic performance of a solar absorption cooling system, Solar Energy 18 (1998) p.81–87.

[3] H. Kojima, A. Akisawa, T. Kashiwagi, Characteristics of two-stage absorption heat pump cycle driven by waste heat from gas engine, Transactions of the JSRAE 14 (1998) p.113–124.

[4] T.T. Chow, G. Pei , K.F. Fong , Z. Lin , A.L.S. Chan , M. He, Modeling and application of direct-expansion solar-assisted heat pump for water heating in subtropical Hong Kong, Applied Energy 87 (2010) pp.643-649.


[5] C.N. Lin, C.C. Wang, Y.P. Kuo, The heat and fluid flow analysis for water heater, Thermal Science 15 (2011) p. S81-S86.