[논문]Thermal Performance of a Finned-tube Heat Exchanger used in Condensing Gas Boiler

Kang, Hie-Chan; Lim, Bok-Bin; Lee, Jung-Man; Kim, Moo-Han

[해외논문] Thermal Performance of a Finned-tube Heat Exchanger used in Condensing Gas Boiler 원문보기

International journal of air-conditioning and refrigeration, v.17 no.2, 2009년, pp.61 - 67

Kang, Hie-Chan (School of Mechanical & Automotive Eng., Kunsan National University) , Lim, Bok-Bin (Department of Mech. Eng., Graduate School of Kunsan National University) , Lee, Jung-Man (Department of Mech. Eng., Graduate School of Kunsan National University) , Kim, Moo-Han (Department of Mech. Eng., POSTECH)

Abstract ▼ AI-Helper

In the present study, an experiment was conducted to investigate the heat and mass transfer performance of heat exchangers used in the condensing gas boiler. Two types of spiral circular fin-tube heat exchangers and a plain tube were tested in the flue gas of propane and dry air. Heat and mass transfer coefficients were measured and compared with the previous correlations. The experimental data for the sensible heat transfer of the plain tube reasonably agreed with the previous correlations for dry air and flue gas. However, the mass transfer coefficient of the plain tube was greater than the previous correlations. The pH, $NO_x$, and $SO_x$ data of condensate were provided.

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가설 설정

(3) The fin-tube heat exchangers having the extended surface showed lower mass transfer coefficients than the plain tube.

제안 방법

This gave some error in the measurement of sensible and latent heat transfer. The dry air test was conducted to measure the sensible heat transfer only in the other wind tunnel. The properties of the collected condensate were tested by the probe-type pH meter and ion chromatography (Bonex Co.
The dry air test was conducted to measure the sensible heat transfer only in the other wind tunnel. The properties of the collected condensate were tested by the probe-type pH meter and ion chromatography (Bonex Co.) to measure the NOX and SOX values.
An experiment was conducted to provide quantitative data for the condensing gas boiler application. Two types of fin-tube heat exchangers and a plain tube were tested for the flue gas of propane and dry air.
Two types of fin-tube heat exchangers and a plain tube were tested for the flue gas of propane and dry air. Heat and mass transfer coefficients and the pH, NOS and SOX concentration of the condensate were measured. We obtained the following conclusions.
The wall temperature was calculated by using the relation among the coolant temperature, heat transfer rate, and the thermal resistances of the coolant and the tube wall. It is difficult to find reliable correlations for the temperature of interface, especially the fin-tube geometry.

대상 데이터

1 is a schematic diagram of the experimental apparatus used in the fluee gas test. The apparatus consisted of a gas boiler, a secondary heat exchanger, a test section, a constant water bath, and measuring devices. The gas boiler (18.
The apparatus consisted of a gas boiler, a secondary heat exchanger, a test section, a constant water bath, and measuring devices. The gas boiler (18.6 kW) burned propane gas (C₃H₈ 98.9, C₃H₄ 0.79, C4H10 0.31 vol%) and produced 가ue gas. The flue gas was cooled to approximately 170 ℃ by the watercooled heat exchanger.

참고문헌 (9)

Taniguchi, H., Kudo, K., Huang, Q. and Fujii, A., 1987, Heat and Mass Transfer from Air with High Water Vapor Content (Latent Heat Recovery from Flue Gas), (in Japanese), Trans. of JSME (B), Vol. 53, No. 495, pp. 3377-3382

상세보기
Kanzaka, M., Soda, M., Yokoo, K., Iwabuchi, M. and Osada, I., 1992, Recovery of Water from Flue Gas (Heat and Mass Transfer on the Spirally Finned Tube), (in Japanese), Trans. of JSME (B), Vol. 58, No. 545, pp. 248-253

상세보기
Osakabe, M. Yagi, K., Itoh, T., Ohmasa, K., 2003, Condensation Heat Transfer on Tubes in Actual Flue Gas (Parametric study for condensation behavior), Heat transfer, Asian research, Vol. 32, No 2, pp. 152-166

상세보기
ASHRAE, 1997, ASHRAE Hand Book Fundamentals, USA, pp. 6.1-6.17
Reid, R. C., Prausnitz, J. M. and Poling, B. E., 1987, The Properties of Gases and Liquids, McGraw-Hill, New York, USA, pp. 404-410
Zukauskas, A., 1972, Advanced in Heat Transfer, Vol. 8, Academic press, New York, pp. 93-100
Mills, A. F., Tan, C. and Chung, D. K., 1974, Experimental Study of Condensation from Steam-air Mixtures Flowing over a Horizontal Tube: Overall Condensation Rates, Proc. 5th Int. Heat Transfer Conf., Vol. 5, pp. 20-30
Fujii, T., Honda, H., Oda, K. and Kawano, S., 1981, Forced Convective Condensation of Low Pressure Steam-air Mixture on a Horizontal Tube, (in Japanese), Trans. JSME (B), Vol. 47, No. 417, pp. 836-843

상세보기
Jeong, D., W., Lee, S. Y. and Lee, H. J., 1999, Review of Mass Transfer Correlations on Laminar Film Condensation of Vapor/Gas Mixture with High Concentration of Non-condensable, Proc. of KSME Fall Meeting, Vol. KSME 99F260, pp. 370-377

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