A Study of the Characteristics of Heat Transfer for an Ammonia-Water Bubble Mode Absorber in Absorption Heat Pump Systems

Jae-Cheol Lee; Ki-Bong Lee; Byung-Hee Chun; Chan Ho Lee; Jong Joo Ha; Sung Hyun Kim

Korean Journal of Chemical Engineering, Vol.19, No.4, 552-556, July, 2002

Jae-Cheol Lee, Ki-Bong Lee , Byung-Hee Chun, Chan Ho Lee, Jong Joo Ha, and Sung Hyun Kim^†

Department of Chemical Engineering, Korea University, Seoul 136-701, Korea

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An absorber is a major component in absorption refrigeration systems and its performance greatly affects the overall system performance. In this study, experimental analyses of the characteristics of heat transfer for removal of absorption heat in an ammonia-water bubble mode absorber were performed. The heat transfer coefficient was estimated as a function of the input gas flow rate, solution flow rate, temperature, concentration, absorber diameter and height, and input flow direction. The increase of gas and solution flow rate affects positively in heat transfer. However, the increase of solution temperature and concentration affects negatively. Moreover, under the same Reynolds number, countercurrent flow is superior to cocurrent flow in heat transfer performance. In addition, from these experimental data, empirical correlations that can explain easily the characteristics of heat transfer are derived.

Keywords:Absorption Process;Absorption Heat Pump;Heat Transfer;Bubble Mode;Ammonia-Water

[References]

Christensen RN, Kang YT, Garimella S, Preideman D, "Generator Absorber Heat Exchanger (GAX) Cycle Modeling, Component Design and Tests," Final Report to LG Electronics, Contract Number: 862805-01/062805 (1996)
Kang YT, Akisawa A, Kashiwagi T, Int. J. Ref., 23, 430 (2000)
Kang YT, Akisawa A, Kashiwagi T, Int. J. Ref., 22, 250 (1999)
Lee KB, Chun BH, Lee JC, Park CJ, Kim SH, Korean J. Chem. Eng., 19(1), 87 (2002)
Lee KB, Chun BH, Lee JC, Park CJ, Kim SH, "Comparison of Heat and Mass Transfer of Falling Film and Bubble Mode in Ammonia-water," Experimental Heat Transfer, In Press (2002)
McCabe WL, Smith JC, Harriott P, "Unit Operations of Chemical Engineering," McGraw-Hill, Singapore, 5th ed., 115 (1993)
Perry RH, Green DW, "Perry's Chemical Engineers' Handbook," 6th ed., McGraw-Hill International Editions, Japan (1984)
Reid RC, Prausnitz JM, Poling BE, "The Properties of Gases & Liquids," McGraw-Hill, Singapore (1986)
Sujatha KS, Mani A, SrinivasaMurthy S, Heat Mass Transf., 32, 255 (1997)
Sujatha KS, Mani A, SrinivasaMurthy S, Int. Community Heat Mass Transf., 26(7), 975 (1999)
Sung WM, Huh DG, Ryu BJ, Lee HS, Korean J. Chem. Eng., 17(3), 344 (2000)
Tsutsumi A, Chen W, Kim YH, Korean J. Chem. Eng., 16(6), 709 (1999)
Yamashita F, Korean J. Chem. Eng., 16(6), 789 (1999)

[Related Articles]

[1] Christensen RN, Kang YT, Garimella S, Preideman D, "Generator Absorber Heat Exchanger (GAX) Cycle Modeling, Component Design and Tests," Final Report to LG Electronics, Contract Number: 862805-01/062805 (1996)

[2] Kang YT, Akisawa A, Kashiwagi T, Int. J. Ref., 23, 430 (2000)

[3] Kang YT, Akisawa A, Kashiwagi T, Int. J. Ref., 22, 250 (1999)

[4] Lee KB, Chun BH, Lee JC, Park CJ, Kim SH, Korean J. Chem. Eng., 19(1), 87 (2002)

[5] Lee KB, Chun BH, Lee JC, Park CJ, Kim SH, "Comparison of Heat and Mass Transfer of Falling Film and Bubble Mode in Ammonia-water," Experimental Heat Transfer, In Press (2002)

[6] McCabe WL, Smith JC, Harriott P, "Unit Operations of Chemical Engineering," McGraw-Hill, Singapore, 5th ed., 115 (1993)

[7] Perry RH, Green DW, "Perry's Chemical Engineers' Handbook," 6th ed., McGraw-Hill International Editions, Japan (1984)

[8] Reid RC, Prausnitz JM, Poling BE, "The Properties of Gases & Liquids," McGraw-Hill, Singapore (1986)

[9] Sujatha KS, Mani A, SrinivasaMurthy S, Heat Mass Transf., 32, 255 (1997)

[10] Sujatha KS, Mani A, SrinivasaMurthy S, Int. Community Heat Mass Transf., 26(7), 975 (1999)

[11] Sung WM, Huh DG, Ryu BJ, Lee HS, Korean J. Chem. Eng., 17(3), 344 (2000)

[12] Tsutsumi A, Chen W, Kim YH, Korean J. Chem. Eng., 16(6), 709 (1999)

[13] Yamashita F, Korean J. Chem. Eng., 16(6), 789 (1999)